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Viewing changes to kernel/arch/amd64/src/mm/page.c

  • Committer: Martin Decky
  • Date: 2009-08-04 11:19:19 UTC
  • Revision ID: martin@uranus.dsrg.hide.ms.mff.cuni.cz-20090804111919-evyclddlr3v5lhmp
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kernel/arch/amd64/src/mm/page.c
 
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/*
 
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 * Copyright (c) 2001-2004 Jakub Jermar
 
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 * All rights reserved.
 
4
 *
 
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 * Redistribution and use in source and binary forms, with or without
 
6
 * 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.
 
11
 * - Redistributions in binary form must reproduce the above copyright
 
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 *   notice, this list of conditions and the following disclaimer in the
 
13
 *   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); \
 
75
    }
 
76
#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); \
 
79
    }
 
80
 
 
81
 
 
82
void page_arch_init(void)
 
83
{
 
84
        uintptr_t cur;
 
85
        unsigned int i;
 
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        int identity_flags = PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL | PAGE_WRITE;
 
87
 
 
88
        if (config.cpu_active == 1) {
 
89
                page_mapping_operations = &pt_mapping_operations;
 
90
 
 
91
                /*
 
92
                 * PA2KA(identity) mapping for all frames.
 
93
                 */
 
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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
 
100
                 * - from zero to top of kernel (include bottom addresses
 
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                 *   because some are needed for init)
 
102
                 */
 
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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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                }
 
113
 
 
114
                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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        } else 
 
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                write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
 
118
}
 
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120
 
 
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/** Identity page mapper
 
122
 *
 
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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.
 
126
 */
 
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void ident_page_fault(int n, istate_t *istate)
 
128
{
 
129
        uintptr_t page;
 
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        static uintptr_t oldpage = 0;
 
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        pte_t *aptl_1, *aptl_2, *aptl_3;
 
132
 
 
133
        page = read_cr2();
 
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        if (oldpage) {
 
135
                /* 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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140
                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);
 
150
        else {
 
151
                SETUP_PTL1(&ptl_0, page, helper_ptl1);
 
152
                aptl_1 = helper_ptl1;
 
153
        }
 
154
            
 
155
        if (PTL2_PRESENT(aptl_1, page)) 
 
156
                aptl_2 = PTL2_ADDR(aptl_1, page);
 
157
        else {
 
158
                SETUP_PTL2(aptl_1, page, helper_ptl2);
 
159
                aptl_2 = helper_ptl2;
 
160
        }
 
161
 
 
162
        if (PTL3_PRESENT(aptl_2, page))
 
163
                aptl_3 = PTL3_ADDR(aptl_2, page);
 
164
        else {
 
165
                SETUP_PTL3(aptl_2, page, helper_ptl3);
 
166
                aptl_3 = helper_ptl3;
 
167
        }
 
168
        
 
169
        SETUP_FRAME(aptl_3, page, page);
 
170
 
 
171
        oldpage = page;
 
172
}
 
173
 
 
174
 
 
175
void page_fault(int n, istate_t *istate)
 
176
{
 
177
        uintptr_t page;
 
178
        pf_access_t access;
 
179
        
 
180
        page = read_cr2();
 
181
        
 
182
        if (istate->error_word & PFERR_CODE_RSVD)
 
183
                panic("Reserved bit set in page table entry.");
 
184
        
 
185
        if (istate->error_word & PFERR_CODE_RW)
 
186
                access = PF_ACCESS_WRITE;
 
187
        else if (istate->error_word & PFERR_CODE_ID)
 
188
                access = PF_ACCESS_EXEC;
 
189
        else
 
190
                access = PF_ACCESS_READ;
 
191
        
 
192
        if (as_page_fault(page, access, istate) == AS_PF_FAULT) {
 
193
                fault_if_from_uspace(istate, "Page fault: %#x.", page);
 
194
 
 
195
                decode_istate(n, istate);
 
196
                printf("Page fault address: %llx.\n", page);
 
197
                panic("Page fault.");
 
198
        }
 
199
}
 
200
 
 
201
 
 
202
uintptr_t hw_map(uintptr_t physaddr, size_t size)
 
203
{
 
204
        if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
 
205
                panic("Unable to map physical memory %p (%d bytes).", physaddr, size)
 
206
        
 
207
        uintptr_t virtaddr = PA2KA(last_frame);
 
208
        pfn_t i;
 
209
        for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
 
210
                page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE | PAGE_WRITE);
 
211
        
 
212
        last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
 
213
        
 
214
        return virtaddr;
 
215
}
 
216
 
 
217
/** @}
 
218
 */