#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 <asm/asm-compat.h> #include <asm/kdump.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(). */ #define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START) #define KERNELBASE (PAGE_OFFSET + PHYSICAL_START) #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 */ #ifdef CONFIG_PPC64 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 /* !CONFIG_PPC_64K_PAGES */ #endif /* CONFIG_PPC64 */ /* 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 #ifdef CONFIG_PPC64 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 /* !CONFIG_PPC_64K_PAGES */ #endif /* CONFIG_PPC64 */ 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); struct vm_area_struct; extern const char *arch_vma_name(struct vm_area_struct *vma); #include <asm-generic/memory_model.h> #endif /* __ASSEMBLY__ */ #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_PAGE_H */