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| /* |
| * Copyright (c) 2005 Ondrej Palkovsky |
| * 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 amd64mm |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| /** Paging on AMD64 |
| * |
| * The space is divided in positive numbers - userspace and |
| * negative numbers - kernel space. The 'negative' space starting |
| * with 0xffff800000000000 and ending with 0xffffffff80000000 |
| * (-2GB) is identically mapped physical memory. The area |
| * (0xffffffff80000000 ... 0xffffffffffffffff is again identically |
| * mapped first 2GB. |
| * |
| * ATTENTION - PA2KA(KA2PA(x)) != x if 'x' is in kernel |
| */ |
| |
| #ifndef KERN_amd64_PAGE_H_ |
| #define KERN_amd64_PAGE_H_ |
| |
| #include <arch/mm/frame.h> |
| |
| #define PAGE_WIDTH FRAME_WIDTH |
| #define PAGE_SIZE FRAME_SIZE |
| |
| #define PAGE_COLOR_BITS 0 /* dummy */ |
| |
| #ifdef KERNEL |
| |
| #ifndef __ASM__ |
| # include <mm/mm.h> |
| # include <arch/types.h> |
| # include <arch/interrupt.h> |
| |
| static inline uintptr_t ka2pa(uintptr_t x) |
| { |
| if (x > 0xffffffff80000000) |
| return x - 0xffffffff80000000; |
| else |
| return x - 0xffff800000000000; |
| } |
| |
| # define KA2PA(x) ka2pa((uintptr_t) x) |
| # define PA2KA_CODE(x) (((uintptr_t) (x)) + 0xffffffff80000000) |
| # define PA2KA(x) (((uintptr_t) (x)) + 0xffff800000000000) |
| #else |
| # define KA2PA(x) ((x) - 0xffffffff80000000) |
| # define PA2KA(x) ((x) + 0xffffffff80000000) |
| #endif |
| |
| /* Number of entries in each level. */ |
| #define PTL0_ENTRIES_ARCH 512 |
| #define PTL1_ENTRIES_ARCH 512 |
| #define PTL2_ENTRIES_ARCH 512 |
| #define PTL3_ENTRIES_ARCH 512 |
| |
| /* Page table sizes for each level. */ |
| #define PTL0_SIZE_ARCH ONE_FRAME |
| #define PTL1_SIZE_ARCH ONE_FRAME |
| #define PTL2_SIZE_ARCH ONE_FRAME |
| #define PTL3_SIZE_ARCH ONE_FRAME |
| |
| /* Macros calculating indices into page tables in each level. */ |
| #define PTL0_INDEX_ARCH(vaddr) (((vaddr) >> 39) & 0x1ff) |
| #define PTL1_INDEX_ARCH(vaddr) (((vaddr) >> 30) & 0x1ff) |
| #define PTL2_INDEX_ARCH(vaddr) (((vaddr) >> 21) & 0x1ff) |
| #define PTL3_INDEX_ARCH(vaddr) (((vaddr) >> 12) & 0x1ff) |
| |
| /* Get PTE address accessors for each level. */ |
| #define GET_PTL1_ADDRESS_ARCH(ptl0, i) \ |
| ((pte_t *) ((((uint64_t) ((pte_t *) (ptl0))[(i)].addr_12_31) << 12) | \ |
| (((uint64_t) ((pte_t *) (ptl0))[(i)].addr_32_51) << 32))) |
| #define GET_PTL2_ADDRESS_ARCH(ptl1, i) \ |
| ((pte_t *) ((((uint64_t) ((pte_t *) (ptl1))[(i)].addr_12_31) << 12) | \ |
| (((uint64_t) ((pte_t *) (ptl1))[(i)].addr_32_51) << 32))) |
| #define GET_PTL3_ADDRESS_ARCH(ptl2, i) \ |
| ((pte_t *) ((((uint64_t) ((pte_t *) (ptl2))[(i)].addr_12_31) << 12) | \ |
| (((uint64_t) ((pte_t *) (ptl2))[(i)].addr_32_51) << 32))) |
| #define GET_FRAME_ADDRESS_ARCH(ptl3, i) \ |
| ((uintptr_t *) \ |
| ((((uint64_t) ((pte_t *) (ptl3))[(i)].addr_12_31) << 12) | \ |
| (((uint64_t) ((pte_t *) (ptl3))[(i)].addr_32_51) << 32))) |
| |
| /* Set PTE address accessors for each level. */ |
| #define SET_PTL0_ADDRESS_ARCH(ptl0) \ |
| (write_cr3((uintptr_t) (ptl0))) |
| #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) \ |
| set_pt_addr((pte_t *) (ptl0), (index_t) (i), a) |
| #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a) \ |
| set_pt_addr((pte_t *) (ptl1), (index_t) (i), a) |
| #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a) \ |
| set_pt_addr((pte_t *) (ptl2), (index_t) (i), a) |
| #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) \ |
| set_pt_addr((pte_t *) (ptl3), (index_t) (i), a) |
| |
| /* Get PTE flags accessors for each level. */ |
| #define GET_PTL1_FLAGS_ARCH(ptl0, i) \ |
| get_pt_flags((pte_t *) (ptl0), (index_t) (i)) |
| #define GET_PTL2_FLAGS_ARCH(ptl1, i) \ |
| get_pt_flags((pte_t *) (ptl1), (index_t) (i)) |
| #define GET_PTL3_FLAGS_ARCH(ptl2, i) \ |
| get_pt_flags((pte_t *) (ptl2), (index_t) (i)) |
| #define GET_FRAME_FLAGS_ARCH(ptl3, i) \ |
| get_pt_flags((pte_t *) (ptl3), (index_t) (i)) |
| |
| /* Set PTE flags accessors for each level. */ |
| #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) \ |
| set_pt_flags((pte_t *) (ptl1), (index_t) (i), (x)) |
| #define SET_PTL3_FLAGS_ARCH(ptl2, i, x) \ |
| set_pt_flags((pte_t *) (ptl2), (index_t) (i), (x)) |
| #define SET_FRAME_FLAGS_ARCH(ptl3, i, x) \ |
| set_pt_flags((pte_t *) (ptl3), (index_t) (i), (x)) |
| |
| /* Macros for querying the last-level PTE entries. */ |
| #define PTE_VALID_ARCH(p) \ |
| (*((uint64_t *) (p)) != 0) |
| #define PTE_PRESENT_ARCH(p) \ |
| ((p)->present != 0) |
| #define PTE_GET_FRAME_ARCH(p) \ |
| ((((uintptr_t) (p)->addr_12_31) << 12) | \ |
| ((uintptr_t) (p)->addr_32_51 << 32)) |
| #define PTE_WRITABLE_ARCH(p) \ |
| ((p)->writeable != 0) |
| #define PTE_EXECUTABLE_ARCH(p) \ |
| ((p)->no_execute == 0) |
| |
| #ifndef __ASM__ |
| |
| /* 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) |
| |
| /** When bit on this position os 1, the page fault was caused during instruction |
| * fecth. |
| */ |
| #define PFERR_CODE_ID (1 << 4) |
| |
| 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 | |
| (!p->no_execute) << PAGE_EXEC_SHIFT | |
| p->global << PAGE_GLOBAL_SHIFT); |
| } |
| |
| static inline void set_pt_addr(pte_t *pt, index_t i, uintptr_t a) |
| { |
| pte_t *p = &pt[i]; |
| |
| p->addr_12_31 = (a >> 12) & 0xfffff; |
| p->addr_32_51 = a >> 32; |
| } |
| |
| 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->no_execute = (flags & PAGE_EXEC) == 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 = 1; |
| } |
| |
| extern void page_arch_init(void); |
| extern void page_fault(int n, istate_t *istate); |
| |
| #endif /* __ASM__ */ |
| |
| #endif /* KERNEL */ |
| |
| #endif |
| |
| /** @} |
| */ |