diff options
Diffstat (limited to 'arch/powerpc/include/asm/highmem.h')
| -rw-r--r-- | arch/powerpc/include/asm/highmem.h | 77 |
1 files changed, 22 insertions, 55 deletions
diff --git a/arch/powerpc/include/asm/highmem.h b/arch/powerpc/include/asm/highmem.h index 5d99b6489d5..caaf6e00630 100644 --- a/arch/powerpc/include/asm/highmem.h +++ b/arch/powerpc/include/asm/highmem.h @@ -22,7 +22,6 @@ #ifdef __KERNEL__ -#include <linux/init.h> #include <linux/interrupt.h> #include <asm/kmap_types.h> #include <asm/tlbflush.h> @@ -38,14 +37,31 @@ extern pte_t *pkmap_page_table; * easily, subsequent pte tables have to be allocated in one physical * chunk of RAM. */ -#define LAST_PKMAP (1 << PTE_SHIFT) -#define LAST_PKMAP_MASK (LAST_PKMAP-1) +/* + * We use one full pte table with 4K pages. And with 16K/64K/256K pages pte + * table covers enough memory (32MB/512MB/2GB resp.), so that both FIXMAP + * and PKMAP can be placed in a single pte table. We use 512 pages for PKMAP + * in case of 16K/64K/256K page sizes. + */ +#ifdef CONFIG_PPC_4K_PAGES +#define PKMAP_ORDER PTE_SHIFT +#else +#define PKMAP_ORDER 9 +#endif +#define LAST_PKMAP (1 << PKMAP_ORDER) +#ifndef CONFIG_PPC_4K_PAGES +#define PKMAP_BASE (FIXADDR_START - PAGE_SIZE*(LAST_PKMAP + 1)) +#else #define PKMAP_BASE ((FIXADDR_START - PAGE_SIZE*(LAST_PKMAP + 1)) & PMD_MASK) +#endif +#define LAST_PKMAP_MASK (LAST_PKMAP-1) #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) extern void *kmap_high(struct page *page); extern void kunmap_high(struct page *page); +extern void *kmap_atomic_prot(struct page *page, pgprot_t prot); +extern void __kunmap_atomic(void *kvaddr); static inline void *kmap(struct page *page) { @@ -63,59 +79,9 @@ static inline void kunmap(struct page *page) kunmap_high(page); } -/* - * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap - * gives a more generic (and caching) interface. But kmap_atomic can - * be used in IRQ contexts, so in some (very limited) cases we need - * it. - */ -static inline void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot) -{ - unsigned int idx; - unsigned long vaddr; - - /* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */ - pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); - - idx = type + KM_TYPE_NR*smp_processor_id(); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(!pte_none(*(kmap_pte-idx))); -#endif - set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot)); - flush_tlb_page(NULL, vaddr); - - return (void*) vaddr; -} - -static inline void *kmap_atomic(struct page *page, enum km_type type) -{ - return kmap_atomic_prot(page, type, kmap_prot); -} - -static inline void kunmap_atomic(void *kvaddr, enum km_type type) +static inline void *kmap_atomic(struct page *page) { -#ifdef CONFIG_DEBUG_HIGHMEM - unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; - enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id(); - - if (vaddr < __fix_to_virt(FIX_KMAP_END)) { - pagefault_enable(); - return; - } - - BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); - - /* - * force other mappings to Oops if they'll try to access - * this pte without first remap it - */ - pte_clear(&init_mm, vaddr, kmap_pte-idx); - flush_tlb_page(NULL, vaddr); -#endif - pagefault_enable(); + return kmap_atomic_prot(page, kmap_prot); } static inline struct page *kmap_atomic_to_page(void *ptr) @@ -131,6 +97,7 @@ static inline struct page *kmap_atomic_to_page(void *ptr) return pte_page(*pte); } + #define flush_cache_kmaps() flush_cache_all() #endif /* __KERNEL__ */ |