| 0,0 → 1,172 |
|---|
| /* |
| * 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. |
| */ |
| |
| /** @addtogroup xen32mm |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #ifndef __xen32_PAGE_H__ |
| #define __xen32_PAGE_H__ |
| |
| #include <arch/mm/frame.h> |
| |
| #define PAGE_WIDTH FRAME_WIDTH |
| #define PAGE_SIZE FRAME_SIZE |
| |
| #ifdef KERNEL |
| |
| #ifndef __ASM__ |
| # define KA2PA(x) (((uintptr_t) (x)) - 0x80000000) |
| # define PA2KA(x) (((uintptr_t) (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) |
| |
| #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) ((uintptr_t)((((pte_t *)(ptl3))[(i)].frame_address)<<12)) |
| |
| #define SET_PTL0_ADDRESS_ARCH(ptl0) (write_cr3((uintptr_t) (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) |
| |
| #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)) |
| |
| #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)) |
| |
| #define PTE_VALID_ARCH(p) (*((uint32_t *) (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 |
| |
| #ifndef __ASM__ |
| |
| #include <mm/page.h> |
| #include <arch/types.h> |
| #include <arch/mm/frame.h> |
| #include <typedefs.h> |
| |
| /* Page fault error codes. */ |
| |
| /** When bit on this position is 0, the page fault was caused by a not-present page. */ |
| #define PFERR_CODE_P (1<<0) |
| |
| /** When bit on this position is 1, the page fault was caused by a write. */ |
| #define PFERR_CODE_RW (1<<1) |
| |
| /** When bit on this position is 1, the page fault was caused in user mode. */ |
| #define PFERR_CODE_US (1<<2) |
| |
| /** 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)); |
| |
| 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; |
| |
| /* |
| * Ensure that there is at least one bit set even if the present bit is cleared. |
| */ |
| p->soft_valid = true; |
| } |
| |
| extern void page_arch_init(void); |
| extern void page_fault(int n, istate_t *istate); |
| |
| #endif /* __ASM__ */ |
| |
| #endif /* KERNEL */ |
| |
| #endif |
| |
| /** @} |
| */ |