diff options
Diffstat (limited to 'xenolinux-2.4.21-pre4-sparse/include/asm-xeno/pgtable.h')
| -rw-r--r-- | xenolinux-2.4.21-pre4-sparse/include/asm-xeno/pgtable.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/xenolinux-2.4.21-pre4-sparse/include/asm-xeno/pgtable.h b/xenolinux-2.4.21-pre4-sparse/include/asm-xeno/pgtable.h index 3cc0e90ae5..0f914c7c42 100644 --- a/xenolinux-2.4.21-pre4-sparse/include/asm-xeno/pgtable.h +++ b/xenolinux-2.4.21-pre4-sparse/include/asm-xeno/pgtable.h @@ -99,6 +99,7 @@ extern void pgtable_cache_init(void); #ifndef __ASSEMBLY__ /* 4MB is just a nice "safety zone". Also, we align to a fresh pde. */ #define VMALLOC_OFFSET (4*1024*1024) +extern void * high_memory; #define VMALLOC_START (((unsigned long) high_memory + 2*VMALLOC_OFFSET-1) & \ ~(VMALLOC_OFFSET-1)) #define VMALLOC_VMADDR(x) ((unsigned long)(x)) @@ -291,6 +292,71 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) struct page; int change_page_attr(struct page *, int, pgprot_t prot); +static inline void __make_page_readonly(void *va) +{ + pgd_t *pgd = pgd_offset_k((unsigned long)va); + pmd_t *pmd = pmd_offset(pgd, (unsigned long)va); + pte_t *pte = pte_offset(pmd, (unsigned long)va); + queue_l1_entry_update(__pa(pte), (*(unsigned long *)pte)&~_PAGE_RW); +} + +static inline void __make_page_writeable(void *va) +{ + pgd_t *pgd = pgd_offset_k((unsigned long)va); + pmd_t *pmd = pmd_offset(pgd, (unsigned long)va); + pte_t *pte = pte_offset(pmd, (unsigned long)va); + queue_l1_entry_update(__pa(pte), (*(unsigned long *)pte)|_PAGE_RW); +} + +static inline void make_page_readonly(void *va) +{ + pgd_t *pgd = pgd_offset_k((unsigned long)va); + pmd_t *pmd = pmd_offset(pgd, (unsigned long)va); + pte_t *pte = pte_offset(pmd, (unsigned long)va); + queue_l1_entry_update(__pa(pte), (*(unsigned long *)pte)&~_PAGE_RW); + if ( (unsigned long)va >= VMALLOC_START ) + __make_page_readonly(machine_to_virt( + *(unsigned long *)pte&PAGE_MASK)); +} + +static inline void make_page_writeable(void *va) +{ + pgd_t *pgd = pgd_offset_k((unsigned long)va); + pmd_t *pmd = pmd_offset(pgd, (unsigned long)va); + pte_t *pte = pte_offset(pmd, (unsigned long)va); + queue_l1_entry_update(__pa(pte), (*(unsigned long *)pte)|_PAGE_RW); + if ( (unsigned long)va >= VMALLOC_START ) + __make_page_writeable(machine_to_virt( + *(unsigned long *)pte&PAGE_MASK)); +} + +static inline void make_pages_readonly(void *va, unsigned int nr) +{ + while ( nr-- != 0 ) + { + make_page_readonly(va); + va = (void *)((unsigned long)va + PAGE_SIZE); + } +} + +static inline void make_pages_writeable(void *va, unsigned int nr) +{ + while ( nr-- != 0 ) + { + make_page_writeable(va); + va = (void *)((unsigned long)va + PAGE_SIZE); + } +} + +static inline unsigned long arbitrary_virt_to_phys(void *va) +{ + pgd_t *pgd = pgd_offset_k((unsigned long)va); + pmd_t *pmd = pmd_offset(pgd, (unsigned long)va); + pte_t *pte = pte_offset(pmd, (unsigned long)va); + unsigned long pa = (*(unsigned long *)pte) & PAGE_MASK; + return pa | ((unsigned long)va & (PAGE_SIZE-1)); +} + #endif /* !__ASSEMBLY__ */ /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ |