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/**************************************************************************
*
* This kernel module is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
**************************************************************************/
/*
* This code provides access to unexported mm kernel features. It is necessary
* to use the new DRM memory manager code with kernels that don't support it
* directly.
*
* Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
* Linux kernel mm subsystem authors.
* (Most code taken from there).
*/
#include "drmP.h"
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#ifdef MODULE
void pgd_clear_bad(pgd_t * pgd)
{
pgd_ERROR(*pgd);
pgd_clear(pgd);
}
void pud_clear_bad(pud_t * pud)
{
pud_ERROR(*pud);
pud_clear(pud);
}
void pmd_clear_bad(pmd_t * pmd)
{
pmd_ERROR(*pmd);
pmd_clear(pmd);
}
#endif
static inline void change_pte_range(struct mm_struct *mm, pmd_t * pmd,
unsigned long addr, unsigned long end)
{
pte_t *pte;
struct page *page;
unsigned long pfn;
pte = pte_offset_map(pmd, addr);
do {
if (pte_present(*pte)) {
pte_t ptent;
pfn = pte_pfn(*pte);
ptent = *pte;
ptep_get_and_clear(mm, addr, pte);
if (pfn_valid(pfn)) {
page = pfn_to_page(pfn);
if (atomic_add_negative(-1, &page->_mapcount)) {
if (page_test_and_clear_dirty(page))
set_page_dirty(page);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
dec_zone_page_state(page, NR_FILE_MAPPED);
#else
dec_page_state(nr_mapped);
#endif
}
put_page(page);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15)
dec_mm_counter(mm, file_rss);
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
dec_mm_counter(mm, rss);
#else
--mm->rss;
#endif
}
}
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap(pte - 1);
}
static inline void change_pmd_range(struct mm_struct *mm, pud_t * pud,
unsigned long addr, unsigned long end)
{
pmd_t *pmd;
unsigned long next;
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
if (pmd_none_or_clear_bad(pmd))
continue;
change_pte_range(mm, pmd, addr, next);
} while (pmd++, addr = next, addr != end);
}
static inline void change_pud_range(struct mm_struct *mm, pgd_t * pgd,
unsigned long addr, unsigned long end)
{
pud_t *pud;
unsigned long next;
pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud))
continue;
change_pmd_range(mm, pud, addr, next);
} while (pud++, addr = next, addr != end);
}
/*
* This function should be called with all relevant spinlocks held.
*/
void drm_clear_vma(struct vm_area_struct *vma,
unsigned long addr, unsigned long end)
{
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgd;
unsigned long next;
#if defined(flush_tlb_mm) || !defined(MODULE)
unsigned long start = addr;
#endif
BUG_ON(addr >= end);
pgd = pgd_offset(mm, addr);
flush_cache_range(vma, addr, end);
do {
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
continue;
change_pud_range(mm, pgd, addr, next);
} while (pgd++, addr = next, addr != end);
#if defined(flush_tlb_mm) || !defined(MODULE)
flush_tlb_range(vma, addr, end);
#endif
}
pgprot_t vm_get_page_prot(unsigned long vm_flags)
{
#ifdef MODULE
static pgprot_t drm_protection_map[16] = {
__P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
__S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111
};
return drm_protection_map[vm_flags & 0x0F];
#else
extern pgprot_t protection_map[];
return protection_map[vm_flags & 0x0F];
#endif
};
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