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be43d72835
Use one of the software-defined PTE bits to indicate that a mapping is intended for an IO address. On native hardware this is irrelevent, since a physical address is a physical address. But in a virtual environment, physical addresses are also virtualized, so there needs to be some way to distinguish between pseudo-physical addresses and actual hardware addresses; _PAGE_IOMAP indicates this intent. By default, __supported_pte_mask masks out _PAGE_IOMAP, so it doesn't even appear in the final pagetable. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
556 lines
17 KiB
C
556 lines
17 KiB
C
#ifndef ASM_X86__PGTABLE_H
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#define ASM_X86__PGTABLE_H
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#define FIRST_USER_ADDRESS 0
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#define _PAGE_BIT_PRESENT 0 /* is present */
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#define _PAGE_BIT_RW 1 /* writeable */
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#define _PAGE_BIT_USER 2 /* userspace addressable */
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#define _PAGE_BIT_PWT 3 /* page write through */
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#define _PAGE_BIT_PCD 4 /* page cache disabled */
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#define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */
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#define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
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#define _PAGE_BIT_FILE 6
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#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
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#define _PAGE_BIT_PAT 7 /* on 4KB pages */
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#define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
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#define _PAGE_BIT_UNUSED1 9 /* available for programmer */
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#define _PAGE_BIT_IOMAP 10 /* flag used to indicate IO mapping */
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#define _PAGE_BIT_UNUSED3 11
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#define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
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#define _PAGE_BIT_SPECIAL _PAGE_BIT_UNUSED1
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#define _PAGE_BIT_CPA_TEST _PAGE_BIT_UNUSED1
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#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
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#define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
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#define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW)
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#define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER)
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#define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
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#define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
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#define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
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#define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
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#define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
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#define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
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#define _PAGE_UNUSED1 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
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#define _PAGE_IOMAP (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
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#define _PAGE_UNUSED3 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3)
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#define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
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#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
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#define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
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#define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
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#define __HAVE_ARCH_PTE_SPECIAL
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#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
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#define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
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#else
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#define _PAGE_NX (_AT(pteval_t, 0))
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#endif
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/* If _PAGE_PRESENT is clear, we use these: */
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#define _PAGE_FILE _PAGE_DIRTY /* nonlinear file mapping,
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* saved PTE; unset:swap */
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#define _PAGE_PROTNONE _PAGE_PSE /* if the user mapped it with PROT_NONE;
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pte_present gives true */
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#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
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_PAGE_ACCESSED | _PAGE_DIRTY)
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#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \
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_PAGE_DIRTY)
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/* Set of bits not changed in pte_modify */
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#define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
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_PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
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#define _PAGE_CACHE_WB (0)
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#define _PAGE_CACHE_WC (_PAGE_PWT)
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#define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
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#define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
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#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
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#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
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_PAGE_ACCESSED | _PAGE_NX)
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#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \
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_PAGE_USER | _PAGE_ACCESSED)
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#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
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_PAGE_ACCESSED | _PAGE_NX)
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#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
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_PAGE_ACCESSED)
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#define PAGE_COPY PAGE_COPY_NOEXEC
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#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
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_PAGE_ACCESSED | _PAGE_NX)
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#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
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_PAGE_ACCESSED)
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#define __PAGE_KERNEL_EXEC \
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(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
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#define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
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#define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
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#define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
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#define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
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#define __PAGE_KERNEL_WC (__PAGE_KERNEL | _PAGE_CACHE_WC)
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#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
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#define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD)
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#define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
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#define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
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#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
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#define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
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#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
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#define __PAGE_KERNEL_IO (__PAGE_KERNEL | _PAGE_IOMAP)
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#define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
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#define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
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#define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC | _PAGE_IOMAP)
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#define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
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#define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
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#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
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#define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
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#define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC)
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#define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
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#define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS)
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#define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
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#define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
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#define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
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#define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
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#define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
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#define PAGE_KERNEL_VSYSCALL_NOCACHE __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
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#define PAGE_KERNEL_IO __pgprot(__PAGE_KERNEL_IO)
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#define PAGE_KERNEL_IO_NOCACHE __pgprot(__PAGE_KERNEL_IO_NOCACHE)
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#define PAGE_KERNEL_IO_UC_MINUS __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
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#define PAGE_KERNEL_IO_WC __pgprot(__PAGE_KERNEL_IO_WC)
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/* xwr */
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#define __P000 PAGE_NONE
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#define __P001 PAGE_READONLY
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#define __P010 PAGE_COPY
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#define __P011 PAGE_COPY
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#define __P100 PAGE_READONLY_EXEC
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#define __P101 PAGE_READONLY_EXEC
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#define __P110 PAGE_COPY_EXEC
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#define __P111 PAGE_COPY_EXEC
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#define __S000 PAGE_NONE
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#define __S001 PAGE_READONLY
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#define __S010 PAGE_SHARED
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#define __S011 PAGE_SHARED
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#define __S100 PAGE_READONLY_EXEC
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#define __S101 PAGE_READONLY_EXEC
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#define __S110 PAGE_SHARED_EXEC
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#define __S111 PAGE_SHARED_EXEC
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/*
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* early identity mapping pte attrib macros.
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*/
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#ifdef CONFIG_X86_64
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#define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
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#else
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#define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
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#define PDE_IDENT_ATTR 0x063 /* PRESENT+RW+DIRTY+ACCESSED */
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#define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
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#endif
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#ifndef __ASSEMBLY__
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/*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
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#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
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extern spinlock_t pgd_lock;
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extern struct list_head pgd_list;
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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*/
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static inline int pte_dirty(pte_t pte)
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{
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return pte_flags(pte) & _PAGE_DIRTY;
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}
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static inline int pte_young(pte_t pte)
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{
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return pte_flags(pte) & _PAGE_ACCESSED;
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}
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static inline int pte_write(pte_t pte)
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{
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return pte_flags(pte) & _PAGE_RW;
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}
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static inline int pte_file(pte_t pte)
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{
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return pte_flags(pte) & _PAGE_FILE;
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}
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static inline int pte_huge(pte_t pte)
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{
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return pte_flags(pte) & _PAGE_PSE;
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}
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static inline int pte_global(pte_t pte)
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{
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return pte_flags(pte) & _PAGE_GLOBAL;
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}
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static inline int pte_exec(pte_t pte)
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{
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return !(pte_flags(pte) & _PAGE_NX);
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}
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static inline int pte_special(pte_t pte)
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{
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return pte_val(pte) & _PAGE_SPECIAL;
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}
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static inline unsigned long pte_pfn(pte_t pte)
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{
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return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
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}
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#define pte_page(pte) pfn_to_page(pte_pfn(pte))
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static inline int pmd_large(pmd_t pte)
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{
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return (pmd_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
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(_PAGE_PSE | _PAGE_PRESENT);
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}
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static inline pte_t pte_mkclean(pte_t pte)
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{
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return __pte(pte_val(pte) & ~_PAGE_DIRTY);
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}
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static inline pte_t pte_mkold(pte_t pte)
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{
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return __pte(pte_val(pte) & ~_PAGE_ACCESSED);
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}
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static inline pte_t pte_wrprotect(pte_t pte)
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{
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return __pte(pte_val(pte) & ~_PAGE_RW);
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}
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static inline pte_t pte_mkexec(pte_t pte)
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{
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return __pte(pte_val(pte) & ~_PAGE_NX);
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}
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static inline pte_t pte_mkdirty(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_DIRTY);
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}
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static inline pte_t pte_mkyoung(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_ACCESSED);
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}
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static inline pte_t pte_mkwrite(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_RW);
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}
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static inline pte_t pte_mkhuge(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_PSE);
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}
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static inline pte_t pte_clrhuge(pte_t pte)
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{
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return __pte(pte_val(pte) & ~_PAGE_PSE);
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}
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static inline pte_t pte_mkglobal(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_GLOBAL);
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}
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static inline pte_t pte_clrglobal(pte_t pte)
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{
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return __pte(pte_val(pte) & ~_PAGE_GLOBAL);
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}
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static inline pte_t pte_mkspecial(pte_t pte)
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{
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return __pte(pte_val(pte) | _PAGE_SPECIAL);
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}
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extern pteval_t __supported_pte_mask;
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static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
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{
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return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
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pgprot_val(pgprot)) & __supported_pte_mask);
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}
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static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
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{
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return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
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pgprot_val(pgprot)) & __supported_pte_mask);
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}
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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pteval_t val = pte_val(pte);
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/*
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* Chop off the NX bit (if present), and add the NX portion of
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* the newprot (if present):
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*/
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val &= _PAGE_CHG_MASK;
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val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;
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return __pte(val);
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}
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/* mprotect needs to preserve PAT bits when updating vm_page_prot */
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#define pgprot_modify pgprot_modify
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static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
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{
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pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
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pgprotval_t addbits = pgprot_val(newprot);
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return __pgprot(preservebits | addbits);
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}
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#define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
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#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
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#ifndef __ASSEMBLY__
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#define __HAVE_PHYS_MEM_ACCESS_PROT
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struct file;
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pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
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unsigned long size, pgprot_t vma_prot);
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int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
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unsigned long size, pgprot_t *vma_prot);
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#endif
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/* Install a pte for a particular vaddr in kernel space. */
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void set_pte_vaddr(unsigned long vaddr, pte_t pte);
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#ifdef CONFIG_X86_32
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extern void native_pagetable_setup_start(pgd_t *base);
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extern void native_pagetable_setup_done(pgd_t *base);
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#else
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static inline void native_pagetable_setup_start(pgd_t *base) {}
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static inline void native_pagetable_setup_done(pgd_t *base) {}
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#endif
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extern int arch_report_meminfo(char *page);
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#ifdef CONFIG_PARAVIRT
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#include <asm/paravirt.h>
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#else /* !CONFIG_PARAVIRT */
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#define set_pte(ptep, pte) native_set_pte(ptep, pte)
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#define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
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#define set_pte_present(mm, addr, ptep, pte) \
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native_set_pte_present(mm, addr, ptep, pte)
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#define set_pte_atomic(ptep, pte) \
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native_set_pte_atomic(ptep, pte)
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#define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
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#ifndef __PAGETABLE_PUD_FOLDED
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#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
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#define pgd_clear(pgd) native_pgd_clear(pgd)
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#endif
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#ifndef set_pud
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# define set_pud(pudp, pud) native_set_pud(pudp, pud)
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#endif
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#ifndef __PAGETABLE_PMD_FOLDED
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#define pud_clear(pud) native_pud_clear(pud)
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#endif
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#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
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#define pmd_clear(pmd) native_pmd_clear(pmd)
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#define pte_update(mm, addr, ptep) do { } while (0)
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#define pte_update_defer(mm, addr, ptep) do { } while (0)
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static inline void __init paravirt_pagetable_setup_start(pgd_t *base)
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{
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native_pagetable_setup_start(base);
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}
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static inline void __init paravirt_pagetable_setup_done(pgd_t *base)
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{
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native_pagetable_setup_done(base);
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}
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#endif /* CONFIG_PARAVIRT */
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#endif /* __ASSEMBLY__ */
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#ifdef CONFIG_X86_32
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# include "pgtable_32.h"
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#else
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# include "pgtable_64.h"
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#endif
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/*
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* the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
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*
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* this macro returns the index of the entry in the pgd page which would
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* control the given virtual address
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*/
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#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
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/*
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* pgd_offset() returns a (pgd_t *)
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* pgd_index() is used get the offset into the pgd page's array of pgd_t's;
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*/
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#define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
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/*
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* a shortcut which implies the use of the kernel's pgd, instead
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* of a process's
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*/
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#define pgd_offset_k(address) pgd_offset(&init_mm, (address))
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#define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
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#define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
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#ifndef __ASSEMBLY__
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enum {
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PG_LEVEL_NONE,
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PG_LEVEL_4K,
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PG_LEVEL_2M,
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PG_LEVEL_1G,
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PG_LEVEL_NUM
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};
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#ifdef CONFIG_PROC_FS
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extern void update_page_count(int level, unsigned long pages);
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#else
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static inline void update_page_count(int level, unsigned long pages) { }
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#endif
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/*
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* Helper function that returns the kernel pagetable entry controlling
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* the virtual address 'address'. NULL means no pagetable entry present.
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* NOTE: the return type is pte_t but if the pmd is PSE then we return it
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* as a pte too.
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*/
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extern pte_t *lookup_address(unsigned long address, unsigned int *level);
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/* local pte updates need not use xchg for locking */
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static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
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{
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pte_t res = *ptep;
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/* Pure native function needs no input for mm, addr */
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native_pte_clear(NULL, 0, ptep);
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return res;
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}
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static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep , pte_t pte)
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{
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native_set_pte(ptep, pte);
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}
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#ifndef CONFIG_PARAVIRT
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/*
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* Rules for using pte_update - it must be called after any PTE update which
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* has not been done using the set_pte / clear_pte interfaces. It is used by
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* shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
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* updates should either be sets, clears, or set_pte_atomic for P->P
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* transitions, which means this hook should only be called for user PTEs.
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* This hook implies a P->P protection or access change has taken place, which
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* requires a subsequent TLB flush. The notification can optionally be delayed
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* until the TLB flush event by using the pte_update_defer form of the
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* interface, but care must be taken to assure that the flush happens while
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* still holding the same page table lock so that the shadow and primary pages
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* do not become out of sync on SMP.
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*/
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#define pte_update(mm, addr, ptep) do { } while (0)
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#define pte_update_defer(mm, addr, ptep) do { } while (0)
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#endif
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/*
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* We only update the dirty/accessed state if we set
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* the dirty bit by hand in the kernel, since the hardware
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* will do the accessed bit for us, and we don't want to
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* race with other CPU's that might be updating the dirty
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* bit at the same time.
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*/
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struct vm_area_struct;
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#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
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extern int ptep_set_access_flags(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep,
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pte_t entry, int dirty);
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#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
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extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep);
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#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
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extern int ptep_clear_flush_young(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep);
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#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
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static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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pte_t pte = native_ptep_get_and_clear(ptep);
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pte_update(mm, addr, ptep);
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return pte;
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}
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#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
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static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep,
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int full)
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{
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pte_t pte;
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if (full) {
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/*
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* Full address destruction in progress; paravirt does not
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* care about updates and native needs no locking
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*/
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pte = native_local_ptep_get_and_clear(ptep);
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} else {
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pte = ptep_get_and_clear(mm, addr, ptep);
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}
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return pte;
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}
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#define __HAVE_ARCH_PTEP_SET_WRPROTECT
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static inline void ptep_set_wrprotect(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
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pte_update(mm, addr, ptep);
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}
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/*
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* clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
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*
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* dst - pointer to pgd range anwhere on a pgd page
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* src - ""
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* count - the number of pgds to copy.
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*
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* dst and src can be on the same page, but the range must not overlap,
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* and must not cross a page boundary.
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*/
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static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
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{
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memcpy(dst, src, count * sizeof(pgd_t));
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}
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#include <asm-generic/pgtable.h>
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#endif /* __ASSEMBLY__ */
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#endif /* ASM_X86__PGTABLE_H */
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