diff options
| -rw-r--r-- | vm/vm_page.c | 10 | ||||
| -rw-r--r-- | vm/vm_page.h | 16 | ||||
| -rw-r--r-- | vm/vm_resident.c | 6 |
3 files changed, 28 insertions, 4 deletions
diff --git a/vm/vm_page.c b/vm/vm_page.c index ce37c8aa..8e5cab38 100644 --- a/vm/vm_page.c +++ b/vm/vm_page.c @@ -245,10 +245,12 @@ static int vm_page_is_ready __read_mostly; * - HIGHMEM: must be mapped before it can be accessed * * Segments are ordered by priority, 0 being the lowest priority. Their - * relative priorities are DMA < DMA32 < DIRECTMAP < HIGHMEM. Some segments - * may actually be aliases for others, e.g. if DMA is always possible from - * the direct physical mapping, DMA and DMA32 are aliases for DIRECTMAP, - * in which case the segment table contains DIRECTMAP and HIGHMEM only. + * relative priorities are DMA < DMA32 < DIRECTMAP < HIGHMEM or + * DMA < DIRECTMAP < DMA32 < HIGHMEM. + * Some segments may actually be aliases for others, e.g. if DMA is always + * possible from the direct physical mapping, DMA and DMA32 are aliases for + * DIRECTMAP, in which case the segment table contains DIRECTMAP and HIGHMEM + * only. */ static struct vm_page_seg vm_page_segs[VM_PAGE_MAX_SEGS]; diff --git a/vm/vm_page.h b/vm/vm_page.h index b2581d9e..f4761f3f 100644 --- a/vm/vm_page.h +++ b/vm/vm_page.h @@ -162,8 +162,13 @@ void vm_page_check(const struct vm_page *page); */ #define VM_PAGE_DMA 0x01 +#if defined(VM_PAGE_DMA32_LIMIT) && VM_PAGE_DMA32_LIMIT > VM_PAGE_DIRECTMAP_LIMIT +#define VM_PAGE_DIRECTMAP 0x02 +#define VM_PAGE_DMA32 0x04 +#else #define VM_PAGE_DMA32 0x02 #define VM_PAGE_DIRECTMAP 0x04 +#endif #define VM_PAGE_HIGHMEM 0x08 extern @@ -327,13 +332,24 @@ extern unsigned int vm_page_info( * * Selector-to-segment-list translation table : * DMA DMA + * if 32bit PAE + * DIRECTMAP DMA32 DMA + * DMA32 DMA32 DIRECTMAP DMA + * HIGHMEM HIGHMEM DMA32 DIRECTMAP DMA + * else * DMA32 DMA32 DMA * DIRECTMAP DIRECTMAP DMA32 DMA * HIGHMEM HIGHMEM DIRECTMAP DMA32 DMA + * endif */ #define VM_PAGE_SEL_DMA 0 +#if defined(VM_PAGE_DMA32_LIMIT) && VM_PAGE_DMA32_LIMIT > VM_PAGE_DIRECTMAP_LIMIT +#define VM_PAGE_SEL_DIRECTMAP 1 +#define VM_PAGE_SEL_DMA32 2 +#else #define VM_PAGE_SEL_DMA32 1 #define VM_PAGE_SEL_DIRECTMAP 2 +#endif #define VM_PAGE_SEL_HIGHMEM 3 /* diff --git a/vm/vm_resident.c b/vm/vm_resident.c index d4777e70..8fa7c36b 100644 --- a/vm/vm_resident.c +++ b/vm/vm_resident.c @@ -777,10 +777,16 @@ vm_page_t vm_page_grab(unsigned flags) if (flags & VM_PAGE_HIGHMEM) selector = VM_PAGE_SEL_HIGHMEM; +#if defined(VM_PAGE_DMA32_LIMIT) && VM_PAGE_DMA32_LIMIT > VM_PAGE_DIRECTMAP_LIMIT + else if (flags & VM_PAGE_DMA32) + selector = VM_PAGE_SEL_DMA32; +#endif else if (flags & VM_PAGE_DIRECTMAP) selector = VM_PAGE_SEL_DIRECTMAP; +#if defined(VM_PAGE_DMA32_LIMIT) && VM_PAGE_DMA32_LIMIT <= VM_PAGE_DIRECTMAP_LIMIT else if (flags & VM_PAGE_DMA32) selector = VM_PAGE_SEL_DMA32; +#endif else selector = VM_PAGE_SEL_DMA; |