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Diffstat (limited to 'include/asm-m68k/pgtable.h')
| -rw-r--r-- | include/asm-m68k/pgtable.h | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/include/asm-m68k/pgtable.h b/include/asm-m68k/pgtable.h new file mode 100644 index 00000000000..0eef32778df --- /dev/null +++ b/include/asm-m68k/pgtable.h @@ -0,0 +1,191 @@ +#ifndef _M68K_PGTABLE_H +#define _M68K_PGTABLE_H + +#include <asm-generic/4level-fixup.h> + +#include <linux/config.h> +#include <asm/setup.h> + +#ifndef __ASSEMBLY__ +#include <asm/processor.h> +#include <linux/sched.h> +#include <linux/threads.h> + +/* + * This file contains the functions and defines necessary to modify and use + * the m68k page table tree. + */ + +#include <asm/virtconvert.h> + +/* Certain architectures need to do special things when pte's + * within a page table are directly modified. Thus, the following + * hook is made available. + */ +#define set_pte(pteptr, pteval) \ + do{ \ + *(pteptr) = (pteval); \ + } while(0) +#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) + + +/* PMD_SHIFT determines the size of the area a second-level page table can map */ +#ifdef CONFIG_SUN3 +#define PMD_SHIFT 17 +#else +#define PMD_SHIFT 22 +#endif +#define PMD_SIZE (1UL << PMD_SHIFT) +#define PMD_MASK (~(PMD_SIZE-1)) + +/* PGDIR_SHIFT determines what a third-level page table entry can map */ +#ifdef CONFIG_SUN3 +#define PGDIR_SHIFT 17 +#else +#define PGDIR_SHIFT 25 +#endif +#define PGDIR_SIZE (1UL << PGDIR_SHIFT) +#define PGDIR_MASK (~(PGDIR_SIZE-1)) + +/* + * entries per page directory level: the m68k is configured as three-level, + * so we do have PMD level physically. + */ +#ifdef CONFIG_SUN3 +#define PTRS_PER_PTE 16 +#define PTRS_PER_PMD 1 +#define PTRS_PER_PGD 2048 +#else +#define PTRS_PER_PTE 1024 +#define PTRS_PER_PMD 8 +#define PTRS_PER_PGD 128 +#endif +#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE) +#define FIRST_USER_PGD_NR 0 + +/* Virtual address region for use by kernel_map() */ +#ifdef CONFIG_SUN3 +#define KMAP_START 0x0DC00000 +#define KMAP_END 0x0E000000 +#else +#define KMAP_START 0xd0000000 +#define KMAP_END 0xf0000000 +#endif + +#ifndef CONFIG_SUN3 +/* Just any arbitrary offset to the start of the vmalloc VM area: the + * current 8MB value just means that there will be a 8MB "hole" after the + * physical memory until the kernel virtual memory starts. That means that + * any out-of-bounds memory accesses will hopefully be caught. + * The vmalloc() routines leaves a hole of 4kB between each vmalloced + * area for the same reason. ;) + */ +#define VMALLOC_OFFSET (8*1024*1024) +#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) +#define VMALLOC_END KMAP_START +#else +extern unsigned long vmalloc_end; +#define VMALLOC_START 0x0f800000 +#define VMALLOC_END vmalloc_end +#endif /* CONFIG_SUN3 */ + +/* zero page used for uninitialized stuff */ +extern void *empty_zero_page; + +/* + * ZERO_PAGE is a global shared page that is always zero: used + * for zero-mapped memory areas etc.. + */ +#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) + +/* number of bits that fit into a memory pointer */ +#define BITS_PER_PTR (8*sizeof(unsigned long)) + +/* to align the pointer to a pointer address */ +#define PTR_MASK (~(sizeof(void*)-1)) + +/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */ +/* 64-bit machines, beware! SRB. */ +#define SIZEOF_PTR_LOG2 2 + +/* + * Check if the addr/len goes up to the end of a physical + * memory chunk. Used for DMA functions. + */ +#ifdef CONFIG_SINGLE_MEMORY_CHUNK +/* + * It makes no sense to consider whether we cross a memory boundary if + * we support just one physical chunk of memory. + */ +static inline int mm_end_of_chunk(unsigned long addr, int len) +{ + return 0; +} +#else +int mm_end_of_chunk (unsigned long addr, int len); +#endif + +extern void kernel_set_cachemode(void *addr, unsigned long size, int cmode); + +/* + * The m68k doesn't have any external MMU info: the kernel page + * tables contain all the necessary information. The Sun3 does, but + * they are updated on demand. + */ +static inline void update_mmu_cache(struct vm_area_struct *vma, + unsigned long address, pte_t pte) +{ +} + +#endif /* !__ASSEMBLY__ */ + +#define kern_addr_valid(addr) (1) + +#define io_remap_page_range(vma, vaddr, paddr, size, prot) \ + remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot) + +#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ + remap_pfn_range(vma, vaddr, pfn, size, prot) + +#define MK_IOSPACE_PFN(space, pfn) (pfn) +#define GET_IOSPACE(pfn) 0 +#define GET_PFN(pfn) (pfn) + +/* MMU-specific headers */ + +#ifdef CONFIG_SUN3 +#include <asm/sun3_pgtable.h> +#else +#include <asm/motorola_pgtable.h> +#endif + +#ifndef __ASSEMBLY__ +#include <asm-generic/pgtable.h> + +/* + * Macro to mark a page protection value as "uncacheable". + */ +#ifdef SUN3_PAGE_NOCACHE +# define __SUN3_PAGE_NOCACHE SUN3_PAGE_NOCACHE +#else +# define __SUN3_PAGE_NOCACHE 0 +#endif +#define pgprot_noncached(prot) \ + (MMU_IS_SUN3 \ + ? (__pgprot(pgprot_val(prot) | __SUN3_PAGE_NOCACHE)) \ + : ((MMU_IS_851 || MMU_IS_030) \ + ? (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE030)) \ + : (MMU_IS_040 || MMU_IS_060) \ + ? (__pgprot((pgprot_val(prot) & _CACHEMASK040) | _PAGE_NOCACHE_S)) \ + : (prot))) + +#endif /* !__ASSEMBLY__ */ + +/* + * No page table caches to initialise + */ +#define pgtable_cache_init() do { } while (0) + +#define check_pgt_cache() do { } while (0) + +#endif /* _M68K_PGTABLE_H */ |