diff options
Diffstat (limited to 'include/asm-i386/page.h')
| -rw-r--r-- | include/asm-i386/page.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/include/asm-i386/page.h b/include/asm-i386/page.h new file mode 100644 index 000000000..129848b04 --- /dev/null +++ b/include/asm-i386/page.h @@ -0,0 +1,41 @@ +#ifndef _I386_PAGE_H +#define _I386_PAGE_H + +#define invalidate() \ +__asm__ __volatile__("movl %%cr3,%%eax\n\tmovl %%eax,%%cr3": : :"ax") + + /* PAGE_SHIFT determines the page size */ +#define PAGE_SHIFT 12 +#define PGDIR_SHIFT 22 +#define PAGE_SIZE (1UL << PAGE_SHIFT) +#define PGDIR_SIZE (1UL << PGDIR_SHIFT) + +#ifdef __KERNEL__ + + /* number of bits that fit into a memory pointer */ +#define BITS_PER_PTR (8*sizeof(unsigned long)) + /* to mask away the intra-page address bits */ +#define PAGE_MASK (~(PAGE_SIZE-1)) + /* to mask away the intra-page address bits */ +#define PGDIR_MASK (~(PGDIR_SIZE-1)) + /* to align the pointer to the (next) page boundary */ +#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK) + /* 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 + + /* to find an entry in a page-table-directory */ +#define PAGE_DIR_OFFSET(base,address) ((unsigned long*)((base)+\ + ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)*2&PTR_MASK&~PAGE_MASK))) + /* to find an entry in a page-table */ +#define PAGE_PTR(address) \ + ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK) + /* the no. of pointers that fit on a page */ +#define PTRS_PER_PAGE (PAGE_SIZE/sizeof(void*)) + +#endif /* __KERNEL__ */ + +#endif /* _I386_PAGE_H */ |