[PATCH 14/20] powerpc/8xx: Use PAGE size related consts

[Christophe Leroy]

For PAGE size related operations, use PAGE size consts in order to be able to
use different page size in the futur.

Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>

---
 arch/powerpc/kernel/head_8xx.S |   29 ++++++++++++++++++-----------
 1 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 5671c76..43fdb5c 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -292,9 +292,9 @@ InstructionTLBMiss:
 	mtspr	SPRN_SPRG_SCRATCH2, r10
 	mfspr	r10, SPRN_SRR0	/* Get effective address of fault */
 #ifdef CONFIG_8xx_CPU15
-	addi	r11, r10, 0x1000
+	addi	r11, r10, PAGE_SIZE
 	tlbie	r11
-	addi	r11, r10, -0x1000
+	addi	r11, r10, -PAGE_SIZE
 	tlbie	r11
 #endif
 
@@ -312,7 +312,8 @@ InstructionTLBMiss:
 	lis	r11, (swapper_pg_dir-PAGE_OFFSET)@h
 3:
 #endif
-	rlwinm	r10, r10, 12, 20, 29	/* Extract level 1 index */
+	/* Extract level 1 index */
+	rlwinm	r10, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
 	lwzx	r11, r10, r11	/* Get the level 1 entry */
 	rlwinm.	r10, r11,0,0,19	/* Extract page descriptor page address */
 	beq	2f		/* If zero, don't try to find a pte */
@@ -324,7 +325,8 @@ InstructionTLBMiss:
 	DO_8xx_CPU6(0x2b80, r3)
 	mtspr	SPRN_MI_TWC, r11	/* Set segment attributes */
 	mfspr	r11, SPRN_SRR0	/* Get effective address of fault */
-	rlwinm	r11, r11, 22, 20, 29	/* Extract level 2 index */
+	/* Extract level 2 index */
+	rlwinm	r11, r11, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
 	lwzx	r10, r10, r11	/* Get the pte */
 
 #ifdef CONFIG_SWAP
@@ -383,7 +385,8 @@ DataStoreTLBMiss:
 	beq	3f
 	lis	r11, (swapper_pg_dir-PAGE_OFFSET)@h
 3:
-	rlwinm	r10, r10, 12, 20, 29	/* Extract level 1 index */
+	/* Extract level 1 index */
+	rlwinm	r10, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
 	lwzx	r11, r10, r11	/* Get the level 1 entry */
 	rlwinm.	r10, r11,0,0,19	/* Extract page descriptor page address */
 	beq	2f		/* If zero, don't try to find a pte */
@@ -392,7 +395,8 @@ DataStoreTLBMiss:
 	 */
 	mtcr	r11
 	mfspr	r11, SPRN_MD_EPN	/* Get address of fault */
-	rlwinm	r11, r11, 22, 20, 29	/* Extract level 2 index */
+	/* Extract level 2 index */
+	rlwinm	r11, r11, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
 	lwzx	r10, r10, r11	/* Get the pte */
 
 	mfcr	r11
@@ -523,18 +527,20 @@ FixupDAR:/* Entry point for dcbx workaround. */
 	mfspr	r11, SPRN_M_TW	/* Get level 1 table base address */
 	beq-	3f		/* Branch if user space */
 	lis	r11, (swapper_pg_dir-PAGE_OFFSET)@h
-3:	rlwinm	r10, r10, 12, 20, 29	/* Extract level 1 index */
+	/* Extract level 1 index */
+3:	rlwinm	r10, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
 	lwzx	r11, r10, r11	/* Get the level 1 entry */
 	rlwinm	r10, r11,0,0,19	/* Extract page descriptor page address */
 	mfspr	r11, SPRN_SRR0	/* Get effective address of fault */
-	rlwinm	r11, r11, 22, 20, 29	/* Extract level 2 index */
+	/* Extract level 2 index */
+	rlwinm	r11, r11, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
 	lwzx	r11, r10, r11	/* Get the pte */
 #ifdef CONFIG_8xx_CPU6
 	lwz	r3, 8(r0)	/* restore r3 from memory */
 #endif
 	/* concat physical page address(r11) and page offset(r10) */
 	mfspr	r10, SPRN_SRR0
-	rlwimi	r11, r10, 0, 20, 31
+	rlwimi	r11, r10, 0, 32 - PAGE_SHIFT, 31
 	lwz	r11,0(r11)
 /* Check if it really is a dcbx instruction. */
 /* dcbt and dcbtst does not generate DTLB Misses/Errors,
@@ -911,11 +917,12 @@ sdata:
 	.globl	swapper_pg_dir
 	.align	16
 swapper_pg_dir:
-	.space	4096
+	.space	PGD_TABLE_SIZE
 
 	.globl	empty_zero_page
+	.align	PAGE_SHIFT
 empty_zero_page:
-	.space	4096
+	.space	PAGE_SIZE
 
 /* Room for two PTE table poiners, usually the kernel and current user
  * pointer to their respective root page table (pgdir).
-- 
1.7.1