1#ifndef _M68K_PGTABLE_H 2#define _M68K_PGTABLE_H 3 4#include <asm-generic/4level-fixup.h> 5 6#include <asm/setup.h> 7 8#ifndef __ASSEMBLY__ 9#include <asm/processor.h> 10#include <linux/sched.h> 11#include <linux/threads.h> 12 13/* 14 * This file contains the functions and defines necessary to modify and use 15 * the m68k page table tree. 16 */ 17 18#include <asm/virtconvert.h> 19 20/* Certain architectures need to do special things when pte's 21 * within a page table are directly modified. Thus, the following 22 * hook is made available. 23 */ 24#define set_pte(pteptr, pteval) \ 25 do{ \ 26 *(pteptr) = (pteval); \ 27 } while(0) 28#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) 29 30 31/* PMD_SHIFT determines the size of the area a second-level page table can map */ 32#ifdef CONFIG_SUN3 33#define PMD_SHIFT 17 34#else 35#define PMD_SHIFT 22 36#endif 37#define PMD_SIZE (1UL << PMD_SHIFT) 38#define PMD_MASK (~(PMD_SIZE-1)) 39 40/* PGDIR_SHIFT determines what a third-level page table entry can map */ 41#ifdef CONFIG_SUN3 42#define PGDIR_SHIFT 17 43#elif defined(CONFIG_COLDFIRE) 44#define PGDIR_SHIFT 22 45#else 46#define PGDIR_SHIFT 25 47#endif 48#define PGDIR_SIZE (1UL << PGDIR_SHIFT) 49#define PGDIR_MASK (~(PGDIR_SIZE-1)) 50 51/* 52 * entries per page directory level: the m68k is configured as three-level, 53 * so we do have PMD level physically. 54 */ 55#ifdef CONFIG_SUN3 56#define PTRS_PER_PTE 16 57#define __PAGETABLE_PMD_FOLDED 58#define PTRS_PER_PMD 1 59#define PTRS_PER_PGD 2048 60#elif defined(CONFIG_COLDFIRE) 61#define PTRS_PER_PTE 512 62#define __PAGETABLE_PMD_FOLDED 63#define PTRS_PER_PMD 1 64#define PTRS_PER_PGD 1024 65#else 66#define PTRS_PER_PTE 1024 67#define PTRS_PER_PMD 8 68#define PTRS_PER_PGD 128 69#endif 70#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE) 71#define FIRST_USER_ADDRESS 0UL 72 73/* Virtual address region for use by kernel_map() */ 74#ifdef CONFIG_SUN3 75#define KMAP_START 0x0DC00000 76#define KMAP_END 0x0E000000 77#elif defined(CONFIG_COLDFIRE) 78#define KMAP_START 0xe0000000 79#define KMAP_END 0xf0000000 80#else 81#define KMAP_START 0xd0000000 82#define KMAP_END 0xf0000000 83#endif 84 85#ifdef CONFIG_SUN3 86extern unsigned long m68k_vmalloc_end; 87#define VMALLOC_START 0x0f800000 88#define VMALLOC_END m68k_vmalloc_end 89#elif defined(CONFIG_COLDFIRE) 90#define VMALLOC_START 0xd0000000 91#define VMALLOC_END 0xe0000000 92#else 93/* Just any arbitrary offset to the start of the vmalloc VM area: the 94 * current 8MB value just means that there will be a 8MB "hole" after the 95 * physical memory until the kernel virtual memory starts. That means that 96 * any out-of-bounds memory accesses will hopefully be caught. 97 * The vmalloc() routines leaves a hole of 4kB between each vmalloced 98 * area for the same reason. ;) 99 */ 100#define VMALLOC_OFFSET (8*1024*1024) 101#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) 102#define VMALLOC_END KMAP_START 103#endif 104 105/* zero page used for uninitialized stuff */ 106extern void *empty_zero_page; 107 108/* 109 * ZERO_PAGE is a global shared page that is always zero: used 110 * for zero-mapped memory areas etc.. 111 */ 112#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 113 114/* number of bits that fit into a memory pointer */ 115#define BITS_PER_PTR (8*sizeof(unsigned long)) 116 117/* to align the pointer to a pointer address */ 118#define PTR_MASK (~(sizeof(void*)-1)) 119 120/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */ 121/* 64-bit machines, beware! SRB. */ 122#define SIZEOF_PTR_LOG2 2 123 124extern void kernel_set_cachemode(void *addr, unsigned long size, int cmode); 125 126/* 127 * The m68k doesn't have any external MMU info: the kernel page 128 * tables contain all the necessary information. The Sun3 does, but 129 * they are updated on demand. 130 */ 131static inline void update_mmu_cache(struct vm_area_struct *vma, 132 unsigned long address, pte_t *ptep) 133{ 134} 135 136#endif /* !__ASSEMBLY__ */ 137 138#define kern_addr_valid(addr) (1) 139 140/* MMU-specific headers */ 141 142#ifdef CONFIG_SUN3 143#include <asm/sun3_pgtable.h> 144#elif defined(CONFIG_COLDFIRE) 145#include <asm/mcf_pgtable.h> 146#else 147#include <asm/motorola_pgtable.h> 148#endif 149 150#ifndef __ASSEMBLY__ 151/* 152 * Macro to mark a page protection value as "uncacheable". 153 */ 154#ifdef CONFIG_COLDFIRE 155# define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | CF_PAGE_NOCACHE)) 156#else 157#ifdef SUN3_PAGE_NOCACHE 158# define __SUN3_PAGE_NOCACHE SUN3_PAGE_NOCACHE 159#else 160# define __SUN3_PAGE_NOCACHE 0 161#endif 162#define pgprot_noncached(prot) \ 163 (MMU_IS_SUN3 \ 164 ? (__pgprot(pgprot_val(prot) | __SUN3_PAGE_NOCACHE)) \ 165 : ((MMU_IS_851 || MMU_IS_030) \ 166 ? (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE030)) \ 167 : (MMU_IS_040 || MMU_IS_060) \ 168 ? (__pgprot((pgprot_val(prot) & _CACHEMASK040) | _PAGE_NOCACHE_S)) \ 169 : (prot))) 170 171#endif /* CONFIG_COLDFIRE */ 172#include <asm-generic/pgtable.h> 173#endif /* !__ASSEMBLY__ */ 174 175/* 176 * No page table caches to initialise 177 */ 178#define pgtable_cache_init() do { } while (0) 179 180#define check_pgt_cache() do { } while (0) 181 182#endif /* _M68K_PGTABLE_H */ 183