| 0,0 → 1,218 |
|---|
| /* |
| * 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 amd64mm |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #include <arch/mm/page.h> |
| #include <genarch/mm/page_pt.h> |
| #include <arch/mm/frame.h> |
| #include <mm/page.h> |
| #include <mm/frame.h> |
| #include <mm/as.h> |
| #include <arch/interrupt.h> |
| #include <arch/asm.h> |
| #include <config.h> |
| #include <memstr.h> |
| #include <interrupt.h> |
| #include <print.h> |
| #include <panic.h> |
| #include <align.h> |
| |
| /* Definitions for identity page mapper */ |
| pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE))); |
| pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE))); |
| pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE))); |
| extern pte_t ptl_0; /* From boot.S */ |
| |
| #define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
| #define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
| #define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT)) |
| |
| #define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page)))) |
| #define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page)))) |
| #define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page)))) |
| |
| #define SETUP_PTL1(ptl0, page, tgt) { \ |
| SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \ |
| SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
| } |
| #define SETUP_PTL2(ptl1, page, tgt) { \ |
| SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \ |
| SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
| } |
| #define SETUP_PTL3(ptl2, page, tgt) { \ |
| SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \ |
| SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
| } |
| #define SETUP_FRAME(ptl3, page, tgt) { \ |
| SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \ |
| SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
| } |
| |
| |
| void page_arch_init(void) |
| { |
| uintptr_t cur; |
| int i; |
| int identity_flags = PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL; |
| |
| if (config.cpu_active == 1) { |
| page_mapping_operations = &pt_mapping_operations; |
| |
| /* |
| * PA2KA(identity) mapping for all frames. |
| */ |
| for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
| /* Standard identity mapping */ |
| page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags); |
| } |
| /* Upper kernel mapping |
| * - from zero to top of kernel (include bottom addresses |
| * because some are needed for init ) |
| */ |
| for (cur = PA2KA_CODE(0); cur < config.base+config.kernel_size; cur += FRAME_SIZE) { |
| page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags); |
| } |
| for (i=0; i < init.cnt; i++) { |
| for (cur=init.tasks[i].addr;cur < init.tasks[i].size; cur += FRAME_SIZE) { |
| page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags); |
| } |
| } |
| |
| exc_register(14, "page_fault", (iroutine)page_fault); |
| write_cr3((uintptr_t) AS_KERNEL->page_table); |
| } |
| else { |
| write_cr3((uintptr_t) AS_KERNEL->page_table); |
| } |
| } |
| |
| |
| /** Identity page mapper |
| * |
| * We need to map whole physical memory identically before the page subsystem |
| * is initializaed. This thing clears page table and fills in the specific |
| * items. |
| */ |
| void ident_page_fault(int n, istate_t *istate) |
| { |
| uintptr_t page; |
| static uintptr_t oldpage = 0; |
| pte_t *aptl_1, *aptl_2, *aptl_3; |
| |
| page = read_cr2(); |
| if (oldpage) { |
| /* Unmap old address */ |
| aptl_1 = PTL1_ADDR(&ptl_0, oldpage); |
| aptl_2 = PTL2_ADDR(aptl_1, oldpage); |
| aptl_3 = PTL3_ADDR(aptl_2, oldpage); |
| |
| SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
| if (KA2PA(aptl_3) == KA2PA(helper_ptl3)) |
| SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
| if (KA2PA(aptl_2) == KA2PA(helper_ptl2)) |
| SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
| if (KA2PA(aptl_1) == KA2PA(helper_ptl1)) |
| SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT); |
| } |
| if (PTL1_PRESENT(&ptl_0, page)) |
| aptl_1 = PTL1_ADDR(&ptl_0, page); |
| else { |
| SETUP_PTL1(&ptl_0, page, helper_ptl1); |
| aptl_1 = helper_ptl1; |
| } |
| |
| if (PTL2_PRESENT(aptl_1, page)) |
| aptl_2 = PTL2_ADDR(aptl_1, page); |
| else { |
| SETUP_PTL2(aptl_1, page, helper_ptl2); |
| aptl_2 = helper_ptl2; |
| } |
| |
| if (PTL3_PRESENT(aptl_2, page)) |
| aptl_3 = PTL3_ADDR(aptl_2, page); |
| else { |
| SETUP_PTL3(aptl_2, page, helper_ptl3); |
| aptl_3 = helper_ptl3; |
| } |
| |
| SETUP_FRAME(aptl_3, page, page); |
| |
| oldpage = page; |
| } |
| |
| |
| void page_fault(int n, istate_t *istate) |
| { |
| uintptr_t page; |
| pf_access_t access; |
| |
| page = read_cr2(); |
| |
| if (istate->error_word & PFERR_CODE_RSVD) |
| panic("Reserved bit set in page table entry.\n"); |
| |
| if (istate->error_word & PFERR_CODE_RW) |
| access = PF_ACCESS_WRITE; |
| else if (istate->error_word & PFERR_CODE_ID) |
| access = PF_ACCESS_EXEC; |
| else |
| access = PF_ACCESS_READ; |
| |
| if (as_page_fault(page, access, istate) == AS_PF_FAULT) { |
| fault_if_from_uspace(istate, "Page fault: %#x", page); |
| |
| print_info_errcode(n, istate); |
| printf("Page fault address: %llx\n", page); |
| panic("page fault\n"); |
| } |
| } |
| |
| |
| uintptr_t hw_map(uintptr_t physaddr, size_t size) |
| { |
| if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) |
| panic("Unable to map physical memory %p (%d bytes)", physaddr, size) |
| |
| uintptr_t virtaddr = PA2KA(last_frame); |
| pfn_t i; |
| for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) |
| page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE); |
| |
| last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE); |
| |
| return virtaddr; |
| } |
| |
| /** @} |
| */ |
| |