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219 palkovsky 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
219 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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#include <arch/mm/page.h>
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#include <genarch/mm/page_pt.h>
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#include <arch/mm/frame.h>
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#include <mm/page.h>
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#include <mm/frame.h>
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#include <mm/as.h>
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#include <arch/interrupt.h>
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#include <arch/asm.h>
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#include <config.h>
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#include <memstr.h>
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#include <interrupt.h>
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#include <print.h>
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#include <panic.h>
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#include <align.h>
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/* Definitions for identity page mapper */
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pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE)));
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pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE)));
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pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE)));
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extern pte_t ptl_0; /* From boot.S */
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#define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
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#define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
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#define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
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#define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page))))
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#define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page))))
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#define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page))))
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#define SETUP_PTL1(ptl0, page, tgt)  {  \
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    SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
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        SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
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    }
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#define SETUP_PTL2(ptl1, page, tgt)  {  \
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    SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
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        SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
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    }
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#define SETUP_PTL3(ptl2, page, tgt)  {  \
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    SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
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        SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
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    }
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#define SETUP_FRAME(ptl3, page, tgt)  { \
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    SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
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        SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
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    }
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void page_arch_init(void)
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{
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    uintptr_t cur;
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    int i;
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    int identity_flags = PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL;
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    if (config.cpu_active == 1) {
793 jermar 89
        page_mapping_operations = &pt_mapping_operations;
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226 palkovsky 91
        /*
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         * PA2KA(identity) mapping for all frames.
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         */
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        for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
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            /* Standard identity mapping */
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            page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);
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        }
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        /* Upper kernel mapping
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         * - from zero to top of kernel (include bottom addresses
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         *   because some are needed for init )
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         */
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        for (cur = PA2KA_CODE(0); cur < config.base + config.kernel_size; cur += FRAME_SIZE)
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            page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
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        for (cur = config.stack_base; cur < config.stack_base + config.stack_size; cur += FRAME_SIZE)
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            page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
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        for (i = 0; i < init.cnt; i++) {
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            for (cur = init.tasks[i].addr; cur < init.tasks[i].addr + init.tasks[i].size; cur += FRAME_SIZE)
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                page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags);
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        }
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        exc_register(14, "page_fault", (iroutine) page_fault);
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        write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
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    }
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    else {
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        write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
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    }
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}
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/** Identity page mapper
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 *
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 * We need to map whole physical memory identically before the page subsystem
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 * is initializaed. This thing clears page table and fills in the specific
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 * items.
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 */
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void ident_page_fault(int n, istate_t *istate)
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{
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    uintptr_t page;
131
    static uintptr_t oldpage = 0;
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    pte_t *aptl_1, *aptl_2, *aptl_3;
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134
    page = read_cr2();
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    if (oldpage) {
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        /* Unmap old address */
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        aptl_1 = PTL1_ADDR(&ptl_0, oldpage);
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        aptl_2 = PTL2_ADDR(aptl_1, oldpage);
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        aptl_3 = PTL3_ADDR(aptl_2, oldpage);
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        SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
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        if (KA2PA(aptl_3) == KA2PA(helper_ptl3))
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            SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
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        if (KA2PA(aptl_2) == KA2PA(helper_ptl2))
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            SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
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        if (KA2PA(aptl_1) == KA2PA(helper_ptl1))
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            SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
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    }
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    if (PTL1_PRESENT(&ptl_0, page))
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        aptl_1 = PTL1_ADDR(&ptl_0, page);
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    else {
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        SETUP_PTL1(&ptl_0, page, helper_ptl1);
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        aptl_1 = helper_ptl1;
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    }
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156
    if (PTL2_PRESENT(aptl_1, page))
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        aptl_2 = PTL2_ADDR(aptl_1, page);
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    else {
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        SETUP_PTL2(aptl_1, page, helper_ptl2);
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        aptl_2 = helper_ptl2;
161
    }
162
 
163
    if (PTL3_PRESENT(aptl_2, page))
164
        aptl_3 = PTL3_ADDR(aptl_2, page);
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    else {
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        SETUP_PTL3(aptl_2, page, helper_ptl3);
167
        aptl_3 = helper_ptl3;
168
    }
169
 
170
    SETUP_FRAME(aptl_3, page, page);
171
 
172
    oldpage = page;
173
}
174
 
1382 decky 175
 
1051 jermar 176
void page_fault(int n, istate_t *istate)
177
{
1780 jermar 178
    uintptr_t page;
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    pf_access_t access;
1051 jermar 180
 
181
    page = read_cr2();
1411 jermar 182
 
183
    if (istate->error_word & PFERR_CODE_RSVD)
184
        panic("Reserved bit set in page table entry.\n");
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186
    if (istate->error_word & PFERR_CODE_RW)
187
        access = PF_ACCESS_WRITE;
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    else if (istate->error_word & PFERR_CODE_ID)
189
        access = PF_ACCESS_EXEC;
190
    else
191
        access = PF_ACCESS_READ;
192
 
193
    if (as_page_fault(page, access, istate) == AS_PF_FAULT) {
1595 palkovsky 194
        fault_if_from_uspace(istate, "Page fault: %#x", page);
195
 
1958 decky 196
        decode_istate(n, istate);
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        printf("Page fault address: %llx\n", page);
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        panic("page fault\n");
199
    }
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}
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202
 
1780 jermar 203
uintptr_t hw_map(uintptr_t physaddr, size_t size)
1382 decky 204
{
205
    if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
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        panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
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    uintptr_t virtaddr = PA2KA(last_frame);
1382 decky 209
    pfn_t i;
210
    for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
211
        page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
212
 
213
    last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
214
 
215
    return virtaddr;
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}
1702 cejka 217
 
1888 jermar 218
/** @}
1702 cejka 219
 */