patch-2.4.22 linux-2.4.22/arch/mips/mm/umap.c

• Lines: 219
• Date: 1969-12-31 16:00:00.000000000 -0800
• Orig file: linux-2.4.21/arch/mips/mm/umap.c
• Orig date: 2002-11-28 15:53:10.000000000 -0800

diff -urN linux-2.4.21/arch/mips/mm/umap.c linux-2.4.22/arch/mips/mm/umap.c
@@ -1,218 +0,0 @@
-/*
- * (C) Copyright 1994 Linus Torvalds
- *
- * Changes:
- *
- * Modified from Linus source to removing active mappings from any
- * task.  This is required for implementing the virtual graphics
- * interface for direct rendering on the SGI - miguel.
- *
- * Added a routine to map a vmalloc()ed area into user space, this one
- * is required by the /dev/shmiq driver - miguel.
- */
-#include <linux/stat.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/smp_lock.h>
-#include <linux/shm.h>
-#include <linux/errno.h>
-#include <linux/mman.h>
-#include <linux/module.h>
-#include <linux/string.h>
-#include <linux/vmalloc.h>
-#include <linux/swap.h>
-
-#include <asm/system.h>
-#include <asm/pgalloc.h>
-#include <asm/page.h>
-
-static inline void
-remove_mapping_pte_range (pmd_t *pmd, unsigned long address, unsigned long size)
-{
-	pte_t *pte;
-	unsigned long end;
-
-	if (pmd_none (*pmd))
-		return;
-	if (pmd_bad (*pmd)){
-		printk ("remove_graphics_pte_range: bad pmd (%08lx)\n", pmd_val (*pmd));
-		pmd_clear (pmd);
-		return;
-	}
-	pte = pte_offset (pmd, address);
-	address &= ~PMD_MASK;
-	end = address + size;
-	if (end > PMD_SIZE)
-		end = PMD_SIZE;
-	do {
-		pte_t entry = *pte;
-		if (pte_present (entry))
-			set_pte (pte, pte_modify (entry, PAGE_NONE));
-		address += PAGE_SIZE;
-		pte++;
-	} while (address < end);
-
-}
-
-static inline void
-remove_mapping_pmd_range (pgd_t *pgd, unsigned long address, unsigned long size)
-{
-	pmd_t *pmd;
-	unsigned long end;
-
-	if (pgd_none (*pgd))
-		return;
-
-	if (pgd_bad (*pgd)){
-		printk ("remove_graphics_pmd_range: bad pgd (%08lx)\n", pgd_val (*pgd));
-		pgd_clear (pgd);
-		return;
-	}
-	pmd = pmd_offset (pgd, address);
-	address &= ~PGDIR_MASK;
-	end = address + size;
-	if (end > PGDIR_SIZE)
-		end = PGDIR_SIZE;
-	do {
-		remove_mapping_pte_range (pmd, address, end - address);
-		address = (address + PMD_SIZE) & PMD_MASK;
-		pmd++;
-	} while (address < end);
-
-}
-
-/*
- * This routine is called from the page fault handler to remove a
- * range of active mappings at this point
- */
-void
-remove_mapping (struct task_struct *task, unsigned long start, unsigned long end)
-{
-	unsigned long beg = start;
-	pgd_t *dir;
-
-	down_write (&task->mm->mmap_sem);
-	dir = pgd_offset (task->mm, start);
-	flush_cache_range (task->mm, beg, end);
-	while (start < end){
-		remove_mapping_pmd_range (dir, start, end - start);
-		start = (start + PGDIR_SIZE) & PGDIR_MASK;
-		dir++;
-	}
-	local_flush_tlb_range (task->mm, beg, end);
-	up_write (&task->mm->mmap_sem);
-}
-
-EXPORT_SYMBOL(remove_mapping);
-
-void *vmalloc_uncached (unsigned long size)
-{
-	return __vmalloc (size, GFP_KERNEL | __GFP_HIGHMEM,
-	                  PAGE_KERNEL_UNCACHED);
-}
-
-static inline void free_pte(pte_t page)
-{
-	if (pte_present(page)) {
-		struct page *ptpage = pte_page(page);
-		if ((!VALID_PAGE(ptpage)) || PageReserved(ptpage))
-			return;
-		__free_page(ptpage);
-		if (current->mm->rss <= 0)
-			return;
-		current->mm->rss--;
-		return;
-	}
-	swap_free(pte_to_swp_entry(page));
-}
-
-static inline void forget_pte(pte_t page)
-{
-	if (!pte_none(page)) {
-		printk("forget_pte: old mapping existed!\n");
-		free_pte(page);
-	}
-}
-
-/*
- * maps a range of vmalloc()ed memory into the requested pages. the old
- * mappings are removed.
- */
-static inline void
-vmap_pte_range (pte_t *pte, unsigned long address, unsigned long size, unsigned long vaddr)
-{
-	unsigned long end;
-	pgd_t *vdir;
-	pmd_t *vpmd;
-	pte_t *vpte;
-
-	address &= ~PMD_MASK;
-	end = address + size;
-	if (end > PMD_SIZE)
-		end = PMD_SIZE;
-	do {
-		pte_t oldpage = *pte;
-		struct page * page;
-		pte_clear(pte);
-
-		vdir = pgd_offset_k (vaddr);
-		vpmd = pmd_offset (vdir, vaddr);
-		vpte = pte_offset (vpmd, vaddr);
-		page = pte_page (*vpte);
-
-		set_pte(pte, mk_pte(page, PAGE_USERIO));
-		forget_pte(oldpage);
-		address += PAGE_SIZE;
-		vaddr += PAGE_SIZE;
-		pte++;
-	} while (address < end);
-}
-
-static inline int
-vmap_pmd_range (pmd_t *pmd, unsigned long address, unsigned long size, unsigned long vaddr)
-{
-	unsigned long end;
-
-	address &= ~PGDIR_MASK;
-	end = address + size;
-	if (end > PGDIR_SIZE)
-		end = PGDIR_SIZE;
-	vaddr -= address;
-	do {
-		pte_t * pte = pte_alloc(current->mm, pmd, address);
-		if (!pte)
-			return -ENOMEM;
-		vmap_pte_range(pte, address, end - address, address + vaddr);
-		address = (address + PMD_SIZE) & PMD_MASK;
-		pmd++;
-	} while (address < end);
-	return 0;
-}
-
-int
-vmap_page_range (unsigned long from, unsigned long size, unsigned long vaddr)
-{
-	int error = 0;
-	pgd_t * dir;
-	unsigned long beg = from;
-	unsigned long end = from + size;
-
-	vaddr -= from;
-	dir = pgd_offset(current->mm, from);
-	flush_cache_range(current->mm, beg, end);
-	while (from < end) {
-		pmd_t *pmd = pmd_alloc(current->mm, dir, from);
-		error = -ENOMEM;
-		if (!pmd)
-			break;
-		error = vmap_pmd_range(pmd, from, end - from, vaddr + from);
-		if (error)
-			break;
-		from = (from + PGDIR_SIZE) & PGDIR_MASK;
-		dir++;
-	}
-	local_flush_tlb_range(current->mm, beg, end);
-	return error;
-}