| 1 | /*
|
|---|
| 2 | * Copyright (c) 2007 Pavel Jancik
|
|---|
| 3 | * Copyright (c) 2007 Michal Kebrt
|
|---|
| 4 | * All rights reserved.
|
|---|
| 5 | *
|
|---|
| 6 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 7 | * modification, are permitted provided that the following conditions
|
|---|
| 8 | * are met:
|
|---|
| 9 | *
|
|---|
| 10 | * - Redistributions of source code must retain the above copyright
|
|---|
| 11 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 12 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 13 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 14 | * documentation and/or other materials provided with the distribution.
|
|---|
| 15 | * - The name of the author may not be used to endorse or promote products
|
|---|
| 16 | * derived from this software without specific prior written permission.
|
|---|
| 17 | *
|
|---|
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 28 | */
|
|---|
| 29 |
|
|---|
| 30 | /** @addtogroup arm32boot
|
|---|
| 31 | * @{
|
|---|
| 32 | */
|
|---|
| 33 | /** @file
|
|---|
| 34 | * @brief Memory management used while booting the kernel.
|
|---|
| 35 | *
|
|---|
| 36 | * So called "section" paging is used while booting the kernel. The term
|
|---|
| 37 | * "section" comes from the ARM architecture specification and stands for the
|
|---|
| 38 | * following: one-level paging, 1MB sized pages, 4096 entries in the page
|
|---|
| 39 | * table.
|
|---|
| 40 | */
|
|---|
| 41 |
|
|---|
| 42 | #ifndef BOOT_arm32__MM_H
|
|---|
| 43 | #define BOOT_arm32__MM_H
|
|---|
| 44 |
|
|---|
| 45 | #include <typedefs.h>
|
|---|
| 46 |
|
|---|
| 47 | /** Describe "section" page table entry (one-level paging with 1 MB sized pages). */
|
|---|
| 48 | #define PTE_DESCRIPTOR_SECTION 0x02
|
|---|
| 49 |
|
|---|
| 50 | /** Page table access rights: user - no access, kernel - read/write. */
|
|---|
| 51 | #define PTE_AP_USER_NO_KERNEL_RW 0x01
|
|---|
| 52 |
|
|---|
| 53 | /* Page table level 0 entry - "section" format is used
|
|---|
| 54 | * (one-level paging, 1 MB sized pages). Used only while booting the kernel.
|
|---|
| 55 | */
|
|---|
| 56 | typedef struct {
|
|---|
| 57 | unsigned int descriptor_type : 2;
|
|---|
| 58 | unsigned int bufferable : 1;
|
|---|
| 59 | unsigned int cacheable : 1;
|
|---|
| 60 | unsigned int xn : 1;
|
|---|
| 61 | unsigned int domain : 4;
|
|---|
| 62 | unsigned int should_be_zero_1 : 1;
|
|---|
| 63 | unsigned int access_permission_0 : 2;
|
|---|
| 64 | unsigned int tex : 3;
|
|---|
| 65 | unsigned int access_permission_1 : 2;
|
|---|
| 66 | unsigned int non_global : 1;
|
|---|
| 67 | unsigned int should_be_zero_2 : 1;
|
|---|
| 68 | unsigned int non_secure : 1;
|
|---|
| 69 | unsigned int section_base_addr : 12;
|
|---|
| 70 | } __attribute__((packed)) pte_level0_section_t;
|
|---|
| 71 |
|
|---|
| 72 | extern void mmu_start(void);
|
|---|
| 73 |
|
|---|
| 74 | #endif
|
|---|
| 75 |
|
|---|
| 76 | /** @}
|
|---|
| 77 | */
|
|---|
