Merge branch 'for-linus' of git://git.monstr.eu/linux-2.6-microblaze

* 'for-linus' of git://git.monstr.eu/linux-2.6-microblaze: (35 commits)
  microblaze: Support word copying in copy_tofrom_user
  microblaze: Print early printk information to log buffer
  microblaze: head.S typo fix
  microblaze: Use MICROBLAZE_TLB_SIZE in asm code
  microblaze: Kconfig Fix - pci
  microblaze: Adding likely macros
  microblaze: Add .type and .size to ASM functions
  microblaze: Fix TLB macros
  microblaze: Use instruction with delay slot
  microblaze: Remove additional resr and rear loading
  microblaze: Change register usage for ESR and EAR
  microblaze: Prepare work for optimization in exception code
  microblaze: Add DEBUG option
  microblaze: Support systems without lmb bram
  microblaze: uaccess: Sync strlen, strnlen, copy_to/from_user
  microblaze: uaccess: Unify __copy_tofrom_user
  microblaze: uaccess: Move functions to generic location
  microblaze: uaccess: Fix put_user for noMMU
  microblaze: uaccess: Fix get_user macro for noMMU
  microblaze: uaccess: fix clear_user for noMMU kernel
  ...

arch/microblaze/Kconfig

@@ -75,9 +75,6 @@ config LOCKDEP_SUPPORT
 config HAVE_LATENCYTOP_SUPPORT
 	def_bool y
 
-config PCI
-	def_bool n
-
 config DTC
 	def_bool y
 

arch/microblaze/Makefile

@@ -84,7 +84,7 @@ define archhelp
   echo '* linux.bin    - Create raw binary'
   echo '  linux.bin.gz - Create compressed raw binary'
   echo '  simpleImage.<dt> - ELF image with $(arch)/boot/dts/<dt>.dts linked in'
-  echo '                   - stripped elf with fdt blob
+  echo '                   - stripped elf with fdt blob'
   echo '  simpleImage.<dt>.unstrip - full ELF image with fdt blob'
   echo '  *_defconfig      - Select default config from arch/microblaze/configs'
   echo ''
@@ -94,3 +94,5 @@ define archhelp
   echo '  name of a dts file from the arch/microblaze/boot/dts/ directory'
   echo '  (minus the .dts extension).'
 endef
+
+MRPROPER_FILES += $(boot)/simpleImage.*

arch/microblaze/boot/Makefile

@@ -23,8 +23,6 @@ $(obj)/system.dtb: $(obj)/$(DTB).dtb
 endif
 
 $(obj)/linux.bin: vmlinux FORCE
-	[ -n $(CONFIG_INITRAMFS_SOURCE) ] && [ ! -e $(CONFIG_INITRAMFS_SOURCE) ] && \
-	touch $(CONFIG_INITRAMFS_SOURCE) || echo "No CPIO image"
 	$(call if_changed,objcopy)
 	$(call if_changed,uimage)
 	@echo 'Kernel: $@ is ready' ' (#'`cat .version`')'
@@ -62,6 +60,4 @@ quiet_cmd_dtc = DTC     $@
 $(obj)/%.dtb: $(dtstree)/%.dts FORCE
 	$(call if_changed,dtc)
 
-clean-kernel += linux.bin linux.bin.gz simpleImage.*
-
-clean-files += *.dtb simpleImage.*.unstrip
+clean-files += *.dtb simpleImage.*.unstrip linux.bin.ub

arch/microblaze/include/asm/processor.h

@@ -14,7 +14,6 @@
 #include <asm/ptrace.h>
 #include <asm/setup.h>
 #include <asm/registers.h>
-#include <asm/segment.h>
 #include <asm/entry.h>
 #include <asm/current.h>
 

arch/microblaze/include/asm/segment.h

-/*
- * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
- * Copyright (C) 2008-2009 PetaLogix
- * Copyright (C) 2006 Atmark Techno, Inc.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-
-#ifndef _ASM_MICROBLAZE_SEGMENT_H
-#define _ASM_MICROBLAZE_SEGMENT_H
-
-# ifndef __ASSEMBLY__
-
-typedef struct {
-	unsigned long seg;
-} mm_segment_t;
-
-/*
- * On Microblaze the fs value is actually the top of the corresponding
- * address space.
- *
- * The fs value determines whether argument validity checking should be
- * performed or not. If get_fs() == USER_DS, checking is performed, with
- * get_fs() == KERNEL_DS, checking is bypassed.
- *
- * For historical reasons, these macros are grossly misnamed.
- *
- * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
- */
-# define MAKE_MM_SEG(s)       ((mm_segment_t) { (s) })
-
-#  ifndef CONFIG_MMU
-#  define KERNEL_DS	MAKE_MM_SEG(0)
-#  define USER_DS	KERNEL_DS
-#  else
-#  define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFF)
-#  define USER_DS	MAKE_MM_SEG(TASK_SIZE - 1)
-#  endif
-
-# define get_ds()	(KERNEL_DS)
-# define get_fs()	(current_thread_info()->addr_limit)
-# define set_fs(val)	(current_thread_info()->addr_limit = (val))
-
-# define segment_eq(a, b)	((a).seg == (b).seg)
-
-# endif /* __ASSEMBLY__ */
-#endif /* _ASM_MICROBLAZE_SEGMENT_H */

arch/microblaze/include/asm/thread_info.h

@@ -19,7 +19,6 @@
 #ifndef __ASSEMBLY__
 # include <linux/types.h>
 # include <asm/processor.h>
-# include <asm/segment.h>
 
 /*
  * low level task data that entry.S needs immediate access to
@@ -60,6 +59,10 @@ struct cpu_context {
 	__u32	fsr;
 };
 
+typedef struct {
+	unsigned long seg;
+} mm_segment_t;
+
 struct thread_info {
 	struct task_struct	*task; /* main task structure */
 	struct exec_domain	*exec_domain; /* execution domain */

arch/microblaze/include/asm/tlbflush.h

@@ -24,6 +24,7 @@ extern void _tlbie(unsigned long address);
 extern void _tlbia(void);
 
 #define __tlbia()	{ preempt_disable(); _tlbia(); preempt_enable(); }
+#define __tlbie(x)	{ _tlbie(x); }
 
 static inline void local_flush_tlb_all(void)
 	{ __tlbia(); }
@@ -31,7 +32,7 @@ static inline void local_flush_tlb_mm(struct mm_struct *mm)
 	{ __tlbia(); }
 static inline void local_flush_tlb_page(struct vm_area_struct *vma,
 				unsigned long vmaddr)
-	{ _tlbie(vmaddr); }
+	{ __tlbie(vmaddr); }
 static inline void local_flush_tlb_range(struct vm_area_struct *vma,
 		unsigned long start, unsigned long end)
 	{ __tlbia(); }

arch/microblaze/kernel/dma.c

@@ -37,7 +37,7 @@ static inline void __dma_sync_page(unsigned long paddr, unsigned long offset,
 
 static unsigned long get_dma_direct_offset(struct device *dev)
 {
-	if (dev)
+	if (likely(dev))
 		return (unsigned long)dev->archdata.dma_data;
 
 	return PCI_DRAM_OFFSET; /* FIXME Not sure if is correct */

arch/microblaze/kernel/head.S

@@ -51,6 +51,12 @@ swapper_pg_dir:
 
 	.text
 ENTRY(_start)
+#if CONFIG_KERNEL_BASE_ADDR == 0
+	brai	TOPHYS(real_start)
+	.org	0x100
+real_start:
+#endif
+
 	mfs	r1, rmsr
 	andi	r1, r1, ~2
 	mts	rmsr, r1
@@ -99,8 +105,8 @@ no_fdt_arg:
 	tophys(r4,r4)			/* convert to phys address */
 	ori	r3, r0, COMMAND_LINE_SIZE - 1 /* number of loops */
 _copy_command_line:
-	lbu	r2, r5, r6 /* r7=r5+r6 - r5 contain pointer to command line */
-	sb	r2, r4, r6		/* addr[r4+r6]= r7*/
+	lbu	r2, r5, r6 /* r2=r5+r6 - r5 contain pointer to command line */
+	sb	r2, r4, r6		/* addr[r4+r6]= r2*/
 	addik	r6, r6, 1		/* increment counting */
 	bgtid	r3, _copy_command_line	/* loop for all entries       */
 	addik	r3, r3, -1		/* descrement loop */
@@ -128,7 +134,7 @@ _copy_bram:
 	 * virtual to physical.
 	 */
 	nop
-	addik	r3, r0, 63		/* Invalidate all TLB entries */
+	addik	r3, r0, MICROBLAZE_TLB_SIZE -1	/* Invalidate all TLB entries */
 _invalidate:
 	mts	rtlbx, r3
 	mts	rtlbhi, r0			/* flush: ensure V is clear   */

arch/microblaze/kernel/hw_exception_handler.S

@@ -313,13 +313,13 @@ _hw_exception_handler:
 	mfs	r5, rmsr;
 	nop
 	swi	r5, r1, 0;
-	mfs	r3, resr
+	mfs	r4, resr
 	nop
-	mfs	r4, rear;
+	mfs	r3, rear;
 	nop
 
 #ifndef CONFIG_MMU
-	andi	r5, r3, 0x1000;		/* Check ESR[DS] */
+	andi	r5, r4, 0x1000;		/* Check ESR[DS] */
 	beqi	r5, not_in_delay_slot;	/* Branch if ESR[DS] not set */
 	mfs	r17, rbtr;	/* ESR[DS] set - return address in BTR */
 	nop
@@ -327,13 +327,14 @@ not_in_delay_slot:
 	swi	r17, r1, PT_R17
 #endif
 
-	andi	r5, r3, 0x1F;		/* Extract ESR[EXC] */
+	andi	r5, r4, 0x1F;		/* Extract ESR[EXC] */
 
 #ifdef CONFIG_MMU
 	/* Calculate exception vector offset = r5 << 2 */
 	addk	r6, r5, r5; /* << 1 */
 	addk	r6, r6, r6; /* << 2 */
 
+#ifdef DEBUG
 /* counting which exception happen */
 	lwi	r5, r0, 0x200 + TOPHYS(r0_ram)
 	addi	r5, r5, 1
@@ -341,6 +342,7 @@ not_in_delay_slot:
 	lwi	r5, r6, 0x200 + TOPHYS(r0_ram)
 	addi	r5, r5, 1
 	swi	r5, r6, 0x200 + TOPHYS(r0_ram)
+#endif
 /* end */
 	/* Load the HW Exception vector */
 	lwi	r6, r6, TOPHYS(_MB_HW_ExceptionVectorTable)
@@ -376,7 +378,7 @@ handle_other_ex: /* Handle Other exceptions here */
 	swi	r18, r1, PT_R18
 
 	or	r5, r1, r0
-	andi	r6, r3, 0x1F; /* Load ESR[EC] */
+	andi	r6, r4, 0x1F; /* Load ESR[EC] */
 	lwi	r7, r0, PER_CPU(KM) /* MS: saving current kernel mode to regs */
 	swi	r7, r1, PT_MODE
 	mfs	r7, rfsr
@@ -426,11 +428,11 @@ handle_other_ex: /* Handle Other exceptions here */
  */
 handle_unaligned_ex:
 	/* Working registers already saved: R3, R4, R5, R6
-	 *  R3 = ESR
-	 *  R4 = EAR
+	 *  R4 = ESR
+	 *  R3 = EAR
 	 */
 #ifdef CONFIG_MMU
-	andi	r6, r3, 0x1000			/* Check ESR[DS] */
+	andi	r6, r4, 0x1000			/* Check ESR[DS] */
 	beqi	r6, _no_delayslot		/* Branch if ESR[DS] not set */
 	mfs	r17, rbtr;	/* ESR[DS] set - return address in BTR */
 	nop
@@ -439,7 +441,7 @@ _no_delayslot:
 	RESTORE_STATE;
 	bri	unaligned_data_trap
 #endif
-	andi	r6, r3, 0x3E0; /* Mask and extract the register operand */
+	andi	r6, r4, 0x3E0; /* Mask and extract the register operand */
 	srl	r6, r6; /* r6 >> 5 */
 	srl	r6, r6;
 	srl	r6, r6;
@@ -448,33 +450,33 @@ _no_delayslot:
 	/* Store the register operand in a temporary location */
 	sbi	r6, r0, TOPHYS(ex_reg_op);
 
-	andi	r6, r3, 0x400; /* Extract ESR[S] */
+	andi	r6, r4, 0x400; /* Extract ESR[S] */
 	bnei	r6, ex_sw;
 ex_lw:
-	andi	r6, r3, 0x800; /* Extract ESR[W] */
+	andi	r6, r4, 0x800; /* Extract ESR[W] */
 	beqi	r6, ex_lhw;
-	lbui	r5, r4, 0; /* Exception address in r4 */
+	lbui	r5, r3, 0; /* Exception address in r3 */
 	/* Load a word, byte-by-byte from destination address
 		and save it in tmp space */
 	sbi	r5, r0, TOPHYS(ex_tmp_data_loc_0);
-	lbui	r5, r4, 1;
+	lbui	r5, r3, 1;
 	sbi	r5, r0, TOPHYS(ex_tmp_data_loc_1);
-	lbui	r5, r4, 2;
+	lbui	r5, r3, 2;
 	sbi	r5, r0, TOPHYS(ex_tmp_data_loc_2);
-	lbui	r5, r4, 3;
+	lbui	r5, r3, 3;
 	sbi	r5, r0, TOPHYS(ex_tmp_data_loc_3);
-	/* Get the destination register value into r3 */
-	lwi	r3, r0, TOPHYS(ex_tmp_data_loc_0);
+	/* Get the destination register value into r4 */
+	lwi	r4, r0, TOPHYS(ex_tmp_data_loc_0);
 	bri	ex_lw_tail;
 ex_lhw:
-	lbui	r5, r4, 0; /* Exception address in r4 */
+	lbui	r5, r3, 0; /* Exception address in r3 */
 	/* Load a half-word, byte-by-byte from destination
 		address and save it in tmp space */
 	sbi	r5, r0, TOPHYS(ex_tmp_data_loc_0);
-	lbui	r5, r4, 1;
+	lbui	r5, r3, 1;
 	sbi	r5, r0, TOPHYS(ex_tmp_data_loc_1);
-	/* Get the destination register value into r3 */
-	lhui	r3, r0, TOPHYS(ex_tmp_data_loc_0);
+	/* Get the destination register value into r4 */
+	lhui	r4, r0, TOPHYS(ex_tmp_data_loc_0);
 ex_lw_tail:
 	/* Get the destination register number into r5 */
 	lbui	r5, r0, TOPHYS(ex_reg_op);
@@ -502,25 +504,25 @@ ex_sw_tail:
 	andi	r6, r6, 0x800; /* Extract ESR[W] */
 	beqi	r6, ex_shw;
 	/* Get the word - delay slot */
-	swi	r3, r0, TOPHYS(ex_tmp_data_loc_0);
+	swi	r4, r0, TOPHYS(ex_tmp_data_loc_0);
 	/* Store the word, byte-by-byte into destination address */
-	lbui	r3, r0, TOPHYS(ex_tmp_data_loc_0);
-	sbi	r3, r4, 0;
-	lbui	r3, r0, TOPHYS(ex_tmp_data_loc_1);
-	sbi	r3, r4, 1;
-	lbui	r3, r0, TOPHYS(ex_tmp_data_loc_2);
-	sbi	r3, r4, 2;
-	lbui	r3, r0, TOPHYS(ex_tmp_data_loc_3);
-	sbi	r3, r4, 3;
+	lbui	r4, r0, TOPHYS(ex_tmp_data_loc_0);
+	sbi	r4, r3, 0;
+	lbui	r4, r0, TOPHYS(ex_tmp_data_loc_1);
+	sbi	r4, r3, 1;
+	lbui	r4, r0, TOPHYS(ex_tmp_data_loc_2);
+	sbi	r4, r3, 2;
+	lbui	r4, r0, TOPHYS(ex_tmp_data_loc_3);
+	sbi	r4, r3, 3;
 	bri	ex_handler_done;
 
 ex_shw:
 	/* Store the lower half-word, byte-by-byte into destination address */
-	swi	r3, r0, TOPHYS(ex_tmp_data_loc_0);
-	lbui	r3, r0, TOPHYS(ex_tmp_data_loc_2);
-	sbi	r3, r4, 0;
-	lbui	r3, r0, TOPHYS(ex_tmp_data_loc_3);
-	sbi	r3, r4, 1;
+	swi	r4, r0, TOPHYS(ex_tmp_data_loc_0);
+	lbui	r4, r0, TOPHYS(ex_tmp_data_loc_2);
+	sbi	r4, r3, 0;
+	lbui	r4, r0, TOPHYS(ex_tmp_data_loc_3);
+	sbi	r4, r3, 1;
 ex_sw_end: /* Exception handling of store word, ends. */
 
 ex_handler_done:
@@ -560,21 +562,16 @@ ex_handler_done:
 		 */
 		mfs	r11, rpid
 		nop
-		bri	4
-		mfs	r3, rear		/* Get faulting address */
-		nop
 		/* If we are faulting a kernel address, we have to use the
 		 * kernel page tables.
 		 */
-		ori	r4, r0, CONFIG_KERNEL_START
-		cmpu	r4, r3, r4
-		bgti	r4, ex3
+		ori	r5, r0, CONFIG_KERNEL_START
+		cmpu	r5, r3, r5
+		bgti	r5, ex3
 		/* First, check if it was a zone fault (which means a user
 		 * tried to access a kernel or read-protected page - always
 		 * a SEGV). All other faults here must be stores, so no
 		 * need to check ESR_S as well. */
-		mfs	r4, resr
-		nop
 		andi	r4, r4, 0x800		/* ESR_Z - zone protection */
 		bnei	r4, ex2
 
@@ -589,8 +586,6 @@ ex_handler_done:
 		 * tried to access a kernel or read-protected page - always
 		 * a SEGV). All other faults here must be stores, so no
 		 * need to check ESR_S as well. */
-		mfs	r4, resr
-		nop
 		andi	r4, r4, 0x800		/* ESR_Z */
 		bnei	r4, ex2
 		/* get current task address */
@@ -665,8 +660,6 @@ ex_handler_done:
 		 * R3 = ESR
 		 */
 
-		mfs	r3, rear		/* Get faulting address */
-		nop
 		RESTORE_STATE;
 		bri	page_fault_instr_trap
 
@@ -677,18 +670,15 @@ ex_handler_done:
 	 */
 	handle_data_tlb_miss_exception:
 		/* Working registers already saved: R3, R4, R5, R6
-		 * R3 = ESR
+		 * R3 = EAR, R4 = ESR
 		 */
 		mfs	r11, rpid
 		nop
-		bri	4
-		mfs	r3, rear		/* Get faulting address */
-		nop
 
 		/* If we are faulting a kernel address, we have to use the
 		 * kernel page tables. */
-		ori	r4, r0, CONFIG_KERNEL_START
-		cmpu	r4, r3, r4
+		ori	r6, r0, CONFIG_KERNEL_START
+		cmpu	r4, r3, r6
 		bgti	r4, ex5
 		ori	r4, r0, swapper_pg_dir
 		mts	rpid, r0		/* TLB will have 0 TID */
@@ -731,9 +721,8 @@ ex_handler_done:
 		 * Many of these bits are software only. Bits we don't set
 		 * here we (properly should) assume have the appropriate value.
 		 */
+		brid	finish_tlb_load
 		andni	r4, r4, 0x0ce2		/* Make sure 20, 21 are zero */
-
-		bri	finish_tlb_load
 	ex7:
 		/* The bailout. Restore registers to pre-exception conditions
 		 * and call the heavyweights to help us out.
@@ -754,9 +743,6 @@ ex_handler_done:
 		 */
 		mfs	r11, rpid
 		nop
-		bri	4
-		mfs	r3, rear		/* Get faulting address */
-		nop
 
 		/* If we are faulting a kernel address, we have to use the
 		 * kernel page tables.
@@ -792,7 +778,7 @@ ex_handler_done:
 		lwi	r4, r5, 0		/* Get Linux PTE */
 
 		andi	r6, r4, _PAGE_PRESENT
-		beqi	r6, ex7
+		beqi	r6, ex10
 
 		ori	r4, r4, _PAGE_ACCESSED
 		swi	r4, r5, 0
@@ -805,9 +791,8 @@ ex_handler_done:
 		 * Many of these bits are software only. Bits we don't set
 		 * here we (properly should) assume have the appropriate value.
 		 */
+		brid	finish_tlb_load
 		andni	r4, r4, 0x0ce2		/* Make sure 20, 21 are zero */
-
-		bri	finish_tlb_load
 	ex10:
 		/* The bailout. Restore registers to pre-exception conditions
 		 * and call the heavyweights to help us out.
@@ -837,9 +822,9 @@ ex_handler_done:
 		andi	r5, r5, (MICROBLAZE_TLB_SIZE-1)
 		ori	r6, r0, 1
 		cmp	r31, r5, r6
-		blti	r31, sem
+		blti	r31, ex12
 		addik	r5, r6, 1
-	sem:
+	ex12:
 		/* MS: save back current TLB index */
 		swi	r5, r0, TOPHYS(tlb_index)
 
@@ -859,7 +844,6 @@ ex_handler_done:
 		nop
 
 		/* Done...restore registers and get out of here. */
-	ex12:
 		mts	rpid, r11
 		nop
 		bri 4

arch/microblaze/kernel/misc.S

@@ -26,9 +26,10 @@
  * We avoid flushing the pinned 0, 1 and possibly 2 entries.
  */
 .globl _tlbia;
+.type  _tlbia, @function
 .align 4;
 _tlbia:
-	addik	r12, r0, 63 /* flush all entries (63 - 3) */
+	addik	r12, r0, MICROBLAZE_TLB_SIZE - 1 /* flush all entries (63 - 3) */
 	/* isync */
 _tlbia_1:
 	mts	rtlbx, r12
@@ -41,11 +42,13 @@ _tlbia_1:
 	/* sync */
 	rtsd	r15, 8
 	nop
+	.size  _tlbia, . - _tlbia
 
 /*
  * Flush MMU TLB for a particular address (in r5)
  */
 .globl _tlbie;
+.type  _tlbie, @function
 .align 4;
 _tlbie:
 	mts	rtlbsx, r5 /* look up the address in TLB */
@@ -59,17 +62,20 @@ _tlbie_1:
 	rtsd	r15, 8
 	nop
 
+	.size  _tlbie, . - _tlbie
+
 /*
  * Allocate TLB entry for early console
  */
 .globl early_console_reg_tlb_alloc;
+.type  early_console_reg_tlb_alloc, @function
 .align 4;
 early_console_reg_tlb_alloc:
 	/*
 	 * Load a TLB entry for the UART, so that microblaze_progress() can use
 	 * the UARTs nice and early.  We use a 4k real==virtual mapping.
 	 */
-	ori	r4, r0, 63
+	ori	r4, r0, MICROBLAZE_TLB_SIZE - 1
 	mts	rtlbx, r4 /* TLB slot 2 */
 
 	or	r4,r5,r0
@@ -86,6 +92,8 @@ early_console_reg_tlb_alloc:
 	rtsd	r15, 8
 	nop
 
+	.size  early_console_reg_tlb_alloc, . - early_console_reg_tlb_alloc
+
 /*
  * Copy a whole page (4096 bytes).
  */
@@ -104,6 +112,7 @@ early_console_reg_tlb_alloc:
 #define DCACHE_LINE_BYTES (4 * 4)
 
 .globl copy_page;
+.type  copy_page, @function
 .align 4;
 copy_page:
 	ori	r11, r0, (PAGE_SIZE/DCACHE_LINE_BYTES) - 1
@@ -118,3 +127,5 @@ _copy_page_loop:
 	addik	r11, r11, -1
 	rtsd	r15, 8
 	nop
+
+	.size  copy_page, . - copy_page

arch/microblaze/kernel/process.c

@@ -15,6 +15,7 @@
 #include <linux/bitops.h>
 #include <asm/system.h>
 #include <asm/pgalloc.h>
+#include <asm/uaccess.h> /* for USER_DS macros */
 #include <asm/cacheflush.h>
 
 void show_regs(struct pt_regs *regs)
@@ -74,7 +75,10 @@ __setup("hlt", hlt_setup);
 
 void default_idle(void)
 {
-	if (!hlt_counter) {
+	if (likely(hlt_counter)) {
+		while (!need_resched())
+			cpu_relax();
+	} else {
 		clear_thread_flag(TIF_POLLING_NRFLAG);
 		smp_mb__after_clear_bit();
 		local_irq_disable();
@@ -82,9 +86,7 @@ void default_idle(void)
 			cpu_sleep();
 		local_irq_enable();
 		set_thread_flag(TIF_POLLING_NRFLAG);
-	} else
-		while (!need_resched())
-			cpu_relax();
+	}
 }
 
 void cpu_idle(void)

arch/microblaze/kernel/setup.c

@@ -92,6 +92,12 @@ inline unsigned get_romfs_len(unsigned *addr)
 }
 #endif	/* CONFIG_MTD_UCLINUX_EBSS */
 
+#if defined(CONFIG_EARLY_PRINTK) && defined(CONFIG_SERIAL_UARTLITE_CONSOLE)
+#define eprintk early_printk
+#else
+#define eprintk printk
+#endif
+
 void __init machine_early_init(const char *cmdline, unsigned int ram,
 		unsigned int fdt, unsigned int msr)
 {
@@ -139,32 +145,32 @@ void __init machine_early_init(const char *cmdline, unsigned int ram,
 	setup_early_printk(NULL);
 #endif
 
-	early_printk("Ramdisk addr 0x%08x, ", ram);
+	eprintk("Ramdisk addr 0x%08x, ", ram);
 	if (fdt)
-		early_printk("FDT at 0x%08x\n", fdt);
+		eprintk("FDT at 0x%08x\n", fdt);
 	else
-		early_printk("Compiled-in FDT at 0x%08x\n",
+		eprintk("Compiled-in FDT at 0x%08x\n",
 					(unsigned int)_fdt_start);
 
 #ifdef CONFIG_MTD_UCLINUX
-	early_printk("Found romfs @ 0x%08x (0x%08x)\n",
+	eprintk("Found romfs @ 0x%08x (0x%08x)\n",
 			romfs_base, romfs_size);
-	early_printk("#### klimit %p ####\n", old_klimit);
+	eprintk("#### klimit %p ####\n", old_klimit);
 	BUG_ON(romfs_size < 0); /* What else can we do? */
 
-	early_printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
+	eprintk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
 			romfs_size, romfs_base, (unsigned)&_ebss);
 
-	early_printk("New klimit: 0x%08x\n", (unsigned)klimit);
+	eprintk("New klimit: 0x%08x\n", (unsigned)klimit);
 #endif
 
 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
 	if (msr)
-		early_printk("!!!Your kernel has setup MSR instruction but "
+		eprintk("!!!Your kernel has setup MSR instruction but "
 				"CPU don't have it %d\n", msr);
 #else
 	if (!msr)
-		early_printk("!!!Your kernel not setup MSR instruction but "
+		eprintk("!!!Your kernel not setup MSR instruction but "
 				"CPU have it %d\n", msr);
 #endif
 

arch/microblaze/kernel/traps.c

@@ -22,13 +22,11 @@ void trap_init(void)
 	__enable_hw_exceptions();
 }
 
-static int kstack_depth_to_print = 24;
+static unsigned long kstack_depth_to_print = 24;
 
 static int __init kstack_setup(char *s)
 {
-	kstack_depth_to_print = strict_strtoul(s, 0, NULL);
-
-	return 1;
+	return !strict_strtoul(s, 0, &kstack_depth_to_print);
 }
 __setup("kstack=", kstack_setup);
 

arch/microblaze/lib/Makefile

@@ -10,5 +10,4 @@ else
 lib-y += memcpy.o memmove.o
 endif
 
-lib-$(CONFIG_NO_MMU) += uaccess.o
-lib-$(CONFIG_MMU) += uaccess_old.o
+lib-y += uaccess_old.o

arch/microblaze/lib/fastcopy.S

@@ -30,8 +30,9 @@
  */
 
 #include <linux/linkage.h>
-
+	.text
 	.globl	memcpy
+	.type  memcpy, @function
 	.ent	memcpy
 
 memcpy:
@@ -345,9 +346,11 @@ a_done:
 	rtsd	r15, 8
 	nop
 
+.size  memcpy, . - memcpy
 .end memcpy
 /*----------------------------------------------------------------------------*/
 	.globl	memmove
+	.type  memmove, @function
 	.ent	memmove
 
 memmove:
@@ -659,4 +662,5 @@ d_done:
 	rtsd	r15, 8
 	nop
 
+.size  memmove, . - memmove
 .end memmove

arch/microblaze/lib/memcpy.c

@@ -53,7 +53,7 @@ void *memcpy(void *v_dst, const void *v_src, __kernel_size_t c)
 	const uint32_t *i_src;
 	uint32_t *i_dst;
 
-	if (c >= 4) {
+	if (likely(c >= 4)) {
 		unsigned  value, buf_hold;
 
 		/* Align the dstination to a word boundry. */

arch/microblaze/lib/memset.c

@@ -33,22 +33,23 @@
 #ifdef __HAVE_ARCH_MEMSET
 void *memset(void *v_src, int c, __kernel_size_t n)
 {
-
 	char *src = v_src;
 #ifdef CONFIG_OPT_LIB_FUNCTION
 	uint32_t *i_src;
-	uint32_t w32;
+	uint32_t w32 = 0;
 #endif
 	/* Truncate c to 8 bits */
 	c = (c & 0xFF);
 
 #ifdef CONFIG_OPT_LIB_FUNCTION
-	/* Make a repeating word out of it */
-	w32 = c;
-	w32 |= w32 << 8;
-	w32 |= w32 << 16;
+	if (unlikely(c)) {
+		/* Make a repeating word out of it */
+		w32 = c;
+		w32 |= w32 << 8;
+		w32 |= w32 << 16;
+	}
 
-	if (n >= 4) {
+	if (likely(n >= 4)) {
 		/* Align the destination to a word boundary */
 		/* This is done in an endian independant manner */
 		switch ((unsigned) src & 3) {

arch/microblaze/lib/uaccess.c

-/*
- * Copyright (C) 2006 Atmark Techno, Inc.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-
-#include <linux/string.h>
-#include <asm/uaccess.h>
-
-#include <asm/bug.h>
-
-long strnlen_user(const char __user *src, long count)
-{
-	return strlen(src) + 1;
-}
-
-#define __do_strncpy_from_user(dst, src, count, res)			\
-	do {								\
-		char *tmp;						\
-		strncpy(dst, src, count);				\
-		for (tmp = dst; *tmp && count > 0; tmp++, count--)	\
-			;						\
-		res = (tmp - dst);					\
-	} while (0)
-
-long __strncpy_from_user(char *dst, const char __user *src, long count)
-{
-	long res;
-	__do_strncpy_from_user(dst, src, count, res);
-	return res;
-}
-
-long strncpy_from_user(char *dst, const char __user *src, long count)
-{
-	long res = -EFAULT;
-	if (access_ok(VERIFY_READ, src, 1))
-		__do_strncpy_from_user(dst, src, count, res);
-	return res;
-}
-
-unsigned long __copy_tofrom_user(void __user *to,
-		const void __user *from, unsigned long size)
-{
-	memcpy(to, from, size);
-	return 0;
-}

arch/microblaze/lib/uaccess_old.S

@@ -22,6 +22,7 @@
 
 	.text
 .globl __strncpy_user;
+.type  __strncpy_user, @function
 .align 4;
 __strncpy_user:
 
@@ -50,7 +51,7 @@ __strncpy_user:
 3:
 	rtsd	r15,8
 	nop
-
+	.size   __strncpy_user, . - __strncpy_user
 
 	.section	.fixup, "ax"
 	.align	2
@@ -72,6 +73,7 @@ __strncpy_user:
 
 	.text
 .globl __strnlen_user;
+.type  __strnlen_user, @function
 .align 4;
 __strnlen_user:
 	addik	r3,r6,0
@@ -90,7 +92,7 @@ __strnlen_user:
 3:
 	rtsd	r15,8
 	nop
-
+	.size   __strnlen_user, . - __strnlen_user
 
 	.section	.fixup,"ax"
 4:
@@ -108,6 +110,7 @@ __strnlen_user:
  */
 	.text
 .globl __copy_tofrom_user;
+.type  __copy_tofrom_user, @function
 .align 4;
 __copy_tofrom_user:
 	/*
@@ -116,20 +119,34 @@ __copy_tofrom_user:
 	 * r7, r3 - count
 	 * r4 - tempval
 	 */
-	addik	r3,r7,0
-	beqi	r3,3f
-1:
-	lbu	r4,r6,r0
-	addik	r6,r6,1
-2:
-	sb	r4,r5,r0
-	addik	r3,r3,-1
-	bneid	r3,1b
-	addik	r5,r5,1		/* delay slot */
+	beqid	r7, 3f /* zero size is not likely */
+	andi	r3, r7, 0x3 /* filter add count */
+	bneid	r3, 4f /* if is odd value then byte copying */
+	or	r3, r5, r6 /* find if is any to/from unaligned */
+	andi	r3, r3, 0x3 /* mask unaligned */
+	bneid	r3, 1f /* it is unaligned -> then jump */
+	or	r3, r0, r0
+
+/* at least one 4 byte copy */
+5:	lw	r4, r6, r3
+6:	sw	r4, r5, r3
+	addik	r7, r7, -4
+	bneid	r7, 5b
+	addik	r3, r3, 4
+	addik	r3, r7, 0
+	rtsd	r15, 8
+	nop
+4:	or	r3, r0, r0
+1:	lbu	r4,r6,r3
+2:	sb	r4,r5,r3
+	addik	r7,r7,-1
+	bneid	r7,1b
+	addik	r3,r3,1		/* delay slot */
 3:
+	addik	r3,r7,0
 	rtsd	r15,8
 	nop
-
+	.size   __copy_tofrom_user, . - __copy_tofrom_user
 
 	.section	__ex_table,"a"
-	.word	1b,3b,2b,3b
+	.word	1b,3b,2b,3b,5b,3b,6b,3b

arch/microblaze/mm/fault.c

@@ -106,7 +106,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	regs->esr = error_code;
 
 	/* On a kernel SLB miss we can only check for a valid exception entry */
-	if (kernel_mode(regs) && (address >= TASK_SIZE)) {
+	if (unlikely(kernel_mode(regs) && (address >= TASK_SIZE))) {
 		printk(KERN_WARNING "kernel task_size exceed");
 		_exception(SIGSEGV, regs, code, address);
 	}
@@ -122,7 +122,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	}
 #endif /* CONFIG_KGDB */
 
-	if (in_atomic() || !mm) {
+	if (unlikely(in_atomic() || !mm)) {
 		if (kernel_mode(regs))
 			goto bad_area_nosemaphore;
 
@@ -150,7 +150,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	 * source.  If this is invalid we can skip the address space check,
 	 * thus avoiding the deadlock.
 	 */
-	if (!down_read_trylock(&mm->mmap_sem)) {
+	if (unlikely(!down_read_trylock(&mm->mmap_sem))) {
 		if (kernel_mode(regs) && !search_exception_tables(regs->pc))
 			goto bad_area_nosemaphore;
 
@@ -158,16 +158,16 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	}
 
 	vma = find_vma(mm, address);
-	if (!vma)
+	if (unlikely(!vma))
 		goto bad_area;
 
 	if (vma->vm_start <= address)
 		goto good_area;
 
-	if (!(vma->vm_flags & VM_GROWSDOWN))
+	if (unlikely(!(vma->vm_flags & VM_GROWSDOWN)))
 		goto bad_area;
 
-	if (!is_write)
+	if (unlikely(!is_write))
 		goto bad_area;
 
 	/*
@@ -179,7 +179,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	 * before setting the user r1.  Thus we allow the stack to
 	 * expand to 1MB without further checks.
 	 */
-	if (address + 0x100000 < vma->vm_end) {
+	if (unlikely(address + 0x100000 < vma->vm_end)) {
 
 		/* get user regs even if this fault is in kernel mode */
 		struct pt_regs *uregs = current->thread.regs;
@@ -209,15 +209,15 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	code = SEGV_ACCERR;
 
 	/* a write */
-	if (is_write) {
-		if (!(vma->vm_flags & VM_WRITE))
+	if (unlikely(is_write)) {
+		if (unlikely(!(vma->vm_flags & VM_WRITE)))
 			goto bad_area;
 	/* a read */
 	} else {
 		/* protection fault */
-		if (error_code & 0x08000000)
+		if (unlikely(error_code & 0x08000000))
 			goto bad_area;
-		if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
+		if (unlikely(!(vma->vm_flags & (VM_READ | VM_EXEC))))
 			goto bad_area;
 	}
 
@@ -235,7 +235,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 			goto do_sigbus;
 		BUG();
 	}
-	if (fault & VM_FAULT_MAJOR)
+	if (unlikely(fault & VM_FAULT_MAJOR))
 		current->maj_flt++;
 	else
 		current->min_flt++;

arch/microblaze/mm/init.c

@@ -165,7 +165,6 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
 	for (addr = begin; addr < end; addr += PAGE_SIZE) {
 		ClearPageReserved(virt_to_page(addr));
 		init_page_count(virt_to_page(addr));
-		memset((void *)addr, 0xcc, PAGE_SIZE);
 		free_page(addr);
 		totalram_pages++;
 	}
@@ -208,14 +207,6 @@ void __init mem_init(void)
 }
 
 #ifndef CONFIG_MMU
-/* Check against bounds of physical memory */
-int ___range_ok(unsigned long addr, unsigned long size)
-{
-	return ((addr < memory_start) ||
-		((addr + size) > memory_end));
-}
-EXPORT_SYMBOL(___range_ok);
-
 int page_is_ram(unsigned long pfn)
 {
 	return __range_ok(pfn, 0);

arch/microblaze/mm/pgtable.c

@@ -154,7 +154,7 @@ int map_page(unsigned long va, phys_addr_t pa, int flags)
 		err = 0;
 		set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
 				__pgprot(flags)));
-		if (mem_init_done)
+		if (unlikely(mem_init_done))
 			flush_HPTE(0, va, pmd_val(*pd));
 			/* flush_HPTE(0, va, pg); */
 	}