X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=include%2Fxen%2Fpage.h;h=eaf85fab12632d45cc00d8976d9108a3eacc2850;hb=18229df5b613ed0732a766fc37850de2e7988e43;hp=c0c8fcb278999ff50b9f92ce141f0e4281f4ab86;hpb=9f5577d8158d8190174d95cbf21713251cc8a044;p=linux-2.6-omap-h63xx.git diff --git a/include/xen/page.h b/include/xen/page.h index c0c8fcb2789..eaf85fab126 100644 --- a/include/xen/page.h +++ b/include/xen/page.h @@ -1,180 +1 @@ -#ifndef __XEN_PAGE_H -#define __XEN_PAGE_H - -#include - -#include -#include - -#include - -#ifdef CONFIG_X86_PAE -/* Xen machine address */ -typedef struct xmaddr { - unsigned long long maddr; -} xmaddr_t; - -/* Xen pseudo-physical address */ -typedef struct xpaddr { - unsigned long long paddr; -} xpaddr_t; -#else -/* Xen machine address */ -typedef struct xmaddr { - unsigned long maddr; -} xmaddr_t; - -/* Xen pseudo-physical address */ -typedef struct xpaddr { - unsigned long paddr; -} xpaddr_t; -#endif - -#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)) - -#ifdef CONFIG_X86_PAE -#define pte_mfn(_pte) (((_pte).pte_low >> PAGE_SHIFT) | \ - (((_pte).pte_high & 0xfff) << (32-PAGE_SHIFT))) - -static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) -{ - pte_t pte; - - pte.pte_high = (page_nr >> (32 - PAGE_SHIFT)) | - (pgprot_val(pgprot) >> 32); - pte.pte_high &= (__supported_pte_mask >> 32); - pte.pte_low = ((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)); - pte.pte_low &= __supported_pte_mask; - - return pte; -} - -static inline unsigned long long pte_val_ma(pte_t x) -{ - return ((unsigned long long)x.pte_high << 32) | x.pte_low; -} -#define pmd_val_ma(v) ((v).pmd) -#define pud_val_ma(v) ((v).pgd.pgd) -#define __pte_ma(x) ((pte_t) { .pte_low = (x), .pte_high = (x)>>32 } ) -#define __pmd_ma(x) ((pmd_t) { (x) } ) -#else /* !X86_PAE */ -#define pte_mfn(_pte) ((_pte).pte_low >> PAGE_SHIFT) -#define mfn_pte(pfn, prot) __pte_ma(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) -#define pte_val_ma(x) ((x).pte_low) -#define pmd_val_ma(v) ((v).pud.pgd.pgd) -#define __pte_ma(x) ((pte_t) { (x) } ) -#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