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yaml --- r: 93172 b: refs/heads/master c: 20e71f2 h: refs/heads/master v: v3
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Isaku Yamahata
authored and
Ingo Molnar
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Apr 24, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: 642e0c882cd5369429c833d97e4804c8be473e8a | ||
| refs/heads/master: 20e71f2edb5991de8f2a70902b4aa5982f67c69c |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,168 @@ | ||
| #ifndef __XEN_PAGE_H | ||
| #define __XEN_PAGE_H | ||
|
|
||
| #include <linux/pfn.h> | ||
|
|
||
| #include <asm/uaccess.h> | ||
| #include <asm/pgtable.h> | ||
|
|
||
| #include <xen/features.h> | ||
|
|
||
| /* Xen machine address */ | ||
| typedef struct xmaddr { | ||
| phys_addr_t maddr; | ||
| } xmaddr_t; | ||
|
|
||
| /* Xen pseudo-physical address */ | ||
| typedef struct xpaddr { | ||
| phys_addr_t paddr; | ||
| } xpaddr_t; | ||
|
|
||
| #define XMADDR(x) ((xmaddr_t) { .maddr = (x) }) | ||
| #define XPADDR(x) ((xpaddr_t) { .paddr = (x) }) | ||
|
|
||
| /**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/ | ||
| #define INVALID_P2M_ENTRY (~0UL) | ||
| #define FOREIGN_FRAME_BIT (1UL<<31) | ||
| #define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT) | ||
|
|
||
| extern unsigned long *phys_to_machine_mapping; | ||
|
|
||
| static inline unsigned long pfn_to_mfn(unsigned long pfn) | ||
| { | ||
| if (xen_feature(XENFEAT_auto_translated_physmap)) | ||
| return pfn; | ||
|
|
||
| return phys_to_machine_mapping[(unsigned int)(pfn)] & | ||
| ~FOREIGN_FRAME_BIT; | ||
| } | ||
|
|
||
| static inline int phys_to_machine_mapping_valid(unsigned long pfn) | ||
| { | ||
| if (xen_feature(XENFEAT_auto_translated_physmap)) | ||
| return 1; | ||
|
|
||
| return (phys_to_machine_mapping[pfn] != INVALID_P2M_ENTRY); | ||
| } | ||
|
|
||
| static inline unsigned long mfn_to_pfn(unsigned long mfn) | ||
| { | ||
| unsigned long pfn; | ||
|
|
||
| if (xen_feature(XENFEAT_auto_translated_physmap)) | ||
| return mfn; | ||
|
|
||
| #if 0 | ||
| if (unlikely((mfn >> machine_to_phys_order) != 0)) | ||
| return max_mapnr; | ||
| #endif | ||
|
|
||
| pfn = 0; | ||
| /* | ||
| * The array access can fail (e.g., device space beyond end of RAM). | ||
| * In such cases it doesn't matter what we return (we return garbage), | ||
| * but we must handle the fault without crashing! | ||
| */ | ||
| __get_user(pfn, &machine_to_phys_mapping[mfn]); | ||
|
|
||
| return pfn; | ||
| } | ||
|
|
||
| static inline xmaddr_t phys_to_machine(xpaddr_t phys) | ||
| { | ||
| unsigned offset = phys.paddr & ~PAGE_MASK; | ||
| return XMADDR(PFN_PHYS((u64)pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); | ||
| } | ||
|
|
||
| static inline xpaddr_t machine_to_phys(xmaddr_t machine) | ||
| { | ||
| unsigned offset = machine.maddr & ~PAGE_MASK; | ||
| return XPADDR(PFN_PHYS((u64)mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); | ||
| } | ||
|
|
||
| /* | ||
| * We detect special mappings in one of two ways: | ||
| * 1. If the MFN is an I/O page then Xen will set the m2p entry | ||
| * to be outside our maximum possible pseudophys range. | ||
| * 2. If the MFN belongs to a different domain then we will certainly | ||
| * not have MFN in our p2m table. Conversely, if the page is ours, | ||
| * then we'll have p2m(m2p(MFN))==MFN. | ||
| * If we detect a special mapping then it doesn't have a 'struct page'. | ||
| * We force !pfn_valid() by returning an out-of-range pointer. | ||
| * | ||
| * NB. These checks require that, for any MFN that is not in our reservation, | ||
| * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if | ||
| * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN. | ||
| * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety. | ||
| * | ||
| * NB2. When deliberately mapping foreign pages into the p2m table, you *must* | ||
| * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we | ||
| * require. In all the cases we care about, the FOREIGN_FRAME bit is | ||
| * masked (e.g., pfn_to_mfn()) so behaviour there is correct. | ||
| */ | ||
| static inline unsigned long mfn_to_local_pfn(unsigned long mfn) | ||
| { | ||
| extern unsigned long max_mapnr; | ||
| unsigned long pfn = mfn_to_pfn(mfn); | ||
| if ((pfn < max_mapnr) | ||
| && !xen_feature(XENFEAT_auto_translated_physmap) | ||
| && (phys_to_machine_mapping[pfn] != mfn)) | ||
| return max_mapnr; /* force !pfn_valid() */ | ||
| return pfn; | ||
| } | ||
|
|
||
| static inline void set_phys_to_machine(unsigned long pfn, unsigned long mfn) | ||
| { | ||
| if (xen_feature(XENFEAT_auto_translated_physmap)) { | ||
| BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY); | ||
| return; | ||
| } | ||
| phys_to_machine_mapping[pfn] = mfn; | ||
| } | ||
|
|
||
| /* VIRT <-> MACHINE conversion */ | ||
| #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) | ||
| #define virt_to_mfn(v) (pfn_to_mfn(PFN_DOWN(__pa(v)))) | ||
| #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) | ||
|
|
||
| static inline unsigned long pte_mfn(pte_t pte) | ||
| { | ||
| return (pte.pte & ~_PAGE_NX) >> PAGE_SHIFT; | ||
| } | ||
|
|
||
| static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) | ||
| { | ||
| pte_t pte; | ||
|
|
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| pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) | | ||
| (pgprot_val(pgprot) & __supported_pte_mask); | ||
|
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| return pte; | ||
| } | ||
|
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| static inline pteval_t pte_val_ma(pte_t pte) | ||
| { | ||
| return pte.pte; | ||
| } | ||
|
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||
| static inline pte_t __pte_ma(pteval_t x) | ||
| { | ||
| return (pte_t) { .pte = x }; | ||
| } | ||
|
|
||
| #ifdef CONFIG_X86_PAE | ||
| #define pmd_val_ma(v) ((v).pmd) | ||
| #define pud_val_ma(v) ((v).pgd.pgd) | ||
| #define __pmd_ma(x) ((pmd_t) { (x) } ) | ||
| #else /* !X86_PAE */ | ||
| #define pmd_val_ma(v) ((v).pud.pgd.pgd) | ||
| #endif /* CONFIG_X86_PAE */ | ||
|
|
||
| #define pgd_val_ma(x) ((x).pgd) | ||
|
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||
|
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| xmaddr_t arbitrary_virt_to_machine(unsigned long address); | ||
| void make_lowmem_page_readonly(void *vaddr); | ||
| void make_lowmem_page_readwrite(void *vaddr); | ||
|
|
||
| #endif /* __XEN_PAGE_H */ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,168 +1 @@ | ||
| #ifndef __XEN_PAGE_H | ||
| #define __XEN_PAGE_H | ||
|
|
||
| #include <linux/pfn.h> | ||
|
|
||
| #include <asm/uaccess.h> | ||
| #include <asm/pgtable.h> | ||
|
|
||
| #include <xen/features.h> | ||
|
|
||
| /* Xen machine address */ | ||
| typedef struct xmaddr { | ||
| phys_addr_t maddr; | ||
| } xmaddr_t; | ||
|
|
||
| /* Xen pseudo-physical address */ | ||
| typedef struct xpaddr { | ||
| phys_addr_t paddr; | ||
| } xpaddr_t; | ||
|
|
||
| #define XMADDR(x) ((xmaddr_t) { .maddr = (x) }) | ||
| #define XPADDR(x) ((xpaddr_t) { .paddr = (x) }) | ||
|
|
||
| /**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/ | ||
| #define INVALID_P2M_ENTRY (~0UL) | ||
| #define FOREIGN_FRAME_BIT (1UL<<31) | ||
| #define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT) | ||
|
|
||
| extern unsigned long *phys_to_machine_mapping; | ||
|
|
||
| static inline unsigned long pfn_to_mfn(unsigned long pfn) | ||
| { | ||
| if (xen_feature(XENFEAT_auto_translated_physmap)) | ||
| return pfn; | ||
|
|
||
| return phys_to_machine_mapping[(unsigned int)(pfn)] & | ||
| ~FOREIGN_FRAME_BIT; | ||
| } | ||
|
|
||
| static inline int phys_to_machine_mapping_valid(unsigned long pfn) | ||
| { | ||
| if (xen_feature(XENFEAT_auto_translated_physmap)) | ||
| return 1; | ||
|
|
||
| return (phys_to_machine_mapping[pfn] != INVALID_P2M_ENTRY); | ||
| } | ||
|
|
||
| static inline unsigned long mfn_to_pfn(unsigned long mfn) | ||
| { | ||
| unsigned long pfn; | ||
|
|
||
| if (xen_feature(XENFEAT_auto_translated_physmap)) | ||
| return mfn; | ||
|
|
||
| #if 0 | ||
| if (unlikely((mfn >> machine_to_phys_order) != 0)) | ||
| return max_mapnr; | ||
| #endif | ||
|
|
||
| pfn = 0; | ||
| /* | ||
| * The array access can fail (e.g., device space beyond end of RAM). | ||
| * In such cases it doesn't matter what we return (we return garbage), | ||
| * but we must handle the fault without crashing! | ||
| */ | ||
| __get_user(pfn, &machine_to_phys_mapping[mfn]); | ||
|
|
||
| return pfn; | ||
| } | ||
|
|
||
| static inline xmaddr_t phys_to_machine(xpaddr_t phys) | ||
| { | ||
| unsigned offset = phys.paddr & ~PAGE_MASK; | ||
| return XMADDR(PFN_PHYS((u64)pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); | ||
| } | ||
|
|
||
| static inline xpaddr_t machine_to_phys(xmaddr_t machine) | ||
| { | ||
| unsigned offset = machine.maddr & ~PAGE_MASK; | ||
| return XPADDR(PFN_PHYS((u64)mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); | ||
| } | ||
|
|
||
| /* | ||
| * We detect special mappings in one of two ways: | ||
| * 1. If the MFN is an I/O page then Xen will set the m2p entry | ||
| * to be outside our maximum possible pseudophys range. | ||
| * 2. If the MFN belongs to a different domain then we will certainly | ||
| * not have MFN in our p2m table. Conversely, if the page is ours, | ||
| * then we'll have p2m(m2p(MFN))==MFN. | ||
| * If we detect a special mapping then it doesn't have a 'struct page'. | ||
| * We force !pfn_valid() by returning an out-of-range pointer. | ||
| * | ||
| * NB. These checks require that, for any MFN that is not in our reservation, | ||
| * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if | ||
| * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN. | ||
| * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety. | ||
| * | ||
| * NB2. When deliberately mapping foreign pages into the p2m table, you *must* | ||
| * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we | ||
| * require. In all the cases we care about, the FOREIGN_FRAME bit is | ||
| * masked (e.g., pfn_to_mfn()) so behaviour there is correct. | ||
| */ | ||
| static inline unsigned long mfn_to_local_pfn(unsigned long mfn) | ||
| { | ||
| extern unsigned long max_mapnr; | ||
| unsigned long pfn = mfn_to_pfn(mfn); | ||
| if ((pfn < max_mapnr) | ||
| && !xen_feature(XENFEAT_auto_translated_physmap) | ||
| && (phys_to_machine_mapping[pfn] != mfn)) | ||
| return max_mapnr; /* force !pfn_valid() */ | ||
| return pfn; | ||
| } | ||
|
|
||
| static inline void set_phys_to_machine(unsigned long pfn, unsigned long mfn) | ||
| { | ||
| if (xen_feature(XENFEAT_auto_translated_physmap)) { | ||
| BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY); | ||
| return; | ||
| } | ||
| phys_to_machine_mapping[pfn] = mfn; | ||
| } | ||
|
|
||
| /* VIRT <-> MACHINE conversion */ | ||
| #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) | ||
| #define virt_to_mfn(v) (pfn_to_mfn(PFN_DOWN(__pa(v)))) | ||
| #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) | ||
|
|
||
| static inline unsigned long pte_mfn(pte_t pte) | ||
| { | ||
| return (pte.pte & ~_PAGE_NX) >> PAGE_SHIFT; | ||
| } | ||
|
|
||
| static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) | ||
| { | ||
| pte_t pte; | ||
|
|
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| pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) | | ||
| (pgprot_val(pgprot) & __supported_pte_mask); | ||
|
|
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| return pte; | ||
| } | ||
|
|
||
| static inline pteval_t pte_val_ma(pte_t pte) | ||
| { | ||
| return pte.pte; | ||
| } | ||
|
|
||
| static inline pte_t __pte_ma(pteval_t x) | ||
| { | ||
| return (pte_t) { .pte = x }; | ||
| } | ||
|
|
||
| #ifdef CONFIG_X86_PAE | ||
| #define pmd_val_ma(v) ((v).pmd) | ||
| #define pud_val_ma(v) ((v).pgd.pgd) | ||
| #define __pmd_ma(x) ((pmd_t) { (x) } ) | ||
| #else /* !X86_PAE */ | ||
| #define pmd_val_ma(v) ((v).pud.pgd.pgd) | ||
| #endif /* CONFIG_X86_PAE */ | ||
|
|
||
| #define pgd_val_ma(x) ((x).pgd) | ||
|
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||
|
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| xmaddr_t arbitrary_virt_to_machine(unsigned long address); | ||
| void make_lowmem_page_readonly(void *vaddr); | ||
| void make_lowmem_page_readwrite(void *vaddr); | ||
|
|
||
| #endif /* __XEN_PAGE_H */ | ||
| #include <asm/xen/page.h> |