From 2b77933c28f5044629bb19e8045aae65b72b939d Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Wed, 25 Sep 2013 14:33:16 -0700 Subject: [PATCH] sparc64: Move to 64-bit PGDs and PMDs. To make the page tables compact, we were using 32-bit PGDs and PMDs. We only had to support <= 43 bits of physical addresses so this was quite feasible. In order to support larger physical addresses we have to move to 64-bit PGDs and PMDs. Most of the changes are straight-forward: 1) {pgd,pmd}_t --> unsigned long 2) Anything that tries to use plain "unsigned int" types with pgd/pmd values needs to be adjusted. In particular things like "0U" become "0UL". 3) {PGDIR,PMD}_BITS decrease by one. 4) In the assembler page table walkers, use "ldxa" instead of "lduwa" and adjust the low bit masks to clear out the low 3 bits instead of just the low 2 bits during pgd/pmd address formation. Also, use PTRS_PER_PGD and PTRS_PER_PMD in the sizing of the swapper_{pg_dir,low_pmd_dir} arrays. This patch does not try to take advantage of having 64-bits in the PMDs to simplify the hugepage code, that will come in a subsequent change. Signed-off-by: David S. Miller --- arch/sparc/include/asm/page_64.h | 25 ++++++++++++++----------- arch/sparc/include/asm/pgtable_64.h | 22 +++++++++++----------- arch/sparc/include/asm/tsb.h | 16 ++++++++-------- arch/sparc/mm/init_64.c | 2 +- 4 files changed, 34 insertions(+), 31 deletions(-) diff --git a/arch/sparc/include/asm/page_64.h b/arch/sparc/include/asm/page_64.h index 1958bfbe..aac53fc 100644 --- a/arch/sparc/include/asm/page_64.h +++ b/arch/sparc/include/asm/page_64.h @@ -56,8 +56,8 @@ extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct pag /* These are used to make use of C type-checking.. */ typedef struct { unsigned long pte; } pte_t; typedef struct { unsigned long iopte; } iopte_t; -typedef struct { unsigned int pmd; } pmd_t; -typedef struct { unsigned int pgd; } pgd_t; +typedef struct { unsigned long pmd; } pmd_t; +typedef struct { unsigned long pgd; } pgd_t; typedef struct { unsigned long pgprot; } pgprot_t; #define pte_val(x) ((x).pte) @@ -76,8 +76,8 @@ typedef struct { unsigned long pgprot; } pgprot_t; /* .. while these make it easier on the compiler */ typedef unsigned long pte_t; typedef unsigned long iopte_t; -typedef unsigned int pmd_t; -typedef unsigned int pgd_t; +typedef unsigned long pmd_t; +typedef unsigned long pgd_t; typedef unsigned long pgprot_t; #define pte_val(x) (x) @@ -97,15 +97,18 @@ typedef unsigned long pgprot_t; typedef pte_t *pgtable_t; /* These two values define the virtual address space range in which we - * must forbid 64-bit user processes from making mappings. It - * represents the virtual address space hole present in most early - * sparc64 chips including UltraSPARC-I. The next two defines specify - * the actual exclusion region we enforce, wherein we use a 4GB red - * zone on each side of the VA hole. + * must forbid 64-bit user processes from making mappings. It used to + * represent precisely the virtual address space hole present in most + * early sparc64 chips including UltraSPARC-I. But now it also is + * further constrained by the limits of our page tables, which is + * 43-bits of virtual address. */ -#define SPARC64_VA_HOLE_TOP _AC(0xfffff80000000000,UL) -#define SPARC64_VA_HOLE_BOTTOM _AC(0x0000080000000000,UL) +#define SPARC64_VA_HOLE_TOP _AC(0xfffffc0000000000,UL) +#define SPARC64_VA_HOLE_BOTTOM _AC(0x0000040000000000,UL) +/* The next two defines specify the actual exclusion region we + * enforce, wherein we use a 4GB red zone on each side of the VA hole. + */ #define VA_EXCLUDE_START (SPARC64_VA_HOLE_BOTTOM - (1UL << 32UL)) #define VA_EXCLUDE_END (SPARC64_VA_HOLE_TOP + (1UL << 32UL)) diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index 012b6ee..eee803e 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -51,15 +51,15 @@ #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3)) #define PMD_SIZE (_AC(1,UL) << PMD_SHIFT) #define PMD_MASK (~(PMD_SIZE-1)) -#define PMD_BITS (PAGE_SHIFT - 2) +#define PMD_BITS (PAGE_SHIFT - 3) /* PGDIR_SHIFT determines what a third-level page table entry can map */ #define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3) + PMD_BITS) #define PGDIR_SIZE (_AC(1,UL) << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) -#define PGDIR_BITS (PAGE_SHIFT - 2) +#define PGDIR_BITS (PAGE_SHIFT - 3) -#if (PGDIR_SHIFT + PGDIR_BITS) != 45 +#if (PGDIR_SHIFT + PGDIR_BITS) != 43 #error Page table parameters do not cover virtual address space properly. #endif @@ -714,7 +714,7 @@ extern pgprot_t pmd_pgprot(pmd_t entry); static inline int pmd_present(pmd_t pmd) { - return pmd_val(pmd) != 0U; + return pmd_val(pmd) != 0UL; } #define pmd_none(pmd) (!pmd_val(pmd)) @@ -741,7 +741,7 @@ static inline void pmd_set(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) (pud_val(*(pudp)) = (__pa((unsigned long) (pmdp)) >> PGD_PADDR_SHIFT)) static inline unsigned long __pmd_page(pmd_t pmd) { - unsigned long paddr = (unsigned long) pmd_val(pmd); + unsigned long paddr = pmd_val(pmd); #ifdef CONFIG_TRANSPARENT_HUGEPAGE if (pmd_val(pmd) & PMD_ISHUGE) paddr &= PMD_HUGE_PADDR; @@ -751,14 +751,14 @@ static inline unsigned long __pmd_page(pmd_t pmd) } #define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd)) #define pud_page_vaddr(pud) \ - ((unsigned long) __va((((unsigned long)pud_val(pud))<