From 2fd83038160531245099c3c5b3511fa4b80765eb Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Thu, 20 Apr 2006 20:40:23 +0000 Subject: [PARISC] Further work for multiple page sizes More work towards supporing multiple page sizes on 64-bit. Convert some assumptions that 64bit uses 3 level page tables into testing PT_NLEVELS. Also some BUG() to BUG_ON() conversions and some cleanups to assembler. Signed-off-by: Helge Deller Signed-off-by: Kyle McMartin --- include/asm-parisc/pgtable.h | 63 +++++++++++++++++++++++++++++++------------- 1 file changed, 44 insertions(+), 19 deletions(-) (limited to 'include/asm-parisc/pgtable.h') diff --git a/include/asm-parisc/pgtable.h b/include/asm-parisc/pgtable.h index 4e34c6b44059..aec089eb8b85 100644 --- a/include/asm-parisc/pgtable.h +++ b/include/asm-parisc/pgtable.h @@ -59,16 +59,15 @@ #define ISTACK_SIZE 32768 /* Interrupt Stack Size */ #define ISTACK_ORDER 3 -/* This is the size of the initially mapped kernel memory (i.e. currently - * 0 to 1<<23 == 8MB */ +/* This is the size of the initially mapped kernel memory */ #ifdef CONFIG_64BIT -#define KERNEL_INITIAL_ORDER 24 +#define KERNEL_INITIAL_ORDER 24 /* 0 to 1<<24 = 16MB */ #else -#define KERNEL_INITIAL_ORDER 23 +#define KERNEL_INITIAL_ORDER 23 /* 0 to 1<<23 = 8MB */ #endif #define KERNEL_INITIAL_SIZE (1 << KERNEL_INITIAL_ORDER) -#ifdef CONFIG_64BIT +#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB) #define PT_NLEVELS 3 #define PGD_ORDER 1 /* Number of pages per pgd */ #define PMD_ORDER 1 /* Number of pages per pmd */ @@ -111,11 +110,15 @@ #define MAX_ADDRBITS (PGDIR_SHIFT + BITS_PER_PGD) #define MAX_ADDRESS (1UL << MAX_ADDRBITS) -#define SPACEID_SHIFT (MAX_ADDRBITS - 32) +#define SPACEID_SHIFT (MAX_ADDRBITS - 32) /* This calculates the number of initial pages we need for the initial * page tables */ -#define PT_INITIAL (1 << (KERNEL_INITIAL_ORDER - PMD_SHIFT)) +#if (KERNEL_INITIAL_ORDER) >= (PMD_SHIFT) +# define PT_INITIAL (1 << (KERNEL_INITIAL_ORDER - PMD_SHIFT)) +#else +# define PT_INITIAL (1) /* all initial PTEs fit into one page */ +#endif /* * pgd entries used up by user/kernel: @@ -160,6 +163,10 @@ extern void *vmalloc_start; * to zero */ #define PTE_SHIFT xlate_pabit(_PAGE_USER_BIT) +/* PFN_PTE_SHIFT defines the shift of a PTE value to access the PFN field */ +#define PFN_PTE_SHIFT 12 + + /* this is how many bits may be used by the file functions */ #define PTE_FILE_MAX_BITS (BITS_PER_LONG - PTE_SHIFT) @@ -188,7 +195,8 @@ extern void *vmalloc_start; /* The pgd/pmd contains a ptr (in phys addr space); since all pgds/pmds * are page-aligned, we don't care about the PAGE_OFFSET bits, except * for a few meta-information bits, so we shift the address to be - * able to effectively address 40-bits of physical address space. */ + * able to effectively address 40/42/44-bits of physical address space + * depending on 4k/16k/64k PAGE_SIZE */ #define _PxD_PRESENT_BIT 31 #define _PxD_ATTACHED_BIT 30 #define _PxD_VALID_BIT 29 @@ -198,7 +206,7 @@ extern void *vmalloc_start; #define PxD_FLAG_VALID (1 << xlate_pabit(_PxD_VALID_BIT)) #define PxD_FLAG_MASK (0xf) #define PxD_FLAG_SHIFT (4) -#define PxD_VALUE_SHIFT (8) +#define PxD_VALUE_SHIFT (8) /* (PAGE_SHIFT-PxD_FLAG_SHIFT) */ #ifndef __ASSEMBLY__ @@ -246,6 +254,7 @@ extern void *vmalloc_start; #define __S110 PAGE_RWX #define __S111 PAGE_RWX + extern pgd_t swapper_pg_dir[]; /* declared in init_task.c */ /* initial page tables for 0-8MB for kernel */ @@ -272,7 +281,7 @@ extern unsigned long *empty_zero_page; #define pgd_flag(x) (pgd_val(x) & PxD_FLAG_MASK) #define pgd_address(x) ((unsigned long)(pgd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT) -#ifdef CONFIG_64BIT +#if PT_NLEVELS == 3 /* The first entry of the permanent pmd is not there if it contains * the gateway marker */ #define pmd_none(x) (!pmd_val(x) || pmd_flag(x) == PxD_FLAG_ATTACHED) @@ -282,7 +291,7 @@ extern unsigned long *empty_zero_page; #define pmd_bad(x) (!(pmd_flag(x) & PxD_FLAG_VALID)) #define pmd_present(x) (pmd_flag(x) & PxD_FLAG_PRESENT) static inline void pmd_clear(pmd_t *pmd) { -#ifdef CONFIG_64BIT +#if PT_NLEVELS == 3 if (pmd_flag(*pmd) & PxD_FLAG_ATTACHED) /* This is the entry pointing to the permanent pmd * attached to the pgd; cannot clear it */ @@ -303,7 +312,7 @@ static inline void pmd_clear(pmd_t *pmd) { #define pgd_bad(x) (!(pgd_flag(x) & PxD_FLAG_VALID)) #define pgd_present(x) (pgd_flag(x) & PxD_FLAG_PRESENT) static inline void pgd_clear(pgd_t *pgd) { -#ifdef CONFIG_64BIT +#if PT_NLEVELS == 3 if(pgd_flag(*pgd) & PxD_FLAG_ATTACHED) /* This is the permanent pmd attached to the pgd; cannot * free it */ @@ -351,7 +360,7 @@ extern inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= _PAGE_WRITE; return ({ \ pte_t __pte; \ \ - pte_val(__pte) = ((addr)+pgprot_val(pgprot)); \ + pte_val(__pte) = ((((addr)>>PAGE_SHIFT)<> PAGE_SHIFT) +#define pte_pfn(x) (pte_val(x) >> PFN_PTE_SHIFT) #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) @@ -499,6 +504,26 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, #endif /* !__ASSEMBLY__ */ + +/* TLB page size encoding - see table 3-1 in parisc20.pdf */ +#define _PAGE_SIZE_ENCODING_4K 0 +#define _PAGE_SIZE_ENCODING_16K 1 +#define _PAGE_SIZE_ENCODING_64K 2 +#define _PAGE_SIZE_ENCODING_256K 3 +#define _PAGE_SIZE_ENCODING_1M 4 +#define _PAGE_SIZE_ENCODING_4M 5 +#define _PAGE_SIZE_ENCODING_16M 6 +#define _PAGE_SIZE_ENCODING_64M 7 + +#if defined(CONFIG_PARISC_PAGE_SIZE_4KB) +# define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4K +#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB) +# define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16K +#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB) +# define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_64K +#endif + + #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ remap_pfn_range(vma, vaddr, pfn, size, prot) -- cgit v1.2.1