microblaze: Do not used hardcoded value in exception handler

Use predefined macros to support more page sizes.
Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/include/asm/page.h

@@ -37,6 +37,8 @@
 
 #define LOAD_OFFSET	ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
 
+#define PTE_SHIFT	(PAGE_SHIFT - 2)	/* 1024 ptes per page */
+
 #ifndef __ASSEMBLY__
 
 /* MS be sure that SLAB allocates aligned objects */
@@ -71,7 +73,6 @@ extern unsigned int __page_offset;
  * The basic type of a PTE - 32 bit physical addressing.
  */
 typedef unsigned long pte_basic_t;
-#define PTE_SHIFT	(PAGE_SHIFT - 2)	/* 1024 ptes per page */
 #define PTE_FMT		"%.8lx"
 
 #endif /* CONFIG_MMU */

arch/microblaze/kernel/hw_exception_handler.S

@@ -602,18 +602,19 @@ ex_handler_done:
 		lwi	r4, r4, TASK_THREAD+PGDIR
 	ex4:
 		tophys(r4,r4)
-		BSRLI(r5,r3,20)		/* Create L1 (pgdir/pmd) address */
-		andi	r5, r5, 0xffc
+		/* Create L1 (pgdir/pmd) address */
+		BSRLI(r5,r3, PGDIR_SHIFT - 2)
+		andi	r5, r5, PAGE_SIZE - 4
 /* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */
 		or	r4, r4, r5
 		lwi	r4, r4, 0		/* Get L1 entry */
-		andi	r5, r4, 0xfffff000 /* Extract L2 (pte) base address */
+		andi	r5, r4, PAGE_MASK /* Extract L2 (pte) base address */
 		beqi	r5, ex2			/* Bail if no table */
 
 		tophys(r5,r5)
-		BSRLI(r6,r3,10)			/* Compute PTE address */
-		andi	r6, r6, 0xffc
-		andi	r5, r5, 0xfffff003
+		BSRLI(r6,r3,PTE_SHIFT) /* Compute PTE address */
+		andi	r6, r6, PAGE_SIZE - 4
+		andi	r5, r5, PAGE_MASK + 0x3
 		or	r5, r5, r6
 		lwi	r4, r5, 0		/* Get Linux PTE */
 
@@ -632,7 +633,9 @@ ex_handler_done:
 		 * Many of these bits are software only. Bits we don't set
 		 * here we (properly should) assume have the appropriate value.
 		 */
-		andni	r4, r4, 0x0ce2		/* Make sure 20, 21 are zero */
+/* Ignore memory coherent, just LSB on ZSEL is used + EX/WR */
+		andi	r4, r4, PAGE_MASK | TLB_EX | TLB_WR | \
+						TLB_ZSEL(1) | TLB_ATTR_MASK
 		ori	r4, r4, _PAGE_HWEXEC	/* make it executable */
 
 		/* find the TLB index that caused the fault. It has to be here*/
@@ -701,18 +704,19 @@ ex_handler_done:
 		lwi	r4, r4, TASK_THREAD+PGDIR
 	ex6:
 		tophys(r4,r4)
-		BSRLI(r5,r3,20)		/* Create L1 (pgdir/pmd) address */
-		andi	r5, r5, 0xffc
+		/* Create L1 (pgdir/pmd) address */
+		BSRLI(r5,r3, PGDIR_SHIFT - 2)
+		andi	r5, r5, PAGE_SIZE - 4
 /* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */
 		or	r4, r4, r5
 		lwi	r4, r4, 0		/* Get L1 entry */
-		andi	r5, r4, 0xfffff000 /* Extract L2 (pte) base address */
+		andi	r5, r4, PAGE_MASK /* Extract L2 (pte) base address */
 		beqi	r5, ex7			/* Bail if no table */
 
 		tophys(r5,r5)
-		BSRLI(r6,r3,10)			/* Compute PTE address */
-		andi	r6, r6, 0xffc
-		andi	r5, r5, 0xfffff003
+		BSRLI(r6,r3,PTE_SHIFT) /* Compute PTE address */
+		andi	r6, r6, PAGE_SIZE - 4
+		andi	r5, r5, PAGE_MASK + 0x3
 		or	r5, r5, r6
 		lwi	r4, r5, 0		/* Get Linux PTE */
 
@@ -731,7 +735,8 @@ ex_handler_done:
 		 * here we (properly should) assume have the appropriate value.
 		 */
 		brid	finish_tlb_load
-		andni	r4, r4, 0x0ce2		/* Make sure 20, 21 are zero */
+		andi	r4, r4, PAGE_MASK | TLB_EX | TLB_WR | \
+						TLB_ZSEL(1) | TLB_ATTR_MASK
 	ex7:
 		/* The bailout. Restore registers to pre-exception conditions
 		 * and call the heavyweights to help us out.
@@ -771,18 +776,19 @@ ex_handler_done:
 		lwi	r4, r4, TASK_THREAD+PGDIR
 	ex9:
 		tophys(r4,r4)
-		BSRLI(r5,r3,20)		/* Create L1 (pgdir/pmd) address */
-		andi	r5, r5, 0xffc
+		/* Create L1 (pgdir/pmd) address */
+		BSRLI(r5,r3, PGDIR_SHIFT - 2)
+		andi	r5, r5, PAGE_SIZE - 4
 /* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */
 		or	r4, r4, r5
 		lwi	r4, r4, 0		/* Get L1 entry */
-		andi	r5, r4, 0xfffff000 /* Extract L2 (pte) base address */
+		andi	r5, r4, PAGE_MASK /* Extract L2 (pte) base address */
 		beqi	r5, ex10		/* Bail if no table */
 
 		tophys(r5,r5)
-		BSRLI(r6,r3,10)			/* Compute PTE address */
-		andi	r6, r6, 0xffc
-		andi	r5, r5, 0xfffff003
+		BSRLI(r6,r3,PTE_SHIFT) /* Compute PTE address */
+		andi	r6, r6, PAGE_SIZE - 4
+		andi	r5, r5, PAGE_MASK + 0x3
 		or	r5, r5, r6
 		lwi	r4, r5, 0		/* Get Linux PTE */
 
@@ -801,7 +807,8 @@ ex_handler_done:
 		 * here we (properly should) assume have the appropriate value.
 		 */
 		brid	finish_tlb_load
-		andni	r4, r4, 0x0ce2		/* Make sure 20, 21 are zero */
+		andi	r4, r4, PAGE_MASK | TLB_EX | TLB_WR | \
+						TLB_ZSEL(1) | TLB_ATTR_MASK
 	ex10:
 		/* The bailout. Restore registers to pre-exception conditions
 		 * and call the heavyweights to help us out.
@@ -854,8 +861,8 @@ ex_handler_done:
 		 * set of bits. These are size, valid, E, U0, and ensure
 		 * bits 20 and 21 are zero.
 		 */
-		andi	r3, r3, 0xfffff000
-		ori	r3, r3, 0x0c0
+		andi	r3, r3, PAGE_MASK
+		ori	r3, r3, TLB_VALID | TLB_PAGESZ(PAGESZ_4K)
 		mts	rtlbhi,	r3		/* Load TLB HI */
 		nop