[PATCH] ppc32: Support 36-bit physical addressing on e500

To add support for 36-bit physical addressing on e500 the following changes
have been made.  The changes are generalized to support any physical address
size larger than 32-bits:

* Allow FSL Book-E parts to use a 64-bit PTE, it is 44-bits of pfn, 20-bits
  of flags.

* Introduced new CPU feature (CPU_FTR_BIG_PHYS) to allow runtime handling of
  updating hardware register (SPRN_MAS7) which holds the upper 32-bits of
  physical address that will be written into the TLB.  This is useful since
  not all e500 cores support 36-bit physical addressing.

* Currently have a pass through implementation of fixup_bigphys_addr

* Moved _PAGE_DIRTY in the 64-bit PTE case to free room for three additional
  storage attributes that may exist in future FSL Book-E cores and updated
  fault handler to copy these bits into the hardware TLBs.

Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-ppc/cputable.h

@@ -86,8 +86,9 @@ static inline unsigned int cpu_has_feature(unsigned int feature)
 #define CPU_FTR_DUAL_PLL_750FX		0x00004000
 #define CPU_FTR_NO_DPM			0x00008000
 #define CPU_FTR_HAS_HIGH_BATS		0x00010000
-#define CPU_FTR_NEED_COHERENT           0x00020000
+#define CPU_FTR_NEED_COHERENT		0x00020000
 #define CPU_FTR_NO_BTIC			0x00040000
+#define CPU_FTR_BIG_PHYS		0x00080000
 
 #ifdef __ASSEMBLY__
 

include/asm-ppc/pgtable.h

@@ -225,8 +225,7 @@ extern unsigned long ioremap_bot, ioremap_base;
 /* ERPN in a PTE never gets cleared, ignore it */
 #define _PTE_NONE_MASK	0xffffffff00000000ULL
 
-#elif defined(CONFIG_E500)
-
+#elif defined(CONFIG_FSL_BOOKE)
 /*
    MMU Assist Register 3:
 
@@ -240,21 +239,29 @@ extern unsigned long ioremap_bot, ioremap_base;
      entries use the top 29 bits.
 */
 
-/* Definitions for e500 core */
-#define _PAGE_PRESENT	0x001	/* S: PTE contains a translation */
-#define _PAGE_USER	0x002	/* S: User page (maps to UR) */
-#define _PAGE_FILE	0x002	/* S: when !present: nonlinear file mapping */
-#define _PAGE_ACCESSED	0x004	/* S: Page referenced */
-#define _PAGE_HWWRITE	0x008	/* H: Dirty & RW, set in exception */
-#define _PAGE_RW	0x010	/* S: Write permission */
-#define _PAGE_HWEXEC	0x020	/* H: UX permission */
+/* Definitions for FSL Book-E Cores */
+#define _PAGE_PRESENT	0x00001	/* S: PTE contains a translation */
+#define _PAGE_USER	0x00002	/* S: User page (maps to UR) */
+#define _PAGE_FILE	0x00002	/* S: when !present: nonlinear file mapping */
+#define _PAGE_ACCESSED	0x00004	/* S: Page referenced */
+#define _PAGE_HWWRITE	0x00008	/* H: Dirty & RW, set in exception */
+#define _PAGE_RW	0x00010	/* S: Write permission */
+#define _PAGE_HWEXEC	0x00020	/* H: UX permission */
 
-#define _PAGE_ENDIAN	0x040	/* H: E bit */
-#define _PAGE_GUARDED	0x080	/* H: G bit */
-#define _PAGE_COHERENT	0x100	/* H: M bit */
-#define _PAGE_NO_CACHE	0x200	/* H: I bit */
-#define _PAGE_WRITETHRU	0x400	/* H: W bit */
-#define _PAGE_DIRTY	0x800	/* S: Page dirty */
+#define _PAGE_ENDIAN	0x00040	/* H: E bit */
+#define _PAGE_GUARDED	0x00080	/* H: G bit */
+#define _PAGE_COHERENT	0x00100	/* H: M bit */
+#define _PAGE_NO_CACHE	0x00200	/* H: I bit */
+#define _PAGE_WRITETHRU	0x00400	/* H: W bit */
+
+#ifdef CONFIG_PTE_64BIT
+#define _PAGE_DIRTY	0x08000	/* S: Page dirty */
+
+/* ERPN in a PTE never gets cleared, ignore it */
+#define _PTE_NONE_MASK	0xffffffffffff0000ULL
+#else
+#define _PAGE_DIRTY	0x00800	/* S: Page dirty */
+#endif
 
 #define _PMD_PRESENT	0
 #define _PMD_PRESENT_MASK (PAGE_MASK)
@@ -433,7 +440,11 @@ extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
 
 /* in some case we want to additionaly adjust where the pfn is in the pte to
  * allow room for more flags */
+#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_PTE_64BIT)
+#define PFN_SHIFT_OFFSET	(PAGE_SHIFT + 8)
+#else
 #define PFN_SHIFT_OFFSET	(PAGE_SHIFT)
+#endif
 
 #define pte_pfn(x)		(pte_val(x) >> PFN_SHIFT_OFFSET)
 #define pte_page(x)		pfn_to_page(pte_pfn(x))

include/asm-ppc/reg_booke.h

@@ -172,6 +172,7 @@ do {						\
 #define SPRN_MAS4	0x274	/* MMU Assist Register 4 */
 #define SPRN_MAS5	0x275	/* MMU Assist Register 5 */
 #define SPRN_MAS6	0x276	/* MMU Assist Register 6 */
+#define SPRN_MAS7	0x3b0	/* MMU Assist Register 7 */
 #define SPRN_PID1	0x279	/* Process ID Register 1 */
 #define SPRN_PID2	0x27A	/* Process ID Register 2 */
 #define SPRN_TLB0CFG	0x2B0	/* TLB 0 Config Register */