diff options
Diffstat (limited to 'linux-2.6-xen-sparse/arch/um/kernel/physmem.c')
-rw-r--r-- | linux-2.6-xen-sparse/arch/um/kernel/physmem.c | 454 |
1 files changed, 0 insertions, 454 deletions
diff --git a/linux-2.6-xen-sparse/arch/um/kernel/physmem.c b/linux-2.6-xen-sparse/arch/um/kernel/physmem.c deleted file mode 100644 index 22c40d3085..0000000000 --- a/linux-2.6-xen-sparse/arch/um/kernel/physmem.c +++ /dev/null @@ -1,454 +0,0 @@ -/* - * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com) - * Licensed under the GPL - */ - -#include "linux/mm.h" -#include "linux/rbtree.h" -#include "linux/slab.h" -#include "linux/vmalloc.h" -#include "linux/bootmem.h" -#include "linux/module.h" -#include "linux/pfn.h" -#include "asm/types.h" -#include "asm/pgtable.h" -#include "kern_util.h" -#include "user_util.h" -#include "mode_kern.h" -#include "mem.h" -#include "mem_user.h" -#include "os.h" -#include "kern.h" -#include "init.h" - -struct phys_desc { - struct rb_node rb; - int fd; - __u64 offset; - void *virt; - unsigned long phys; - struct list_head list; -}; - -static struct rb_root phys_mappings = RB_ROOT; - -static struct rb_node **find_rb(void *virt) -{ - struct rb_node **n = &phys_mappings.rb_node; - struct phys_desc *d; - - while(*n != NULL){ - d = rb_entry(*n, struct phys_desc, rb); - if(d->virt == virt) - return(n); - - if(d->virt > virt) - n = &(*n)->rb_left; - else - n = &(*n)->rb_right; - } - - return(n); -} - -static struct phys_desc *find_phys_mapping(void *virt) -{ - struct rb_node **n = find_rb(virt); - - if(*n == NULL) - return(NULL); - - return(rb_entry(*n, struct phys_desc, rb)); -} - -static void insert_phys_mapping(struct phys_desc *desc) -{ - struct rb_node **n = find_rb(desc->virt); - - if(*n != NULL) - panic("Physical remapping for %p already present", - desc->virt); - - rb_link_node(&desc->rb, rb_parent(*n), n); - rb_insert_color(&desc->rb, &phys_mappings); -} - -LIST_HEAD(descriptor_mappings); - -struct desc_mapping { - int fd; - struct list_head list; - struct list_head pages; -}; - -static struct desc_mapping *find_mapping(int fd) -{ - struct desc_mapping *desc; - struct list_head *ele; - - list_for_each(ele, &descriptor_mappings){ - desc = list_entry(ele, struct desc_mapping, list); - if(desc->fd == fd) - return(desc); - } - - return(NULL); -} - -static struct desc_mapping *descriptor_mapping(int fd) -{ - struct desc_mapping *desc; - - desc = find_mapping(fd); - if(desc != NULL) - return(desc); - - desc = kmalloc(sizeof(*desc), GFP_ATOMIC); - if(desc == NULL) - return(NULL); - - *desc = ((struct desc_mapping) - { .fd = fd, - .list = LIST_HEAD_INIT(desc->list), - .pages = LIST_HEAD_INIT(desc->pages) }); - list_add(&desc->list, &descriptor_mappings); - - return(desc); -} - -int physmem_subst_mapping(void *virt, int fd, __u64 offset, int w) -{ - struct desc_mapping *fd_maps; - struct phys_desc *desc; - unsigned long phys; - int err; - - fd_maps = descriptor_mapping(fd); - if(fd_maps == NULL) - return(-ENOMEM); - - phys = __pa(virt); - desc = find_phys_mapping(virt); - if(desc != NULL) - panic("Address 0x%p is already substituted\n", virt); - - err = -ENOMEM; - desc = kmalloc(sizeof(*desc), GFP_ATOMIC); - if(desc == NULL) - goto out; - - *desc = ((struct phys_desc) - { .fd = fd, - .offset = offset, - .virt = virt, - .phys = __pa(virt), - .list = LIST_HEAD_INIT(desc->list) }); - insert_phys_mapping(desc); - - list_add(&desc->list, &fd_maps->pages); - - virt = (void *) ((unsigned long) virt & PAGE_MASK); - err = os_map_memory(virt, fd, offset, PAGE_SIZE, 1, w, 0); - if(!err) - goto out; - - rb_erase(&desc->rb, &phys_mappings); - kfree(desc); - out: - return(err); -} - -static int physmem_fd = -1; - -static void remove_mapping(struct phys_desc *desc) -{ - void *virt = desc->virt; - int err; - - rb_erase(&desc->rb, &phys_mappings); - list_del(&desc->list); - kfree(desc); - - err = os_map_memory(virt, physmem_fd, __pa(virt), PAGE_SIZE, 1, 1, 0); - if(err) - panic("Failed to unmap block device page from physical memory, " - "errno = %d", -err); -} - -int physmem_remove_mapping(void *virt) -{ - struct phys_desc *desc; - - virt = (void *) ((unsigned long) virt & PAGE_MASK); - desc = find_phys_mapping(virt); - if(desc == NULL) - return(0); - - remove_mapping(desc); - return(1); -} - -void physmem_forget_descriptor(int fd) -{ - struct desc_mapping *desc; - struct phys_desc *page; - struct list_head *ele, *next; - __u64 offset; - void *addr; - int err; - - desc = find_mapping(fd); - if(desc == NULL) - return; - - list_for_each_safe(ele, next, &desc->pages){ - page = list_entry(ele, struct phys_desc, list); - offset = page->offset; - addr = page->virt; - remove_mapping(page); - err = os_seek_file(fd, offset); - if(err) - panic("physmem_forget_descriptor - failed to seek " - "to %lld in fd %d, error = %d\n", - offset, fd, -err); - err = os_read_file(fd, addr, PAGE_SIZE); - if(err < 0) - panic("physmem_forget_descriptor - failed to read " - "from fd %d to 0x%p, error = %d\n", - fd, addr, -err); - } - - list_del(&desc->list); - kfree(desc); -} - -EXPORT_SYMBOL(physmem_forget_descriptor); -EXPORT_SYMBOL(physmem_remove_mapping); -EXPORT_SYMBOL(physmem_subst_mapping); - -int arch_free_page(struct page *page, int order) -{ - void *virt; - int i; - - for(i = 0; i < (1 << order); i++){ - virt = __va(page_to_phys(page + i)); - physmem_remove_mapping(virt); - } - - return 0; -} - -int is_remapped(void *virt) -{ - struct phys_desc *desc = find_phys_mapping(virt); - - return(desc != NULL); -} - -/* Changed during early boot */ -unsigned long high_physmem; - -extern unsigned long long physmem_size; - -int init_maps(unsigned long physmem, unsigned long iomem, unsigned long highmem) -{ - struct page *p, *map; - unsigned long phys_len, phys_pages, highmem_len, highmem_pages; - unsigned long iomem_len, iomem_pages, total_len, total_pages; - int i; - - phys_pages = physmem >> PAGE_SHIFT; - phys_len = phys_pages * sizeof(struct page); - - iomem_pages = iomem >> PAGE_SHIFT; - iomem_len = iomem_pages * sizeof(struct page); - - highmem_pages = highmem >> PAGE_SHIFT; - highmem_len = highmem_pages * sizeof(struct page); - - total_pages = phys_pages + iomem_pages + highmem_pages; - total_len = phys_len + iomem_len + highmem_len; - - if(kmalloc_ok){ - map = kmalloc(total_len, GFP_KERNEL); - if(map == NULL) - map = vmalloc(total_len); - } - else map = alloc_bootmem_low_pages(total_len); - - if(map == NULL) - return(-ENOMEM); - - for(i = 0; i < total_pages; i++){ - p = &map[i]; - memset(p, 0, sizeof(struct page)); - SetPageReserved(p); - INIT_LIST_HEAD(&p->lru); - } - - max_mapnr = total_pages; - return(0); -} - -/* Changed during early boot */ -static unsigned long kmem_top = 0; - -unsigned long get_kmem_end(void) -{ - if(kmem_top == 0) - kmem_top = CHOOSE_MODE(kmem_end_tt, kmem_end_skas); - return(kmem_top); -} - -void map_memory(unsigned long virt, unsigned long phys, unsigned long len, - int r, int w, int x) -{ - __u64 offset; - int fd, err; - - fd = phys_mapping(phys, &offset); - err = os_map_memory((void *) virt, fd, offset, len, r, w, x); - if(err) { - if(err == -ENOMEM) - printk("try increasing the host's " - "/proc/sys/vm/max_map_count to <physical " - "memory size>/4096\n"); - panic("map_memory(0x%lx, %d, 0x%llx, %ld, %d, %d, %d) failed, " - "err = %d\n", virt, fd, offset, len, r, w, x, err); - } -} - -extern int __syscall_stub_start; - -void setup_physmem(unsigned long start, unsigned long reserve_end, - unsigned long len, unsigned long long highmem) -{ - unsigned long reserve = reserve_end - start; - int pfn = PFN_UP(__pa(reserve_end)); - int delta = (len - reserve) >> PAGE_SHIFT; - int err, offset, bootmap_size; - - physmem_fd = create_mem_file(len + highmem); - - offset = uml_reserved - uml_physmem; - err = os_map_memory((void *) uml_reserved, physmem_fd, offset, - len - offset, 1, 1, 0); - if(err < 0){ - os_print_error(err, "Mapping memory"); - exit(1); - } - - /* Special kludge - This page will be mapped in to userspace processes - * from physmem_fd, so it needs to be written out there. - */ - os_seek_file(physmem_fd, __pa(&__syscall_stub_start)); - os_write_file(physmem_fd, &__syscall_stub_start, PAGE_SIZE); - - bootmap_size = init_bootmem(pfn, pfn + delta); - free_bootmem(__pa(reserve_end) + bootmap_size, - len - bootmap_size - reserve); -} - -int phys_mapping(unsigned long phys, __u64 *offset_out) -{ - struct phys_desc *desc = find_phys_mapping(__va(phys & PAGE_MASK)); - int fd = -1; - - if(desc != NULL){ - fd = desc->fd; - *offset_out = desc->offset; - } - else if(phys < physmem_size){ - fd = physmem_fd; - *offset_out = phys; - } - else if(phys < __pa(end_iomem)){ - struct iomem_region *region = iomem_regions; - - while(region != NULL){ - if((phys >= region->phys) && - (phys < region->phys + region->size)){ - fd = region->fd; - *offset_out = phys - region->phys; - break; - } - region = region->next; - } - } - else if(phys < __pa(end_iomem) + highmem){ - fd = physmem_fd; - *offset_out = phys - iomem_size; - } - - return(fd); -} - -static int __init uml_mem_setup(char *line, int *add) -{ - char *retptr; - physmem_size = memparse(line,&retptr); - return 0; -} -__uml_setup("mem=", uml_mem_setup, -"mem=<Amount of desired ram>\n" -" This controls how much \"physical\" memory the kernel allocates\n" -" for the system. The size is specified as a number followed by\n" -" one of 'k', 'K', 'm', 'M', which have the obvious meanings.\n" -" This is not related to the amount of memory in the host. It can\n" -" be more, and the excess, if it's ever used, will just be swapped out.\n" -" Example: mem=64M\n\n" -); - -unsigned long find_iomem(char *driver, unsigned long *len_out) -{ - struct iomem_region *region = iomem_regions; - - while(region != NULL){ - if(!strcmp(region->driver, driver)){ - *len_out = region->size; - return(region->virt); - } - - region = region->next; - } - - return(0); -} - -int setup_iomem(void) -{ - struct iomem_region *region = iomem_regions; - unsigned long iomem_start = high_physmem + PAGE_SIZE; - int err; - - while(region != NULL){ - err = os_map_memory((void *) iomem_start, region->fd, 0, - region->size, 1, 1, 0); - if(err) - printk("Mapping iomem region for driver '%s' failed, " - "errno = %d\n", region->driver, -err); - else { - region->virt = iomem_start; - region->phys = __pa(region->virt); - } - - iomem_start += region->size + PAGE_SIZE; - region = region->next; - } - - return(0); -} - -__initcall(setup_iomem); - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ |