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author | kaf24@scramble.cl.cam.ac.uk <kaf24@scramble.cl.cam.ac.uk> | 2004-06-09 16:36:08 +0000 |
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committer | kaf24@scramble.cl.cam.ac.uk <kaf24@scramble.cl.cam.ac.uk> | 2004-06-09 16:36:08 +0000 |
commit | 03907beb680ee39bee212bb3cb170cb295238cda (patch) | |
tree | f594d4df409070fe7f41cb1709f1ae22b76ac17c /xenolinux-2.4.26-sparse/mm/vmalloc.c | |
parent | 63cf7286eeb40cadb2581fef38376da82a25b2ba (diff) | |
download | xen-03907beb680ee39bee212bb3cb170cb295238cda.tar.gz xen-03907beb680ee39bee212bb3cb170cb295238cda.tar.bz2 xen-03907beb680ee39bee212bb3cb170cb295238cda.zip |
bitkeeper revision 1.946 (40c73c7805slPvnfEohXfQoiriAESg)
Rename Linux directories and upgrade build system.
Diffstat (limited to 'xenolinux-2.4.26-sparse/mm/vmalloc.c')
-rw-r--r-- | xenolinux-2.4.26-sparse/mm/vmalloc.c | 388 |
1 files changed, 0 insertions, 388 deletions
diff --git a/xenolinux-2.4.26-sparse/mm/vmalloc.c b/xenolinux-2.4.26-sparse/mm/vmalloc.c deleted file mode 100644 index b030270b42..0000000000 --- a/xenolinux-2.4.26-sparse/mm/vmalloc.c +++ /dev/null @@ -1,388 +0,0 @@ -/* - * linux/mm/vmalloc.c - * - * Copyright (C) 1993 Linus Torvalds - * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 - * SMP-safe vmalloc/vfree/ioremap, Tigran Aivazian <tigran@veritas.com>, May 2000 - */ - -#include <linux/config.h> -#include <linux/slab.h> -#include <linux/vmalloc.h> -#include <linux/spinlock.h> -#include <linux/highmem.h> -#include <linux/smp_lock.h> - -#include <asm/uaccess.h> -#include <asm/pgalloc.h> - -rwlock_t vmlist_lock = RW_LOCK_UNLOCKED; -struct vm_struct * vmlist; - -static inline void free_area_pte(pmd_t * pmd, unsigned long address, unsigned long size) -{ - pte_t * pte; - unsigned long end; - - if (pmd_none(*pmd)) - return; - if (pmd_bad(*pmd)) { - pmd_ERROR(*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 page; - page = ptep_get_and_clear(pte); - address += PAGE_SIZE; - pte++; - if (pte_none(page)) - continue; - if (pte_present(page)) { - struct page *ptpage = pte_page(page); -#if defined(CONFIG_XEN_PRIVILEGED_GUEST) - if (pte_io(page)) - continue; -#endif - if (VALID_PAGE(ptpage) && (!PageReserved(ptpage))) - __free_page(ptpage); - continue; - } - printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n"); - } while (address < end); -} - -static inline void free_area_pmd(pgd_t * dir, unsigned long address, unsigned long size) -{ - pmd_t * pmd; - unsigned long end; - - if (pgd_none(*dir)) - return; - if (pgd_bad(*dir)) { - pgd_ERROR(*dir); - pgd_clear(dir); - return; - } - pmd = pmd_offset(dir, address); - address &= ~PGDIR_MASK; - end = address + size; - if (end > PGDIR_SIZE) - end = PGDIR_SIZE; - do { - free_area_pte(pmd, address, end - address); - address = (address + PMD_SIZE) & PMD_MASK; - pmd++; - } while (address < end); -} - -void vmfree_area_pages(unsigned long address, unsigned long size) -{ - pgd_t * dir; - unsigned long end = address + size; - - dir = pgd_offset_k(address); - flush_cache_all(); - do { - free_area_pmd(dir, address, end - address); - address = (address + PGDIR_SIZE) & PGDIR_MASK; - dir++; - } while (address && (address < end)); - flush_tlb_all(); -} - -static inline int alloc_area_pte (pte_t * pte, unsigned long address, - unsigned long size, int gfp_mask, - pgprot_t prot, struct page ***pages) -{ - unsigned long end; - - address &= ~PMD_MASK; - end = address + size; - if (end > PMD_SIZE) - end = PMD_SIZE; - do { - struct page * page; - - if (!pages) { - spin_unlock(&init_mm.page_table_lock); - page = alloc_page(gfp_mask); - spin_lock(&init_mm.page_table_lock); - } else { - page = (**pages); - (*pages)++; - - /* Add a reference to the page so we can free later */ - if (page) - atomic_inc(&page->count); - - } - if (!pte_none(*pte)) - printk(KERN_ERR "alloc_area_pte: page already exists\n"); - if (!page) - return -ENOMEM; - set_pte(pte, mk_pte(page, prot)); - address += PAGE_SIZE; - pte++; - } while (address < end); - return 0; -} - -static inline int alloc_area_pmd(pmd_t * pmd, unsigned long address, - unsigned long size, int gfp_mask, - pgprot_t prot, struct page ***pages) -{ - unsigned long end; - - address &= ~PGDIR_MASK; - end = address + size; - if (end > PGDIR_SIZE) - end = PGDIR_SIZE; - do { - pte_t * pte = pte_alloc(&init_mm, pmd, address); - if (!pte) - return -ENOMEM; - if (alloc_area_pte(pte, address, end - address, - gfp_mask, prot, pages)) - return -ENOMEM; - address = (address + PMD_SIZE) & PMD_MASK; - pmd++; - } while (address < end); - return 0; -} - -static inline int __vmalloc_area_pages (unsigned long address, - unsigned long size, - int gfp_mask, - pgprot_t prot, - struct page ***pages) -{ - pgd_t * dir; - unsigned long start = address; - unsigned long end = address + size; - - dir = pgd_offset_k(address); - spin_lock(&init_mm.page_table_lock); - do { - pmd_t *pmd; - - pmd = pmd_alloc(&init_mm, dir, address); - if (!pmd) - goto err; - - if (alloc_area_pmd(pmd, address, end - address, gfp_mask, prot, pages)) - goto err; // The kernel NEVER reclaims pmds, so no need to undo pmd_alloc() here - - address = (address + PGDIR_SIZE) & PGDIR_MASK; - dir++; - } while (address && (address < end)); - spin_unlock(&init_mm.page_table_lock); - flush_cache_all(); - return 0; -err: - spin_unlock(&init_mm.page_table_lock); - flush_cache_all(); - if (address > start) - vmfree_area_pages(start, address - start); - return -ENOMEM; -} - -int vmalloc_area_pages(unsigned long address, unsigned long size, - int gfp_mask, pgprot_t prot) -{ - return __vmalloc_area_pages(address, size, gfp_mask, prot, NULL); -} - -struct vm_struct * get_vm_area(unsigned long size, unsigned long flags) -{ - unsigned long addr, next; - struct vm_struct **p, *tmp, *area; - - area = (struct vm_struct *) kmalloc(sizeof(*area), GFP_KERNEL); - if (!area) - return NULL; - - size += PAGE_SIZE; - if (!size) { - kfree (area); - return NULL; - } - - addr = VMALLOC_START; - write_lock(&vmlist_lock); - for (p = &vmlist; (tmp = *p) ; p = &tmp->next) { - if ((size + addr) < addr) - goto out; - if (size + addr <= (unsigned long) tmp->addr) - break; - next = tmp->size + (unsigned long) tmp->addr; - if (next > addr) - addr = next; - if (addr > VMALLOC_END-size) - goto out; - } - area->flags = flags; - area->addr = (void *)addr; - area->size = size; - area->next = *p; - *p = area; - write_unlock(&vmlist_lock); - return area; - -out: - write_unlock(&vmlist_lock); - kfree(area); - return NULL; -} - -void __vfree(void * addr, int free_area_pages) -{ - struct vm_struct **p, *tmp; - - if (!addr) - return; - if ((PAGE_SIZE-1) & (unsigned long) addr) { - printk(KERN_ERR "Trying to vfree() bad address (%p)\n", addr); - return; - } - write_lock(&vmlist_lock); - for (p = &vmlist ; (tmp = *p) ; p = &tmp->next) { - if (tmp->addr == addr) { - *p = tmp->next; - if (free_area_pages) - vmfree_area_pages(VMALLOC_VMADDR(tmp->addr), tmp->size); - write_unlock(&vmlist_lock); - kfree(tmp); - return; - } - } - write_unlock(&vmlist_lock); - printk(KERN_ERR "Trying to vfree() nonexistent vm area (%p)\n", addr); -} - -void vfree(void * addr) -{ - __vfree(addr,1); -} - -void * __vmalloc (unsigned long size, int gfp_mask, pgprot_t prot) -{ - void * addr; - struct vm_struct *area; - - size = PAGE_ALIGN(size); - if (!size || (size >> PAGE_SHIFT) > num_physpages) - return NULL; - area = get_vm_area(size, VM_ALLOC); - if (!area) - return NULL; - addr = area->addr; - if (__vmalloc_area_pages(VMALLOC_VMADDR(addr), size, gfp_mask, - prot, NULL)) { - __vfree(addr, 0); - return NULL; - } - return addr; -} - -void * vmap(struct page **pages, int count, - unsigned long flags, pgprot_t prot) -{ - void * addr; - struct vm_struct *area; - unsigned long size = count << PAGE_SHIFT; - - if (!size || size > (max_mapnr << PAGE_SHIFT)) - return NULL; - area = get_vm_area(size, flags); - if (!area) { - return NULL; - } - addr = area->addr; - if (__vmalloc_area_pages(VMALLOC_VMADDR(addr), size, 0, - prot, &pages)) { - __vfree(addr, 0); - return NULL; - } - return addr; -} - -long vread(char *buf, char *addr, unsigned long count) -{ - struct vm_struct *tmp; - char *vaddr, *buf_start = buf; - unsigned long n; - - /* Don't allow overflow */ - if ((unsigned long) addr + count < count) - count = -(unsigned long) addr; - - read_lock(&vmlist_lock); - for (tmp = vmlist; tmp; tmp = tmp->next) { - vaddr = (char *) tmp->addr; - if (addr >= vaddr + tmp->size - PAGE_SIZE) - continue; - while (addr < vaddr) { - if (count == 0) - goto finished; - *buf = '\0'; - buf++; - addr++; - count--; - } - n = vaddr + tmp->size - PAGE_SIZE - addr; - do { - if (count == 0) - goto finished; - *buf = *addr; - buf++; - addr++; - count--; - } while (--n > 0); - } -finished: - read_unlock(&vmlist_lock); - return buf - buf_start; -} - -long vwrite(char *buf, char *addr, unsigned long count) -{ - struct vm_struct *tmp; - char *vaddr, *buf_start = buf; - unsigned long n; - - /* Don't allow overflow */ - if ((unsigned long) addr + count < count) - count = -(unsigned long) addr; - - read_lock(&vmlist_lock); - for (tmp = vmlist; tmp; tmp = tmp->next) { - vaddr = (char *) tmp->addr; - if (addr >= vaddr + tmp->size - PAGE_SIZE) - continue; - while (addr < vaddr) { - if (count == 0) - goto finished; - buf++; - addr++; - count--; - } - n = vaddr + tmp->size - PAGE_SIZE - addr; - do { - if (count == 0) - goto finished; - *addr = *buf; - buf++; - addr++; - count--; - } while (--n > 0); - } -finished: - read_unlock(&vmlist_lock); - return buf - buf_start; -} |