| 1 | /*
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| 2 | * Copyright (c) 2007 Pavel Jancik
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| 3 | * Copyright (c) 2007 Michal Kebrt
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * - Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * - Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * - The name of the author may not be used to endorse or promote products
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| 16 | * derived from this software without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 28 | */
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| 29 |
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| 30 | /** @addtogroup arm32mm
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| 31 | * @{
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| 32 | */
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| 33 | /** @file
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| 34 | * @brief Paging related functions.
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| 35 | */
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| 36 |
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| 37 | #include <arch/mm/page.h>
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| 38 | #include <genarch/mm/page_pt.h>
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| 39 | #include <mm/page.h>
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| 40 | #include <arch/mm/frame.h>
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| 41 | #include <align.h>
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| 42 | #include <config.h>
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| 43 | #include <arch/exception.h>
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| 44 | #include <typedefs.h>
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| 45 | #include <interrupt.h>
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| 46 | #include <macros.h>
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| 47 |
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| 48 | /** Initializes page tables.
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| 49 | *
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| 50 | * 1:1 virtual-physical mapping is created in kernel address space. Mapping
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| 51 | * for table with exception vectors is also created.
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| 52 | */
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| 53 | void page_arch_init(void)
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| 54 | {
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| 55 | int flags = PAGE_CACHEABLE | PAGE_EXEC;
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| 56 | page_mapping_operations = &pt_mapping_operations;
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| 57 |
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| 58 | page_table_lock(AS_KERNEL, true);
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| 59 |
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| 60 | /* Kernel identity mapping */
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| 61 | //FIXME: We need to consider the possibility that
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| 62 | //identity_base > identity_size and physmem_end.
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| 63 | //This might lead to overflow if identity_size is too big.
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| 64 | for (uintptr_t cur = PHYSMEM_START_ADDR;
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| 65 | cur < min(KA2PA(config.identity_base) +
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| 66 | config.identity_size, config.physmem_end);
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| 67 | cur += FRAME_SIZE)
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| 68 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
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| 69 |
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| 70 | #ifdef HIGH_EXCEPTION_VECTORS
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| 71 | /* Create mapping for exception table at high offset */
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| 72 | uintptr_t ev_frame = frame_alloc(1, FRAME_NONE, 0);
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| 73 | page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, ev_frame, flags);
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| 74 | #else
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| 75 | #error "Only high exception vector supported now"
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| 76 | #endif
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| 77 |
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| 78 | page_table_unlock(AS_KERNEL, true);
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| 79 |
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| 80 | as_switch(NULL, AS_KERNEL);
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| 81 |
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| 82 | boot_page_table_free();
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| 83 | }
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| 84 |
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| 85 | /** @}
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| 86 | */
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