diff options
Diffstat (limited to 'include/xen')
| -rw-r--r-- | include/xen/page.h | 169 |
1 files changed, 1 insertions, 168 deletions
diff --git a/include/xen/page.h b/include/xen/page.h index 01799305f02..eaf85fab126 100644 --- a/include/xen/page.h +++ b/include/xen/page.h @@ -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; - - 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 }; -} - -#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) - - -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> |