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author | Ingo Molnar <mingo@elte.hu> | 2008-07-18 21:13:20 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-07-18 21:13:20 +0200 |
commit | f6dc8ccaab6d8f63cbae1e6c73fe972b26f5376c (patch) | |
tree | c5643fcdc884a8d0bfc3f1bc28039cab7394e5bc /include/asm-ppc/highmem.h | |
parent | 323ec001c6bb98eeabb5abbdbb8c8055d9496554 (diff) | |
parent | 5b664cb235e97afbf34db9c4d77f08ebd725335e (diff) | |
download | op-kernel-dev-f6dc8ccaab6d8f63cbae1e6c73fe972b26f5376c.zip op-kernel-dev-f6dc8ccaab6d8f63cbae1e6c73fe972b26f5376c.tar.gz |
Merge branch 'linus' into core/generic-dma-coherent
Conflicts:
kernel/Makefile
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-ppc/highmem.h')
-rw-r--r-- | include/asm-ppc/highmem.h | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/include/asm-ppc/highmem.h b/include/asm-ppc/highmem.h deleted file mode 100644 index f7b21ee..0000000 --- a/include/asm-ppc/highmem.h +++ /dev/null @@ -1,135 +0,0 @@ -/* - * highmem.h: virtual kernel memory mappings for high memory - * - * PowerPC version, stolen from the i386 version. - * - * Used in CONFIG_HIGHMEM systems for memory pages which - * are not addressable by direct kernel virtual addresses. - * - * Copyright (C) 1999 Gerhard Wichert, Siemens AG - * Gerhard.Wichert@pdb.siemens.de - * - * - * Redesigned the x86 32-bit VM architecture to deal with - * up to 16 Terrabyte physical memory. With current x86 CPUs - * we now support up to 64 Gigabytes physical RAM. - * - * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com> - */ - -#ifndef _ASM_HIGHMEM_H -#define _ASM_HIGHMEM_H - -#ifdef __KERNEL__ - -#include <linux/init.h> -#include <linux/interrupt.h> -#include <asm/kmap_types.h> -#include <asm/tlbflush.h> -#include <asm/page.h> - -/* undef for production */ -#define HIGHMEM_DEBUG 1 - -extern pte_t *kmap_pte; -extern pgprot_t kmap_prot; -extern pte_t *pkmap_page_table; - -/* - * Right now we initialize only a single pte table. It can be extended - * easily, subsequent pte tables have to be allocated in one physical - * chunk of RAM. - */ -#define PKMAP_BASE CONFIG_HIGHMEM_START -#define LAST_PKMAP (1 << PTE_SHIFT) -#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)) - -#define KMAP_FIX_BEGIN (PKMAP_BASE + 0x00400000UL) - -extern void *kmap_high(struct page *page); -extern void kunmap_high(struct page *page); - -static inline void *kmap(struct page *page) -{ - might_sleep(); - if (!PageHighMem(page)) - return page_address(page); - return kmap_high(page); -} - -static inline void kunmap(struct page *page) -{ - BUG_ON(in_interrupt()); - if (!PageHighMem(page)) - return; - 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(struct page *page, enum km_type type) -{ - 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 = KMAP_FIX_BEGIN + idx * PAGE_SIZE; -#ifdef HIGHMEM_DEBUG - BUG_ON(!pte_none(*(kmap_pte+idx))); -#endif - set_pte_at(&init_mm, vaddr, kmap_pte+idx, mk_pte(page, kmap_prot)); - flush_tlb_page(NULL, vaddr); - - return (void*) vaddr; -} - -static inline void kunmap_atomic(void *kvaddr, enum km_type type) -{ -#ifdef HIGHMEM_DEBUG - unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; - unsigned int idx = type + KM_TYPE_NR*smp_processor_id(); - - if (vaddr < KMAP_FIX_BEGIN) { // FIXME - pagefault_enable(); - return; - } - - BUG_ON(vaddr != KMAP_FIX_BEGIN + idx * PAGE_SIZE); - - /* - * 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(); -} - -static inline struct page *kmap_atomic_to_page(void *ptr) -{ - unsigned long idx, vaddr = (unsigned long) ptr; - - if (vaddr < KMAP_FIX_BEGIN) - return virt_to_page(ptr); - - idx = (vaddr - KMAP_FIX_BEGIN) >> PAGE_SHIFT; - return pte_page(kmap_pte[idx]); -} - -#define flush_cache_kmaps() flush_cache_all() - -#endif /* __KERNEL__ */ - -#endif /* _ASM_HIGHMEM_H */ |