| /* |
| * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
| * Licensed under the GPL |
| */ |
| |
| #include "linux/bootmem.h" |
| #include "linux/mm.h" |
| #include "linux/pfn.h" |
| #include "asm/page.h" |
| #include "as-layout.h" |
| #include "init.h" |
| #include "kern.h" |
| #include "mem_user.h" |
| #include "os.h" |
| |
| static int physmem_fd = -1; |
| |
| /* Changed during early boot */ |
| unsigned long high_physmem; |
| |
| extern unsigned long long physmem_size; |
| |
| int __init 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; |
| |
| 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 = host_task_size - 1024 * 1024; |
| 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(KERN_ERR "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 __init 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, 1); |
| 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) |
| { |
| int fd = -1; |
| |
| 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" |
| ); |
| |
| extern int __init parse_iomem(char *str, int *add); |
| |
| __uml_setup("iomem=", parse_iomem, |
| "iomem=<name>,<file>\n" |
| " Configure <file> as an IO memory region named <name>.\n\n" |
| ); |
| |
| /* |
| * This list is constructed in parse_iomem and addresses filled in in |
| * setup_iomem, both of which run during early boot. Afterwards, it's |
| * unchanged. |
| */ |
| struct iomem_region *iomem_regions = NULL; |
| |
| /* Initialized in parse_iomem */ |
| int iomem_size = 0; |
| |
| 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(KERN_ERR "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); |