| #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) |
| |
| /* Maximum amount of memory we can handle in a domain in pages */ |
| #define MAX_DOMAIN_PAGES \ |
| ((unsigned long)((u64)CONFIG_XEN_MAX_DOMAIN_MEMORY * 1024 * 1024 * 1024 / PAGE_SIZE)) |
| |
| |
| extern unsigned long get_phys_to_machine(unsigned long pfn); |
| extern void set_phys_to_machine(unsigned long pfn, unsigned long mfn); |
| |
| static inline unsigned long pfn_to_mfn(unsigned long pfn) |
| { |
| if (xen_feature(XENFEAT_auto_translated_physmap)) |
| return pfn; |
| |
| return get_phys_to_machine(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 get_phys_to_machine(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) |
| && (get_phys_to_machine(pfn) != mfn)) |
| return max_mapnr; /* force !pfn_valid() */ |
| /* XXX fixme; not true with sparsemem */ |
| return pfn; |
| } |
| |
| /* 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 & PTE_MASK) >> PAGE_SHIFT; |
| } |
| |
| static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) |
| { |
| pte_t pte; |
| |
| pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) | |
| (pgprot_val(pgprot) & __supported_pte_mask); |
| |
| 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 }; |
| } |
| |
| #define pmd_val_ma(v) ((v).pmd) |
| #define pud_val_ma(v) ((v).pgd.pgd) |
| #define __pmd_ma(x) ((pmd_t) { (x) } ) |
| |
| #define pgd_val_ma(x) ((x).pgd) |
| |
| |
| 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 */ |