![Wu Fei](/assets/img/avatar_default.png)
By combining swapper_pg_dir and module_pg_dir, several if conditions can be eliminated from the tlb exception handler. The reason they can be combined is that, the effective virtual address of vmalloc returned is at the bottom, and of module_alloc returned is at the top. It also fixes the bug in vmalloc(), which happens when its return address is not covered by the first pgd. Signed-off-by: Wu Fei <at.wufei@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/*
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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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* Copyright (C) 1999, 2000 by Silicon Graphics
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* Copyright (C) 2003 by Ralf Baechle
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <asm/fixmap.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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void pgd_init(unsigned long page)
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{
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unsigned long *p, *end;
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p = (unsigned long *) page;
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end = p + PTRS_PER_PGD;
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while (p < end) {
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p[0] = (unsigned long) invalid_pmd_table;
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p[1] = (unsigned long) invalid_pmd_table;
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p[2] = (unsigned long) invalid_pmd_table;
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p[3] = (unsigned long) invalid_pmd_table;
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p[4] = (unsigned long) invalid_pmd_table;
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p[5] = (unsigned long) invalid_pmd_table;
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p[6] = (unsigned long) invalid_pmd_table;
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p[7] = (unsigned long) invalid_pmd_table;
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p += 8;
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}
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}
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void pmd_init(unsigned long addr, unsigned long pagetable)
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{
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unsigned long *p, *end;
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p = (unsigned long *) addr;
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end = p + PTRS_PER_PMD;
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while (p < end) {
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p[0] = (unsigned long)pagetable;
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p[1] = (unsigned long)pagetable;
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p[2] = (unsigned long)pagetable;
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p[3] = (unsigned long)pagetable;
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p[4] = (unsigned long)pagetable;
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p[5] = (unsigned long)pagetable;
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p[6] = (unsigned long)pagetable;
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p[7] = (unsigned long)pagetable;
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p += 8;
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}
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}
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void __init pagetable_init(void)
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{
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unsigned long vaddr;
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pgd_t *pgd_base;
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/* Initialize the entire pgd. */
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pgd_init((unsigned long)swapper_pg_dir);
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pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
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pgd_base = swapper_pg_dir;
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/*
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* Fixed mappings:
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*/
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vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
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fixrange_init(vaddr, 0, pgd_base);
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}
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