projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| cbd15b3f LFT |
1 | /* |
| 2 | * Copyright (C) 2009 Wind River Systems Inc | |
| 3 | * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com | |
| 4 | * | |
| 5 | * This file is subject to the terms and conditions of the GNU General Public | |
| 6 | * License. See the file "COPYING" in the main directory of this archive | |
| 7 | * for more details. | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/mm.h> | |
| 11 | #include <linux/sched.h> | |
| 12 | ||
| 13 | #include <asm/pgtable.h> | |
| 14 | #include <asm/cpuinfo.h> | |
| 15 | ||
| 16 | /* pteaddr: | |
| 17 | * ptbase | vpn* | zero | |
| 18 | * 31-22 | 21-2 | 1-0 | |
| 19 | * | |
| 20 | * *vpn is preserved on double fault | |
| 21 | * | |
| 22 | * tlbacc: | |
| 23 | * IG |*flags| pfn | |
| 24 | * 31-25|24-20 | 19-0 | |
| 25 | * | |
| 26 | * *crwxg | |
| 27 | * | |
| 28 | * tlbmisc: | |
| 29 | * resv |way |rd | we|pid |dbl|bad|perm|d | |
| 30 | * 31-24 |23-20 |19 | 20|17-4|3 |2 |1 |0 | |
| 31 | * | |
| 32 | */ | |
| 33 | ||
| 34 | /* | |
| 35 | * Initialize a new pgd / pmd table with invalid pointers. | |
| 36 | */ | |
| 37 | static void pgd_init(pgd_t *pgd) | |
| 38 | { | |
| 39 | unsigned long *p = (unsigned long *) pgd; | |
| 40 | int i; | |
| 41 | ||
| 42 | for (i = 0; i < USER_PTRS_PER_PGD; i += 8) { | |
| 43 | p[i + 0] = (unsigned long) invalid_pte_table; | |
| 44 | p[i + 1] = (unsigned long) invalid_pte_table; | |
| 45 | p[i + 2] = (unsigned long) invalid_pte_table; | |
| 46 | p[i + 3] = (unsigned long) invalid_pte_table; | |
| 47 | p[i + 4] = (unsigned long) invalid_pte_table; | |
| 48 | p[i + 5] = (unsigned long) invalid_pte_table; | |
| 49 | p[i + 6] = (unsigned long) invalid_pte_table; | |
| 50 | p[i + 7] = (unsigned long) invalid_pte_table; | |
| 51 | } | |
| 52 | } | |
| 53 | ||
| 54 | pgd_t *pgd_alloc(struct mm_struct *mm) | |
| 55 | { | |
| 56 | pgd_t *ret, *init; | |
| 57 | ||
| 58 | ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER); | |
| 59 | if (ret) { | |
| 60 | init = pgd_offset(&init_mm, 0UL); | |
| 61 | pgd_init(ret); | |
| 62 | memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, | |
| 63 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); | |
| 64 | } | |
| 65 | ||
| 66 | return ret; | |
| 67 | } | |
| 68 | ||
| 69 | void __init pagetable_init(void) | |
| 70 | { | |
| 71 | /* Initialize the entire pgd. */ | |
| 72 | pgd_init(swapper_pg_dir); | |
| 73 | pgd_init(swapper_pg_dir + USER_PTRS_PER_PGD); | |
| 74 | } |