11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com) 31da177e4SLinus Torvalds * Licensed under the GPL 41da177e4SLinus Torvalds */ 51da177e4SLinus Torvalds 61da177e4SLinus Torvalds #include "linux/mm.h" 71da177e4SLinus Torvalds #include "linux/rbtree.h" 81da177e4SLinus Torvalds #include "linux/slab.h" 91da177e4SLinus Torvalds #include "linux/vmalloc.h" 101da177e4SLinus Torvalds #include "linux/bootmem.h" 111da177e4SLinus Torvalds #include "linux/module.h" 121da177e4SLinus Torvalds #include "asm/types.h" 131da177e4SLinus Torvalds #include "asm/pgtable.h" 141da177e4SLinus Torvalds #include "kern_util.h" 151da177e4SLinus Torvalds #include "user_util.h" 161da177e4SLinus Torvalds #include "mode_kern.h" 171da177e4SLinus Torvalds #include "mem.h" 181da177e4SLinus Torvalds #include "mem_user.h" 191da177e4SLinus Torvalds #include "os.h" 201da177e4SLinus Torvalds #include "kern.h" 211da177e4SLinus Torvalds #include "init.h" 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds struct phys_desc { 241da177e4SLinus Torvalds struct rb_node rb; 251da177e4SLinus Torvalds int fd; 261da177e4SLinus Torvalds __u64 offset; 271da177e4SLinus Torvalds void *virt; 281da177e4SLinus Torvalds unsigned long phys; 291da177e4SLinus Torvalds struct list_head list; 301da177e4SLinus Torvalds }; 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds static struct rb_root phys_mappings = RB_ROOT; 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds static struct rb_node **find_rb(void *virt) 351da177e4SLinus Torvalds { 361da177e4SLinus Torvalds struct rb_node **n = &phys_mappings.rb_node; 371da177e4SLinus Torvalds struct phys_desc *d; 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds while(*n != NULL){ 401da177e4SLinus Torvalds d = rb_entry(*n, struct phys_desc, rb); 411da177e4SLinus Torvalds if(d->virt == virt) 421da177e4SLinus Torvalds return(n); 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds if(d->virt > virt) 451da177e4SLinus Torvalds n = &(*n)->rb_left; 461da177e4SLinus Torvalds else 471da177e4SLinus Torvalds n = &(*n)->rb_right; 481da177e4SLinus Torvalds } 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds return(n); 511da177e4SLinus Torvalds } 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds static struct phys_desc *find_phys_mapping(void *virt) 541da177e4SLinus Torvalds { 551da177e4SLinus Torvalds struct rb_node **n = find_rb(virt); 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds if(*n == NULL) 581da177e4SLinus Torvalds return(NULL); 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds return(rb_entry(*n, struct phys_desc, rb)); 611da177e4SLinus Torvalds } 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds static void insert_phys_mapping(struct phys_desc *desc) 641da177e4SLinus Torvalds { 651da177e4SLinus Torvalds struct rb_node **n = find_rb(desc->virt); 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds if(*n != NULL) 681da177e4SLinus Torvalds panic("Physical remapping for %p already present", 691da177e4SLinus Torvalds desc->virt); 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds rb_link_node(&desc->rb, (*n)->rb_parent, n); 721da177e4SLinus Torvalds rb_insert_color(&desc->rb, &phys_mappings); 731da177e4SLinus Torvalds } 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds LIST_HEAD(descriptor_mappings); 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds struct desc_mapping { 781da177e4SLinus Torvalds int fd; 791da177e4SLinus Torvalds struct list_head list; 801da177e4SLinus Torvalds struct list_head pages; 811da177e4SLinus Torvalds }; 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds static struct desc_mapping *find_mapping(int fd) 841da177e4SLinus Torvalds { 851da177e4SLinus Torvalds struct desc_mapping *desc; 861da177e4SLinus Torvalds struct list_head *ele; 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds list_for_each(ele, &descriptor_mappings){ 891da177e4SLinus Torvalds desc = list_entry(ele, struct desc_mapping, list); 901da177e4SLinus Torvalds if(desc->fd == fd) 911da177e4SLinus Torvalds return(desc); 921da177e4SLinus Torvalds } 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds return(NULL); 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds static struct desc_mapping *descriptor_mapping(int fd) 981da177e4SLinus Torvalds { 991da177e4SLinus Torvalds struct desc_mapping *desc; 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds desc = find_mapping(fd); 1021da177e4SLinus Torvalds if(desc != NULL) 1031da177e4SLinus Torvalds return(desc); 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds desc = kmalloc(sizeof(*desc), GFP_ATOMIC); 1061da177e4SLinus Torvalds if(desc == NULL) 1071da177e4SLinus Torvalds return(NULL); 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds *desc = ((struct desc_mapping) 1101da177e4SLinus Torvalds { .fd = fd, 1111da177e4SLinus Torvalds .list = LIST_HEAD_INIT(desc->list), 1121da177e4SLinus Torvalds .pages = LIST_HEAD_INIT(desc->pages) }); 1131da177e4SLinus Torvalds list_add(&desc->list, &descriptor_mappings); 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds return(desc); 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds int physmem_subst_mapping(void *virt, int fd, __u64 offset, int w) 1191da177e4SLinus Torvalds { 1201da177e4SLinus Torvalds struct desc_mapping *fd_maps; 1211da177e4SLinus Torvalds struct phys_desc *desc; 1221da177e4SLinus Torvalds unsigned long phys; 1231da177e4SLinus Torvalds int err; 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds fd_maps = descriptor_mapping(fd); 1261da177e4SLinus Torvalds if(fd_maps == NULL) 1271da177e4SLinus Torvalds return(-ENOMEM); 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds phys = __pa(virt); 1301da177e4SLinus Torvalds desc = find_phys_mapping(virt); 1311da177e4SLinus Torvalds if(desc != NULL) 1321da177e4SLinus Torvalds panic("Address 0x%p is already substituted\n", virt); 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds err = -ENOMEM; 1351da177e4SLinus Torvalds desc = kmalloc(sizeof(*desc), GFP_ATOMIC); 1361da177e4SLinus Torvalds if(desc == NULL) 1371da177e4SLinus Torvalds goto out; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds *desc = ((struct phys_desc) 1401da177e4SLinus Torvalds { .fd = fd, 1411da177e4SLinus Torvalds .offset = offset, 1421da177e4SLinus Torvalds .virt = virt, 1431da177e4SLinus Torvalds .phys = __pa(virt), 1441da177e4SLinus Torvalds .list = LIST_HEAD_INIT(desc->list) }); 1451da177e4SLinus Torvalds insert_phys_mapping(desc); 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds list_add(&desc->list, &fd_maps->pages); 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds virt = (void *) ((unsigned long) virt & PAGE_MASK); 1501da177e4SLinus Torvalds err = os_map_memory(virt, fd, offset, PAGE_SIZE, 1, w, 0); 1511da177e4SLinus Torvalds if(!err) 1521da177e4SLinus Torvalds goto out; 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds rb_erase(&desc->rb, &phys_mappings); 1551da177e4SLinus Torvalds kfree(desc); 1561da177e4SLinus Torvalds out: 1571da177e4SLinus Torvalds return(err); 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds static int physmem_fd = -1; 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds static void remove_mapping(struct phys_desc *desc) 1631da177e4SLinus Torvalds { 1641da177e4SLinus Torvalds void *virt = desc->virt; 1651da177e4SLinus Torvalds int err; 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds rb_erase(&desc->rb, &phys_mappings); 1681da177e4SLinus Torvalds list_del(&desc->list); 1691da177e4SLinus Torvalds kfree(desc); 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds err = os_map_memory(virt, physmem_fd, __pa(virt), PAGE_SIZE, 1, 1, 0); 1721da177e4SLinus Torvalds if(err) 1731da177e4SLinus Torvalds panic("Failed to unmap block device page from physical memory, " 1741da177e4SLinus Torvalds "errno = %d", -err); 1751da177e4SLinus Torvalds } 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds int physmem_remove_mapping(void *virt) 1781da177e4SLinus Torvalds { 1791da177e4SLinus Torvalds struct phys_desc *desc; 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds virt = (void *) ((unsigned long) virt & PAGE_MASK); 1821da177e4SLinus Torvalds desc = find_phys_mapping(virt); 1831da177e4SLinus Torvalds if(desc == NULL) 1841da177e4SLinus Torvalds return(0); 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds remove_mapping(desc); 1871da177e4SLinus Torvalds return(1); 1881da177e4SLinus Torvalds } 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds void physmem_forget_descriptor(int fd) 1911da177e4SLinus Torvalds { 1921da177e4SLinus Torvalds struct desc_mapping *desc; 1931da177e4SLinus Torvalds struct phys_desc *page; 1941da177e4SLinus Torvalds struct list_head *ele, *next; 1951da177e4SLinus Torvalds __u64 offset; 1961da177e4SLinus Torvalds void *addr; 1971da177e4SLinus Torvalds int err; 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds desc = find_mapping(fd); 2001da177e4SLinus Torvalds if(desc == NULL) 2011da177e4SLinus Torvalds return; 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds list_for_each_safe(ele, next, &desc->pages){ 2041da177e4SLinus Torvalds page = list_entry(ele, struct phys_desc, list); 2051da177e4SLinus Torvalds offset = page->offset; 2061da177e4SLinus Torvalds addr = page->virt; 2071da177e4SLinus Torvalds remove_mapping(page); 2081da177e4SLinus Torvalds err = os_seek_file(fd, offset); 2091da177e4SLinus Torvalds if(err) 2101da177e4SLinus Torvalds panic("physmem_forget_descriptor - failed to seek " 2111da177e4SLinus Torvalds "to %lld in fd %d, error = %d\n", 2121da177e4SLinus Torvalds offset, fd, -err); 2131da177e4SLinus Torvalds err = os_read_file(fd, addr, PAGE_SIZE); 2141da177e4SLinus Torvalds if(err < 0) 2151da177e4SLinus Torvalds panic("physmem_forget_descriptor - failed to read " 2161da177e4SLinus Torvalds "from fd %d to 0x%p, error = %d\n", 2171da177e4SLinus Torvalds fd, addr, -err); 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds list_del(&desc->list); 2211da177e4SLinus Torvalds kfree(desc); 2221da177e4SLinus Torvalds } 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds EXPORT_SYMBOL(physmem_forget_descriptor); 2251da177e4SLinus Torvalds EXPORT_SYMBOL(physmem_remove_mapping); 2261da177e4SLinus Torvalds EXPORT_SYMBOL(physmem_subst_mapping); 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds void arch_free_page(struct page *page, int order) 2291da177e4SLinus Torvalds { 2301da177e4SLinus Torvalds void *virt; 2311da177e4SLinus Torvalds int i; 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds for(i = 0; i < (1 << order); i++){ 2341da177e4SLinus Torvalds virt = __va(page_to_phys(page + i)); 2351da177e4SLinus Torvalds physmem_remove_mapping(virt); 2361da177e4SLinus Torvalds } 2371da177e4SLinus Torvalds } 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds int is_remapped(void *virt) 2401da177e4SLinus Torvalds { 2411da177e4SLinus Torvalds struct phys_desc *desc = find_phys_mapping(virt); 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds return(desc != NULL); 2441da177e4SLinus Torvalds } 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds /* Changed during early boot */ 2471da177e4SLinus Torvalds unsigned long high_physmem; 2481da177e4SLinus Torvalds 249ae173816SJeff Dike extern unsigned long long physmem_size; 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds int init_maps(unsigned long physmem, unsigned long iomem, unsigned long highmem) 2521da177e4SLinus Torvalds { 2531da177e4SLinus Torvalds struct page *p, *map; 2541da177e4SLinus Torvalds unsigned long phys_len, phys_pages, highmem_len, highmem_pages; 2551da177e4SLinus Torvalds unsigned long iomem_len, iomem_pages, total_len, total_pages; 2561da177e4SLinus Torvalds int i; 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds phys_pages = physmem >> PAGE_SHIFT; 2591da177e4SLinus Torvalds phys_len = phys_pages * sizeof(struct page); 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds iomem_pages = iomem >> PAGE_SHIFT; 2621da177e4SLinus Torvalds iomem_len = iomem_pages * sizeof(struct page); 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds highmem_pages = highmem >> PAGE_SHIFT; 2651da177e4SLinus Torvalds highmem_len = highmem_pages * sizeof(struct page); 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds total_pages = phys_pages + iomem_pages + highmem_pages; 2681da177e4SLinus Torvalds total_len = phys_len + iomem_pages + highmem_len; 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds if(kmalloc_ok){ 2711da177e4SLinus Torvalds map = kmalloc(total_len, GFP_KERNEL); 2721da177e4SLinus Torvalds if(map == NULL) 2731da177e4SLinus Torvalds map = vmalloc(total_len); 2741da177e4SLinus Torvalds } 2751da177e4SLinus Torvalds else map = alloc_bootmem_low_pages(total_len); 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds if(map == NULL) 2781da177e4SLinus Torvalds return(-ENOMEM); 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds for(i = 0; i < total_pages; i++){ 2811da177e4SLinus Torvalds p = &map[i]; 2821da177e4SLinus Torvalds set_page_count(p, 0); 2831da177e4SLinus Torvalds SetPageReserved(p); 2841da177e4SLinus Torvalds INIT_LIST_HEAD(&p->lru); 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds max_mapnr = total_pages; 2881da177e4SLinus Torvalds return(0); 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds /* Changed during early boot */ 2921da177e4SLinus Torvalds static unsigned long kmem_top = 0; 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds unsigned long get_kmem_end(void) 2951da177e4SLinus Torvalds { 2961da177e4SLinus Torvalds if(kmem_top == 0) 2971da177e4SLinus Torvalds kmem_top = CHOOSE_MODE(kmem_end_tt, kmem_end_skas); 2981da177e4SLinus Torvalds return(kmem_top); 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds void map_memory(unsigned long virt, unsigned long phys, unsigned long len, 3021da177e4SLinus Torvalds int r, int w, int x) 3031da177e4SLinus Torvalds { 3041da177e4SLinus Torvalds __u64 offset; 3051da177e4SLinus Torvalds int fd, err; 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds fd = phys_mapping(phys, &offset); 3081da177e4SLinus Torvalds err = os_map_memory((void *) virt, fd, offset, len, r, w, x); 3091da177e4SLinus Torvalds if(err) { 3101da177e4SLinus Torvalds if(err == -ENOMEM) 3111da177e4SLinus Torvalds printk("try increasing the host's " 3121da177e4SLinus Torvalds "/proc/sys/vm/max_map_count to <physical " 3131da177e4SLinus Torvalds "memory size>/4096\n"); 3141da177e4SLinus Torvalds panic("map_memory(0x%lx, %d, 0x%llx, %ld, %d, %d, %d) failed, " 3151da177e4SLinus Torvalds "err = %d\n", virt, fd, offset, len, r, w, x, err); 3161da177e4SLinus Torvalds } 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds #define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT) 3201da177e4SLinus Torvalds 321d67b569fSJeff Dike extern int __syscall_stub_start, __binary_start; 322d67b569fSJeff Dike 3231da177e4SLinus Torvalds void setup_physmem(unsigned long start, unsigned long reserve_end, 324ae173816SJeff Dike unsigned long len, unsigned long long highmem) 3251da177e4SLinus Torvalds { 3261da177e4SLinus Torvalds unsigned long reserve = reserve_end - start; 3271da177e4SLinus Torvalds int pfn = PFN_UP(__pa(reserve_end)); 3281da177e4SLinus Torvalds int delta = (len - reserve) >> PAGE_SHIFT; 3291da177e4SLinus Torvalds int err, offset, bootmap_size; 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds physmem_fd = create_mem_file(len + highmem); 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds offset = uml_reserved - uml_physmem; 3341da177e4SLinus Torvalds err = os_map_memory((void *) uml_reserved, physmem_fd, offset, 3351da177e4SLinus Torvalds len - offset, 1, 1, 0); 3361da177e4SLinus Torvalds if(err < 0){ 3371da177e4SLinus Torvalds os_print_error(err, "Mapping memory"); 3381da177e4SLinus Torvalds exit(1); 3391da177e4SLinus Torvalds } 3401da177e4SLinus Torvalds 341d67b569fSJeff Dike /* Special kludge - This page will be mapped in to userspace processes 342d67b569fSJeff Dike * from physmem_fd, so it needs to be written out there. 343d67b569fSJeff Dike */ 344d67b569fSJeff Dike os_seek_file(physmem_fd, __pa(&__syscall_stub_start)); 345d67b569fSJeff Dike os_write_file(physmem_fd, &__syscall_stub_start, PAGE_SIZE); 346d67b569fSJeff Dike 3471da177e4SLinus Torvalds bootmap_size = init_bootmem(pfn, pfn + delta); 3481da177e4SLinus Torvalds free_bootmem(__pa(reserve_end) + bootmap_size, 3491da177e4SLinus Torvalds len - bootmap_size - reserve); 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds int phys_mapping(unsigned long phys, __u64 *offset_out) 3531da177e4SLinus Torvalds { 3541da177e4SLinus Torvalds struct phys_desc *desc = find_phys_mapping(__va(phys & PAGE_MASK)); 3551da177e4SLinus Torvalds int fd = -1; 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds if(desc != NULL){ 3581da177e4SLinus Torvalds fd = desc->fd; 3591da177e4SLinus Torvalds *offset_out = desc->offset; 3601da177e4SLinus Torvalds } 3611da177e4SLinus Torvalds else if(phys < physmem_size){ 3621da177e4SLinus Torvalds fd = physmem_fd; 3631da177e4SLinus Torvalds *offset_out = phys; 3641da177e4SLinus Torvalds } 3651da177e4SLinus Torvalds else if(phys < __pa(end_iomem)){ 3661da177e4SLinus Torvalds struct iomem_region *region = iomem_regions; 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds while(region != NULL){ 3691da177e4SLinus Torvalds if((phys >= region->phys) && 3701da177e4SLinus Torvalds (phys < region->phys + region->size)){ 3711da177e4SLinus Torvalds fd = region->fd; 3721da177e4SLinus Torvalds *offset_out = phys - region->phys; 3731da177e4SLinus Torvalds break; 3741da177e4SLinus Torvalds } 3751da177e4SLinus Torvalds region = region->next; 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds } 3781da177e4SLinus Torvalds else if(phys < __pa(end_iomem) + highmem){ 3791da177e4SLinus Torvalds fd = physmem_fd; 3801da177e4SLinus Torvalds *offset_out = phys - iomem_size; 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds return(fd); 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds static int __init uml_mem_setup(char *line, int *add) 3871da177e4SLinus Torvalds { 3881da177e4SLinus Torvalds char *retptr; 3891da177e4SLinus Torvalds physmem_size = memparse(line,&retptr); 3901da177e4SLinus Torvalds return 0; 3911da177e4SLinus Torvalds } 3921da177e4SLinus Torvalds __uml_setup("mem=", uml_mem_setup, 3931da177e4SLinus Torvalds "mem=<Amount of desired ram>\n" 3941da177e4SLinus Torvalds " This controls how much \"physical\" memory the kernel allocates\n" 3951da177e4SLinus Torvalds " for the system. The size is specified as a number followed by\n" 3961da177e4SLinus Torvalds " one of 'k', 'K', 'm', 'M', which have the obvious meanings.\n" 3971da177e4SLinus Torvalds " This is not related to the amount of memory in the host. It can\n" 3981da177e4SLinus Torvalds " be more, and the excess, if it's ever used, will just be swapped out.\n" 3991da177e4SLinus Torvalds " Example: mem=64M\n\n" 4001da177e4SLinus Torvalds ); 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds unsigned long find_iomem(char *driver, unsigned long *len_out) 4031da177e4SLinus Torvalds { 4041da177e4SLinus Torvalds struct iomem_region *region = iomem_regions; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds while(region != NULL){ 4071da177e4SLinus Torvalds if(!strcmp(region->driver, driver)){ 4081da177e4SLinus Torvalds *len_out = region->size; 4091da177e4SLinus Torvalds return(region->virt); 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds return(0); 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds int setup_iomem(void) 4171da177e4SLinus Torvalds { 4181da177e4SLinus Torvalds struct iomem_region *region = iomem_regions; 4191da177e4SLinus Torvalds unsigned long iomem_start = high_physmem + PAGE_SIZE; 4201da177e4SLinus Torvalds int err; 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds while(region != NULL){ 4231da177e4SLinus Torvalds err = os_map_memory((void *) iomem_start, region->fd, 0, 4241da177e4SLinus Torvalds region->size, 1, 1, 0); 4251da177e4SLinus Torvalds if(err) 4261da177e4SLinus Torvalds printk("Mapping iomem region for driver '%s' failed, " 4271da177e4SLinus Torvalds "errno = %d\n", region->driver, -err); 4281da177e4SLinus Torvalds else { 4291da177e4SLinus Torvalds region->virt = iomem_start; 4301da177e4SLinus Torvalds region->phys = __pa(region->virt); 4311da177e4SLinus Torvalds } 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds iomem_start += region->size + PAGE_SIZE; 4341da177e4SLinus Torvalds region = region->next; 4351da177e4SLinus Torvalds } 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds return(0); 4381da177e4SLinus Torvalds } 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds __initcall(setup_iomem); 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds /* 4431da177e4SLinus Torvalds * Overrides for Emacs so that we follow Linus's tabbing style. 4441da177e4SLinus Torvalds * Emacs will notice this stuff at the end of the file and automatically 4451da177e4SLinus Torvalds * adjust the settings for this buffer only. This must remain at the end 4461da177e4SLinus Torvalds * of the file. 4471da177e4SLinus Torvalds * --------------------------------------------------------------------------- 4481da177e4SLinus Torvalds * Local variables: 4491da177e4SLinus Torvalds * c-file-style: "linux" 4501da177e4SLinus Torvalds * End: 4511da177e4SLinus Torvalds */ 452