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OpenRISC: Boot code 

Architecture code and early setup routines for booting Linux.
Signed-off-by: default avatarJonas Bonn <jonas@southpole.se>
Reviewed-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 82ed223c
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/*
* OpenRISC entry.S
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* Modifications for the OpenRISC architecture:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2005 Gyorgy Jeney <nog@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/linkage.h>
#include <asm/processor.h>
#include <asm/unistd.h>
#include <asm/thread_info.h>
#include <asm/errno.h>
#include <asm/spr_defs.h>
#include <asm/page.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/asm-offsets.h>
#define DISABLE_INTERRUPTS(t1,t2) \
l.mfspr t2,r0,SPR_SR ;\
l.movhi t1,hi(~(SPR_SR_IEE|SPR_SR_TEE)) ;\
l.ori t1,t1,lo(~(SPR_SR_IEE|SPR_SR_TEE)) ;\
l.and t2,t2,t1 ;\
l.mtspr r0,t2,SPR_SR
#define ENABLE_INTERRUPTS(t1) \
l.mfspr t1,r0,SPR_SR ;\
l.ori t1,t1,lo(SPR_SR_IEE|SPR_SR_TEE) ;\
l.mtspr r0,t1,SPR_SR
/* =========================================================[ macros ]=== */
/*
* We need to disable interrupts at beginning of RESTORE_ALL
* since interrupt might come in after we've loaded EPC return address
* and overwrite EPC with address somewhere in RESTORE_ALL
* which is of course wrong!
*/
#define RESTORE_ALL \
DISABLE_INTERRUPTS(r3,r4) ;\
l.lwz r3,PT_PC(r1) ;\
l.mtspr r0,r3,SPR_EPCR_BASE ;\
l.lwz r3,PT_SR(r1) ;\
l.mtspr r0,r3,SPR_ESR_BASE ;\
l.lwz r2,PT_GPR2(r1) ;\
l.lwz r3,PT_GPR3(r1) ;\
l.lwz r4,PT_GPR4(r1) ;\
l.lwz r5,PT_GPR5(r1) ;\
l.lwz r6,PT_GPR6(r1) ;\
l.lwz r7,PT_GPR7(r1) ;\
l.lwz r8,PT_GPR8(r1) ;\
l.lwz r9,PT_GPR9(r1) ;\
l.lwz r10,PT_GPR10(r1) ;\
l.lwz r11,PT_GPR11(r1) ;\
l.lwz r12,PT_GPR12(r1) ;\
l.lwz r13,PT_GPR13(r1) ;\
l.lwz r14,PT_GPR14(r1) ;\
l.lwz r15,PT_GPR15(r1) ;\
l.lwz r16,PT_GPR16(r1) ;\
l.lwz r17,PT_GPR17(r1) ;\
l.lwz r18,PT_GPR18(r1) ;\
l.lwz r19,PT_GPR19(r1) ;\
l.lwz r20,PT_GPR20(r1) ;\
l.lwz r21,PT_GPR21(r1) ;\
l.lwz r22,PT_GPR22(r1) ;\
l.lwz r23,PT_GPR23(r1) ;\
l.lwz r24,PT_GPR24(r1) ;\
l.lwz r25,PT_GPR25(r1) ;\
l.lwz r26,PT_GPR26(r1) ;\
l.lwz r27,PT_GPR27(r1) ;\
l.lwz r28,PT_GPR28(r1) ;\
l.lwz r29,PT_GPR29(r1) ;\
l.lwz r30,PT_GPR30(r1) ;\
l.lwz r31,PT_GPR31(r1) ;\
l.lwz r1,PT_SP(r1) ;\
l.rfe
#define EXCEPTION_ENTRY(handler) \
.global handler ;\
handler: ;\
/* r1, EPCR, ESR a already saved */ ;\
l.sw PT_GPR2(r1),r2 ;\
l.sw PT_GPR3(r1),r3 ;\
l.sw PT_ORIG_GPR11(r1),r11 ;\
/* r4 already save */ ;\
l.sw PT_GPR5(r1),r5 ;\
l.sw PT_GPR6(r1),r6 ;\
l.sw PT_GPR7(r1),r7 ;\
l.sw PT_GPR8(r1),r8 ;\
l.sw PT_GPR9(r1),r9 ;\
/* r10 already saved */ ;\
l.sw PT_GPR11(r1),r11 ;\
/* r12 already saved */ ;\
l.sw PT_GPR13(r1),r13 ;\
l.sw PT_GPR14(r1),r14 ;\
l.sw PT_GPR15(r1),r15 ;\
l.sw PT_GPR16(r1),r16 ;\
l.sw PT_GPR17(r1),r17 ;\
l.sw PT_GPR18(r1),r18 ;\
l.sw PT_GPR19(r1),r19 ;\
l.sw PT_GPR20(r1),r20 ;\
l.sw PT_GPR21(r1),r21 ;\
l.sw PT_GPR22(r1),r22 ;\
l.sw PT_GPR23(r1),r23 ;\
l.sw PT_GPR24(r1),r24 ;\
l.sw PT_GPR25(r1),r25 ;\
l.sw PT_GPR26(r1),r26 ;\
l.sw PT_GPR27(r1),r27 ;\
l.sw PT_GPR28(r1),r28 ;\
l.sw PT_GPR29(r1),r29 ;\
/* r30 already save */ ;\
/* l.sw PT_GPR30(r1),r30*/ ;\
l.sw PT_GPR31(r1),r31 ;\
l.sw PT_SYSCALLNO(r1),r0
#define UNHANDLED_EXCEPTION(handler,vector) \
.global handler ;\
handler: ;\
/* r1, EPCR, ESR already saved */ ;\
l.sw PT_GPR2(r1),r2 ;\
l.sw PT_GPR3(r1),r3 ;\
l.sw PT_ORIG_GPR11(r1),r11 ;\
l.sw PT_GPR5(r1),r5 ;\
l.sw PT_GPR6(r1),r6 ;\
l.sw PT_GPR7(r1),r7 ;\
l.sw PT_GPR8(r1),r8 ;\
l.sw PT_GPR9(r1),r9 ;\
/* r10 already saved */ ;\
l.sw PT_GPR11(r1),r11 ;\
/* r12 already saved */ ;\
l.sw PT_GPR13(r1),r13 ;\
l.sw PT_GPR14(r1),r14 ;\
l.sw PT_GPR15(r1),r15 ;\
l.sw PT_GPR16(r1),r16 ;\
l.sw PT_GPR17(r1),r17 ;\
l.sw PT_GPR18(r1),r18 ;\
l.sw PT_GPR19(r1),r19 ;\
l.sw PT_GPR20(r1),r20 ;\
l.sw PT_GPR21(r1),r21 ;\
l.sw PT_GPR22(r1),r22 ;\
l.sw PT_GPR23(r1),r23 ;\
l.sw PT_GPR24(r1),r24 ;\
l.sw PT_GPR25(r1),r25 ;\
l.sw PT_GPR26(r1),r26 ;\
l.sw PT_GPR27(r1),r27 ;\
l.sw PT_GPR28(r1),r28 ;\
l.sw PT_GPR29(r1),r29 ;\
/* r31 already saved */ ;\
l.sw PT_GPR30(r1),r30 ;\
/* l.sw PT_GPR31(r1),r31 */ ;\
l.sw PT_SYSCALLNO(r1),r0 ;\
l.addi r3,r1,0 ;\
/* r4 is exception EA */ ;\
l.addi r5,r0,vector ;\
l.jal unhandled_exception ;\
l.nop ;\
l.j _ret_from_exception ;\
l.nop
/*
* NOTE: one should never assume that SPR_EPC, SPR_ESR, SPR_EEAR
* contain the same values as when exception we're handling
* occured. in fact they never do. if you need them use
* values saved on stack (for SPR_EPC, SPR_ESR) or content
* of r4 (for SPR_EEAR). for details look at EXCEPTION_HANDLE()
* in 'arch/or32/kernel/head.S'
*/
/* =====================================================[ exceptions] === */
/* ---[ 0x100: RESET exception ]----------------------------------------- */
EXCEPTION_ENTRY(_tng_kernel_start)
l.jal _start
l.andi r0,r0,0
/* ---[ 0x200: BUS exception ]------------------------------------------- */
EXCEPTION_ENTRY(_bus_fault_handler)
/* r4: EA of fault (set by EXCEPTION_HANDLE) */
l.jal do_bus_fault
l.addi r3,r1,0 /* pt_regs */
l.j _ret_from_exception
l.nop
/* ---[ 0x300: Data Page Fault exception ]------------------------------- */
EXCEPTION_ENTRY(_data_page_fault_handler)
/* set up parameters for do_page_fault */
l.addi r3,r1,0 // pt_regs
/* r4 set be EXCEPTION_HANDLE */ // effective address of fault
l.ori r5,r0,0x300 // exception vector
/*
* __PHX__: TODO
*
* all this can be written much simpler. look at
* DTLB miss handler in the CONFIG_GUARD_PROTECTED_CORE part
*/
#ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
l.lwz r6,PT_PC(r3) // address of an offending insn
l.lwz r6,0(r6) // instruction that caused pf
l.srli r6,r6,26 // check opcode for jump insn
l.sfeqi r6,0 // l.j
l.bf 8f
l.sfeqi r6,1 // l.jal
l.bf 8f
l.sfeqi r6,3 // l.bnf
l.bf 8f
l.sfeqi r6,4 // l.bf
l.bf 8f
l.sfeqi r6,0x11 // l.jr
l.bf 8f
l.sfeqi r6,0x12 // l.jalr
l.bf 8f
l.nop
l.j 9f
l.nop
8:
l.lwz r6,PT_PC(r3) // address of an offending insn
l.addi r6,r6,4
l.lwz r6,0(r6) // instruction that caused pf
l.srli r6,r6,26 // get opcode
9:
#else
l.mfspr r6,r0,SPR_SR // SR
// l.lwz r6,PT_SR(r3) // ESR
l.andi r6,r6,SPR_SR_DSX // check for delay slot exception
l.sfeqi r6,0x1 // exception happened in delay slot
l.bnf 7f
l.lwz r6,PT_PC(r3) // address of an offending insn
l.addi r6,r6,4 // offending insn is in delay slot
7:
l.lwz r6,0(r6) // instruction that caused pf
l.srli r6,r6,26 // check opcode for write access
#endif
l.sfgeui r6,0x34 // check opcode for write access
l.bnf 1f
l.sfleui r6,0x37
l.bnf 1f
l.ori r6,r0,0x1 // write access
l.j 2f
l.nop
1: l.ori r6,r0,0x0 // !write access
2:
/* call fault.c handler in or32/mm/fault.c */
l.jal do_page_fault
l.nop
l.j _ret_from_exception
l.nop
/* ---[ 0x400: Insn Page Fault exception ]------------------------------- */
EXCEPTION_ENTRY(_insn_page_fault_handler)
/* set up parameters for do_page_fault */
l.addi r3,r1,0 // pt_regs
/* r4 set be EXCEPTION_HANDLE */ // effective address of fault
l.ori r5,r0,0x400 // exception vector
l.ori r6,r0,0x0 // !write access
/* call fault.c handler in or32/mm/fault.c */
l.jal do_page_fault
l.nop
l.j _ret_from_exception
l.nop
/* ---[ 0x500: Timer exception ]----------------------------------------- */
EXCEPTION_ENTRY(_timer_handler)
l.jal timer_interrupt
l.addi r3,r1,0 /* pt_regs */
l.j _ret_from_intr
l.nop
/* ---[ 0x600: Aligment exception ]-------------------------------------- */
EXCEPTION_ENTRY(_alignment_handler)
/* r4: EA of fault (set by EXCEPTION_HANDLE) */
l.jal do_unaligned_access
l.addi r3,r1,0 /* pt_regs */
l.j _ret_from_exception
l.nop
#if 0
EXCEPTION_ENTRY(_aligment_handler)
// l.mfspr r2,r0,SPR_EEAR_BASE /* Load the efective addres */
l.addi r2,r4,0
// l.mfspr r5,r0,SPR_EPCR_BASE /* Load the insn address */
l.lwz r5,PT_PC(r1)
l.lwz r3,0(r5) /* Load insn */
l.srli r4,r3,26 /* Shift left to get the insn opcode */
l.sfeqi r4,0x00 /* Check if the load/store insn is in delay slot */
l.bf jmp
l.sfeqi r4,0x01
l.bf jmp
l.sfeqi r4,0x03
l.bf jmp
l.sfeqi r4,0x04
l.bf jmp
l.sfeqi r4,0x11
l.bf jr
l.sfeqi r4,0x12
l.bf jr
l.nop
l.j 1f
l.addi r5,r5,4 /* Increment PC to get return insn address */
jmp:
l.slli r4,r3,6 /* Get the signed extended jump length */
l.srai r4,r4,4
l.lwz r3,4(r5) /* Load the real load/store insn */
l.add r5,r5,r4 /* Calculate jump target address */
l.j 1f
l.srli r4,r3,26 /* Shift left to get the insn opcode */
jr:
l.slli r4,r3,9 /* Shift to get the reg nb */
l.andi r4,r4,0x7c
l.lwz r3,4(r5) /* Load the real load/store insn */
l.add r4,r4,r1 /* Load the jump register value from the stack */
l.lwz r5,0(r4)
l.srli r4,r3,26 /* Shift left to get the insn opcode */
1:
// l.mtspr r0,r5,SPR_EPCR_BASE
l.sw PT_PC(r1),r5
l.sfeqi r4,0x26
l.bf lhs
l.sfeqi r4,0x25
l.bf lhz
l.sfeqi r4,0x22
l.bf lws
l.sfeqi r4,0x21
l.bf lwz
l.sfeqi r4,0x37
l.bf sh
l.sfeqi r4,0x35
l.bf sw
l.nop
1: l.j 1b /* I don't know what to do */
l.nop
lhs: l.lbs r5,0(r2)
l.slli r5,r5,8
l.lbz r6,1(r2)
l.or r5,r5,r6
l.srli r4,r3,19
l.andi r4,r4,0x7c
l.add r4,r4,r1
l.j align_end
l.sw 0(r4),r5
lhz: l.lbz r5,0(r2)
l.slli r5,r5,8
l.lbz r6,1(r2)
l.or r5,r5,r6
l.srli r4,r3,19
l.andi r4,r4,0x7c
l.add r4,r4,r1
l.j align_end
l.sw 0(r4),r5
lws: l.lbs r5,0(r2)
l.slli r5,r5,24
l.lbz r6,1(r2)
l.slli r6,r6,16
l.or r5,r5,r6
l.lbz r6,2(r2)
l.slli r6,r6,8
l.or r5,r5,r6
l.lbz r6,3(r2)
l.or r5,r5,r6
l.srli r4,r3,19
l.andi r4,r4,0x7c
l.add r4,r4,r1
l.j align_end
l.sw 0(r4),r5
lwz: l.lbz r5,0(r2)
l.slli r5,r5,24
l.lbz r6,1(r2)
l.slli r6,r6,16
l.or r5,r5,r6
l.lbz r6,2(r2)
l.slli r6,r6,8
l.or r5,r5,r6
l.lbz r6,3(r2)
l.or r5,r5,r6
l.srli r4,r3,19
l.andi r4,r4,0x7c
l.add r4,r4,r1
l.j align_end
l.sw 0(r4),r5
sh:
l.srli r4,r3,9
l.andi r4,r4,0x7c
l.add r4,r4,r1
l.lwz r5,0(r4)
l.sb 1(r2),r5
l.srli r5,r5,8
l.j align_end
l.sb 0(r2),r5
sw:
l.srli r4,r3,9
l.andi r4,r4,0x7c
l.add r4,r4,r1
l.lwz r5,0(r4)
l.sb 3(r2),r5
l.srli r5,r5,8
l.sb 2(r2),r5
l.srli r5,r5,8
l.sb 1(r2),r5
l.srli r5,r5,8
l.j align_end
l.sb 0(r2),r5
align_end:
l.j _ret_from_intr
l.nop
#endif
/* ---[ 0x700: Illegal insn exception ]---------------------------------- */
EXCEPTION_ENTRY(_illegal_instruction_handler)
/* r4: EA of fault (set by EXCEPTION_HANDLE) */
l.jal do_illegal_instruction
l.addi r3,r1,0 /* pt_regs */
l.j _ret_from_exception
l.nop
/* ---[ 0x800: External interrupt exception ]---------------------------- */
EXCEPTION_ENTRY(_external_irq_handler)
#ifdef CONFIG_OPENRISC_ESR_EXCEPTION_BUG_CHECK
l.lwz r4,PT_SR(r1) // were interrupts enabled ?
l.andi r4,r4,SPR_SR_IEE
l.sfeqi r4,0
l.bnf 1f // ext irq enabled, all ok.
l.nop
l.addi r1,r1,-0x8
l.movhi r3,hi(42f)
l.ori r3,r3,lo(42f)
l.sw 0x0(r1),r3
l.jal printk
l.sw 0x4(r1),r4
l.addi r1,r1,0x8
.section .rodata, "a"
42:
.string "\n\rESR interrupt bug: in _external_irq_handler (ESR %x)\n\r"
.align 4
.previous
l.ori r4,r4,SPR_SR_IEE // fix the bug
// l.sw PT_SR(r1),r4
1:
#endif
l.addi r3,r1,0
l.movhi r8,hi(do_IRQ)
l.ori r8,r8,lo(do_IRQ)
l.jalr r8
l.nop
l.j _ret_from_intr
l.nop
/* ---[ 0x900: DTLB miss exception ]------------------------------------- */
/* ---[ 0xa00: ITLB miss exception ]------------------------------------- */
/* ---[ 0xb00: Range exception ]----------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0xb00,0xb00)
/* ---[ 0xc00: Syscall exception ]--------------------------------------- */
/*
* Syscalls are a special type of exception in that they are
* _explicitly_ invoked by userspace and can therefore be
* held to conform to the same ABI as normal functions with
* respect to whether registers are preserved across the call
* or not.
*/
/* Upon syscall entry we just save the callee-saved registers
* and not the call-clobbered ones.
*/
_string_syscall_return:
.string "syscall return %ld \n\r\0"
.align 4
ENTRY(_sys_call_handler)
/* syscalls run with interrupts enabled */
ENABLE_INTERRUPTS(r29) // enable interrupts, r29 is temp
/* r1, EPCR, ESR a already saved */
l.sw PT_GPR2(r1),r2
/* r3-r8 must be saved because syscall restart relies
* on us being able to restart the syscall args... technically
* they should be clobbered, otherwise
*/
l.sw PT_GPR3(r1),r3
/* r4 already saved */
/* r4 holds the EEAR address of the fault, load the original r4 */
l.lwz r4,PT_GPR4(r1)
l.sw PT_GPR5(r1),r5
l.sw PT_GPR6(r1),r6
l.sw PT_GPR7(r1),r7
l.sw PT_GPR8(r1),r8
l.sw PT_GPR9(r1),r9
/* r10 already saved */
l.sw PT_GPR11(r1),r11
l.sw PT_ORIG_GPR11(r1),r11
/* r12,r13 already saved */
/* r14-r28 (even) aren't touched by the syscall fast path below
* so we don't need to save them. However, the functions that return
* to userspace via a call to switch() DO need to save these because
* switch() effectively clobbers them... saving these registers for
* such functions is handled in their syscall wrappers (see fork, vfork,
* and clone, below).
/* r30 is the only register we clobber in the fast path */
/* r30 already saved */
/* l.sw PT_GPR30(r1),r30 */
/* This is used by do_signal to determine whether to check for
* syscall restart or not */
l.sw PT_SYSCALLNO(r1),r11
_syscall_check_trace_enter:
/* If TIF_SYSCALL_TRACE is set, then we want to do syscall tracing */
l.lwz r30,TI_FLAGS(r10)
l.andi r30,r30,_TIF_SYSCALL_TRACE
l.sfne r30,r0
l.bf _syscall_trace_enter
l.nop
_syscall_check:
/* Ensure that the syscall number is reasonable */
l.sfgeui r11,__NR_syscalls
l.bf _syscall_badsys
l.nop
_syscall_call:
l.movhi r29,hi(sys_call_table)
l.ori r29,r29,lo(sys_call_table)
l.slli r11,r11,2
l.add r29,r29,r11
l.lwz r29,0(r29)
l.jalr r29
l.nop
_syscall_return:
/* All syscalls return here... just pay attention to ret_from_fork
* which does it in a round-about way.
*/
l.sw PT_GPR11(r1),r11 // save return value
#if 0
_syscall_debug:
l.movhi r3,hi(_string_syscall_return)
l.ori r3,r3,lo(_string_syscall_return)
l.ori r27,r0,1
l.sw -4(r1),r27
l.sw -8(r1),r11
l.addi r1,r1,-8
l.movhi r27,hi(printk)
l.ori r27,r27,lo(printk)
l.jalr r27
l.nop
l.addi r1,r1,8
#endif
_syscall_check_trace_leave:
/* r30 is a callee-saved register so this should still hold the
* _TIF_SYSCALL_TRACE flag from _syscall_check_trace_enter above...
* _syscall_trace_leave expects syscall result to be in pt_regs->r11.
*/
l.sfne r30,r0
l.bf _syscall_trace_leave
l.nop
/* This is where the exception-return code begins... interrupts need to be
* disabled the rest of the way here because we can't afford to miss any
* interrupts that set NEED_RESCHED or SIGNALPENDING... really true? */
_syscall_check_work:
/* Here we need to disable interrupts */
DISABLE_INTERRUPTS(r27,r29)
l.lwz r30,TI_FLAGS(r10)
l.andi r30,r30,_TIF_WORK_MASK
l.sfne r30,r0
l.bnf _syscall_resume_userspace
l.nop
/* Work pending follows a different return path, so we need to
* make sure that all the call-saved registers get into pt_regs
* before branching...
*/
l.sw PT_GPR14(r1),r14
l.sw PT_GPR16(r1),r16
l.sw PT_GPR18(r1),r18
l.sw PT_GPR20(r1),r20
l.sw PT_GPR22(r1),r22
l.sw PT_GPR24(r1),r24
l.sw PT_GPR26(r1),r26
l.sw PT_GPR28(r1),r28
/* _work_pending needs to be called with interrupts disabled */
l.j _work_pending
l.nop
_syscall_resume_userspace:
// ENABLE_INTERRUPTS(r29)
/* This is the hot path for returning to userspace from a syscall. If there's
* work to be done and the branch to _work_pending was taken above, then the
* return to userspace will be done via the normal exception return path...
* that path restores _all_ registers and will overwrite the "clobbered"
* registers with whatever garbage is in pt_regs -- that's OK because those
* registers are clobbered anyway and because the extra work is insignificant
* in the context of the extra work that _work_pending is doing.
/* Once again, syscalls are special and only guarantee to preserve the
* same registers as a normal function call */
/* The assumption here is that the registers r14-r28 (even) are untouched and
* don't need to be restored... be sure that that's really the case!
*/
/* This is still too much... we should only be restoring what we actually
* clobbered... we should even be using 'scratch' (odd) regs above so that
* we don't need to restore anything, hardly...
*/
l.lwz r2,PT_GPR2(r1)
/* Restore args */
/* r3-r8 are technically clobbered, but syscall restart needs these
* to be restored...
*/
l.lwz r3,PT_GPR3(r1)
l.lwz r4,PT_GPR4(r1)
l.lwz r5,PT_GPR5(r1)
l.lwz r6,PT_GPR6(r1)
l.lwz r7,PT_GPR7(r1)
l.lwz r8,PT_GPR8(r1)
l.lwz r9,PT_GPR9(r1)
l.lwz r10,PT_GPR10(r1)
l.lwz r11,PT_GPR11(r1)
/* r30 is the only register we clobber in the fast path */
l.lwz r30,PT_GPR30(r1)
/* Here we use r13-r19 (odd) as scratch regs */
l.lwz r13,PT_PC(r1)
l.lwz r15,PT_SR(r1)
l.lwz r1,PT_SP(r1)
/* Interrupts need to be disabled for setting EPCR and ESR
* so that another interrupt doesn't come in here and clobber
* them before we can use them for our l.rfe */
DISABLE_INTERRUPTS(r17,r19)
l.mtspr r0,r13,SPR_EPCR_BASE
l.mtspr r0,r15,SPR_ESR_BASE
l.rfe
/* End of hot path!
* Keep the below tracing and error handling out of the hot path...
*/
_syscall_trace_enter:
/* Here we pass pt_regs to do_syscall_trace_enter. Make sure
* that function is really getting all the info it needs as
* pt_regs isn't a complete set of userspace regs, just the
* ones relevant to the syscall...
*
* Note use of delay slot for setting argument.
*/
l.jal do_syscall_trace_enter
l.addi r3,r1,0
/* Restore arguments (not preserved across do_syscall_trace_enter)
* so that we can do the syscall for real and return to the syscall
* hot path.
*/
l.lwz r11,PT_SYSCALLNO(r1)
l.lwz r3,PT_GPR3(r1)
l.lwz r4,PT_GPR4(r1)
l.lwz r5,PT_GPR5(r1)
l.lwz r6,PT_GPR6(r1)
l.lwz r7,PT_GPR7(r1)
l.j _syscall_check
l.lwz r8,PT_GPR8(r1)
_syscall_trace_leave:
l.jal do_syscall_trace_leave
l.addi r3,r1,0
l.j _syscall_check_work
l.nop
_syscall_badsys:
/* Here we effectively pretend to have executed an imaginary
* syscall that returns -ENOSYS and then return to the regular
* syscall hot path.
* Note that "return value" is set in the delay slot...
*/
l.j _syscall_return
l.addi r11,r0,-ENOSYS
/******* END SYSCALL HANDLING *******/
/* ---[ 0xd00: Trap exception ]------------------------------------------ */
UNHANDLED_EXCEPTION(_vector_0xd00,0xd00)
/* ---[ 0xe00: Trap exception ]------------------------------------------ */
EXCEPTION_ENTRY(_trap_handler)
/* r4: EA of fault (set by EXCEPTION_HANDLE) */
l.jal do_trap
l.addi r3,r1,0 /* pt_regs */
l.j _ret_from_exception
l.nop
/* ---[ 0xf00: Reserved exception ]-------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0xf00,0xf00)
/* ---[ 0x1000: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1000,0x1000)
/* ---[ 0x1100: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1100,0x1100)
/* ---[ 0x1200: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1200,0x1200)
/* ---[ 0x1300: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1300,0x1300)
/* ---[ 0x1400: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1400,0x1400)
/* ---[ 0x1500: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1500,0x1500)
/* ---[ 0x1600: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1600,0x1600)
/* ---[ 0x1700: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1700,0x1700)
/* ---[ 0x1800: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1800,0x1800)
/* ---[ 0x1900: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1900,0x1900)
/* ---[ 0x1a00: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1a00,0x1a00)
/* ---[ 0x1b00: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1b00,0x1b00)
/* ---[ 0x1c00: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1c00,0x1c00)
/* ---[ 0x1d00: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1d00,0x1d00)
/* ---[ 0x1e00: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1e00,0x1e00)
/* ---[ 0x1f00: Reserved exception ]------------------------------------- */
UNHANDLED_EXCEPTION(_vector_0x1f00,0x1f00)
/* ========================================================[ return ] === */
_work_pending:
/*
* if (current_thread_info->flags & _TIF_NEED_RESCHED)
* schedule();
*/
l.lwz r5,TI_FLAGS(r10)
l.andi r3,r5,_TIF_NEED_RESCHED
l.sfnei r3,0
l.bnf _work_notifysig
l.nop
l.jal schedule
l.nop
l.j _resume_userspace
l.nop
/* Handle pending signals and notify-resume requests.
* do_notify_resume must be passed the latest pushed pt_regs, not
* necessarily the "userspace" ones. Also, pt_regs->syscallno
* must be set so that the syscall restart functionality works.
*/
_work_notifysig:
l.jal do_notify_resume
l.ori r3,r1,0 /* pt_regs */
_resume_userspace:
DISABLE_INTERRUPTS(r3,r4)
l.lwz r3,TI_FLAGS(r10)
l.andi r3,r3,_TIF_WORK_MASK
l.sfnei r3,0
l.bf _work_pending
l.nop
_restore_all:
RESTORE_ALL
/* This returns to userspace code */
ENTRY(_ret_from_intr)
ENTRY(_ret_from_exception)
l.lwz r4,PT_SR(r1)
l.andi r3,r4,SPR_SR_SM
l.sfeqi r3,0
l.bnf _restore_all
l.nop
l.j _resume_userspace
l.nop
ENTRY(ret_from_fork)
l.jal schedule_tail
l.nop
/* _syscall_returns expect r11 to contain return value */
l.lwz r11,PT_GPR11(r1)
/* The syscall fast path return expects call-saved registers
* r12-r28 to be untouched, so we restore them here as they
* will have been effectively clobbered when arriving here
* via the call to switch()
*/
l.lwz r12,PT_GPR12(r1)
l.lwz r14,PT_GPR14(r1)
l.lwz r16,PT_GPR16(r1)
l.lwz r18,PT_GPR18(r1)
l.lwz r20,PT_GPR20(r1)
l.lwz r22,PT_GPR22(r1)
l.lwz r24,PT_GPR24(r1)
l.lwz r26,PT_GPR26(r1)
l.lwz r28,PT_GPR28(r1)
l.j _syscall_return
l.nop
/* Since syscalls don't save call-clobbered registers, the args to
* kernel_thread_helper will need to be passed through callee-saved
* registers and copied to the parameter registers when the thread
* begins running.
*
* See arch/openrisc/kernel/process.c:
* The args are passed as follows:
* arg1 (r3) : passed in r20
* arg2 (r4) : passed in r22
*/
ENTRY(_kernel_thread_helper)
l.or r3,r20,r0
l.or r4,r22,r0
l.movhi r31,hi(kernel_thread_helper)
l.ori r31,r31,lo(kernel_thread_helper)
l.jr r31
l.nop
/* ========================================================[ switch ] === */
/*
* This routine switches between two different tasks. The process
* state of one is saved on its kernel stack. Then the state
* of the other is restored from its kernel stack. The memory
* management hardware is updated to the second process's state.
* Finally, we can return to the second process, via the 'return'.
*
* Note: there are two ways to get to the "going out" portion
* of this code; either by coming in via the entry (_switch)
* or via "fork" which must set up an environment equivalent
* to the "_switch" path. If you change this (or in particular, the
* SAVE_REGS macro), you'll have to change the fork code also.
*/
/* _switch MUST never lay on page boundry, cause it runs from
* effective addresses and beeing interrupted by iTLB miss would kill it.
* dTLB miss seams to never accour in the bad place since data accesses
* are from task structures which are always page aligned.
*
* The problem happens in RESTORE_ALL_NO_R11 where we first set the EPCR
* register, then load the previous register values and only at the end call
* the l.rfe instruction. If get TLB miss in beetwen the EPCR register gets
* garbled and we end up calling l.rfe with the wrong EPCR. (same probably
* holds for ESR)
*
* To avoid this problems it is sufficient to align _switch to
* some nice round number smaller than it's size...
*/
/* ABI rules apply here... we either enter _switch via schedule() or via
* an imaginary call to which we shall return at return_from_fork. Either
* way, we are a function call and only need to preserve the callee-saved
* registers when we return. As such, we don't need to save the registers
* on the stack that we won't be returning as they were...
*/
.align 0x400
ENTRY(_switch)
/* We don't store SR as _switch only gets called in a context where
* the SR will be the same going in and coming out... */
/* Set up new pt_regs struct for saving task state */
l.addi r1,r1,-(INT_FRAME_SIZE)
/* No need to store r1/PT_SP as it goes into KSP below */
l.sw PT_GPR2(r1),r2
l.sw PT_GPR9(r1),r9
/* This is wrong, r12 shouldn't be here... but GCC is broken for the time being
* and expects r12 to be callee-saved... */
l.sw PT_GPR12(r1),r12
l.sw PT_GPR14(r1),r14
l.sw PT_GPR16(r1),r16
l.sw PT_GPR18(r1),r18
l.sw PT_GPR20(r1),r20
l.sw PT_GPR22(r1),r22
l.sw PT_GPR24(r1),r24
l.sw PT_GPR26(r1),r26
l.sw PT_GPR28(r1),r28
l.sw PT_GPR30(r1),r30
l.addi r11,r10,0 /* Save old 'current' to 'last' return value*/
/* We use thread_info->ksp for storing the address of the above
* structure so that we can get back to it later... we don't want
* to lose the value of thread_info->ksp, though, so store it as
* pt_regs->sp so that we can easily restore it when we are made
* live again...
*/
/* Save the old value of thread_info->ksp as pt_regs->sp */
l.lwz r29,TI_KSP(r10)
l.sw PT_SP(r1),r29
/* Swap kernel stack pointers */
l.sw TI_KSP(r10),r1 /* Save old stack pointer */
l.or r10,r4,r0 /* Set up new current_thread_info */
l.lwz r1,TI_KSP(r10) /* Load new stack pointer */
/* Restore the old value of thread_info->ksp */
l.lwz r29,PT_SP(r1)
l.sw TI_KSP(r10),r29
/* ...and restore the registers, except r11 because the return value
* has already been set above.
*/
l.lwz r2,PT_GPR2(r1)
l.lwz r9,PT_GPR9(r1)
/* No need to restore r10 */
/* ...and do not restore r11 */
/* This is wrong, r12 shouldn't be here... but GCC is broken for the time being
* and expects r12 to be callee-saved... */
l.lwz r12,PT_GPR12(r1)
l.lwz r14,PT_GPR14(r1)
l.lwz r16,PT_GPR16(r1)
l.lwz r18,PT_GPR18(r1)
l.lwz r20,PT_GPR20(r1)
l.lwz r22,PT_GPR22(r1)
l.lwz r24,PT_GPR24(r1)
l.lwz r26,PT_GPR26(r1)
l.lwz r28,PT_GPR28(r1)
l.lwz r30,PT_GPR30(r1)
/* Unwind stack to pre-switch state */
l.addi r1,r1,(INT_FRAME_SIZE)
/* Return via the link-register back to where we 'came from', where that can be
* either schedule() or return_from_fork()... */
l.jr r9
l.nop
/* ==================================================================== */
/* These all use the delay slot for setting the argument register, so the
* jump is always happening after the l.addi instruction.
*
* These are all just wrappers that don't touch the link-register r9, so the
* return from the "real" syscall function will return back to the syscall
* code that did the l.jal that brought us here.
*/
/* fork requires that we save all the callee-saved registers because they
* are all effectively clobbered by the call to _switch. Here we store
* all the registers that aren't touched by the syscall fast path and thus
* weren't saved there.
*/
_fork_save_extra_regs_and_call:
l.sw PT_GPR14(r1),r14
l.sw PT_GPR16(r1),r16
l.sw PT_GPR18(r1),r18
l.sw PT_GPR20(r1),r20
l.sw PT_GPR22(r1),r22
l.sw PT_GPR24(r1),r24
l.sw PT_GPR26(r1),r26
l.jr r29
l.sw PT_GPR28(r1),r28
ENTRY(sys_clone)
l.movhi r29,hi(_sys_clone)
l.ori r29,r29,lo(_sys_clone)
l.j _fork_save_extra_regs_and_call
l.addi r7,r1,0
ENTRY(sys_fork)
l.movhi r29,hi(_sys_fork)
l.ori r29,r29,lo(_sys_fork)
l.j _fork_save_extra_regs_and_call
l.addi r3,r1,0
ENTRY(sys_execve)
l.j _sys_execve
l.addi r6,r1,0
ENTRY(sys_sigaltstack)
l.j _sys_sigaltstack
l.addi r5,r1,0
ENTRY(sys_rt_sigreturn)
l.j _sys_rt_sigreturn
l.addi r3,r1,0
/* This is a catch-all syscall for atomic instructions for the OpenRISC 1000.
* The functions takes a variable number of parameters depending on which
* particular flavour of atomic you want... parameter 1 is a flag identifying
* the atomic in question. Currently, this function implements the
* following variants:
*
* XCHG:
* @flag: 1
* @ptr1:
* @ptr2:
* Atomically exchange the values in pointers 1 and 2.
*
*/
ENTRY(sys_or1k_atomic)
/* FIXME: This ignores r3 and always does an XCHG */
DISABLE_INTERRUPTS(r17,r19)
l.lwz r30,0(r4)
l.lwz r28,0(r5)
l.sw 0(r4),r28
l.sw 0(r5),r30
ENABLE_INTERRUPTS(r17)
l.jr r9
l.or r11,r0,r0
/* ============================================================[ EOF ]=== */
arch/openrisc/kernel/head.S 0 → 100644
View file @ 9d02a428
/*
* OpenRISC head.S
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* Modifications for the OpenRISC architecture:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/linkage.h>
#include <linux/threads.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/cache.h>
#include <asm/spr_defs.h>
#include <asm/asm-offsets.h>
#define tophys(rd,rs) \
l.movhi rd,hi(-KERNELBASE) ;\
l.add rd,rd,rs
#define CLEAR_GPR(gpr) \
l.or gpr,r0,r0
#define LOAD_SYMBOL_2_GPR(gpr,symbol) \
l.movhi gpr,hi(symbol) ;\
l.ori gpr,gpr,lo(symbol)
#define UART_BASE_ADD 0x90000000
#define EXCEPTION_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_DCE | SPR_SR_ICE | SPR_SR_SM)
#define SYSCALL_SR (SPR_SR_DME | SPR_SR_IME | SPR_SR_DCE | SPR_SR_ICE | SPR_SR_IEE | SPR_SR_TEE | SPR_SR_SM)
/* ============================================[ tmp store locations ]=== */
/*
* emergency_print temporary stores
*/
#define EMERGENCY_PRINT_STORE_GPR4 l.sw 0x20(r0),r4
#define EMERGENCY_PRINT_LOAD_GPR4 l.lwz r4,0x20(r0)
#define EMERGENCY_PRINT_STORE_GPR5 l.sw 0x24(r0),r5
#define EMERGENCY_PRINT_LOAD_GPR5 l.lwz r5,0x24(r0)
#define EMERGENCY_PRINT_STORE_GPR6 l.sw 0x28(r0),r6
#define EMERGENCY_PRINT_LOAD_GPR6 l.lwz r6,0x28(r0)
#define EMERGENCY_PRINT_STORE_GPR7 l.sw 0x2c(r0),r7
#define EMERGENCY_PRINT_LOAD_GPR7 l.lwz r7,0x2c(r0)
#define EMERGENCY_PRINT_STORE_GPR8 l.sw 0x30(r0),r8
#define EMERGENCY_PRINT_LOAD_GPR8 l.lwz r8,0x30(r0)
#define EMERGENCY_PRINT_STORE_GPR9 l.sw 0x34(r0),r9
#define EMERGENCY_PRINT_LOAD_GPR9 l.lwz r9,0x34(r0)
/*
* TLB miss handlers temorary stores
*/
#define EXCEPTION_STORE_GPR9 l.sw 0x10(r0),r9
#define EXCEPTION_LOAD_GPR9 l.lwz r9,0x10(r0)
#define EXCEPTION_STORE_GPR2 l.sw 0x64(r0),r2
#define EXCEPTION_LOAD_GPR2 l.lwz r2,0x64(r0)
#define EXCEPTION_STORE_GPR3 l.sw 0x68(r0),r3
#define EXCEPTION_LOAD_GPR3 l.lwz r3,0x68(r0)
#define EXCEPTION_STORE_GPR4 l.sw 0x6c(r0),r4
#define EXCEPTION_LOAD_GPR4 l.lwz r4,0x6c(r0)
#define EXCEPTION_STORE_GPR5 l.sw 0x70(r0),r5
#define EXCEPTION_LOAD_GPR5 l.lwz r5,0x70(r0)
#define EXCEPTION_STORE_GPR6 l.sw 0x74(r0),r6
#define EXCEPTION_LOAD_GPR6 l.lwz r6,0x74(r0)
/*
* EXCEPTION_HANDLE temporary stores
*/
#define EXCEPTION_T_STORE_GPR30 l.sw 0x78(r0),r30
#define EXCEPTION_T_LOAD_GPR30(reg) l.lwz reg,0x78(r0)
#define EXCEPTION_T_STORE_GPR10 l.sw 0x7c(r0),r10
#define EXCEPTION_T_LOAD_GPR10(reg) l.lwz reg,0x7c(r0)
#define EXCEPTION_T_STORE_SP l.sw 0x80(r0),r1
#define EXCEPTION_T_LOAD_SP(reg) l.lwz reg,0x80(r0)
/*
* For UNHANLDED_EXCEPTION
*/
#define EXCEPTION_T_STORE_GPR31 l.sw 0x84(r0),r31
#define EXCEPTION_T_LOAD_GPR31(reg) l.lwz reg,0x84(r0)
/* =========================================================[ macros ]=== */
#define GET_CURRENT_PGD(reg,t1) \
LOAD_SYMBOL_2_GPR(reg,current_pgd) ;\
tophys (t1,reg) ;\
l.lwz reg,0(t1)
/*
* DSCR: this is a common hook for handling exceptions. it will save
* the needed registers, set up stack and pointer to current
* then jump to the handler while enabling MMU
*
* PRMS: handler - a function to jump to. it has to save the
* remaining registers to kernel stack, call
* appropriate arch-independant exception handler
* and finaly jump to ret_from_except
*
* PREQ: unchanged state from the time exception happened
*
* POST: SAVED the following registers original value
* to the new created exception frame pointed to by r1
*
* r1 - ksp pointing to the new (exception) frame
* r4 - EEAR exception EA
* r10 - current pointing to current_thread_info struct
* r12 - syscall 0, since we didn't come from syscall
* r13 - temp it actually contains new SR, not needed anymore
* r31 - handler address of the handler we'll jump to
*
* handler has to save remaining registers to the exception
* ksp frame *before* tainting them!
*
* NOTE: this function is not reentrant per se. reentrancy is guaranteed
* by processor disabling all exceptions/interrupts when exception
* accours.
*
* OPTM: no need to make it so wasteful to extract ksp when in user mode
*/
#define EXCEPTION_HANDLE(handler) \
EXCEPTION_T_STORE_GPR30 ;\
l.mfspr r30,r0,SPR_ESR_BASE ;\
l.andi r30,r30,SPR_SR_SM ;\
l.sfeqi r30,0 ;\
EXCEPTION_T_STORE_GPR10 ;\
l.bnf 2f /* kernel_mode */ ;\
EXCEPTION_T_STORE_SP /* delay slot */ ;\
1: /* user_mode: */ ;\
LOAD_SYMBOL_2_GPR(r1,current_thread_info_set) ;\
tophys (r30,r1) ;\
/* r10: current_thread_info */ ;\
l.lwz r10,0(r30) ;\
tophys (r30,r10) ;\
l.lwz r1,(TI_KSP)(r30) ;\
/* fall through */ ;\
2: /* kernel_mode: */ ;\
/* create new stack frame, save only needed gprs */ ;\
/* r1: KSP, r10: current, r4: EEAR, r31: __pa(KSP) */ ;\
/* r12: temp, syscall indicator */ ;\
l.addi r1,r1,-(INT_FRAME_SIZE) ;\
/* r1 is KSP, r30 is __pa(KSP) */ ;\
tophys (r30,r1) ;\
l.sw PT_GPR12(r30),r12 ;\
l.mfspr r12,r0,SPR_EPCR_BASE ;\
l.sw PT_PC(r30),r12 ;\
l.mfspr r12,r0,SPR_ESR_BASE ;\
l.sw PT_SR(r30),r12 ;\
/* save r30 */ ;\
EXCEPTION_T_LOAD_GPR30(r12) ;\
l.sw PT_GPR30(r30),r12 ;\
/* save r10 as was prior to exception */ ;\
EXCEPTION_T_LOAD_GPR10(r12) ;\
l.sw PT_GPR10(r30),r12 ;\
/* save PT_SP as was prior to exception */ ;\
EXCEPTION_T_LOAD_SP(r12) ;\
l.sw PT_SP(r30),r12 ;\
/* save exception r4, set r4 = EA */ ;\
l.sw PT_GPR4(r30),r4 ;\
l.mfspr r4,r0,SPR_EEAR_BASE ;\
/* r12 == 1 if we come from syscall */ ;\
CLEAR_GPR(r12) ;\
/* ----- turn on MMU ----- */ ;\
l.ori r30,r0,(EXCEPTION_SR) ;\
l.mtspr r0,r30,SPR_ESR_BASE ;\
/* r30: EA address of handler */ ;\
LOAD_SYMBOL_2_GPR(r30,handler) ;\
l.mtspr r0,r30,SPR_EPCR_BASE ;\
l.rfe
/*
* this doesn't work
*
*
* #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
* #define UNHANDLED_EXCEPTION(handler) \
* l.ori r3,r0,0x1 ;\
* l.mtspr r0,r3,SPR_SR ;\
* l.movhi r3,hi(0xf0000100) ;\
* l.ori r3,r3,lo(0xf0000100) ;\
* l.jr r3 ;\
* l.nop 1
*
* #endif
*/
/* DSCR: this is the same as EXCEPTION_HANDLE(), we are just
* a bit more carefull (if we have a PT_SP or current pointer
* corruption) and set them up from 'current_set'
*
*/
#define UNHANDLED_EXCEPTION(handler) \
EXCEPTION_T_STORE_GPR31 ;\
EXCEPTION_T_STORE_GPR10 ;\
EXCEPTION_T_STORE_SP ;\
/* temporary store r3, r9 into r1, r10 */ ;\
l.addi r1,r3,0x0 ;\
l.addi r10,r9,0x0 ;\
/* the string referenced by r3 must be low enough */ ;\
l.jal _emergency_print ;\
l.ori r3,r0,lo(_string_unhandled_exception) ;\
l.mfspr r3,r0,SPR_NPC ;\
l.jal _emergency_print_nr ;\
l.andi r3,r3,0x1f00 ;\
/* the string referenced by r3 must be low enough */ ;\
l.jal _emergency_print ;\
l.ori r3,r0,lo(_string_epc_prefix) ;\
l.jal _emergency_print_nr ;\
l.mfspr r3,r0,SPR_EPCR_BASE ;\
l.jal _emergency_print ;\
l.ori r3,r0,lo(_string_nl) ;\
/* end of printing */ ;\
l.addi r3,r1,0x0 ;\
l.addi r9,r10,0x0 ;\
/* extract current, ksp from current_set */ ;\
LOAD_SYMBOL_2_GPR(r1,_unhandled_stack_top) ;\
LOAD_SYMBOL_2_GPR(r10,init_thread_union) ;\
/* create new stack frame, save only needed gprs */ ;\
/* r1: KSP, r10: current, r31: __pa(KSP) */ ;\
/* r12: temp, syscall indicator, r13 temp */ ;\
l.addi r1,r1,-(INT_FRAME_SIZE) ;\
/* r1 is KSP, r31 is __pa(KSP) */ ;\
tophys (r31,r1) ;\
l.sw PT_GPR12(r31),r12 ;\
l.mfspr r12,r0,SPR_EPCR_BASE ;\
l.sw PT_PC(r31),r12 ;\
l.mfspr r12,r0,SPR_ESR_BASE ;\
l.sw PT_SR(r31),r12 ;\
/* save r31 */ ;\
EXCEPTION_T_LOAD_GPR31(r12) ;\
l.sw PT_GPR31(r31),r12 ;\
/* save r10 as was prior to exception */ ;\
EXCEPTION_T_LOAD_GPR10(r12) ;\
l.sw PT_GPR10(r31),r12 ;\
/* save PT_SP as was prior to exception */ ;\
EXCEPTION_T_LOAD_SP(r12) ;\
l.sw PT_SP(r31),r12 ;\
l.sw PT_GPR13(r31),r13 ;\
/* --> */ ;\
/* save exception r4, set r4 = EA */ ;\
l.sw PT_GPR4(r31),r4 ;\
l.mfspr r4,r0,SPR_EEAR_BASE ;\
/* r12 == 1 if we come from syscall */ ;\
CLEAR_GPR(r12) ;\
/* ----- play a MMU trick ----- */ ;\
l.ori r31,r0,(EXCEPTION_SR) ;\
l.mtspr r0,r31,SPR_ESR_BASE ;\
/* r31: EA address of handler */ ;\
LOAD_SYMBOL_2_GPR(r31,handler) ;\
l.mtspr r0,r31,SPR_EPCR_BASE ;\
l.rfe
/* =====================================================[ exceptions] === */
/* ---[ 0x100: RESET exception ]----------------------------------------- */
.org 0x100
/* Jump to .init code at _start which lives in the .head section
* and will be discarded after boot.
*/
LOAD_SYMBOL_2_GPR(r4, _start)
tophys (r3,r4) /* MMU disabled */
l.jr r3
l.nop
/* ---[ 0x200: BUS exception ]------------------------------------------- */
.org 0x200
_dispatch_bus_fault:
EXCEPTION_HANDLE(_bus_fault_handler)
/* ---[ 0x300: Data Page Fault exception ]------------------------------- */
.org 0x300
_dispatch_do_dpage_fault:
// totaly disable timer interrupt
// l.mtspr r0,r0,SPR_TTMR
// DEBUG_TLB_PROBE(0x300)
// EXCEPTION_DEBUG_VALUE_ER_ENABLED(0x300)
EXCEPTION_HANDLE(_data_page_fault_handler)
/* ---[ 0x400: Insn Page Fault exception ]------------------------------- */
.org 0x400
_dispatch_do_ipage_fault:
// totaly disable timer interrupt
// l.mtspr r0,r0,SPR_TTMR
// DEBUG_TLB_PROBE(0x400)
// EXCEPTION_DEBUG_VALUE_ER_ENABLED(0x400)
EXCEPTION_HANDLE(_insn_page_fault_handler)
/* ---[ 0x500: Timer exception ]----------------------------------------- */
.org 0x500
EXCEPTION_HANDLE(_timer_handler)
/* ---[ 0x600: Aligment exception ]-------------------------------------- */
.org 0x600
EXCEPTION_HANDLE(_alignment_handler)
/* ---[ 0x700: Illegal insn exception ]---------------------------------- */
.org 0x700
EXCEPTION_HANDLE(_illegal_instruction_handler)
/* ---[ 0x800: External interrupt exception ]---------------------------- */
.org 0x800
EXCEPTION_HANDLE(_external_irq_handler)
/* ---[ 0x900: DTLB miss exception ]------------------------------------- */
.org 0x900
l.j boot_dtlb_miss_handler
l.nop
/* ---[ 0xa00: ITLB miss exception ]------------------------------------- */
.org 0xa00
l.j boot_itlb_miss_handler
l.nop
/* ---[ 0xb00: Range exception ]----------------------------------------- */
.org 0xb00
UNHANDLED_EXCEPTION(_vector_0xb00)
/* ---[ 0xc00: Syscall exception ]--------------------------------------- */
.org 0xc00
EXCEPTION_HANDLE(_sys_call_handler)
/* ---[ 0xd00: Trap exception ]------------------------------------------ */
.org 0xd00
UNHANDLED_EXCEPTION(_vector_0xd00)
/* ---[ 0xe00: Trap exception ]------------------------------------------ */
.org 0xe00
// UNHANDLED_EXCEPTION(_vector_0xe00)
EXCEPTION_HANDLE(_trap_handler)
/* ---[ 0xf00: Reserved exception ]-------------------------------------- */
.org 0xf00
UNHANDLED_EXCEPTION(_vector_0xf00)
/* ---[ 0x1000: Reserved exception ]------------------------------------- */
.org 0x1000
UNHANDLED_EXCEPTION(_vector_0x1000)
/* ---[ 0x1100: Reserved exception ]------------------------------------- */
.org 0x1100
UNHANDLED_EXCEPTION(_vector_0x1100)
/* ---[ 0x1200: Reserved exception ]------------------------------------- */
.org 0x1200
UNHANDLED_EXCEPTION(_vector_0x1200)
/* ---[ 0x1300: Reserved exception ]------------------------------------- */
.org 0x1300
UNHANDLED_EXCEPTION(_vector_0x1300)
/* ---[ 0x1400: Reserved exception ]------------------------------------- */
.org 0x1400
UNHANDLED_EXCEPTION(_vector_0x1400)
/* ---[ 0x1500: Reserved exception ]------------------------------------- */
.org 0x1500
UNHANDLED_EXCEPTION(_vector_0x1500)
/* ---[ 0x1600: Reserved exception ]------------------------------------- */
.org 0x1600
UNHANDLED_EXCEPTION(_vector_0x1600)
/* ---[ 0x1700: Reserved exception ]------------------------------------- */
.org 0x1700
UNHANDLED_EXCEPTION(_vector_0x1700)
/* ---[ 0x1800: Reserved exception ]------------------------------------- */
.org 0x1800
UNHANDLED_EXCEPTION(_vector_0x1800)
/* ---[ 0x1900: Reserved exception ]------------------------------------- */
.org 0x1900
UNHANDLED_EXCEPTION(_vector_0x1900)
/* ---[ 0x1a00: Reserved exception ]------------------------------------- */
.org 0x1a00
UNHANDLED_EXCEPTION(_vector_0x1a00)
/* ---[ 0x1b00: Reserved exception ]------------------------------------- */
.org 0x1b00
UNHANDLED_EXCEPTION(_vector_0x1b00)
/* ---[ 0x1c00: Reserved exception ]------------------------------------- */
.org 0x1c00
UNHANDLED_EXCEPTION(_vector_0x1c00)
/* ---[ 0x1d00: Reserved exception ]------------------------------------- */
.org 0x1d00
UNHANDLED_EXCEPTION(_vector_0x1d00)
/* ---[ 0x1e00: Reserved exception ]------------------------------------- */
.org 0x1e00
UNHANDLED_EXCEPTION(_vector_0x1e00)
/* ---[ 0x1f00: Reserved exception ]------------------------------------- */
.org 0x1f00
UNHANDLED_EXCEPTION(_vector_0x1f00)
.org 0x2000
/* ===================================================[ kernel start ]=== */
/* .text*/
/* This early stuff belongs in HEAD, but some of the functions below definitely
* don't... */
__HEAD
.global _start
_start:
/*
* ensure a deterministic start
*/
l.ori r3,r0,0x1
l.mtspr r0,r3,SPR_SR
CLEAR_GPR(r1)
CLEAR_GPR(r2)
CLEAR_GPR(r3)
CLEAR_GPR(r4)
CLEAR_GPR(r5)
CLEAR_GPR(r6)
CLEAR_GPR(r7)
CLEAR_GPR(r8)
CLEAR_GPR(r9)
CLEAR_GPR(r10)
CLEAR_GPR(r11)
CLEAR_GPR(r12)
CLEAR_GPR(r13)
CLEAR_GPR(r14)
CLEAR_GPR(r15)
CLEAR_GPR(r16)
CLEAR_GPR(r17)
CLEAR_GPR(r18)
CLEAR_GPR(r19)
CLEAR_GPR(r20)
CLEAR_GPR(r21)
CLEAR_GPR(r22)
CLEAR_GPR(r23)
CLEAR_GPR(r24)
CLEAR_GPR(r25)
CLEAR_GPR(r26)
CLEAR_GPR(r27)
CLEAR_GPR(r28)
CLEAR_GPR(r29)
CLEAR_GPR(r30)
CLEAR_GPR(r31)
/*
* set up initial ksp and current
*/
LOAD_SYMBOL_2_GPR(r1,init_thread_union+0x2000) // setup kernel stack
LOAD_SYMBOL_2_GPR(r10,init_thread_union) // setup current
tophys (r31,r10)
l.sw TI_KSP(r31), r1
l.ori r4,r0,0x0
/*
* .data contains initialized data,
* .bss contains uninitialized data - clear it up
*/
clear_bss:
LOAD_SYMBOL_2_GPR(r24, __bss_start)
LOAD_SYMBOL_2_GPR(r26, _end)
tophys(r28,r24)
tophys(r30,r26)
CLEAR_GPR(r24)
CLEAR_GPR(r26)
1:
l.sw (0)(r28),r0
l.sfltu r28,r30
l.bf 1b
l.addi r28,r28,4
enable_ic:
l.jal _ic_enable
l.nop
enable_dc:
l.jal _dc_enable
l.nop
flush_tlb:
/*
* I N V A L I D A T E T L B e n t r i e s
*/
LOAD_SYMBOL_2_GPR(r5,SPR_DTLBMR_BASE(0))
LOAD_SYMBOL_2_GPR(r6,SPR_ITLBMR_BASE(0))
l.addi r7,r0,128 /* Maximum number of sets */
1:
l.mtspr r5,r0,0x0
l.mtspr r6,r0,0x0
l.addi r5,r5,1
l.addi r6,r6,1
l.sfeq r7,r0
l.bnf 1b
l.addi r7,r7,-1
/* The MMU needs to be enabled before or32_early_setup is called */
enable_mmu:
/*
* enable dmmu & immu
* SR[5] = 0, SR[6] = 0, 6th and 7th bit of SR set to 0
*/
l.mfspr r30,r0,SPR_SR
l.movhi r28,hi(SPR_SR_DME | SPR_SR_IME)
l.ori r28,r28,lo(SPR_SR_DME | SPR_SR_IME)
l.or r30,r30,r28
l.mtspr r0,r30,SPR_SR
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
// reset the simulation counters
l.nop 5
LOAD_SYMBOL_2_GPR(r24, or32_early_setup)
l.jalr r24
l.nop
clear_regs:
/*
* clear all GPRS to increase determinism
*/
CLEAR_GPR(r2)
CLEAR_GPR(r3)
CLEAR_GPR(r4)
CLEAR_GPR(r5)
CLEAR_GPR(r6)
CLEAR_GPR(r7)
CLEAR_GPR(r8)
CLEAR_GPR(r9)
CLEAR_GPR(r11)
CLEAR_GPR(r12)
CLEAR_GPR(r13)
CLEAR_GPR(r14)
CLEAR_GPR(r15)
CLEAR_GPR(r16)
CLEAR_GPR(r17)
CLEAR_GPR(r18)
CLEAR_GPR(r19)
CLEAR_GPR(r20)
CLEAR_GPR(r21)
CLEAR_GPR(r22)
CLEAR_GPR(r23)
CLEAR_GPR(r24)
CLEAR_GPR(r25)
CLEAR_GPR(r26)
CLEAR_GPR(r27)
CLEAR_GPR(r28)
CLEAR_GPR(r29)
CLEAR_GPR(r30)
CLEAR_GPR(r31)
jump_start_kernel:
/*
* jump to kernel entry (start_kernel)
*/
LOAD_SYMBOL_2_GPR(r30, start_kernel)
l.jr r30
l.nop
/* ========================================[ cache ]=== */
/* aligment here so we don't change memory offsets with
* memory controler defined
*/
.align 0x2000
_ic_enable:
/* Check if IC present and skip enabling otherwise */
l.mfspr r24,r0,SPR_UPR
l.andi r26,r24,SPR_UPR_ICP
l.sfeq r26,r0
l.bf 9f
l.nop
/* Disable IC */
l.mfspr r6,r0,SPR_SR
l.addi r5,r0,-1
l.xori r5,r5,SPR_SR_ICE
l.and r5,r6,r5
l.mtspr r0,r5,SPR_SR
/* Establish cache block size
If BS=0, 16;
If BS=1, 32;
r14 contain block size
*/
l.mfspr r24,r0,SPR_ICCFGR
l.andi r26,r24,SPR_ICCFGR_CBS
l.srli r28,r26,7
l.ori r30,r0,16
l.sll r14,r30,r28
/* Establish number of cache sets
r16 contains number of cache sets
r28 contains log(# of cache sets)
*/
l.andi r26,r24,SPR_ICCFGR_NCS
l.srli r28,r26,3
l.ori r30,r0,1
l.sll r16,r30,r28
/* Invalidate IC */
l.addi r6,r0,0
l.sll r5,r14,r28
// l.mul r5,r14,r16
// l.trap 1
// l.addi r5,r0,IC_SIZE
1:
l.mtspr r0,r6,SPR_ICBIR
l.sfne r6,r5
l.bf 1b
l.add r6,r6,r14
// l.addi r6,r6,IC_LINE
/* Enable IC */
l.mfspr r6,r0,SPR_SR
l.ori r6,r6,SPR_SR_ICE
l.mtspr r0,r6,SPR_SR
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
l.nop
9:
l.jr r9
l.nop
_dc_enable:
/* Check if DC present and skip enabling otherwise */
l.mfspr r24,r0,SPR_UPR
l.andi r26,r24,SPR_UPR_DCP
l.sfeq r26,r0
l.bf 9f
l.nop
/* Disable DC */
l.mfspr r6,r0,SPR_SR
l.addi r5,r0,-1
l.xori r5,r5,SPR_SR_DCE
l.and r5,r6,r5
l.mtspr r0,r5,SPR_SR
/* Establish cache block size
If BS=0, 16;
If BS=1, 32;
r14 contain block size
*/
l.mfspr r24,r0,SPR_DCCFGR
l.andi r26,r24,SPR_DCCFGR_CBS
l.srli r28,r26,7
l.ori r30,r0,16
l.sll r14,r30,r28
/* Establish number of cache sets
r16 contains number of cache sets
r28 contains log(# of cache sets)
*/
l.andi r26,r24,SPR_DCCFGR_NCS
l.srli r28,r26,3
l.ori r30,r0,1
l.sll r16,r30,r28
/* Invalidate DC */
l.addi r6,r0,0
l.sll r5,r14,r28
1:
l.mtspr r0,r6,SPR_DCBIR
l.sfne r6,r5
l.bf 1b
l.add r6,r6,r14
/* Enable DC */
l.mfspr r6,r0,SPR_SR
l.ori r6,r6,SPR_SR_DCE
l.mtspr r0,r6,SPR_SR
9:
l.jr r9
l.nop
/* ===============================================[ page table masks ]=== */
/* bit 4 is used in hardware as write back cache bit. we never use this bit
* explicitly, so we can reuse it as _PAGE_FILE bit and mask it out when
* writing into hardware pte's
*/
#define DTLB_UP_CONVERT_MASK 0x3fa
#define ITLB_UP_CONVERT_MASK 0x3a
/* for SMP we'd have (this is a bit subtle, CC must be always set
* for SMP, but since we have _PAGE_PRESENT bit always defined
* we can just modify the mask)
*/
#define DTLB_SMP_CONVERT_MASK 0x3fb
#define ITLB_SMP_CONVERT_MASK 0x3b
/* ---[ boot dtlb miss handler ]----------------------------------------- */
boot_dtlb_miss_handler:
/* mask for DTLB_MR register: - (0) sets V (valid) bit,
* - (31-12) sets bits belonging to VPN (31-12)
*/
#define DTLB_MR_MASK 0xfffff001
/* mask for DTLB_TR register: - (2) sets CI (cache inhibit) bit,
* - (4) sets A (access) bit,
* - (5) sets D (dirty) bit,
* - (8) sets SRE (superuser read) bit
* - (9) sets SWE (superuser write) bit
* - (31-12) sets bits belonging to VPN (31-12)
*/
#define DTLB_TR_MASK 0xfffff332
/* These are for masking out the VPN/PPN value from the MR/TR registers...
* it's not the same as the PFN */
#define VPN_MASK 0xfffff000
#define PPN_MASK 0xfffff000
EXCEPTION_STORE_GPR6
#if 0
l.mfspr r6,r0,SPR_ESR_BASE //
l.andi r6,r6,SPR_SR_SM // are we in kernel mode ?
l.sfeqi r6,0 // r6 == 0x1 --> SM
l.bf exit_with_no_dtranslation //
l.nop
#endif
/* this could be optimized by moving storing of
* non r6 registers here, and jumping r6 restore
* if not in supervisor mode
*/
EXCEPTION_STORE_GPR2
EXCEPTION_STORE_GPR3
EXCEPTION_STORE_GPR4
EXCEPTION_STORE_GPR5
l.mfspr r4,r0,SPR_EEAR_BASE // get the offending EA
immediate_translation:
CLEAR_GPR(r6)
l.srli r3,r4,0xd // r3 <- r4 / 8192 (sets are relative to page size (8Kb) NOT VPN size (4Kb)
l.mfspr r6, r0, SPR_DMMUCFGR
l.andi r6, r6, SPR_DMMUCFGR_NTS
l.srli r6, r6, SPR_DMMUCFGR_NTS_OFF
l.ori r5, r0, 0x1
l.sll r5, r5, r6 // r5 = number DMMU sets
l.addi r6, r5, -1 // r6 = nsets mask
l.and r2, r3, r6 // r2 <- r3 % NSETS_MASK
l.or r6,r6,r4 // r6 <- r4
l.ori r6,r6,~(VPN_MASK) // r6 <- VPN :VPN .xfff - clear up lo(r6) to 0x**** *fff
l.movhi r5,hi(DTLB_MR_MASK) // r5 <- ffff:0000.x000
l.ori r5,r5,lo(DTLB_MR_MASK) // r5 <- ffff:1111.x001 - apply DTLB_MR_MASK
l.and r5,r5,r6 // r5 <- VPN :VPN .x001 - we have DTLBMR entry
l.mtspr r2,r5,SPR_DTLBMR_BASE(0) // set DTLBMR
/* set up DTLB with no translation for EA <= 0xbfffffff */
LOAD_SYMBOL_2_GPR(r6,0xbfffffff)
l.sfgeu r6,r4 // flag if r6 >= r4 (if 0xbfffffff >= EA)
l.bf 1f // goto out
l.and r3,r4,r4 // delay slot :: 24 <- r4 (if flag==1)
tophys(r3,r4) // r3 <- PA
1:
l.ori r3,r3,~(PPN_MASK) // r3 <- PPN :PPN .xfff - clear up lo(r6) to 0x**** *fff
l.movhi r5,hi(DTLB_TR_MASK) // r5 <- ffff:0000.x000
l.ori r5,r5,lo(DTLB_TR_MASK) // r5 <- ffff:1111.x330 - apply DTLB_MR_MASK
l.and r5,r5,r3 // r5 <- PPN :PPN .x330 - we have DTLBTR entry
l.mtspr r2,r5,SPR_DTLBTR_BASE(0) // set DTLBTR
EXCEPTION_LOAD_GPR6
EXCEPTION_LOAD_GPR5
EXCEPTION_LOAD_GPR4
EXCEPTION_LOAD_GPR3
EXCEPTION_LOAD_GPR2
l.rfe // SR <- ESR, PC <- EPC
exit_with_no_dtranslation:
/* EA out of memory or not in supervisor mode */
EXCEPTION_LOAD_GPR6
EXCEPTION_LOAD_GPR4
l.j _dispatch_bus_fault
/* ---[ boot itlb miss handler ]----------------------------------------- */
boot_itlb_miss_handler:
/* mask for ITLB_MR register: - sets V (valid) bit,
* - sets bits belonging to VPN (15-12)
*/
#define ITLB_MR_MASK 0xfffff001
/* mask for ITLB_TR register: - sets A (access) bit,
* - sets SXE (superuser execute) bit
* - sets bits belonging to VPN (15-12)
*/
#define ITLB_TR_MASK 0xfffff050
/*
#define VPN_MASK 0xffffe000
#define PPN_MASK 0xffffe000
*/
EXCEPTION_STORE_GPR2
EXCEPTION_STORE_GPR3
EXCEPTION_STORE_GPR4
EXCEPTION_STORE_GPR5
EXCEPTION_STORE_GPR6
#if 0
l.mfspr r6,r0,SPR_ESR_BASE //
l.andi r6,r6,SPR_SR_SM // are we in kernel mode ?
l.sfeqi r6,0 // r6 == 0x1 --> SM
l.bf exit_with_no_itranslation
l.nop
#endif
l.mfspr r4,r0,SPR_EEAR_BASE // get the offending EA
earlyearly:
CLEAR_GPR(r6)
l.srli r3,r4,0xd // r3 <- r4 / 8192 (sets are relative to page size (8Kb) NOT VPN size (4Kb)
l.mfspr r6, r0, SPR_IMMUCFGR
l.andi r6, r6, SPR_IMMUCFGR_NTS
l.srli r6, r6, SPR_IMMUCFGR_NTS_OFF
l.ori r5, r0, 0x1
l.sll r5, r5, r6 // r5 = number IMMU sets from IMMUCFGR
l.addi r6, r5, -1 // r6 = nsets mask
l.and r2, r3, r6 // r2 <- r3 % NSETS_MASK
l.or r6,r6,r4 // r6 <- r4
l.ori r6,r6,~(VPN_MASK) // r6 <- VPN :VPN .xfff - clear up lo(r6) to 0x**** *fff
l.movhi r5,hi(ITLB_MR_MASK) // r5 <- ffff:0000.x000
l.ori r5,r5,lo(ITLB_MR_MASK) // r5 <- ffff:1111.x001 - apply ITLB_MR_MASK
l.and r5,r5,r6 // r5 <- VPN :VPN .x001 - we have ITLBMR entry
l.mtspr r2,r5,SPR_ITLBMR_BASE(0) // set ITLBMR
/*
* set up ITLB with no translation for EA <= 0x0fffffff
*
* we need this for head.S mapping (EA = PA). if we move all functions
* which run with mmu enabled into entry.S, we might be able to eliminate this.
*
*/
LOAD_SYMBOL_2_GPR(r6,0x0fffffff)
l.sfgeu r6,r4 // flag if r6 >= r4 (if 0xb0ffffff >= EA)
l.bf 1f // goto out
l.and r3,r4,r4 // delay slot :: 24 <- r4 (if flag==1)
tophys(r3,r4) // r3 <- PA
1:
l.ori r3,r3,~(PPN_MASK) // r3 <- PPN :PPN .xfff - clear up lo(r6) to 0x**** *fff
l.movhi r5,hi(ITLB_TR_MASK) // r5 <- ffff:0000.x000
l.ori r5,r5,lo(ITLB_TR_MASK) // r5 <- ffff:1111.x050 - apply ITLB_MR_MASK
l.and r5,r5,r3 // r5 <- PPN :PPN .x050 - we have ITLBTR entry
l.mtspr r2,r5,SPR_ITLBTR_BASE(0) // set ITLBTR
EXCEPTION_LOAD_GPR6
EXCEPTION_LOAD_GPR5
EXCEPTION_LOAD_GPR4
EXCEPTION_LOAD_GPR3
EXCEPTION_LOAD_GPR2
l.rfe // SR <- ESR, PC <- EPC
exit_with_no_itranslation:
EXCEPTION_LOAD_GPR4
EXCEPTION_LOAD_GPR6
l.j _dispatch_bus_fault
l.nop
/* ====================================================================== */
/*
* Stuff below here shouldn't go into .head section... maybe this stuff
* can be moved to entry.S ???
*/
/* ==============================================[ DTLB miss handler ]=== */
/*
* Comments:
* Exception handlers are entered with MMU off so the following handler
* needs to use physical addressing
*
*/
.text
ENTRY(dtlb_miss_handler)
EXCEPTION_STORE_GPR2
EXCEPTION_STORE_GPR3
EXCEPTION_STORE_GPR4
EXCEPTION_STORE_GPR5
EXCEPTION_STORE_GPR6
/*
* get EA of the miss
*/
l.mfspr r2,r0,SPR_EEAR_BASE
/*
* pmd = (pmd_t *)(current_pgd + pgd_index(daddr));
*/
GET_CURRENT_PGD(r3,r5) // r3 is current_pgd, r5 is temp
l.srli r4,r2,0x18 // >> PAGE_SHIFT + (PAGE_SHIFT - 2)
l.slli r4,r4,0x2 // to get address << 2
l.add r5,r4,r3 // r4 is pgd_index(daddr)
/*
* if (pmd_none(*pmd))
* goto pmd_none:
*/
tophys (r4,r5)
l.lwz r3,0x0(r4) // get *pmd value
l.sfne r3,r0
l.bnf d_pmd_none
l.andi r3,r3,~PAGE_MASK //0x1fff // ~PAGE_MASK
/*
* if (pmd_bad(*pmd))
* pmd_clear(pmd)
* goto pmd_bad:
*/
// l.sfeq r3,r0 // check *pmd value
// l.bf d_pmd_good
l.addi r3,r0,0xffffe000 // PAGE_MASK
// l.j d_pmd_bad
// l.sw 0x0(r4),r0 // clear pmd
d_pmd_good:
/*
* pte = *pte_offset(pmd, daddr);
*/
l.lwz r4,0x0(r4) // get **pmd value
l.and r4,r4,r3 // & PAGE_MASK
l.srli r5,r2,0xd // >> PAGE_SHIFT, r2 == EEAR
l.andi r3,r5,0x7ff // (1UL << PAGE_SHIFT - 2) - 1
l.slli r3,r3,0x2 // to get address << 2
l.add r3,r3,r4
l.lwz r2,0x0(r3) // this is pte at last
/*
* if (!pte_present(pte))
*/
l.andi r4,r2,0x1
l.sfne r4,r0 // is pte present
l.bnf d_pte_not_present
l.addi r3,r0,0xffffe3fa // PAGE_MASK | DTLB_UP_CONVERT_MASK
/*
* fill DTLB TR register
*/
l.and r4,r2,r3 // apply the mask
// Determine number of DMMU sets
l.mfspr r6, r0, SPR_DMMUCFGR
l.andi r6, r6, SPR_DMMUCFGR_NTS
l.srli r6, r6, SPR_DMMUCFGR_NTS_OFF
l.ori r3, r0, 0x1
l.sll r3, r3, r6 // r3 = number DMMU sets DMMUCFGR
l.addi r6, r3, -1 // r6 = nsets mask
l.and r5, r5, r6 // calc offset: & (NUM_TLB_ENTRIES-1)
//NUM_TLB_ENTRIES
l.mtspr r5,r4,SPR_DTLBTR_BASE(0)
/*
* fill DTLB MR register
*/
l.mfspr r2,r0,SPR_EEAR_BASE
l.addi r3,r0,0xffffe000 // PAGE_MASK
l.and r4,r2,r3 // apply PAGE_MASK to EA (__PHX__ do we really need this?)
l.ori r4,r4,0x1 // set hardware valid bit: DTBL_MR entry
l.mtspr r5,r4,SPR_DTLBMR_BASE(0)
EXCEPTION_LOAD_GPR2
EXCEPTION_LOAD_GPR3
EXCEPTION_LOAD_GPR4
EXCEPTION_LOAD_GPR5
EXCEPTION_LOAD_GPR6
l.rfe
d_pmd_bad:
l.nop 1
EXCEPTION_LOAD_GPR2
EXCEPTION_LOAD_GPR3
EXCEPTION_LOAD_GPR4
EXCEPTION_LOAD_GPR5
EXCEPTION_LOAD_GPR6
l.rfe
d_pmd_none:
d_pte_not_present:
EXCEPTION_LOAD_GPR2
EXCEPTION_LOAD_GPR3
EXCEPTION_LOAD_GPR4
EXCEPTION_LOAD_GPR5
EXCEPTION_LOAD_GPR6
l.j _dispatch_do_dpage_fault
l.nop
/* ==============================================[ ITLB miss handler ]=== */
ENTRY(itlb_miss_handler)
EXCEPTION_STORE_GPR2
EXCEPTION_STORE_GPR3
EXCEPTION_STORE_GPR4
EXCEPTION_STORE_GPR5
EXCEPTION_STORE_GPR6
/*
* get EA of the miss
*/
l.mfspr r2,r0,SPR_EEAR_BASE
/*
* pmd = (pmd_t *)(current_pgd + pgd_index(daddr));
*
*/
GET_CURRENT_PGD(r3,r5) // r3 is current_pgd, r5 is temp
l.srli r4,r2,0x18 // >> PAGE_SHIFT + (PAGE_SHIFT - 2)
l.slli r4,r4,0x2 // to get address << 2
l.add r5,r4,r3 // r4 is pgd_index(daddr)
/*
* if (pmd_none(*pmd))
* goto pmd_none:
*/
tophys (r4,r5)
l.lwz r3,0x0(r4) // get *pmd value
l.sfne r3,r0
l.bnf i_pmd_none
l.andi r3,r3,0x1fff // ~PAGE_MASK
/*
* if (pmd_bad(*pmd))
* pmd_clear(pmd)
* goto pmd_bad:
*/
// l.sfeq r3,r0 // check *pmd value
// l.bf i_pmd_good
l.addi r3,r0,0xffffe000 // PAGE_MASK
// l.j i_pmd_bad
// l.sw 0x0(r4),r0 // clear pmd
i_pmd_good:
/*
* pte = *pte_offset(pmd, iaddr);
*
*/
l.lwz r4,0x0(r4) // get **pmd value
l.and r4,r4,r3 // & PAGE_MASK
l.srli r5,r2,0xd // >> PAGE_SHIFT, r2 == EEAR
l.andi r3,r5,0x7ff // (1UL << PAGE_SHIFT - 2) - 1
l.slli r3,r3,0x2 // to get address << 2
l.add r3,r3,r4
l.lwz r2,0x0(r3) // this is pte at last
/*
* if (!pte_present(pte))
*
*/
l.andi r4,r2,0x1
l.sfne r4,r0 // is pte present
l.bnf i_pte_not_present
l.addi r3,r0,0xffffe03a // PAGE_MASK | ITLB_UP_CONVERT_MASK
/*
* fill ITLB TR register
*/
l.and r4,r2,r3 // apply the mask
l.andi r3,r2,0x7c0 // _PAGE_EXEC | _PAGE_SRE | _PAGE_SWE | _PAGE_URE | _PAGE_UWE
// l.andi r3,r2,0x400 // _PAGE_EXEC
l.sfeq r3,r0
l.bf itlb_tr_fill //_workaround
// Determine number of IMMU sets
l.mfspr r6, r0, SPR_IMMUCFGR
l.andi r6, r6, SPR_IMMUCFGR_NTS
l.srli r6, r6, SPR_IMMUCFGR_NTS_OFF
l.ori r3, r0, 0x1
l.sll r3, r3, r6 // r3 = number IMMU sets IMMUCFGR
l.addi r6, r3, -1 // r6 = nsets mask
l.and r5, r5, r6 // calc offset: & (NUM_TLB_ENTRIES-1)
/*
* __PHX__ :: fixme
* we should not just blindly set executable flags,
* but it does help with ping. the clean way would be to find out
* (and fix it) why stack doesn't have execution permissions
*/
itlb_tr_fill_workaround:
l.ori r4,r4,0xc0 // | (SPR_ITLBTR_UXE | ITLBTR_SXE)
itlb_tr_fill:
l.mtspr r5,r4,SPR_ITLBTR_BASE(0)
/*
* fill DTLB MR register
*/
l.mfspr r2,r0,SPR_EEAR_BASE
l.addi r3,r0,0xffffe000 // PAGE_MASK
l.and r4,r2,r3 // apply PAGE_MASK to EA (__PHX__ do we really need this?)
l.ori r4,r4,0x1 // set hardware valid bit: DTBL_MR entry
l.mtspr r5,r4,SPR_ITLBMR_BASE(0)
EXCEPTION_LOAD_GPR2
EXCEPTION_LOAD_GPR3
EXCEPTION_LOAD_GPR4
EXCEPTION_LOAD_GPR5
EXCEPTION_LOAD_GPR6
l.rfe
i_pmd_bad:
l.nop 1
EXCEPTION_LOAD_GPR2
EXCEPTION_LOAD_GPR3
EXCEPTION_LOAD_GPR4
EXCEPTION_LOAD_GPR5
EXCEPTION_LOAD_GPR6
l.rfe
i_pmd_none:
i_pte_not_present:
EXCEPTION_LOAD_GPR2
EXCEPTION_LOAD_GPR3
EXCEPTION_LOAD_GPR4
EXCEPTION_LOAD_GPR5
EXCEPTION_LOAD_GPR6
l.j _dispatch_do_ipage_fault
l.nop
/* ==============================================[ boot tlb handlers ]=== */
/* =================================================[ debugging aids ]=== */
.align 64
_immu_trampoline:
.space 64
_immu_trampoline_top:
#define TRAMP_SLOT_0 (0x0)
#define TRAMP_SLOT_1 (0x4)
#define TRAMP_SLOT_2 (0x8)
#define TRAMP_SLOT_3 (0xc)
#define TRAMP_SLOT_4 (0x10)
#define TRAMP_SLOT_5 (0x14)
#define TRAMP_FRAME_SIZE (0x18)
ENTRY(_immu_trampoline_workaround)
// r2 EEA
// r6 is physical EEA
tophys(r6,r2)
LOAD_SYMBOL_2_GPR(r5,_immu_trampoline)
tophys (r3,r5) // r3 is trampoline (physical)
LOAD_SYMBOL_2_GPR(r4,0x15000000)
l.sw TRAMP_SLOT_0(r3),r4
l.sw TRAMP_SLOT_1(r3),r4
l.sw TRAMP_SLOT_4(r3),r4
l.sw TRAMP_SLOT_5(r3),r4
// EPC = EEA - 0x4
l.lwz r4,0x0(r6) // load op @ EEA + 0x0 (fc address)
l.sw TRAMP_SLOT_3(r3),r4 // store it to _immu_trampoline_data
l.lwz r4,-0x4(r6) // load op @ EEA - 0x4 (f8 address)
l.sw TRAMP_SLOT_2(r3),r4 // store it to _immu_trampoline_data
l.srli r5,r4,26 // check opcode for write access
l.sfeqi r5,0 // l.j
l.bf 0f
l.sfeqi r5,0x11 // l.jr
l.bf 1f
l.sfeqi r5,1 // l.jal
l.bf 2f
l.sfeqi r5,0x12 // l.jalr
l.bf 3f
l.sfeqi r5,3 // l.bnf
l.bf 4f
l.sfeqi r5,4 // l.bf
l.bf 5f
99:
l.nop
l.j 99b // should never happen
l.nop 1
// r2 is EEA
// r3 is trampoline address (physical)
// r4 is instruction
// r6 is physical(EEA)
//
// r5
2: // l.jal
/* 19 20 aa aa l.movhi r9,0xaaaa
* a9 29 bb bb l.ori r9,0xbbbb
*
* where 0xaaaabbbb is EEA + 0x4 shifted right 2
*/
l.addi r6,r2,0x4 // this is 0xaaaabbbb
// l.movhi r9,0xaaaa
l.ori r5,r0,0x1920 // 0x1920 == l.movhi r9
l.sh (TRAMP_SLOT_0+0x0)(r3),r5
l.srli r5,r6,16
l.sh (TRAMP_SLOT_0+0x2)(r3),r5
// l.ori r9,0xbbbb
l.ori r5,r0,0xa929 // 0xa929 == l.ori r9
l.sh (TRAMP_SLOT_1+0x0)(r3),r5
l.andi r5,r6,0xffff
l.sh (TRAMP_SLOT_1+0x2)(r3),r5
/* falthrough, need to set up new jump offset */
0: // l.j
l.slli r6,r4,6 // original offset shifted left 6 - 2
// l.srli r6,r6,6 // original offset shifted right 2
l.slli r4,r2,4 // old jump position: EEA shifted left 4
// l.srli r4,r4,6 // old jump position: shifted right 2
l.addi r5,r3,0xc // new jump position (physical)
l.slli r5,r5,4 // new jump position: shifted left 4
// calculate new jump offset
// new_off = old_off + (old_jump - new_jump)
l.sub r5,r4,r5 // old_jump - new_jump
l.add r5,r6,r5 // orig_off + (old_jump - new_jump)
l.srli r5,r5,6 // new offset shifted right 2
// r5 is new jump offset
// l.j has opcode 0x0...
l.sw TRAMP_SLOT_2(r3),r5 // write it back
l.j trampoline_out
l.nop
/* ----------------------------- */
3: // l.jalr
/* 19 20 aa aa l.movhi r9,0xaaaa
* a9 29 bb bb l.ori r9,0xbbbb
*
* where 0xaaaabbbb is EEA + 0x4 shifted right 2
*/
l.addi r6,r2,0x4 // this is 0xaaaabbbb
// l.movhi r9,0xaaaa
l.ori r5,r0,0x1920 // 0x1920 == l.movhi r9
l.sh (TRAMP_SLOT_0+0x0)(r3),r5
l.srli r5,r6,16
l.sh (TRAMP_SLOT_0+0x2)(r3),r5
// l.ori r9,0xbbbb
l.ori r5,r0,0xa929 // 0xa929 == l.ori r9
l.sh (TRAMP_SLOT_1+0x0)(r3),r5
l.andi r5,r6,0xffff
l.sh (TRAMP_SLOT_1+0x2)(r3),r5
l.lhz r5,(TRAMP_SLOT_2+0x0)(r3) // load hi part of jump instruction
l.andi r5,r5,0x3ff // clear out opcode part
l.ori r5,r5,0x4400 // opcode changed from l.jalr -> l.jr
l.sh (TRAMP_SLOT_2+0x0)(r3),r5 // write it back
/* falthrough */
1: // l.jr
l.j trampoline_out
l.nop
/* ----------------------------- */
4: // l.bnf
5: // l.bf
l.slli r6,r4,6 // original offset shifted left 6 - 2
// l.srli r6,r6,6 // original offset shifted right 2
l.slli r4,r2,4 // old jump position: EEA shifted left 4
// l.srli r4,r4,6 // old jump position: shifted right 2
l.addi r5,r3,0xc // new jump position (physical)
l.slli r5,r5,4 // new jump position: shifted left 4
// calculate new jump offset
// new_off = old_off + (old_jump - new_jump)
l.add r6,r6,r4 // (orig_off + old_jump)
l.sub r6,r6,r5 // (orig_off + old_jump) - new_jump
l.srli r6,r6,6 // new offset shifted right 2
// r6 is new jump offset
l.lwz r4,(TRAMP_SLOT_2+0x0)(r3) // load jump instruction
l.srli r4,r4,16
l.andi r4,r4,0xfc00 // get opcode part
l.slli r4,r4,16
l.or r6,r4,r6 // l.b(n)f new offset
l.sw TRAMP_SLOT_2(r3),r6 // write it back
/* we need to add l.j to EEA + 0x8 */
tophys (r4,r2) // may not be needed (due to shifts down_
l.addi r4,r4,(0x8 - 0x8) // jump target = r2 + 0x8 (compensate for 0x8)
// jump position = r5 + 0x8 (0x8 compensated)
l.sub r4,r4,r5 // jump offset = target - new_position + 0x8
l.slli r4,r4,4 // the amount of info in imediate of jump
l.srli r4,r4,6 // jump instruction with offset
l.sw TRAMP_SLOT_4(r3),r4 // write it to 4th slot
/* fallthrough */
trampoline_out:
// set up new EPC to point to our trampoline code
LOAD_SYMBOL_2_GPR(r5,_immu_trampoline)
l.mtspr r0,r5,SPR_EPCR_BASE
// immu_trampoline is (4x) CACHE_LINE aligned
// and only 6 instructions long,
// so we need to invalidate only 2 lines
/* Establish cache block size
If BS=0, 16;
If BS=1, 32;
r14 contain block size
*/
l.mfspr r21,r0,SPR_ICCFGR
l.andi r21,r21,SPR_ICCFGR_CBS
l.srli r21,r21,7
l.ori r23,r0,16
l.sll r14,r23,r21
l.mtspr r0,r5,SPR_ICBIR
l.add r5,r5,r14
l.mtspr r0,r5,SPR_ICBIR
l.jr r9
l.nop
/*
* DSCR: prints a string referenced by r3.
*
* PRMS: r3 - address of the first character of null
* terminated string to be printed
*
* PREQ: UART at UART_BASE_ADD has to be initialized
*
* POST: caller should be aware that r3, r9 are changed
*/
ENTRY(_emergency_print)
EMERGENCY_PRINT_STORE_GPR4
EMERGENCY_PRINT_STORE_GPR5
EMERGENCY_PRINT_STORE_GPR6
EMERGENCY_PRINT_STORE_GPR7
2:
l.lbz r7,0(r3)
l.sfeq r7,r0
l.bf 9f
l.nop
// putc:
l.movhi r4,hi(UART_BASE_ADD)
l.addi r6,r0,0x20
1: l.lbz r5,5(r4)
l.andi r5,r5,0x20
l.sfeq r5,r6
l.bnf 1b
l.nop
l.sb 0(r4),r7
l.addi r6,r0,0x60
1: l.lbz r5,5(r4)
l.andi r5,r5,0x60
l.sfeq r5,r6
l.bnf 1b
l.nop
/* next character */
l.j 2b
l.addi r3,r3,0x1
9:
EMERGENCY_PRINT_LOAD_GPR7
EMERGENCY_PRINT_LOAD_GPR6
EMERGENCY_PRINT_LOAD_GPR5
EMERGENCY_PRINT_LOAD_GPR4
l.jr r9
l.nop
ENTRY(_emergency_print_nr)
EMERGENCY_PRINT_STORE_GPR4
EMERGENCY_PRINT_STORE_GPR5
EMERGENCY_PRINT_STORE_GPR6
EMERGENCY_PRINT_STORE_GPR7
EMERGENCY_PRINT_STORE_GPR8
l.addi r8,r0,32 // shift register
1: /* remove leading zeros */
l.addi r8,r8,-0x4
l.srl r7,r3,r8
l.andi r7,r7,0xf
/* don't skip the last zero if number == 0x0 */
l.sfeqi r8,0x4
l.bf 2f
l.nop
l.sfeq r7,r0
l.bf 1b
l.nop
2:
l.srl r7,r3,r8
l.andi r7,r7,0xf
l.sflts r8,r0
l.bf 9f
l.sfgtui r7,0x9
l.bnf 8f
l.nop
l.addi r7,r7,0x27
8:
l.addi r7,r7,0x30
// putc:
l.movhi r4,hi(UART_BASE_ADD)
l.addi r6,r0,0x20
1: l.lbz r5,5(r4)
l.andi r5,r5,0x20
l.sfeq r5,r6
l.bnf 1b
l.nop
l.sb 0(r4),r7
l.addi r6,r0,0x60
1: l.lbz r5,5(r4)
l.andi r5,r5,0x60
l.sfeq r5,r6
l.bnf 1b
l.nop
/* next character */
l.j 2b
l.addi r8,r8,-0x4
9:
EMERGENCY_PRINT_LOAD_GPR8
EMERGENCY_PRINT_LOAD_GPR7
EMERGENCY_PRINT_LOAD_GPR6
EMERGENCY_PRINT_LOAD_GPR5
EMERGENCY_PRINT_LOAD_GPR4
l.jr r9
l.nop
/*
* This should be used for debugging only.
* It messes up the Linux early serial output
* somehow, so use it sparingly and essentially
* only if you need to debug something that goes wrong
* before Linux gets the early serial going.
*
* Furthermore, you'll have to make sure you set the
* UART_DEVISOR correctly according to the system
* clock rate.
*
*
*/
#define SYS_CLK 20000000
//#define SYS_CLK 1843200
#define OR32_CONSOLE_BAUD 115200
#define UART_DIVISOR SYS_CLK/(16*OR32_CONSOLE_BAUD)
ENTRY(_early_uart_init)
l.movhi r3,hi(UART_BASE_ADD)
l.addi r4,r0,0x7
l.sb 0x2(r3),r4
l.addi r4,r0,0x0
l.sb 0x1(r3),r4
l.addi r4,r0,0x3
l.sb 0x3(r3),r4
l.lbz r5,3(r3)
l.ori r4,r5,0x80
l.sb 0x3(r3),r4
l.addi r4,r0,((UART_DIVISOR>>8) & 0x000000ff)
l.sb UART_DLM(r3),r4
l.addi r4,r0,((UART_DIVISOR) & 0x000000ff)
l.sb UART_DLL(r3),r4
l.sb 0x3(r3),r5
l.jr r9
l.nop
_string_copying_linux:
.string "\n\n\n\n\n\rCopying Linux... \0"
_string_ok_booting:
.string "Ok, booting the kernel.\n\r\0"
_string_unhandled_exception:
.string "\n\rRunarunaround: Unhandled exception 0x\0"
_string_epc_prefix:
.string ": EPC=0x\0"
_string_nl:
.string "\n\r\0"
.global _string_esr_irq_bug
_string_esr_irq_bug:
.string "\n\rESR external interrupt bug, for details look into entry.S\n\r\0"
/* ========================================[ page aligned structures ]=== */
/*
* .data section should be page aligned
* (look into arch/or32/kernel/vmlinux.lds)
*/
.section .data,"aw"
.align 8192
.global empty_zero_page
empty_zero_page:
.space 8192
.global swapper_pg_dir
swapper_pg_dir:
.space 8192
.global _unhandled_stack
_unhandled_stack:
.space 8192
_unhandled_stack_top:
/* ============================================================[ EOF ]=== */
arch/openrisc/kernel/init_task.c 0 → 100644
View file @ 9d02a428
/*
* OpenRISC init_task.c
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* Modifications for the OpenRISC architecture:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/init_task.h>
#include <linux/mqueue.h>
static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
/*
* Initial thread structure.
*
* We need to make sure that this is THREAD_SIZE aligned due to the
* way process stacks are handled. This is done by having a special
* "init_task" linker map entry..
*/
union thread_union init_thread_union __init_task_data = {
INIT_THREAD_INFO(init_task)
};
/*
* Initial task structure.
*
* All other task structs will be allocated on slabs in fork.c
*/
struct task_struct init_task = INIT_TASK(init_task);
EXPORT_SYMBOL(init_task);
arch/openrisc/kernel/setup.c 0 → 100644
View file @ 9d02a428
/*
* OpenRISC setup.c
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* Modifications for the OpenRISC architecture:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* This file handles the architecture-dependent parts of initialization
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/serial.h>
#include <linux/initrd.h>
#include <linux/of_fdt.h>
#include <linux/of.h>
#include <linux/memblock.h>
#include <linux/device.h>
#include <linux/of_platform.h>
#include <asm/segment.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/types.h>
#include <asm/setup.h>
#include <asm/io.h>
#include <asm/cpuinfo.h>
#include <asm/delay.h>
#include "vmlinux.h"
char __initdata cmd_line[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
static unsigned long __init setup_memory(void)
{
unsigned long bootmap_size;
unsigned long ram_start_pfn;
unsigned long free_ram_start_pfn;
unsigned long ram_end_pfn;
phys_addr_t memory_start, memory_end;
struct memblock_region *region;
memory_end = memory_start = 0;
/* Find main memory where is the kernel */
for_each_memblock(memory, region) {
memory_start = region->base;
memory_end = region->base + region->size;
printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
memory_start, memory_end);
}
if (!memory_end) {
panic("No memory!");
}
ram_start_pfn = PFN_UP(memory_start);
/* free_ram_start_pfn is first page after kernel */
free_ram_start_pfn = PFN_UP(__pa(&_end));
ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
max_pfn = ram_end_pfn;
/*
* initialize the boot-time allocator (with low memory only).
*
* This makes the memory from the end of the kernel to the end of
* RAM usable.
* init_bootmem sets the global values min_low_pfn, max_low_pfn.
*/
bootmap_size = init_bootmem(free_ram_start_pfn,
ram_end_pfn - ram_start_pfn);
free_bootmem(PFN_PHYS(free_ram_start_pfn),
(ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT);
reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size,
BOOTMEM_DEFAULT);
for_each_memblock(reserved, region) {
printk(KERN_INFO "Reserved - 0x%08x-0x%08x\n",
(u32) region->base, (u32) region->size);
reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT);
}
return ram_end_pfn;
}
struct cpuinfo cpuinfo;
static void print_cpuinfo(void)
{
unsigned long upr = mfspr(SPR_UPR);
unsigned long vr = mfspr(SPR_VR);
unsigned int version;
unsigned int revision;
version = (vr & SPR_VR_VER) >> 24;
revision = (vr & SPR_VR_REV);
printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n",
version, revision, cpuinfo.clock_frequency / 1000000);
if (!(upr & SPR_UPR_UP)) {
printk(KERN_INFO
"-- no UPR register... unable to detect configuration\n");
return;
}
if (upr & SPR_UPR_DCP)
printk(KERN_INFO
"-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n",
cpuinfo.dcache_size, cpuinfo.dcache_block_size, 1);
else
printk(KERN_INFO "-- dcache disabled\n");
if (upr & SPR_UPR_ICP)
printk(KERN_INFO
"-- icache: %4d bytes total, %2d bytes/line, %d way(s)\n",
cpuinfo.icache_size, cpuinfo.icache_block_size, 1);
else
printk(KERN_INFO "-- icache disabled\n");
if (upr & SPR_UPR_DMP)
printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n",
1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
if (upr & SPR_UPR_IMP)
printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n",
1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
printk(KERN_INFO "-- additional features:\n");
if (upr & SPR_UPR_DUP)
printk(KERN_INFO "-- debug unit\n");
if (upr & SPR_UPR_PCUP)
printk(KERN_INFO "-- performance counters\n");
if (upr & SPR_UPR_PMP)
printk(KERN_INFO "-- power management\n");
if (upr & SPR_UPR_PICP)
printk(KERN_INFO "-- PIC\n");
if (upr & SPR_UPR_TTP)
printk(KERN_INFO "-- timer\n");
if (upr & SPR_UPR_CUP)
printk(KERN_INFO "-- custom unit(s)\n");
}
void __init setup_cpuinfo(void)
{
struct device_node *cpu;
unsigned long iccfgr, dccfgr;
unsigned long cache_set_size, cache_ways;
cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
if (!cpu)
panic("No compatible CPU found in device tree...\n");
iccfgr = mfspr(SPR_ICCFGR);
cache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
cpuinfo.icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7);
cpuinfo.icache_size =
cache_set_size * cache_ways * cpuinfo.icache_block_size;
dccfgr = mfspr(SPR_DCCFGR);
cache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
cpuinfo.dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7);
cpuinfo.dcache_size =
cache_set_size * cache_ways * cpuinfo.dcache_block_size;
if (of_property_read_u32(cpu, "clock-frequency",
&cpuinfo.clock_frequency)) {
printk(KERN_WARNING
"Device tree missing CPU 'clock-frequency' parameter."
"Assuming frequency 25MHZ"
"This is probably not what you want.");
}
of_node_put(cpu);
print_cpuinfo();
}
/**
* or32_early_setup
*
* Handles the pointer to the device tree that this kernel is to use
* for establishing the available platform devices.
*
* For now, this is limited to using the built-in device tree. In the future,
* it is intended that this function will take a pointer to the device tree
* that is potentially built-in, but potentially also passed in by the
* bootloader, or discovered by some equally clever means...
*/
void __init or32_early_setup(void)
{
early_init_devtree(__dtb_start);
printk(KERN_INFO "Compiled-in FDT at 0x%p\n", __dtb_start);
}
static int __init openrisc_device_probe(void)
{
of_platform_populate(NULL, NULL, NULL, NULL);
return 0;
}
device_initcall(openrisc_device_probe);
static inline unsigned long extract_value_bits(unsigned long reg,
short bit_nr, short width)
{
return (reg >> bit_nr) & (0 << width);
}
static inline unsigned long extract_value(unsigned long reg, unsigned long mask)
{
while (!(mask & 0x1)) {
reg = reg >> 1;
mask = mask >> 1;
}
return mask & reg;
}
void __init detect_unit_config(unsigned long upr, unsigned long mask,
char *text, void (*func) (void))
{
if (text != NULL)
printk("%s", text);
if (upr & mask) {
if (func != NULL)
func();
else
printk("present\n");
} else
printk("not present\n");
}
/*
* calibrate_delay
*
* Lightweight calibrate_delay implementation that calculates loops_per_jiffy
* from the clock frequency passed in via the device tree
*
*/
void __cpuinit calibrate_delay(void)
{
const int *val;
struct device_node *cpu = NULL;
cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
val = of_get_property(cpu, "clock-frequency", NULL);
if (!val)
panic("no cpu 'clock-frequency' parameter in device tree");
loops_per_jiffy = *val / HZ;
pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
loops_per_jiffy / (500000 / HZ),
(loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
}
void __init setup_arch(char **cmdline_p)
{
unsigned long max_low_pfn;
unflatten_device_tree();
setup_cpuinfo();
/* process 1's initial memory region is the kernel code/data */
init_mm.start_code = (unsigned long)&_stext;
init_mm.end_code = (unsigned long)&_etext;
init_mm.end_data = (unsigned long)&_edata;
init_mm.brk = (unsigned long)&_end;
#ifdef CONFIG_BLK_DEV_INITRD
initrd_start = (unsigned long)&__initrd_start;
initrd_end = (unsigned long)&__initrd_end;
if (initrd_start == initrd_end) {
initrd_start = 0;
initrd_end = 0;
}
initrd_below_start_ok = 1;
#endif
/* setup bootmem allocator */
max_low_pfn = setup_memory();
/* paging_init() sets up the MMU and marks all pages as reserved */
paging_init();
#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
if (!conswitchp)
conswitchp = &dummy_con;
#endif
*cmdline_p = cmd_line;
printk(KERN_INFO "OpenRISC Linux -- http://openrisc.net\n");
}
static int show_cpuinfo(struct seq_file *m, void *v)
{
unsigned long vr;
int version, revision;
vr = mfspr(SPR_VR);
version = (vr & SPR_VR_VER) >> 24;
revision = vr & SPR_VR_REV;
return seq_printf(m,
"cpu\t\t: OpenRISC-%x\n"
"revision\t: %d\n"
"frequency\t: %ld\n"
"dcache size\t: %d bytes\n"
"dcache block size\t: %d bytes\n"
"icache size\t: %d bytes\n"
"icache block size\t: %d bytes\n"
"immu\t\t: %d entries, %lu ways\n"
"dmmu\t\t: %d entries, %lu ways\n"
"bogomips\t: %lu.%02lu\n",
version,
revision,
loops_per_jiffy * HZ,
cpuinfo.dcache_size,
cpuinfo.dcache_block_size,
cpuinfo.icache_size,
cpuinfo.icache_block_size,
1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW),
1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW),
(loops_per_jiffy * HZ) / 500000,
((loops_per_jiffy * HZ) / 5000) % 100);
}
static void *c_start(struct seq_file *m, loff_t * pos)
{
/* We only have one CPU... */
return *pos < 1 ? (void *)1 : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t * pos)
{
++*pos;
return NULL;
}
static void c_stop(struct seq_file *m, void *v)
{
}
const struct seq_operations cpuinfo_op = {
.start = c_start,
.next = c_next,
.stop = c_stop,
.show = show_cpuinfo,
};
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