0,0 → 1,163 |
/* |
* Copyright (C) 2001-2004 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
#ifndef __ia32_PAGE_H__ |
#define __ia32_PAGE_H__ |
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#include <arch/mm/frame.h> |
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#define PAGE_WIDTH FRAME_WIDTH |
#define PAGE_SIZE FRAME_SIZE |
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#ifdef KERNEL |
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#ifndef __ASM__ |
# define KA2PA(x) (((__address) (x)) - 0x80000000) |
# define PA2KA(x) (((__address) (x)) + 0x80000000) |
#else |
# define KA2PA(x) ((x) - 0x80000000) |
# define PA2KA(x) ((x) + 0x80000000) |
#endif |
|
/* |
* Implementation of generic 4-level page table interface. |
* IA-32 has 2-level page tables, so PTL1 and PTL2 are left out. |
*/ |
#define PTL0_ENTRIES_ARCH 1024 |
#define PTL1_ENTRIES_ARCH 0 |
#define PTL2_ENTRIES_ARCH 0 |
#define PTL3_ENTRIES_ARCH 1024 |
|
#define PTL0_INDEX_ARCH(vaddr) (((vaddr)>>22)&0x3ff) |
#define PTL1_INDEX_ARCH(vaddr) 0 |
#define PTL2_INDEX_ARCH(vaddr) 0 |
#define PTL3_INDEX_ARCH(vaddr) (((vaddr)>>12)&0x3ff) |
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#define GET_PTL1_ADDRESS_ARCH(ptl0, i) ((pte_t *)((((pte_t *)(ptl0))[(i)].frame_address)<<12)) |
#define GET_PTL2_ADDRESS_ARCH(ptl1, i) (ptl1) |
#define GET_PTL3_ADDRESS_ARCH(ptl2, i) (ptl2) |
#define GET_FRAME_ADDRESS_ARCH(ptl3, i) ((__address)((((pte_t *)(ptl3))[(i)].frame_address)<<12)) |
|
#define SET_PTL0_ADDRESS_ARCH(ptl0) (write_cr3((__address) (ptl0))) |
#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) (((pte_t *)(ptl0))[(i)].frame_address = (a)>>12) |
#define SET_PTL2_ADDRESS_ARCH(ptl1, i, a) |
#define SET_PTL3_ADDRESS_ARCH(ptl2, i, a) |
#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) (((pte_t *)(ptl3))[(i)].frame_address = (a)>>12) |
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#define GET_PTL1_FLAGS_ARCH(ptl0, i) get_pt_flags((pte_t *)(ptl0), (index_t)(i)) |
#define GET_PTL2_FLAGS_ARCH(ptl1, i) PAGE_PRESENT |
#define GET_PTL3_FLAGS_ARCH(ptl2, i) PAGE_PRESENT |
#define GET_FRAME_FLAGS_ARCH(ptl3, i) get_pt_flags((pte_t *)(ptl3), (index_t)(i)) |
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#define SET_PTL1_FLAGS_ARCH(ptl0, i, x) set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x)) |
#define SET_PTL2_FLAGS_ARCH(ptl1, i, x) |
#define SET_PTL3_FLAGS_ARCH(ptl2, i, x) |
#define SET_FRAME_FLAGS_ARCH(ptl3, i, x) set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x)) |
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#define PTE_VALID_ARCH(p) (*((__u32 *) (p)) != 0) |
#define PTE_PRESENT_ARCH(p) ((p)->present != 0) |
#define PTE_GET_FRAME_ARCH(p) ((p)->frame_address<<FRAME_WIDTH) |
#define PTE_WRITABLE_ARCH(p) ((p)->writeable != 0) |
#define PTE_EXECUTABLE_ARCH(p) 1 |
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#ifndef __ASM__ |
|
#include <mm/page.h> |
#include <arch/types.h> |
#include <arch/mm/frame.h> |
#include <typedefs.h> |
|
/* Page fault error codes. */ |
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/** When bit on this position is 0, the page fault was caused by a not-present page. */ |
#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. */ |
#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. */ |
#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. */ |
#define PFERR_CODE_RSVD (1<<3) |
|
/** Page Table Entry. */ |
struct page_specifier { |
unsigned present : 1; |
unsigned writeable : 1; |
unsigned uaccessible : 1; |
unsigned page_write_through : 1; |
unsigned page_cache_disable : 1; |
unsigned accessed : 1; |
unsigned dirty : 1; |
unsigned pat : 1; |
unsigned global : 1; |
unsigned soft_valid : 1; /**< Valid content even if the present bit is not set. */ |
unsigned avl : 2; |
unsigned frame_address : 20; |
} __attribute__ ((packed)); |
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static inline int get_pt_flags(pte_t *pt, index_t i) |
{ |
pte_t *p = &pt[i]; |
|
return ( |
(!p->page_cache_disable)<<PAGE_CACHEABLE_SHIFT | |
(!p->present)<<PAGE_PRESENT_SHIFT | |
p->uaccessible<<PAGE_USER_SHIFT | |
1<<PAGE_READ_SHIFT | |
p->writeable<<PAGE_WRITE_SHIFT | |
1<<PAGE_EXEC_SHIFT | |
p->global<<PAGE_GLOBAL_SHIFT |
); |
} |
|
static inline void set_pt_flags(pte_t *pt, index_t i, int flags) |
{ |
pte_t *p = &pt[i]; |
|
p->page_cache_disable = !(flags & PAGE_CACHEABLE); |
p->present = !(flags & PAGE_NOT_PRESENT); |
p->uaccessible = (flags & PAGE_USER) != 0; |
p->writeable = (flags & PAGE_WRITE) != 0; |
p->global = (flags & PAGE_GLOBAL) != 0; |
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/* |
* Ensure that there is at least one bit set even if the present bit is cleared. |
*/ |
p->soft_valid = true; |
} |
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extern void page_arch_init(void); |
extern void page_fault(int n, istate_t *istate); |
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#endif /* __ASM__ */ |
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#endif /* KERNEL */ |
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#endif |