1#ifndef _PPC_PAGE_H 2#define _PPC_PAGE_H 3 4#include <asm/asm-compat.h> 5 6/* PAGE_SHIFT determines the page size */ 7#define PAGE_SHIFT 12 8#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT) 9 10/* 11 * Subtle: this is an int (not an unsigned long) and so it 12 * gets extended to 64 bits the way want (i.e. with 1s). -- paulus 13 */ 14#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) 15 16#ifdef __KERNEL__ 17 18/* This must match what is in arch/ppc/Makefile */ 19#define PAGE_OFFSET CONFIG_KERNEL_START 20#define KERNELBASE PAGE_OFFSET 21#define is_kernel_addr(x) ((x) >= PAGE_OFFSET) 22 23#ifndef __ASSEMBLY__ 24 25/* 26 * The basic type of a PTE - 64 bits for those CPUs with > 32 bit 27 * physical addressing. For now this just the IBM PPC440. 28 */ 29#ifdef CONFIG_PTE_64BIT 30typedef unsigned long long pte_basic_t; 31#define PTE_SHIFT (PAGE_SHIFT - 3) /* 512 ptes per page */ 32#define PTE_FMT "%16Lx" 33#else 34typedef unsigned long pte_basic_t; 35#define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */ 36#define PTE_FMT "%.8lx" 37#endif 38 39/* align addr on a size boundary - adjust address up/down if needed */ 40#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1))) 41#define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1))) 42 43/* align addr on a size boundary - adjust address up if needed */ 44#define _ALIGN(addr,size) _ALIGN_UP(addr,size) 45 46/* to align the pointer to the (next) page boundary */ 47#define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE) 48 49 50#undef STRICT_MM_TYPECHECKS 51 52#ifdef STRICT_MM_TYPECHECKS 53/* 54 * These are used to make use of C type-checking.. 55 */ 56typedef struct { pte_basic_t pte; } pte_t; 57typedef struct { unsigned long pmd; } pmd_t; 58typedef struct { unsigned long pgd; } pgd_t; 59typedef struct { unsigned long pgprot; } pgprot_t; 60 61#define pte_val(x) ((x).pte) 62#define pmd_val(x) ((x).pmd) 63#define pgd_val(x) ((x).pgd) 64#define pgprot_val(x) ((x).pgprot) 65 66#define __pte(x) ((pte_t) { (x) } ) 67#define __pmd(x) ((pmd_t) { (x) } ) 68#define __pgd(x) ((pgd_t) { (x) } ) 69#define __pgprot(x) ((pgprot_t) { (x) } ) 70 71#else 72/* 73 * .. while these make it easier on the compiler 74 */ 75typedef pte_basic_t pte_t; 76typedef unsigned long pmd_t; 77typedef unsigned long pgd_t; 78typedef unsigned long pgprot_t; 79 80#define pte_val(x) (x) 81#define pmd_val(x) (x) 82#define pgd_val(x) (x) 83#define pgprot_val(x) (x) 84 85#define __pte(x) (x) 86#define __pmd(x) (x) 87#define __pgd(x) (x) 88#define __pgprot(x) (x) 89 90#endif 91 92struct page; 93extern void clear_pages(void *page, int order); 94static inline void clear_page(void *page) { clear_pages(page, 0); } 95extern void copy_page(void *to, void *from); 96extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); 97extern void copy_user_page(void *to, void *from, unsigned long vaddr, 98 struct page *pg); 99 100#ifndef CONFIG_APUS 101#define PPC_MEMSTART 0 102#define PPC_PGSTART 0 103#define PPC_MEMOFFSET PAGE_OFFSET 104#else 105extern unsigned long ppc_memstart; 106extern unsigned long ppc_pgstart; 107extern unsigned long ppc_memoffset; 108#define PPC_MEMSTART ppc_memstart 109#define PPC_PGSTART ppc_pgstart 110#define PPC_MEMOFFSET ppc_memoffset 111#endif 112 113#if defined(CONFIG_APUS) && !defined(MODULE) 114/* map phys->virtual and virtual->phys for RAM pages */ 115static inline unsigned long ___pa(unsigned long v) 116{ 117 unsigned long p; 118 asm volatile ("1: addis %0, %1, %2;" 119 ".section \".vtop_fixup\",\"aw\";" 120 ".align 1;" 121 ".long 1b;" 122 ".previous;" 123 : "=r" (p) 124 : "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff)); 125 126 return p; 127} 128static inline void* ___va(unsigned long p) 129{ 130 unsigned long v; 131 asm volatile ("1: addis %0, %1, %2;" 132 ".section \".ptov_fixup\",\"aw\";" 133 ".align 1;" 134 ".long 1b;" 135 ".previous;" 136 : "=r" (v) 137 : "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff)); 138 139 return (void*) v; 140} 141#else 142#define ___pa(vaddr) ((vaddr)-PPC_MEMOFFSET) 143#define ___va(paddr) ((paddr)+PPC_MEMOFFSET) 144#endif 145 146extern int page_is_ram(unsigned long pfn); 147 148#define __pa(x) ___pa((unsigned long)(x)) 149#define __va(x) ((void *)(___va((unsigned long)(x)))) 150 151#define ARCH_PFN_OFFSET (PPC_PGSTART) 152#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 153#define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT) 154 155#define pfn_valid(pfn) (((pfn) - PPC_PGSTART) < max_mapnr) 156#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 157 158/* Pure 2^n version of get_order */ 159extern __inline__ int get_order(unsigned long size) 160{ 161 int lz; 162 163 size = (size-1) >> PAGE_SHIFT; 164 asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size)); 165 return 32 - lz; 166} 167 168#endif /* __ASSEMBLY__ */ 169 170#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 171 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 172 173/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */ 174#define __HAVE_ARCH_GATE_AREA 1 175 176#include <asm-generic/memory_model.h> 177#endif /* __KERNEL__ */ 178#endif /* _PPC_PAGE_H */ 179