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| author | Keir Fraser <keir.fraser@citrix.com> | 2008-01-18 16:20:13 +0000 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2008-01-18 16:20:13 +0000 |
| commit | 04383f9c0fe6f18446c8f273d9200fdda4f1afe3 (patch) | |
| tree | 56fd028d8180f14f7fcf62ebb34a096f738a8479 /extras/mini-os/include/x86 | |
| parent | 0747f6e56ec0c2a019f6c76cadb34feca6e0f103 (diff) | |
| download | xen-04383f9c0fe6f18446c8f273d9200fdda4f1afe3.tar.gz xen-04383f9c0fe6f18446c8f273d9200fdda4f1afe3.tar.bz2 xen-04383f9c0fe6f18446c8f273d9200fdda4f1afe3.zip | |
minios: support COW for a zero page
Permits to support sparse data.
Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
Diffstat (limited to 'extras/mini-os/include/x86')
| -rw-r--r-- | extras/mini-os/include/x86/arch_mm.h | 4 | ||||
| -rw-r--r-- | extras/mini-os/include/x86/traps.h | 4 |
2 files changed, 8 insertions, 0 deletions
diff --git a/extras/mini-os/include/x86/arch_mm.h b/extras/mini-os/include/x86/arch_mm.h index 8ae845131a..1ed2755be7 100644 --- a/extras/mini-os/include/x86/arch_mm.h +++ b/extras/mini-os/include/x86/arch_mm.h @@ -144,12 +144,14 @@ typedef unsigned long pgentry_t; #if defined(__i386__) #define L1_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED) +#define L1_PROT_RO (_PAGE_PRESENT|_PAGE_ACCESSED) #define L2_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY |_PAGE_USER) #if defined(CONFIG_X86_PAE) #define L3_PROT (_PAGE_PRESENT) #endif /* CONFIG_X86_PAE */ #elif defined(__x86_64__) #define L1_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_USER) +#define L1_PROT_RO (_PAGE_PRESENT|_PAGE_ACCESSED|_PAGE_USER) #define L2_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY|_PAGE_USER) #define L3_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY|_PAGE_USER) #define L4_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY|_PAGE_USER) @@ -190,6 +192,7 @@ typedef unsigned long maddr_t; extern unsigned long *phys_to_machine_mapping; extern char _text, _etext, _erodata, _edata, _end; +extern unsigned long mfn_zero; #define pfn_to_mfn(_pfn) (phys_to_machine_mapping[(_pfn)]) static __inline__ maddr_t phys_to_machine(paddr_t phys) { @@ -224,5 +227,6 @@ static __inline__ paddr_t machine_to_phys(maddr_t machine) #define pte_to_virt(_pte) to_virt(mfn_to_pfn(pte_to_mfn(_pte)) << PAGE_SHIFT) #define map_frames(f, n) map_frames_ex(f, n, 1, 0, 1, DOMID_SELF, 0, L1_PROT) +#define map_zero(n, a) map_frames_ex(&mfn_zero, n, 0, 0, a, DOMID_SELF, 0, L1_PROT_RO) #endif /* _ARCH_MM_H_ */ diff --git a/extras/mini-os/include/x86/traps.h b/extras/mini-os/include/x86/traps.h index 2f54fd28f0..c3b504b986 100644 --- a/extras/mini-os/include/x86/traps.h +++ b/extras/mini-os/include/x86/traps.h @@ -70,4 +70,8 @@ struct pt_regs { void dump_regs(struct pt_regs *regs); +#define TRAP_PF_PROT 0x1 +#define TRAP_PF_WRITE 0x2 +#define TRAP_PF_USER 0x4 + #endif /* _TRAPS_H_ */ |