[RFC][PATCH 3/8] 4xx MMU

[Josh Boyer]

Add MMU definitions for 40x platforms.  Also fixes two warnings in 4xx_mmu.c.

Signed-off-by: Josh Boyer <jwboyer at linux.vnet.ibm.com>

---
 arch/powerpc/mm/4xx_mmu.c     |    4 +-
 include/asm-powerpc/mmu-4xx.h |   65 ++++++++++++++++++++++++++++++++++++++++++
 include/asm-powerpc/mmu.h     |    3 +
 3 files changed, 70 insertions(+), 2 deletions(-)

--- /dev/null
+++ linux-2.6/include/asm-powerpc/mmu-4xx.h
@@ -0,0 +1,65 @@
+#ifndef _ASM_POWERPC_MMU_4XX_H_
+#define _ASM_POWERPC_MMU_4XX_H_
+
+/*
+ * PPC40x support
+ */
+
+#define PPC4XX_TLB_SIZE 64
+
+/*
+ * TLB entries are defined by a "high" tag portion and a "low" data
+ * portion.  On all architectures, the data portion is 32-bits.
+ *
+ * TLB entries are managed entirely under software control by reading,
+ * writing, and searchoing using the 4xx-specific tlbre, tlbwr, and tlbsx
+ * instructions.
+ */
+
+#define	TLB_LO          1
+#define	TLB_HI          0
+
+#define	TLB_DATA        TLB_LO
+#define	TLB_TAG         TLB_HI
+
+/* Tag portion */
+
+#define TLB_EPN_MASK    0xFFFFFC00      /* Effective Page Number */
+#define TLB_PAGESZ_MASK 0x00000380
+#define TLB_PAGESZ(x)   (((x) & 0x7) << 7)
+#define   PAGESZ_1K		0
+#define   PAGESZ_4K             1
+#define   PAGESZ_16K            2
+#define   PAGESZ_64K            3
+#define   PAGESZ_256K           4
+#define   PAGESZ_1M             5
+#define   PAGESZ_4M             6
+#define   PAGESZ_16M            7
+#define TLB_VALID       0x00000040      /* Entry is valid */
+
+/* Data portion */
+
+#define TLB_RPN_MASK    0xFFFFFC00      /* Real Page Number */
+#define TLB_PERM_MASK   0x00000300
+#define TLB_EX          0x00000200      /* Instruction execution allowed */
+#define TLB_WR          0x00000100      /* Writes permitted */
+#define TLB_ZSEL_MASK   0x000000F0
+#define TLB_ZSEL(x)     (((x) & 0xF) << 4)
+#define TLB_ATTR_MASK   0x0000000F
+#define TLB_W           0x00000008      /* Caching is write-through */
+#define TLB_I           0x00000004      /* Caching is inhibited */
+#define TLB_M           0x00000002      /* Memory is coherent */
+#define TLB_G           0x00000001      /* Memory is guarded from prefetch */
+
+#ifndef __ASSEMBLY__
+
+typedef unsigned long phys_addr_t;
+
+typedef struct {
+	unsigned long id;
+	unsigned long vdso_base;
+} mm_context_t;
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* _ASM_POWERPC_MMU_4XX_H_ */
--- linux-2.6.orig/include/asm-powerpc/mmu.h
+++ linux-2.6/include/asm-powerpc/mmu.h
@@ -8,6 +8,9 @@
 #elif defined(CONFIG_PPC_STD_MMU)
 /* 32-bit classic hash table MMU */
 #  include <asm/mmu-hash32.h>
+#elif defined(CONFIG_40x)
+/* 40x-style software loaded TLB */
+#  include <asm/mmu-4xx.h>
 #elif defined(CONFIG_44x)
 /* 44x-style software loaded TLB */
 #  include <asm/mmu-44x.h>
--- linux-2.6.orig/arch/powerpc/mm/4xx_mmu.c
+++ linux-2.6/arch/powerpc/mm/4xx_mmu.c
@@ -108,7 +108,7 @@ unsigned long __init mmu_mapin_ram(void)
 		pmd_t *pmdp;
 		unsigned long val = p | _PMD_SIZE_16M | _PAGE_HWEXEC | _PAGE_HWWRITE;
 
-		pmdp = pmd_offset(pgd_offset_k(v), v);
+		pmdp = pmd_offset(pud_offset(pgd_offset_k(v), v), v);
 		pmd_val(*pmdp++) = val;
 		pmd_val(*pmdp++) = val;
 		pmd_val(*pmdp++) = val;
@@ -123,7 +123,7 @@ unsigned long __init mmu_mapin_ram(void)
 		pmd_t *pmdp;
 		unsigned long val = p | _PMD_SIZE_4M | _PAGE_HWEXEC | _PAGE_HWWRITE;
 
-		pmdp = pmd_offset(pgd_offset_k(v), v);
+		pmdp = pmd_offset(pud_offset(pgd_offset_k(v), v), v);
 		pmd_val(*pmdp) = val;
 
 		v += LARGE_PAGE_SIZE_4M;