projects / ms2-kexec / blame
| Commit | Line | Data |
|---|---|---|
| 4e93cb00 MG |
1 | /* |
| 2 | * linux/arch/arm/mm/mmu.c | |
| 3 | * | |
| 4 | * Copyright (C) 1995-2005 Russell King | |
| 5 | * This Edition is maintained by Matthew Veety (aliasxerog) <mveety@gmail.com> | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | */ | |
| 11 | #include <linux/module.h> | |
| 12 | #include <linux/kernel.h> | |
| 13 | #include <linux/errno.h> | |
| 14 | #include <linux/init.h> | |
| 15 | #include <linux/bootmem.h> | |
| 16 | #include <linux/mman.h> | |
| 17 | #include <linux/nodemask.h> | |
| 18 | #include <linux/ioport.h> | |
| 19 | #include <linux/lttlite-events.h> | |
| 20 | ||
| 21 | #include <asm/cputype.h> | |
| 22 | #include <asm/mach-types.h> | |
| 23 | #include <asm/sections.h> | |
| 24 | #include <asm/setup.h> | |
| 25 | #include <asm/sizes.h> | |
| 26 | #include <asm/tlb.h> | |
| 27 | #include <asm/pgtable.h> | |
| 28 | ||
| 29 | #include <asm/mach/arch.h> | |
| 30 | #include <asm/mach/map.h> | |
| 31 | ||
| 32 | #include "mm.h" | |
| 33 | ||
| 34 | /* | |
| 35 | * In order to soft-boot, we need to insert a 1:1 mapping in place of | |
| 36 | * the user-mode pages. This will then ensure that we have predictable | |
| 37 | * results when turning the mmu off | |
| 38 | */ | |
| 39 | void setup_mm_for_reboot(char mode) | |
| 40 | { | |
| 41 | unsigned long base_pmdval; | |
| 42 | pgd_t *pgd; | |
| 43 | int i; | |
| 44 | ||
| 45 | if (current->mm && current->mm->pgd) | |
| 46 | pgd = current->mm->pgd; | |
| 47 | else | |
| 48 | pgd = init_mm.pgd; | |
| 49 | ||
| 50 | base_pmdval = PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | PMD_TYPE_SECT; | |
| 51 | ||
| 52 | for (i = 0; i < FIRST_USER_PGD_NR + USER_PTRS_PER_PGD; i++, pgd++) { | |
| 53 | unsigned long pmdval = (i << PGDIR_SHIFT) | base_pmdval; | |
| 54 | pmd_t *pmd; | |
| 55 | ||
| 56 | pmd = pmd_off(pgd, i << PGDIR_SHIFT); | |
| 57 | pmd[0] = __pmd(pmdval); | |
| 58 | pmd[1] = __pmd(pmdval + (1 << (PGDIR_SHIFT - 1))); | |
| 59 | flush_pmd_entry(pmd); | |
| 60 | } | |
| 61 | } |