Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6

arch/sparc64/kernel/dtlb_base.S

@@ -53,19 +53,18 @@
  * be guaranteed to be 0 ... mmu_context.h does guarantee this
  * by only using 10 bits in the hwcontext value.
  */
-#define CREATE_VPTE_OFFSET1(r1, r2)
+#define CREATE_VPTE_OFFSET1(r1, r2) nop
 #define CREATE_VPTE_OFFSET2(r1, r2) \
 				srax	r1, 10, r2
-#define CREATE_VPTE_NOP		nop
 #else
 #define CREATE_VPTE_OFFSET1(r1, r2) \
 				srax	r1, PAGE_SHIFT, r2
 #define CREATE_VPTE_OFFSET2(r1, r2) \
 				sllx	r2, 3, r2
-#define CREATE_VPTE_NOP
 #endif
 
 /* DTLB ** ICACHE line 1: Quick user TLB misses		*/
+	mov		TLB_SFSR, %g1
 	ldxa		[%g1 + %g1] ASI_DMMU, %g4	! Get TAG_ACCESS
 	andcc		%g4, TAG_CONTEXT_BITS, %g0	! From Nucleus?
 from_tl1_trap:
@@ -74,18 +73,16 @@ from_tl1_trap:
 	be,pn		%xcc, kvmap			! Yep, special processing
 	 CREATE_VPTE_OFFSET2(%g4, %g6)			! Create VPTE offset
 	cmp		%g5, 4				! Last trap level?
-	be,pn		%xcc, longpath			! Yep, cannot risk VPTE miss
-	 nop						! delay slot
 
 /* DTLB ** ICACHE line 2: User finish + quick kernel TLB misses	*/
+	be,pn		%xcc, longpath			! Yep, cannot risk VPTE miss
+	 nop						! delay slot
 	ldxa		[%g3 + %g6] ASI_S, %g5		! Load VPTE
 1:	brgez,pn	%g5, longpath			! Invalid, branch out
 	 nop						! Delay-slot
 9:	stxa		%g5, [%g0] ASI_DTLB_DATA_IN	! Reload TLB
 	retry						! Trap return
 	nop
-	nop
-	nop
 
 /* DTLB ** ICACHE line 3: winfixups+real_faults		*/
 longpath:
@@ -106,8 +103,7 @@ longpath:
 	nop
 	nop
 	nop
-	CREATE_VPTE_NOP
+	nop
 
 #undef CREATE_VPTE_OFFSET1
 #undef CREATE_VPTE_OFFSET2
-#undef CREATE_VPTE_NOP

arch/sparc64/kernel/dtlb_prot.S

@@ -14,14 +14,14 @@
  */
 
 /* PROT ** ICACHE line 1: User DTLB protection trap	*/
-	stxa		%g0, [%g1] ASI_DMMU		! Clear SFSR FaultValid bit
-	membar		#Sync				! Synchronize ASI stores
-	rdpr		%pstate, %g5			! Move into alternate globals
+	mov		TLB_SFSR, %g1
+	stxa		%g0, [%g1] ASI_DMMU		! Clear FaultValid bit
+	membar		#Sync				! Synchronize stores
+	rdpr		%pstate, %g5			! Move into alt-globals
 	wrpr		%g5, PSTATE_AG|PSTATE_MG, %pstate
-	rdpr		%tl, %g1			! Need to do a winfixup?
+	rdpr		%tl, %g1			! Need a winfixup?
 	cmp		%g1, 1				! Trap level >1?
-	mov		TLB_TAG_ACCESS, %g4		! Prepare reload of vaddr
-	nop
+	mov		TLB_TAG_ACCESS, %g4		! For reload of vaddr
 
 /* PROT ** ICACHE line 2: More real fault processing */
 	bgu,pn		%xcc, winfix_trampoline		! Yes, perform winfixup

arch/sparc64/kernel/head.S

@@ -28,19 +28,14 @@
 #include <asm/mmu.h>
 	
 /* This section from from _start to sparc64_boot_end should fit into
- * 0x0000.0000.0040.4000 to 0x0000.0000.0040.8000 and will be sharing space
- * with bootup_user_stack, which is from 0x0000.0000.0040.4000 to
- * 0x0000.0000.0040.6000 and empty_bad_page, which is from
- * 0x0000.0000.0040.6000 to 0x0000.0000.0040.8000. 
+ * 0x0000000000404000 to 0x0000000000408000.
  */
-
 	.text
 	.globl	start, _start, stext, _stext
 _start:
 start:
 _stext:
 stext:
-bootup_user_stack:
 ! 0x0000000000404000
 	b	sparc64_boot
 	 flushw					/* Flush register file.      */
@@ -392,31 +387,30 @@ tlb_fixup_done:
 	 * former does use this code, the latter does not yet due
 	 * to some complexities.  That should be fixed up at some
 	 * point.
+	 *
+	 * There used to be enormous complexity wrt. transferring
+	 * over from the firwmare's trap table to the Linux kernel's.
+	 * For example, there was a chicken & egg problem wrt. building
+	 * the OBP page tables, yet needing to be on the Linux kernel
+	 * trap table (to translate PAGE_OFFSET addresses) in order to
+	 * do that.
+	 *
+	 * We now handle OBP tlb misses differently, via linear lookups
+	 * into the prom_trans[] array.  So that specific problem no
+	 * longer exists.  Yet, unfortunately there are still some issues
+	 * preventing trampoline.S from using this code... ho hum.
 	 */
 	.globl	setup_trap_table
 setup_trap_table:
 	save	%sp, -192, %sp
 
-	/* Force interrupts to be disabled.  Transferring over to
-	 * the Linux trap table is a very delicate operation.
-	 * Until we are actually on the Linux trap table, we cannot
-	 * get the PAGE_OFFSET linear mappings translated.  We need
-	 * that mapping to be setup in order to initialize the firmware
-	 * page tables.
-	 *
-	 * So there is this window of time, from the return from
-	 * prom_set_trap_table() until inherit_prom_mappings_post()
-	 * (in arch/sparc64/mm/init.c) completes, during which no
-	 * firmware address space accesses can be made.
-	 */
+	/* Force interrupts to be disabled. */
 	rdpr	%pstate, %o1
 	andn	%o1, PSTATE_IE, %o1
 	wrpr	%o1, 0x0, %pstate
 	wrpr	%g0, 15, %pil
 
-	/* Ok, now make the final valid firmware call to jump over
-	 * to the Linux trap table.
-	 */
+	/* Make the firmware call to jump over to the Linux trap table.  */
 	call	prom_set_trap_table
 	 sethi	%hi(sparc64_ttable_tl0), %o0
 
@@ -540,15 +534,21 @@ setup_tba:	/* i0 = is_starfire */
 
 	ret
 	 restore
+sparc64_boot_end:
+
+#include "systbls.S"
+#include "ktlb.S"
+#include "etrap.S"
+#include "rtrap.S"
+#include "winfixup.S"
+#include "entry.S"
 
 /*
- * The following skips make sure the trap table in ttable.S is aligned
+ * The following skip makes sure the trap table in ttable.S is aligned
  * on a 32K boundary as required by the v9 specs for TBA register.
  */
-sparc64_boot_end:
-	.skip	0x2000 + _start - sparc64_boot_end
-bootup_user_stack_end:
-	.skip	0x2000
+1:
+	.skip	0x4000 + _start - 1b
 
 #ifdef CONFIG_SBUS
 /* This is just a hack to fool make depend config.h discovering
@@ -560,15 +560,6 @@ bootup_user_stack_end:
 ! 0x0000000000408000
 
 #include "ttable.S"
-#include "systbls.S"
-#include "ktlb.S"
-#include "etrap.S"
-#include "rtrap.S"
-#include "winfixup.S"
-#include "entry.S"
-
-	/* This is just anal retentiveness on my part... */
-	.align	16384
 
 	.data
 	.align	8

arch/sparc64/kernel/itlb_base.S

@@ -15,14 +15,12 @@
  */
 #define CREATE_VPTE_OFFSET1(r1, r2) \
 				srax	r1, 10, r2
-#define CREATE_VPTE_OFFSET2(r1, r2)
-#define CREATE_VPTE_NOP		nop
+#define CREATE_VPTE_OFFSET2(r1, r2) nop
 #else /* PAGE_SHIFT */
 #define CREATE_VPTE_OFFSET1(r1, r2) \
 				srax	r1, PAGE_SHIFT, r2
 #define CREATE_VPTE_OFFSET2(r1, r2) \
 				sllx	r2, 3, r2
-#define CREATE_VPTE_NOP
 #endif /* PAGE_SHIFT */
 
 
@@ -36,6 +34,7 @@
  */
 
 /* ITLB ** ICACHE line 1: Quick user TLB misses		*/
+	mov		TLB_SFSR, %g1
 	ldxa		[%g1 + %g1] ASI_IMMU, %g4	! Get TAG_ACCESS
 	CREATE_VPTE_OFFSET1(%g4, %g6)			! Create VPTE offset
 	CREATE_VPTE_OFFSET2(%g4, %g6)			! Create VPTE offset
@@ -43,41 +42,38 @@
 1:	brgez,pn	%g5, 3f				! Not valid, branch out
 	 sethi		%hi(_PAGE_EXEC), %g4		! Delay-slot
 	andcc		%g5, %g4, %g0			! Executable?
+
+/* ITLB ** ICACHE line 2: Real faults			*/
 	be,pn		%xcc, 3f			! Nope, branch.
 	 nop						! Delay-slot
 2:	stxa		%g5, [%g0] ASI_ITLB_DATA_IN	! Load PTE into TLB
 	retry						! Trap return
-3:	rdpr		%pstate, %g4			! Move into alternate globals
-
-/* ITLB ** ICACHE line 2: Real faults			*/
+3:	rdpr		%pstate, %g4			! Move into alt-globals
 	wrpr		%g4, PSTATE_AG|PSTATE_MG, %pstate
 	rdpr		%tpc, %g5			! And load faulting VA
 	mov		FAULT_CODE_ITLB, %g4		! It was read from ITLB
-sparc64_realfault_common:				! Called by TL0 dtlb_miss too
+
+/* ITLB ** ICACHE line 3: Finish faults	*/
+sparc64_realfault_common:				! Called by dtlb_miss
 	stb		%g4, [%g6 + TI_FAULT_CODE]
 	stx		%g5, [%g6 + TI_FAULT_ADDR]
 	ba,pt		%xcc, etrap			! Save state
 1:	 rd		%pc, %g7			! ...
-	nop
-
-/* ITLB ** ICACHE line 3: Finish faults + window fixups	*/
 	call		do_sparc64_fault		! Call fault handler
 	 add		%sp, PTREGS_OFF, %o0! Compute pt_regs arg
 	ba,pt		%xcc, rtrap_clr_l6		! Restore cpu state
 	 nop
+
+/* ITLB ** ICACHE line 4: Window fixups */
 winfix_trampoline:
 	rdpr		%tpc, %g3			! Prepare winfixup TNPC
-	or		%g3, 0x7c, %g3			! Compute offset to branch
+	or		%g3, 0x7c, %g3			! Compute branch offset
 	wrpr		%g3, %tnpc			! Write it into TNPC
 	done						! Do it to it
-
-/* ITLB ** ICACHE line 4: Unused...	*/
 	nop
 	nop
 	nop
 	nop
-	CREATE_VPTE_NOP
 
 #undef CREATE_VPTE_OFFSET1
 #undef CREATE_VPTE_OFFSET2
-#undef CREATE_VPTE_NOP

arch/sparc64/kernel/ktlb.S

@@ -58,9 +58,6 @@ vpte_noent:
 	done
 
 vpte_insn_obp:
-	sethi		%hi(prom_pmd_phys), %g5
-	ldx		[%g5 + %lo(prom_pmd_phys)], %g5
-
 	/* Behave as if we are at TL0.  */
 	wrpr		%g0, 1, %tl
 	rdpr		%tpc, %g4	/* Find original faulting iaddr */
@@ -71,58 +68,57 @@ vpte_insn_obp:
 	mov		TLB_SFSR, %g1
 	stxa		%g4, [%g1 + %g1] ASI_IMMU
 
-	/* Get PMD offset.  */
-	srlx		%g4, 23, %g6
-	and		%g6, 0x7ff, %g6
-	sllx		%g6, 2, %g6
-
-	/* Load PMD, is it valid?  */
-	lduwa		[%g5 + %g6] ASI_PHYS_USE_EC, %g5
-	brz,pn		%g5, longpath
-	 sllx		%g5, 11, %g5
-
-	/* Get PTE offset.  */
-	srlx		%g4, 13, %g6
-	and		%g6, 0x3ff, %g6
-	sllx		%g6, 3, %g6
-
-	/* Load PTE.  */
-	ldxa		[%g5 + %g6] ASI_PHYS_USE_EC, %g5
-	brgez,pn	%g5, longpath
-	 nop
-
-	/* TLB load and return from trap.  */
+	sethi		%hi(prom_trans), %g5
+	or		%g5, %lo(prom_trans), %g5
+
+1:	ldx		[%g5 + 0x00], %g6	! base
+	brz,a,pn	%g6, longpath		! no more entries, fail
+	 mov		TLB_SFSR, %g1		! and restore %g1
+	ldx		[%g5 + 0x08], %g1	! len
+	add		%g6, %g1, %g1		! end
+	cmp		%g6, %g4
+	bgu,pt		%xcc, 2f
+	 cmp		%g4, %g1
+	bgeu,pt		%xcc, 2f
+	 ldx		[%g5 + 0x10], %g1	! PTE
+
+	/* TLB load, restore %g1, and return from trap.  */
+	sub		%g4, %g6, %g6
+	add		%g1, %g6, %g5
+	mov		TLB_SFSR, %g1
 	stxa		%g5, [%g0] ASI_ITLB_DATA_IN
 	retry
 
-kvmap_do_obp:
-	sethi		%hi(prom_pmd_phys), %g5
-	ldx		[%g5 + %lo(prom_pmd_phys)], %g5
-
-	/* Get PMD offset.  */
-	srlx		%g4, 23, %g6
-	and		%g6, 0x7ff, %g6
-	sllx		%g6, 2, %g6
-
-	/* Load PMD, is it valid?  */
-	lduwa		[%g5 + %g6] ASI_PHYS_USE_EC, %g5
-	brz,pn		%g5, longpath
-	 sllx		%g5, 11, %g5
-
-	/* Get PTE offset.  */
-	srlx		%g4, 13, %g6
-	and		%g6, 0x3ff, %g6
-	sllx		%g6, 3, %g6
-
-	/* Load PTE.  */
-	ldxa		[%g5 + %g6] ASI_PHYS_USE_EC, %g5
-	brgez,pn	%g5, longpath
-	 nop
+2:	ba,pt		%xcc, 1b
+	 add		%g5, (3 * 8), %g5	! next entry
 
-	/* TLB load and return from trap.  */
+kvmap_do_obp:
+	sethi		%hi(prom_trans), %g5
+	or		%g5, %lo(prom_trans), %g5
+	srlx		%g4, 13, %g4
+	sllx		%g4, 13, %g4
+
+1:	ldx		[%g5 + 0x00], %g6	! base
+	brz,a,pn	%g6, longpath		! no more entries, fail
+	 mov		TLB_SFSR, %g1		! and restore %g1
+	ldx		[%g5 + 0x08], %g1	! len
+	add		%g6, %g1, %g1		! end
+	cmp		%g6, %g4
+	bgu,pt		%xcc, 2f
+	 cmp		%g4, %g1
+	bgeu,pt		%xcc, 2f
+	 ldx		[%g5 + 0x10], %g1	! PTE
+
+	/* TLB load, restore %g1, and return from trap.  */
+	sub		%g4, %g6, %g6
+	add		%g1, %g6, %g5
+	mov		TLB_SFSR, %g1
 	stxa		%g5, [%g0] ASI_DTLB_DATA_IN
 	retry
 
+2:	ba,pt		%xcc, 1b
+	 add		%g5, (3 * 8), %g5	! next entry
+
 /*
  * On a first level data miss, check whether this is to the OBP range (note
  * that such accesses can be made by prom, as well as by kernel using

arch/sparc64/mm/init.c

@@ -105,7 +105,7 @@ static void __init read_obp_memory(const char *property,
 		regs[i].phys_addr = base;
 		regs[i].reg_size = size;
 	}
-	sort(regs, ents, sizeof(struct  linux_prom64_registers),
+	sort(regs, ents, sizeof(struct linux_prom64_registers),
 	     cmp_p64, NULL);
 }
 
@@ -367,8 +367,11 @@ struct linux_prom_translation {
 	unsigned long size;
 	unsigned long data;
 };
-static struct linux_prom_translation prom_trans[512] __initdata;
-static unsigned int prom_trans_ents __initdata;
+
+/* Exported for kernel TLB miss handling in ktlb.S */
+struct linux_prom_translation prom_trans[512] __read_mostly;
+unsigned int prom_trans_ents __read_mostly;
+unsigned int swapper_pgd_zero __read_mostly;
 
 extern unsigned long prom_boot_page;
 extern void prom_remap(unsigned long physpage, unsigned long virtpage, int mmu_ihandle);
@@ -378,122 +381,57 @@ extern void register_prom_callbacks(void);
 /* Exported for SMP bootup purposes. */
 unsigned long kern_locked_tte_data;
 
-/* Exported for kernel TLB miss handling in ktlb.S */
-unsigned long prom_pmd_phys __read_mostly;
-unsigned int swapper_pgd_zero __read_mostly;
-
-static pmd_t *prompmd __read_mostly;
-
-#define BASE_PAGE_SIZE 8192
-
 /*
  * Translate PROM's mapping we capture at boot time into physical address.
  * The second parameter is only set from prom_callback() invocations.
  */
 unsigned long prom_virt_to_phys(unsigned long promva, int *error)
 {
-	pmd_t *pmdp = prompmd + ((promva >> 23) & 0x7ff);
-	pte_t *ptep;
-	unsigned long base;
-
-	if (pmd_none(*pmdp)) {
-		if (error)
-			*error = 1;
-		return 0;
-	}
-	ptep = (pte_t *)__pmd_page(*pmdp) + ((promva >> 13) & 0x3ff);
-	if (!pte_present(*ptep)) {
-		if (error)
-			*error = 1;
-		return 0;
-	}
-	if (error) {
-		*error = 0;
-		return pte_val(*ptep);
-	}
-	base = pte_val(*ptep) & _PAGE_PADDR;
-
-	return base + (promva & (BASE_PAGE_SIZE - 1));
-}
+	int i;
 
-/* The obp translations are saved based on 8k pagesize, since obp can
- * use a mixture of pagesizes. Misses to the LOW_OBP_ADDRESS ->
- * HI_OBP_ADDRESS range are handled in entry.S and do not use the vpte
- * scheme (also, see rant in inherit_locked_prom_mappings()).
- */
-static void __init build_obp_range(unsigned long start, unsigned long end, unsigned long data)
-{
-	unsigned long vaddr;
+	for (i = 0; i < prom_trans_ents; i++) {
+		struct linux_prom_translation *p = &prom_trans[i];
 
-	for (vaddr = start; vaddr < end; vaddr += BASE_PAGE_SIZE) {
-		unsigned long val;
-		pmd_t *pmd;
-		pte_t *pte;
+		if (promva >= p->virt &&
+		    promva < (p->virt + p->size)) {
+			unsigned long base = p->data & _PAGE_PADDR;
 
-		pmd = prompmd + ((vaddr >> 23) & 0x7ff);
-		if (pmd_none(*pmd)) {
-			pte = __alloc_bootmem(BASE_PAGE_SIZE, BASE_PAGE_SIZE,
-					      PAGE_SIZE);
-			if (!pte)
-				prom_halt();
-			memset(pte, 0, BASE_PAGE_SIZE);
-			pmd_set(pmd, pte);
+			if (error)
+				*error = 0;
+			return base + (promva & (8192 - 1));
 		}
-		pte = (pte_t *) __pmd_page(*pmd) + ((vaddr >> 13) & 0x3ff);
-
-		val = data;
-
-		/* Clear diag TTE bits. */
-		if (tlb_type == spitfire)
-			val &= ~0x0003fe0000000000UL;
-
-		set_pte_at(&init_mm, vaddr, pte,
-			   __pte(val | _PAGE_MODIFIED));
-
-		data += BASE_PAGE_SIZE;
 	}
+	if (error)
+		*error = 1;
+	return 0UL;
 }
 
+/* The obp translations are saved based on 8k pagesize, since obp can
+ * use a mixture of pagesizes. Misses to the LOW_OBP_ADDRESS ->
+ * HI_OBP_ADDRESS range are handled in ktlb.S and do not use the vpte
+ * scheme (also, see rant in inherit_locked_prom_mappings()).
+ */
 static inline int in_obp_range(unsigned long vaddr)
 {
 	return (vaddr >= LOW_OBP_ADDRESS &&
 		vaddr < HI_OBP_ADDRESS);
 }
 
-#define OBP_PMD_SIZE 2048
-static void __init build_obp_pgtable(void)
+static int cmp_ptrans(const void *a, const void *b)
 {
-	unsigned long i;
-
-	prompmd = __alloc_bootmem(OBP_PMD_SIZE, OBP_PMD_SIZE, PAGE_SIZE);
-	if (!prompmd)
-		prom_halt();
-
-	memset(prompmd, 0, OBP_PMD_SIZE);
-
-	prom_pmd_phys = __pa(prompmd);
-
-	for (i = 0; i < prom_trans_ents; i++) {
-		unsigned long start, end;
-
-		if (!in_obp_range(prom_trans[i].virt))
-			continue;
+	const struct linux_prom_translation *x = a, *y = b;
 
-		start = prom_trans[i].virt;
-		end = start + prom_trans[i].size;
-		if (end > HI_OBP_ADDRESS)
-			end = HI_OBP_ADDRESS;
-
-		build_obp_range(start, end, prom_trans[i].data);
-	}
+	if (x->virt > y->virt)
+		return 1;
+	if (x->virt < y->virt)
+		return -1;
+	return 0;
 }
 
-/* Read OBP translations property into 'prom_trans[]'.
- * Return the number of entries.
- */
+/* Read OBP translations property into 'prom_trans[]'.  */
 static void __init read_obp_translations(void)
 {
-	int n, node;
+	int n, node, ents, first, last, i;
 
 	node = prom_finddevice("/virtual-memory");
 	n = prom_getproplen(node, "translations");
@@ -515,7 +453,41 @@ static void __init read_obp_translations(void)
 
 	n = n / sizeof(struct linux_prom_translation);
 
-	prom_trans_ents = n;
+	ents = n;
+
+	sort(prom_trans, ents, sizeof(struct linux_prom_translation),
+	     cmp_ptrans, NULL);
+
+	/* Now kick out all the non-OBP entries.  */
+	for (i = 0; i < ents; i++) {
+		if (in_obp_range(prom_trans[i].virt))
+			break;
+	}
+	first = i;
+	for (; i < ents; i++) {
+		if (!in_obp_range(prom_trans[i].virt))
+			break;
+	}
+	last = i;
+
+	for (i = 0; i < (last - first); i++) {
+		struct linux_prom_translation *src = &prom_trans[i + first];
+		struct linux_prom_translation *dest = &prom_trans[i];
+
+		*dest = *src;
+	}
+	for (; i < ents; i++) {
+		struct linux_prom_translation *dest = &prom_trans[i];
+		dest->virt = dest->size = dest->data = 0x0UL;
+	}
+
+	prom_trans_ents = last - first;
+
+	if (tlb_type == spitfire) {
+		/* Clear diag TTE bits. */
+		for (i = 0; i < prom_trans_ents; i++)
+			prom_trans[i].data &= ~0x0003fe0000000000UL;
+	}
 }
 
 static void __init remap_kernel(void)
@@ -553,21 +525,18 @@ static void __init remap_kernel(void)
 }
 
 
-static void __init inherit_prom_mappings_pre(void)
+static void __init inherit_prom_mappings(void)
 {
 	read_obp_translations();
 
 	/* Now fixup OBP's idea about where we really are mapped. */
 	prom_printf("Remapping the kernel... ");
 	remap_kernel();
-
 	prom_printf("done.\n");
-}
 
-static void __init inherit_prom_mappings_post(void)
-{
-	build_obp_pgtable();
+	prom_printf("Registering callbacks... ");
 	register_prom_callbacks();
+	prom_printf("done.\n");
 }
 
 /* The OBP specifications for sun4u mark 0xfffffffc00000000 and
@@ -1519,7 +1488,7 @@ void __init paging_init(void)
 	
 	swapper_pgd_zero = pgd_val(swapper_pg_dir[0]);
 	
-	inherit_prom_mappings_pre();
+	inherit_prom_mappings();
 	
 	/* Ok, we can use our TLB miss and window trap handlers safely.
 	 * We need to do a quick peek here to see if we are on StarFire
@@ -1530,23 +1499,15 @@ void __init paging_init(void)
 		extern void setup_tba(int);
 		setup_tba(this_is_starfire);
 	}
-	__flush_tlb_all();
 
-	/* Everything from this point forward, until we are done with
-	 * inherit_prom_mappings_post(), must complete successfully
-	 * without calling into the firmware.  The firwmare page tables
-	 * have not been built, but we are running on the Linux kernel's
-	 * trap table.
-	 */
+	inherit_locked_prom_mappings(1);
+
+	__flush_tlb_all();
 
 	/* Setup bootmem... */
 	pages_avail = 0;
 	last_valid_pfn = end_pfn = bootmem_init(&pages_avail);
 
-	inherit_prom_mappings_post();
-
-	inherit_locked_prom_mappings(1);
-
 #ifdef CONFIG_DEBUG_PAGEALLOC
 	kernel_physical_mapping_init();
 #endif