diff options
| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2007-05-02 19:27:15 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 19:27:15 +0200 |
| commit | ce6234b5298902aaec831a67d5f8d9bd2ef5a488 (patch) | |
| tree | 939c22684e11a4f5f17abb89c4898f016e878e21 /include/asm-i386/highmem.h | |
| parent | a27fe809b82c5e18932fcceded28d0d1481ce7bb (diff) | |
[PATCH] i386: PARAVIRT: add kmap_atomic_pte for mapping highpte pages
Xen and VMI both have special requirements when mapping a highmem pte
page into the kernel address space. These can be dealt with by adding
a new kmap_atomic_pte() function for mapping highptes, and hooking it
into the paravirt_ops infrastructure.
Xen specifically wants to map the pte page RO, so this patch exposes a
helper function, kmap_atomic_prot, which maps the page with the
specified page protections.
This also adds a kmap_flush_unused() function to clear out the cached
kmap mappings. Xen needs this to clear out any potential stray RW
mappings of pages which will become part of a pagetable.
[ Zach - vmi.c will need some attention after this patch. It wasn't
immediately obvious to me what needs to be done. ]
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Zachary Amsden <zach@vmware.com>
Diffstat (limited to 'include/asm-i386/highmem.h')
| -rw-r--r-- | include/asm-i386/highmem.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-i386/highmem.h b/include/asm-i386/highmem.h index e9a34ebc25d..13cdcd66fff 100644 --- a/include/asm-i386/highmem.h +++ b/include/asm-i386/highmem.h @@ -24,6 +24,7 @@ #include <linux/threads.h> #include <asm/kmap_types.h> #include <asm/tlbflush.h> +#include <asm/paravirt.h> /* declarations for highmem.c */ extern unsigned long highstart_pfn, highend_pfn; @@ -67,11 +68,16 @@ extern void FASTCALL(kunmap_high(struct page *page)); void *kmap(struct page *page); void kunmap(struct page *page); +void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot); void *kmap_atomic(struct page *page, enum km_type type); void kunmap_atomic(void *kvaddr, enum km_type type); void *kmap_atomic_pfn(unsigned long pfn, enum km_type type); struct page *kmap_atomic_to_page(void *ptr); +#ifndef CONFIG_PARAVIRT +#define kmap_atomic_pte(page, type) kmap_atomic(page, type) +#endif + #define flush_cache_kmaps() do { } while (0) #endif /* __KERNEL__ */ |