| 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 arm32boot
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| 31 | * @{
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| 32 | */
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| 33 | /** @file
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| 34 | * @brief Memory management used while booting the kernel.
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| 35 | *
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| 36 | * So called "section" paging is used while booting the kernel. The term
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| 37 | * "section" comes from the ARM architecture specification and stands for the
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| 38 | * following: one-level paging, 1MB sized pages, 4096 entries in the page
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| 39 | * table.
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| 40 | */
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| 41 |
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| 42 | #ifndef BOOT_arm32__MM_H
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| 43 | #define BOOT_arm32__MM_H
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| 44 |
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| 45 | #include <typedefs.h>
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| 46 |
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| 47 | /** Describe "section" page table entry (one-level paging with 1 MB sized pages). */
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| 48 | #define PTE_DESCRIPTOR_SECTION 0x02
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| 49 |
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| 50 | /** Page table access rights: user - no access, kernel - read/write. */
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| 51 | #define PTE_AP_USER_NO_KERNEL_RW 0x01
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| 52 |
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| 53 | /* Page table level 0 entry - "section" format is used
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| 54 | * (one-level paging, 1 MB sized pages). Used only while booting the kernel.
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| 55 | */
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| 56 | typedef struct {
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| 57 | unsigned int descriptor_type : 2;
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| 58 | unsigned int bufferable : 1;
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| 59 | unsigned int cacheable : 1;
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| 60 | unsigned int impl_specific : 1;
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| 61 | unsigned int domain : 4;
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| 62 | unsigned int should_be_zero_1 : 1;
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| 63 | unsigned int access_permission : 2;
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| 64 | unsigned int should_be_zero_2 : 8;
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| 65 | unsigned int section_base_addr : 12;
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| 66 | } __attribute__((packed)) pte_level0_section_t;
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| 67 |
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| 68 | extern void mmu_start(void);
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| 69 |
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| 70 | #endif
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| 71 |
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| 72 | /** @}
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| 73 | */
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