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Diffstat (limited to 'include/asm-powerpc/page.h')
| -rw-r--r-- | include/asm-powerpc/page.h | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/include/asm-powerpc/page.h b/include/asm-powerpc/page.h new file mode 100644 index 000000000000..18c1e5ee81a3 --- /dev/null +++ b/include/asm-powerpc/page.h @@ -0,0 +1,179 @@ +#ifndef _ASM_POWERPC_PAGE_H +#define _ASM_POWERPC_PAGE_H + +/* + * Copyright (C) 2001,2005 IBM Corporation. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#ifdef __KERNEL__ +#include <linux/config.h> +#include <asm/asm-compat.h> + +/* + * On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software + * page size. When using 64K pages however, whether we are really supporting + * 64K pages in HW or not is irrelevant to those definitions. + */ +#ifdef CONFIG_PPC_64K_PAGES +#define PAGE_SHIFT 16 +#else +#define PAGE_SHIFT 12 +#endif + +#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT) + +/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */ +#define __HAVE_ARCH_GATE_AREA 1 + +/* + * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we + * assign PAGE_MASK to a larger type it gets extended the way we want + * (i.e. with 1s in the high bits) + */ +#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) + +#define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START) +#define KERNELBASE PAGE_OFFSET + +#ifdef CONFIG_DISCONTIGMEM +#define page_to_pfn(page) discontigmem_page_to_pfn(page) +#define pfn_to_page(pfn) discontigmem_pfn_to_page(pfn) +#define pfn_valid(pfn) discontigmem_pfn_valid(pfn) +#endif + +#ifdef CONFIG_FLATMEM +#define pfn_to_page(pfn) (mem_map + (pfn)) +#define page_to_pfn(page) ((unsigned long)((page) - mem_map)) +#define pfn_valid(pfn) ((pfn) < max_mapnr) +#endif + +#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) +#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) +#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) + +#define __va(x) ((void *)((unsigned long)(x) + KERNELBASE)) +#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET) + +/* + * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI, + * and needs to be executable. This means the whole heap ends + * up being executable. + */ +#define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \ + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) + +#define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) + +#ifdef __powerpc64__ +#include <asm/page_64.h> +#else +#include <asm/page_32.h> +#endif + +/* align addr on a size boundary - adjust address up/down if needed */ +#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1))) +#define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1))) + +/* align addr on a size boundary - adjust address up if needed */ +#define _ALIGN(addr,size) _ALIGN_UP(addr,size) + +/* to align the pointer to the (next) page boundary */ +#define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE) + +#ifndef __ASSEMBLY__ + +#undef STRICT_MM_TYPECHECKS + +#ifdef STRICT_MM_TYPECHECKS +/* These are used to make use of C type-checking. */ + +/* PTE level */ +typedef struct { pte_basic_t pte; } pte_t; +#define pte_val(x) ((x).pte) +#define __pte(x) ((pte_t) { (x) }) + +/* 64k pages additionally define a bigger "real PTE" type that gathers + * the "second half" part of the PTE for pseudo 64k pages + */ +#ifdef CONFIG_PPC_64K_PAGES +typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; +#else +typedef struct { pte_t pte; } real_pte_t; +#endif + +/* PMD level */ +typedef struct { unsigned long pmd; } pmd_t; +#define pmd_val(x) ((x).pmd) +#define __pmd(x) ((pmd_t) { (x) }) + +/* PUD level exusts only on 4k pages */ +#ifndef CONFIG_PPC_64K_PAGES +typedef struct { unsigned long pud; } pud_t; +#define pud_val(x) ((x).pud) +#define __pud(x) ((pud_t) { (x) }) +#endif + +/* PGD level */ +typedef struct { unsigned long pgd; } pgd_t; +#define pgd_val(x) ((x).pgd) +#define __pgd(x) ((pgd_t) { (x) }) + +/* Page protection bits */ +typedef struct { unsigned long pgprot; } pgprot_t; +#define pgprot_val(x) ((x).pgprot) +#define __pgprot(x) ((pgprot_t) { (x) }) + +#else + +/* + * .. while these make it easier on the compiler + */ + +typedef pte_basic_t pte_t; +#define pte_val(x) (x) +#define __pte(x) (x) + +#ifdef CONFIG_PPC_64K_PAGES +typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; +#else +typedef unsigned long real_pte_t; +#endif + + +typedef unsigned long pmd_t; +#define pmd_val(x) (x) +#define __pmd(x) (x) + +#ifndef CONFIG_PPC_64K_PAGES +typedef unsigned long pud_t; +#define pud_val(x) (x) +#define __pud(x) (x) +#endif + +typedef unsigned long pgd_t; +#define pgd_val(x) (x) +#define pgprot_val(x) (x) + +typedef unsigned long pgprot_t; +#define __pgd(x) (x) +#define __pgprot(x) (x) + +#endif + +struct page; +extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); +extern void copy_user_page(void *to, void *from, unsigned long vaddr, + struct page *p); +extern int page_is_ram(unsigned long pfn); + +#endif /* __ASSEMBLY__ */ + +#endif /* __KERNEL__ */ + +#endif /* _ASM_POWERPC_PAGE_H */ |