#ifndef __X86_PAGE_H__ #define __X86_PAGE_H__ #include /* * It is important that the masks are signed quantities. This ensures that * the compiler sign-extends a 32-bit mask to 64 bits if that is required. */ #define PAGE_SIZE (_AC(1,L) << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE-1)) #define PAGE_FLAG_MASK (~0) #define PAGE_ORDER_4K 0 #define PAGE_ORDER_2M 9 #define PAGE_ORDER_1G 18 #ifndef __ASSEMBLY__ # include # include #endif #include /* Read a pte atomically from memory. */ #define l1e_read_atomic(l1ep) \ l1e_from_intpte(pte_read_atomic(&l1e_get_intpte(*(l1ep)))) #define l2e_read_atomic(l2ep) \ l2e_from_intpte(pte_read_atomic(&l2e_get_intpte(*(l2ep)))) #define l3e_read_atomic(l3ep) \ l3e_from_intpte(pte_read_atomic(&l3e_get_intpte(*(l3ep)))) #define l4e_read_atomic(l4ep) \ l4e_from_intpte(pte_read_atomic(&l4e_get_intpte(*(l4ep)))) /* Write a pte atomically to memory. */ #define l1e_write_atomic(l1ep, l1e) \ pte_write_atomic(&l1e_get_intpte(*(l1ep)), l1e_get_intpte(l1e)) #define l2e_write_atomic(l2ep, l2e) \ pte_write_atomic(&l2e_get_intpte(*(l2ep)), l2e_get_intpte(l2e)) #define l3e_write_atomic(l3ep, l3e) \ pte_write_atomic(&l3e_get_intpte(*(l3ep)), l3e_get_intpte(l3e)) #define l4e_write_atomic(l4ep, l4e) \ pte_write_atomic(&l4e_get_intpte(*(l4ep)), l4e_get_intpte(l4e)) /* * Write a pte safely but non-atomically to memory. * The PTE may become temporarily not-present during the update. */ #define l1e_write(l1ep, l1e) \ pte_write(&l1e_get_intpte(*(l1ep)), l1e_get_intpte(l1e)) #define l2e_write(l2ep, l2e) \ pte_write(&l2e_get_intpte(*(l2ep)), l2e_get_intpte(l2e)) #define l3e_write(l3ep, l3e) \ pte_write(&l3e_get_intpte(*(l3ep)), l3e_get_intpte(l3e)) #define l4e_write(l4ep, l4e) \ pte_write(&l4e_get_intpte(*(l4ep)), l4e_get_intpte(l4e)) /* Get direct integer representation of a pte's contents (intpte_t). */ #define l1e_get_intpte(x) ((x).l1) #define l2e_get_intpte(x) ((x).l2) #define l3e_get_intpte(x) ((x).l3) #define l4e_get_intpte(x) ((x).l4) /* Get pfn mapped by pte (unsigned long). */ #define l1e_get_pfn(x) \ ((unsigned long)(((x).l1 & (PADDR_MASK&PAGE_MASK)) >> PAGE_SHIFT)) #define l2e_get_pfn(x) \ ((unsigned long)(((x).l2 & (PADDR_MASK&PAGE_MASK)) >> PAGE_SHIFT)) #define l3e_get_pfn(x) \ ((unsigned long)(((x).l3 & (PADDR_MASK&PAGE_MASK)) >> PAGE_SHIFT)) #define l4e_get_pfn(x) \ ((unsigned long)(((x).l4 & (PADDR_MASK&PAGE_MASK)) >> PAGE_SHIFT)) /* Get physical address of page mapped by pte (paddr_t). */ #define l1e_get_paddr(x) \ ((paddr_t)(((x).l1 & (PADDR_MASK&PAGE_MASK)))) #define l2e_get_paddr(x) \ ((paddr_t)(((x).l2 & (PADDR_MASK&PAGE_MASK)))) #define l3e_get_paddr(x) \ ((paddr_t)(((x).l3 & (PADDR_MASK&PAGE_MASK)))) #define l4e_get_paddr(x) \ ((paddr_t)(((x).l4 & (PADDR_MASK&PAGE_MASK)))) /* Get pointer to info structure of page mapped by pte (struct page_info *). */ #define l1e_get_page(x) (mfn_to_page(l1e_get_pfn(x))) #define l2e_get_page(x) (mfn_to_page(l2e_get_pfn(x))) #define l3e_get_page(x) (mfn_to_page(l3e_get_pfn(x))) #define l4e_get_page(x) (mfn_to_page(l4e_get_pfn(x))) /* Get pte access flags (unsigned int). */ #define l1e_get_flags(x) (get_pte_flags((x).l1)) #define l2e_get_flags(x) (get_pte_flags((x).l2)) #define l3e_get_flags(x) (get_pte_flags((x).l3)) #define l4e_get_flags(x) (get_pte_flags((x).l4)) /* Construct an empty pte. */ #define l1e_empty() ((l1_pgentry_t) { 0 }) #define l2e_empty() ((l2_pgentry_t) { 0 }) #define l3e_empty() ((l3_pgentry_t) { 0 }) #define l4e_empty() ((l4_pgentry_t) { 0 }) /* Construct a pte from a pfn and access flags. */ #define l1e_from_pfn(pfn, flags) \ ((l1_pgentry_t) { ((intpte_t)(pfn) << PAGE_SHIFT) | put_pte_flags(flags) }) #define l2e_from_pfn(pfn, flags) \ ((l2_pgentry_t) { ((intpte_t)(pfn) << PAGE_SHIFT) | put_pte_flags(flags) }) #define l3e_from_pfn(pfn, flags) \ ((l3_pgentry_t) { ((intpte_t)(pfn) << PAGE_SHIFT) | put_pte_flags(flags) }) #define l4e_from_pfn(pfn, flags) \ ((l4_pgentry_t) { ((intpte_t)(pfn) << PAGE_SHIFT) | put_pte_flags(flags) }) /* Construct a pte from a physical address and access flags. */ #ifndef __ASSEMBLY__ static inline l1_pgentry_t l1e_from_paddr(paddr_t pa, unsigned int flags) { ASSERT((pa & ~(PADDR_MASK & PAGE_MASK)) == 0); return (l1_pgentry_t) { pa | put_pte_flags(flags) }; } static inline l2_pgentry_t l2e_from_paddr(paddr_t pa, unsigned int flags) { ASSERT((pa & ~(PADDR_MASK & PAGE_MASK)) == 0); return (l2_pgentry_t) { pa | put_pte_flags(flags) }; } static inline l3_pgentry_t l3e_from_paddr(paddr_t pa, unsigned int flags) { ASSERT((pa & ~(PADDR_MASK & PAGE_MASK)) == 0); return (l3_pgentry_t) { pa | put_pte_flags(flags) }; } static inline l4_pgentry_t l4e_from_paddr(paddr_t pa, unsigned int flags) { ASSERT((pa & ~(PADDR_MASK & PAGE_MASK)) == 0); return (l4_pgentry_t) { pa | put_pte_flags(flags) }; } #endif /* !__ASSEMBLY__ */ /* Construct a pte from its direct integer representation. */ #define l1e_from_intpte(intpte) ((l1_pgentry_t) { (intpte_t)(intpte) }) #define l2e_from_intpte(intpte) ((l2_pgentry_t) { (intpte_t)(intpte) }) #define l3e_from_intpte(intpte) ((l3_pgentry_t) { (intpte_t)(intpte) }) #define l4e_from_intpte(intpte) ((l4_pgentry_t) { (intpte_t)(intpte) }) /* Construct a pte from a page pointer and access flags. */ #define l1e_from_page(page, flags) (l1e_from_pfn(page_to_mfn(page),(flags))) #define l2e_from_page(page, flags) (l2e_from_pfn(page_to_mfn(page),(flags))) #define l3e_from_page(page, flags) (l3e_from_pfn(page_to_mfn(page),(flags))) #define l4e_from_page(page, flags) (l4e_from_pfn(page_to_mfn(page),(flags))) /* Add extra flags to an existing pte. */ #define l1e_add_flags(x, flags) ((x).l1 |= put_pte_flags(flags)) #define l2e_add_flags(x, flags) ((x).l2 |= put_pte_flags(flags)) #define l3e_add_flags(x, flags) ((x).l3 |= put_pte_flags(flags)) #define l4e_add_flags(x, flags) ((x).l4 |= put_pte_flags(flags)) /* Remove flags from an existing pte. */ #define l1e_remove_flags(x, flags) ((x).l1 &= ~put_pte_flags(flags)) #define l2e_remove_flags(x, flags) ((x).l2 &= ~put_pte_flags(flags)) #define l3e_remove_flags(x, flags) ((x).l3 &= ~put_pte_flags(flags)) #define l4e_remove_flags(x, flags) ((x).l4 &= ~put_pte_flags(flags)) /* Check if a pte's page mapping or significant access flags have changed. */ #define l1e_has_changed(x,y,flags) \ ( !!(((x).l1 ^ (y).l1) & ((PADDR_MASK&PAGE_MASK)|put_pte_flags(flags))) ) #define l2e_has_changed(x,y,flags) \ ( !!(((x).l2 ^ (y).l2) & ((PADDR_MASK&PAGE_MASK)|put_pte_flags(flags))) ) #define l3e_has_changed(x,y,flags) \ ( !!(((x).l3 ^ (y).l3) & ((PADDR_MASK&PAGE_MASK)|put_pte_flags(flags))) ) #define l4e_has_changed(x,y,flags) \ ( !!(((x).l4 ^ (y).l4) & ((PADDR_MASK&PAGE_MASK)|put_pte_flags(flags))) ) /* Pagetable walking. */ #define l2e_to_l1e(x) ((l1_pgentry_t *)__va(l2e_get_paddr(x))) #define l3e_to_l2e(x) ((l2_pgentry_t *)__va(l3e_get_paddr(x))) #define l4e_to_l3e(x) ((l3_pgentry_t *)__va(l4e_get_paddr(x))) #define map_l1t_from_l2e(x) ((l1_pgentry_t *)map_domain_page(l2e_get_pfn(x))) #define map_l2t_from_l3e(x) ((l2_pgentry_t *)map_domain_page(l3e_get_pfn(x))) #define map_l3t_from_l4e(x) ((l3_pgentry_t *)map_domain_page(l4e_get_pfn(x))) /* Given a virtual address, get an entry offset into a page table. */ #define l1_table_offset(a) \ (((a) >> L1_PAGETABLE_SHIFT) & (L1_PAGETABLE_ENTRIES - 1)) #define l2_table_offset(a) \ (((a) >> L2_PAGETABLE_SHIFT) & (L2_PAGETABLE_ENTRIES - 1)) #define l3_table_offset(a) \ (((a) >> L3_PAGETABLE_SHIFT) & (L3_PAGETABLE_ENTRIES - 1)) #define l4_table_offset(a) \ (((a) >> L4_PAGETABLE_SHIFT) & (L4_PAGETABLE_ENTRIES - 1)) /* Convert a pointer to a page-table entry into pagetable slot index. */ #define pgentry_ptr_to_slot(_p) \ (((unsigned long)(_p) & ~PAGE_MASK) / sizeof(*(_p))) #ifndef __ASSEMBLY__ /* Page-table type. */ typedef struct { u64 pfn; } pagetable_t; #define pagetable_get_paddr(x) ((paddr_t)(x).pfn << PAGE_SHIFT) #define pagetable_get_page(x) mfn_to_page((x).pfn) #define pagetable_get_pfn(x) ((x).pfn) #define pagetable_get_mfn(x) _mfn(((x).pfn)) #define pagetable_is_null(x) ((x).pfn == 0) #define pagetable_from_pfn(pfn) ((pagetable_t) { (pfn) }) #define pagetable_from_mfn(mfn) ((pagetable_t) { mfn_x(mfn) }) #define pagetable_from_page(pg) pagetable_from_pfn(page_to_mfn(pg)) #define pagetable_from_paddr(p) pagetable_from_pfn((p)>>PAGE_SHIFT) #define pagetable_null() pagetable_from_pfn(0) void clear_page_sse2(void *); #define clear_page(_p) (cpu_has_xmm2 ? \ clear_page_sse2((void *)(_p)) : \ (void)memset((void *)(_p), 0, PAGE_SIZE)) void copy_page_sse2(void *, const void *); #define copy_page(_t,_f) (cpu_has_xmm2 ? \ copy_page_sse2(_t, _f) : \ (void)memcpy(_t, _f, PAGE_SIZE)) /* Convert between Xen-heap virtual addresses and machine addresses. */ #define __pa(x) (virt_to_maddr(x)) #define __va(x) (maddr_to_virt(x)) /* Convert between Xen-heap virtual addresses and machine frame numbers. */ #define __virt_to_mfn(va) (virt_to_maddr(va) >> PAGE_SHIFT) #define __mfn_to_virt(mfn) (maddr_to_virt((paddr_t)(mfn) << PAGE_SHIFT)) /* Convert between machine frame numbers and page-info structures. */ #define __mfn_to_page(mfn) (frame_table + pfn_to_pdx(mfn)) #define __page_to_mfn(pg) pdx_to_pfn((unsigned long)((pg) - frame_table)) /* Convert between machine addresses and page-info structures. */ #define __maddr_to_page(ma) __mfn_to_page((ma) >> PAGE_SHIFT) #define __page_to_maddr(pg) ((paddr_t)__page_to_mfn(pg) << PAGE_SHIFT) /* Convert between frame number and address formats. */ #define __pfn_to_paddr(pfn) ((paddr_t)(pfn) << PAGE_SHIFT) #define __paddr_to_pfn(pa) ((unsigned long)((pa) >> PAGE_SHIFT)) /* Convert between machine frame numbers and spage-info structures. */ #define __mfn_to_spage(mfn) (spage_table + pfn_to_sdx(mfn)) #define __spage_to_mfn(pg) sdx_to_pfn((unsigned long)((pg) - spage_table)) /* Convert between page-info structures and spage-info structures. */ #define page_to_spage(page) (spage_table+(((page)-frame_table)>>(SUPERPAGE_SHIFT-PAGE_SHIFT))) #define spage_to_page(spage) (frame_table+(((spage)-spage_table)<<(SUPERPAGE_SHIFT-PAGE_SHIFT))) /* * We define non-underscored wrappers for above conversion functions. These are * overridden in various source files while underscored versions remain intact. */ #define mfn_valid(mfn) __mfn_valid(mfn) #define virt_to_mfn(va) __virt_to_mfn(va) #define mfn_to_virt(mfn) __mfn_to_virt(mfn) #define virt_to_maddr(va) __virt_to_maddr((unsigned long)(va)) #define maddr_to_virt(ma) __maddr_to_virt((unsigned long)(ma)) #define mfn_to_page(mfn) __mfn_to_page(mfn) #define page_to_mfn(pg) __page_to_mfn(pg) #define mfn_to_spage(mfn) __mfn_to_spage(mfn) #define spage_to_mfn(pg) __spage_to_mfn(pg) #define maddr_to_page(ma) __maddr_to_page(ma) #define page_to_maddr(pg) __page_to_maddr(pg) #define virt_to_page(va) __virt_to_page(va) #define page_to_virt(pg) __page_to_virt(pg) #define pfn_to_paddr(pfn) __pfn_to_paddr(pfn) #define paddr_to_pfn(pa) __paddr_to_pfn(pa) #define paddr_to_pdx(pa) pfn_to_pdx(paddr_to_pfn(pa)) #endif /* !defined(__ASSEMBLY__) */ /* Where to find each level of the linear mapping */ #define __linear_l1_table ((l1_pgentry_t *)(LINEAR_PT_VIRT_START)) #define __linear_l2_table \ ((l2_pgentry_t *)(__linear_l1_table + l1_linear_offset(LINEAR_PT_VIRT_START))) #define __linear_l3_table \ ((l3_pgentry_t *)(__linear_l2_table + l2_linear_offset(LINEAR_PT_VIRT_START))) #define __linear_l4_table \ ((l4_pgentry_t *)(__linear_l3_table + l3_linear_offset(LINEAR_PT_VIRT_START))) #ifndef __ASSEMBLY__ extern root_pgentry_t idle_pg_table[ROOT_PAGETABLE_ENTRIES]; extern l2_pgentry_t *compat_idle_pg_table_l2; extern unsigned int m2p_compat_vstart; extern l2_pgentry_t l2_xenmap[L2_PAGETABLE_ENTRIES], l2_bootmap[L2_PAGETABLE_ENTRIES]; extern l3_pgentry_t l3_bootmap[L3_PAGETABLE_ENTRIES]; extern l2_pgentry_t l2_identmap[4*L2_PAGETABLE_ENTRIES]; extern l1_pgentry_t l1_identmap[L1_PAGETABLE_ENTRIES], l1_fixmap[L1_PAGETABLE_ENTRIES]; void paging_init(void); #endif /* !defined(__ASSEMBLY__) */ #define _PAGE_NONE _AC(0x000,U) #define _PAGE_PRESENT _AC(0x001,U) #define _PAGE_RW _AC(0x002,U) #define _PAGE_USER _AC(0x004,U) #define _PAGE_PWT _AC(0x008,U) #define _PAGE_PCD _AC(0x010,U) #define _PAGE_ACCESSED _AC(0x020,U) #define _PAGE_DIRTY _AC(0x040,U) #define _PAGE_PAT _AC(0x080,U) #define _PAGE_PSE _AC(0x080,U) #define _PAGE_GLOBAL _AC(0x100,U) #define _PAGE_AVAIL0 _AC(0x200,U) #define _PAGE_AVAIL1 _AC(0x400,U) #define _PAGE_AVAIL2 _AC(0x800,U) #define _PAGE_AVAIL _AC(0xE00,U) #define _PAGE_PSE_PAT _AC(0x1000,U) /* non-architectural flags */ #define _PAGE_PAGED 0x2000U #define _PAGE_SHARED 0x4000U /* * Debug option: Ensure that granted mappings are not implicitly unmapped. * WARNING: This will need to be disabled to run OSes that use the spare PTE * bits themselves (e.g., *BSD). */ #ifdef NDEBUG #undef _PAGE_GNTTAB #endif #ifndef _PAGE_GNTTAB #define _PAGE_GNTTAB 0 #endif #define __PAGE_HYPERVISOR \ (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) #define __PAGE_HYPERVISOR_NOCACHE \ (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_PCD | _PAGE_ACCESSED) #define MAP_SMALL_PAGES _PAGE_AVAIL0 /* don't use superpages mappings */ #ifndef __ASSEMBLY__ /* Allocator functions for Xen pagetables. */ void *alloc_xen_pagetable(void); void free_xen_pagetable(void *v); l1_pgentry_t *virt_to_xen_l1e(unsigned long v); extern void set_pdx_range(unsigned long smfn, unsigned long emfn); /* Convert between PAT/PCD/PWT embedded in PTE flags and 3-bit cacheattr. */ static inline uint32_t pte_flags_to_cacheattr(uint32_t flags) { return ((flags >> 5) & 4) | ((flags >> 3) & 3); } static inline uint32_t cacheattr_to_pte_flags(uint32_t cacheattr) { return ((cacheattr & 4) << 5) | ((cacheattr & 3) << 3); } /* return true if permission increased */ static inline bool_t perms_strictly_increased(uint32_t old_flags, uint32_t new_flags) /* Given the flags of two entries, are the new flags a strict * increase in rights over the old ones? */ { uint32_t of = old_flags & (_PAGE_PRESENT|_PAGE_RW|_PAGE_USER|_PAGE_NX_BIT); uint32_t nf = new_flags & (_PAGE_PRESENT|_PAGE_RW|_PAGE_USER|_PAGE_NX_BIT); /* Flip the NX bit, since it's the only one that decreases rights; * we calculate as if it were an "X" bit. */ of ^= _PAGE_NX_BIT; nf ^= _PAGE_NX_BIT; /* If the changed bits are all set in the new flags, then rights strictly * increased between old and new. */ return ((of | (of ^ nf)) == nf); } #endif /* !__ASSEMBLY__ */ #define PAGE_ALIGN(x) (((x) + PAGE_SIZE - 1) & PAGE_MASK) #endif /* __X86_PAGE_H__ */ /* * Local variables: * mode: C * c-file-style: "BSD" * c-basic-offset: 4 * tab-width: 4 * indent-tabs-mode: nil * End: */