141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/**************************************************************************
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*
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* This kernel module is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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**************************************************************************/
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/*
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* This code provides access to unexported mm kernel features. It is necessary
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* to use the new DRM memory manager code with kernels that don't support it
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* directly.
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*
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* Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
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* Linux kernel mm subsystem authors.
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* (Most code taken from there).
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*/
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#include "drmP.h"
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#include <asm/pgtable.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#ifdef MODULE
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void pgd_clear_bad(pgd_t * pgd)
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{
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pgd_ERROR(*pgd);
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pgd_clear(pgd);
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}
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void pud_clear_bad(pud_t * pud)
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{
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pud_ERROR(*pud);
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pud_clear(pud);
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}
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void pmd_clear_bad(pmd_t * pmd)
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{
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pmd_ERROR(*pmd);
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pmd_clear(pmd);
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}
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#endif
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static inline void change_pte_range(struct mm_struct *mm, pmd_t * pmd,
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unsigned long addr, unsigned long end)
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{
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pte_t *pte;
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pte = pte_offset_map(pmd, addr);
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do {
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if (pte_present(*pte)) {
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pte_t ptent;
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ptent = *pte;
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ptep_get_and_clear(mm, addr, pte);
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lazy_mmu_prot_update(ptent);
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}
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} while (pte++, addr += PAGE_SIZE, addr != end);
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pte_unmap(pte - 1);
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}
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static inline void change_pmd_range(struct mm_struct *mm, pud_t * pud,
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unsigned long addr, unsigned long end)
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{
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pmd_t *pmd;
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unsigned long next;
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pmd = pmd_offset(pud, addr);
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do {
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next = pmd_addr_end(addr, end);
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if (pmd_none_or_clear_bad(pmd))
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continue;
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change_pte_range(mm, pmd, addr, next);
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} while (pmd++, addr = next, addr != end);
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}
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static inline void change_pud_range(struct mm_struct *mm, pgd_t * pgd,
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unsigned long addr, unsigned long end)
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{
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pud_t *pud;
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unsigned long next;
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pud = pud_offset(pgd, addr);
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do {
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next = pud_addr_end(addr, end);
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if (pud_none_or_clear_bad(pud))
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continue;
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change_pmd_range(mm, pud, addr, next);
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} while (pud++, addr = next, addr != end);
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}
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/*
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* This function should be called with all relevant spinlocks held.
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*/
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void drm_clear_vma(struct vm_area_struct *vma,
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unsigned long addr, unsigned long end)
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{
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struct mm_struct *mm = vma->vm_mm;
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pgd_t *pgd;
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unsigned long next;
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#if defined(flush_tlb_mm) || !defined(MODULE)
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unsigned long start = addr;
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#endif
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BUG_ON(addr >= end);
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pgd = pgd_offset(mm, addr);
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flush_cache_range(vma, addr, end);
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do {
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next = pgd_addr_end(addr, end);
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if (pgd_none_or_clear_bad(pgd))
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continue;
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change_pud_range(mm, pgd, addr, next);
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} while (pgd++, addr = next, addr != end);
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#if defined(flush_tlb_mm) || !defined(MODULE)
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flush_tlb_range(vma, addr, end);
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#endif
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}
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pgprot_t vm_get_page_prot(unsigned long vm_flags)
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{
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#ifdef MODULE
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static pgprot_t drm_protection_map[16] = {
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__P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
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__S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111
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};
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return drm_protection_map[vm_flags & 0x0F];
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#else
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extern pgprot_t protection_map[];
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return protection_map[vm_flags & 0x0F];
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#endif
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};
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