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164 palkovsky 1
/*
2071 jermar 2
 * Copyright (c) 2005 Ondrej Palkovsky
164 palkovsky 3
 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup amd64mm
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 * @{
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 */
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/** @file
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 */
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/** Paging on AMD64
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 *
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 * The space is divided in positive numbers - userspace and
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 * negative numbers - kernel space. The 'negative' space starting
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 * with 0xffff800000000000 and ending with 0xffffffff80000000
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 * (-2GB) is identically mapped physical memory. The area
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 * (0xffffffff80000000 ... 0xffffffffffffffff is again identically
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 * mapped first 2GB.
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 *
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 * ATTENTION - PA2KA(KA2PA(x)) != x if 'x' is in kernel
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 */
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#ifndef KERN_amd64_PAGE_H_
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#define KERN_amd64_PAGE_H_
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#include <arch/mm/frame.h>
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#define PAGE_WIDTH  FRAME_WIDTH
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#define PAGE_SIZE   FRAME_SIZE
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#ifdef KERNEL
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#ifndef __ASM__
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#   include <mm/mm.h>
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#   include <arch/types.h>
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#   include <arch/interrupt.h>
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1780 jermar 62
static inline uintptr_t ka2pa(uintptr_t x)
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{
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    if (x > 0xffffffff80000000)
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        return x - 0xffffffff80000000;
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    else
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        return x - 0xffff800000000000;
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}
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#   define KA2PA(x)     ka2pa((uintptr_t) x)
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#   define PA2KA_CODE(x)    (((uintptr_t) (x)) + 0xffffffff80000000)
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#   define PA2KA(x)     (((uintptr_t) (x)) + 0xffff800000000000)
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#else
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#   define KA2PA(x)     ((x) - 0xffffffff80000000)
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#   define PA2KA(x)     ((x) + 0xffffffff80000000)
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#endif
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/* Number of entries in each level. */
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#define PTL0_ENTRIES_ARCH   512
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#define PTL1_ENTRIES_ARCH   512
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#define PTL2_ENTRIES_ARCH   512
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#define PTL3_ENTRIES_ARCH   512
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2467 jermar 84
/* Page table sizes for each level. */
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#define PTL0_SIZE_ARCH      ONE_FRAME
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#define PTL1_SIZE_ARCH      ONE_FRAME
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#define PTL2_SIZE_ARCH      ONE_FRAME
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#define PTL3_SIZE_ARCH      ONE_FRAME
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/* Macros calculating indices into page tables in each level. */
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#define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 39) & 0x1ff)
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#define PTL1_INDEX_ARCH(vaddr)  (((vaddr) >> 30) & 0x1ff)
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#define PTL2_INDEX_ARCH(vaddr)  (((vaddr) >> 21) & 0x1ff)
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#define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x1ff)
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/* Get PTE address accessors for each level. */
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#define GET_PTL1_ADDRESS_ARCH(ptl0, i) \
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    ((pte_t *) ((((uint64_t) ((pte_t *) (ptl0))[(i)].addr_12_31) << 12) | \
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        (((uint64_t) ((pte_t *) (ptl0))[(i)].addr_32_51) << 32)))
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#define GET_PTL2_ADDRESS_ARCH(ptl1, i) \
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    ((pte_t *) ((((uint64_t) ((pte_t *) (ptl1))[(i)].addr_12_31) << 12) | \
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        (((uint64_t) ((pte_t *) (ptl1))[(i)].addr_32_51) << 32)))
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#define GET_PTL3_ADDRESS_ARCH(ptl2, i) \
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    ((pte_t *) ((((uint64_t) ((pte_t *) (ptl2))[(i)].addr_12_31) << 12) | \
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        (((uint64_t) ((pte_t *) (ptl2))[(i)].addr_32_51) << 32)))
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#define GET_FRAME_ADDRESS_ARCH(ptl3, i) \
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    ((uintptr_t *) \
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        ((((uint64_t) ((pte_t *) (ptl3))[(i)].addr_12_31) << 12) | \
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        (((uint64_t) ((pte_t *) (ptl3))[(i)].addr_32_51) << 32)))
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/* Set PTE address accessors for each level. */
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#define SET_PTL0_ADDRESS_ARCH(ptl0) \
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    (write_cr3((uintptr_t) (ptl0)))
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#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) \
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    set_pt_addr((pte_t *) (ptl0), (size_t) (i), a)
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#define SET_PTL2_ADDRESS_ARCH(ptl1, i, a) \
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    set_pt_addr((pte_t *) (ptl1), (size_t) (i), a)
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#define SET_PTL3_ADDRESS_ARCH(ptl2, i, a) \
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    set_pt_addr((pte_t *) (ptl2), (size_t) (i), a)
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#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) \
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    set_pt_addr((pte_t *) (ptl3), (size_t) (i), a)
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/* Get PTE flags accessors for each level. */
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#define GET_PTL1_FLAGS_ARCH(ptl0, i) \
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    get_pt_flags((pte_t *) (ptl0), (size_t) (i))
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#define GET_PTL2_FLAGS_ARCH(ptl1, i) \
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    get_pt_flags((pte_t *) (ptl1), (size_t) (i))
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#define GET_PTL3_FLAGS_ARCH(ptl2, i) \
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    get_pt_flags((pte_t *) (ptl2), (size_t) (i))
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#define GET_FRAME_FLAGS_ARCH(ptl3, i) \
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    get_pt_flags((pte_t *) (ptl3), (size_t) (i))
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/* Set PTE flags accessors for each level. */
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#define SET_PTL1_FLAGS_ARCH(ptl0, i, x) \
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    set_pt_flags((pte_t *) (ptl0), (size_t) (i), (x))
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#define SET_PTL2_FLAGS_ARCH(ptl1, i, x) \
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    set_pt_flags((pte_t *) (ptl1), (size_t) (i), (x))
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#define SET_PTL3_FLAGS_ARCH(ptl2, i, x) \
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    set_pt_flags((pte_t *) (ptl2), (size_t) (i), (x))
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#define SET_FRAME_FLAGS_ARCH(ptl3, i, x) \
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    set_pt_flags((pte_t *) (ptl3), (size_t) (i), (x))
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2467 jermar 143
/* Macros for querying the last-level PTE entries. */
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#define PTE_VALID_ARCH(p) \
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    (*((uint64_t *) (p)) != 0)
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#define PTE_PRESENT_ARCH(p) \
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    ((p)->present != 0)
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#define PTE_GET_FRAME_ARCH(p) \
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    ((((uintptr_t) (p)->addr_12_31) << 12) | \
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        ((uintptr_t) (p)->addr_32_51 << 32))
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#define PTE_WRITABLE_ARCH(p) \
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    ((p)->writeable != 0)
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#define PTE_EXECUTABLE_ARCH(p) \
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    ((p)->no_execute == 0)
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226 palkovsky 156
#ifndef __ASM__
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/* Page fault error codes. */
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/** When bit on this position is 0, the page fault was caused by a not-present
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 * page.
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 */
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#define PFERR_CODE_P            (1 << 0)  
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/** When bit on this position is 1, the page fault was caused by a write. */
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#define PFERR_CODE_RW           (1 << 1)
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/** When bit on this position is 1, the page fault was caused in user mode. */
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#define PFERR_CODE_US           (1 << 2)
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/** When bit on this position is 1, a reserved bit was set in page directory. */
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#define PFERR_CODE_RSVD         (1 << 3)
1411 jermar 173
 
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/** When bit on this position os 1, the page fault was caused during instruction
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 * fecth.
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 */
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#define PFERR_CODE_ID       (1 << 4)
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4691 svoboda 179
static inline int get_pt_flags(pte_t *pt, size_t i)
226 palkovsky 180
{
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    pte_t *p = &pt[i];
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2467 jermar 183
    return ((!p->page_cache_disable) << PAGE_CACHEABLE_SHIFT |
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        (!p->present) << PAGE_PRESENT_SHIFT |
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        p->uaccessible << PAGE_USER_SHIFT |
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        1 << PAGE_READ_SHIFT |
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        p->writeable << PAGE_WRITE_SHIFT |
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        (!p->no_execute) << PAGE_EXEC_SHIFT |
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        p->global << PAGE_GLOBAL_SHIFT);
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}
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4691 svoboda 192
static inline void set_pt_addr(pte_t *pt, size_t i, uintptr_t a)
226 palkovsky 193
{
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    pte_t *p = &pt[i];
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196
    p->addr_12_31 = (a >> 12) & 0xfffff;
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    p->addr_32_51 = a >> 32;
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}
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4691 svoboda 200
static inline void set_pt_flags(pte_t *pt, size_t i, int flags)
226 palkovsky 201
{
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    pte_t *p = &pt[i];
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    p->page_cache_disable = !(flags & PAGE_CACHEABLE);
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    p->present = !(flags & PAGE_NOT_PRESENT);
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    p->uaccessible = (flags & PAGE_USER) != 0;
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    p->writeable = (flags & PAGE_WRITE) != 0;
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    p->no_execute = (flags & PAGE_EXEC) == 0;
825 jermar 209
    p->global = (flags & PAGE_GLOBAL) != 0;
831 jermar 210
 
211
    /*
212
     * Ensure that there is at least one bit set even if the present bit is cleared.
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     */
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    p->soft_valid = 1;
226 palkovsky 215
}
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164 palkovsky 217
extern void page_arch_init(void);
1958 decky 218
extern void page_fault(int n, istate_t *istate);
164 palkovsky 219
 
967 palkovsky 220
#endif /* __ASM__ */
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967 palkovsky 222
#endif /* KERNEL */
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164 palkovsky 224
#endif
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1780 jermar 226
/** @}
1702 cejka 227
 */