| #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)) |
| |
| /* |
| * KERNELBASE is the virtual address of the start of the kernel, it's often |
| * the same as PAGE_OFFSET, but _might not be_. |
| * |
| * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET. |
| * |
| * To get a physical address from a virtual one you subtract PAGE_OFFSET, |
| * _not_ KERNELBASE. |
| * |
| * If you want to know something's offset from the start of the kernel you |
| * should subtract KERNELBASE. |
| * |
| * If you want to test if something's a kernel address, use is_kernel_addr(). |
| */ |
| |
| #ifdef CONFIG_CRASH_DUMP |
| /* Kdump kernel runs at 32 MB, change at your peril. */ |
| #define PHYSICAL_START 0x2000000 |
| #else |
| #define PHYSICAL_START 0x0 |
| #endif |
| |
| #define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START) |
| #define KERNELBASE (PAGE_OFFSET + PHYSICAL_START) |
| |
| #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_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) + PAGE_OFFSET)) |
| #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) |
| |
| /* |
| * Don't compare things with KERNELBASE or PAGE_OFFSET to test for |
| * "kernelness", use is_kernel_addr() - it should do what you want. |
| */ |
| #define is_kernel_addr(x) ((x) >= PAGE_OFFSET) |
| |
| #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) |
| |
| #if defined(CONFIG_PPC64) && !defined(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); |
| |
| #include <asm-generic/memory_model.h> |
| #endif /* __ASSEMBLY__ */ |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _ASM_POWERPC_PAGE_H */ |