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73 lines
1.7 KiB
73 lines
1.7 KiB
/* |
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* Copyright (C) 2009 Wind River Systems Inc |
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* Implemented by [email protected] and [email protected] |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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*/ |
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#include <linux/mm.h> |
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#include <linux/sched.h> |
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#include <asm/cpuinfo.h> |
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/* pteaddr: |
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* ptbase | vpn* | zero |
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* 31-22 | 21-2 | 1-0 |
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* |
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* *vpn is preserved on double fault |
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* |
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* tlbacc: |
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* IG |*flags| pfn |
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* 31-25|24-20 | 19-0 |
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* |
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* *crwxg |
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* |
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* tlbmisc: |
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* resv |way |rd | we|pid |dbl|bad|perm|d |
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* 31-24 |23-20 |19 | 20|17-4|3 |2 |1 |0 |
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* |
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*/ |
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/* |
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* Initialize a new pgd / pmd table with invalid pointers. |
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*/ |
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static void pgd_init(pgd_t *pgd) |
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{ |
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unsigned long *p = (unsigned long *) pgd; |
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int i; |
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for (i = 0; i < USER_PTRS_PER_PGD; i += 8) { |
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p[i + 0] = (unsigned long) invalid_pte_table; |
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p[i + 1] = (unsigned long) invalid_pte_table; |
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p[i + 2] = (unsigned long) invalid_pte_table; |
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p[i + 3] = (unsigned long) invalid_pte_table; |
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p[i + 4] = (unsigned long) invalid_pte_table; |
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p[i + 5] = (unsigned long) invalid_pte_table; |
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p[i + 6] = (unsigned long) invalid_pte_table; |
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p[i + 7] = (unsigned long) invalid_pte_table; |
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} |
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} |
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pgd_t *pgd_alloc(struct mm_struct *mm) |
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{ |
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pgd_t *ret, *init; |
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ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER); |
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if (ret) { |
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init = pgd_offset(&init_mm, 0UL); |
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pgd_init(ret); |
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memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, |
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(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); |
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} |
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return ret; |
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} |
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void __init pagetable_init(void) |
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{ |
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/* Initialize the entire pgd. */ |
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pgd_init(swapper_pg_dir); |
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pgd_init(swapper_pg_dir + USER_PTRS_PER_PGD); |
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}
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