2 * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
3 * Licensed under the GPL
7 #include "linux/rbtree.h"
8 #include "linux/slab.h"
9 #include "linux/vmalloc.h"
10 #include "linux/bootmem.h"
11 #include "linux/module.h"
12 #include "linux/pfn.h"
13 #include "asm/types.h"
14 #include "asm/pgtable.h"
15 #include "kern_util.h"
16 #include "as-layout.h"
17 #include "mode_kern.h"
24 static int physmem_fd = -1;
26 /* Changed during early boot */
27 unsigned long high_physmem;
29 extern unsigned long long physmem_size;
31 int __init init_maps(unsigned long physmem, unsigned long iomem,
32 unsigned long highmem)
35 unsigned long phys_len, phys_pages, highmem_len, highmem_pages;
36 unsigned long iomem_len, iomem_pages, total_len, total_pages;
39 phys_pages = physmem >> PAGE_SHIFT;
40 phys_len = phys_pages * sizeof(struct page);
42 iomem_pages = iomem >> PAGE_SHIFT;
43 iomem_len = iomem_pages * sizeof(struct page);
45 highmem_pages = highmem >> PAGE_SHIFT;
46 highmem_len = highmem_pages * sizeof(struct page);
48 total_pages = phys_pages + iomem_pages + highmem_pages;
49 total_len = phys_len + iomem_len + highmem_len;
51 map = alloc_bootmem_low_pages(total_len);
55 for(i = 0; i < total_pages; i++){
57 memset(p, 0, sizeof(struct page));
59 INIT_LIST_HEAD(&p->lru);
62 max_mapnr = total_pages;
66 /* Changed during early boot */
67 static unsigned long kmem_top = 0;
69 unsigned long get_kmem_end(void)
72 kmem_top = CHOOSE_MODE(kmem_end_tt, kmem_end_skas);
76 void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
82 fd = phys_mapping(phys, &offset);
83 err = os_map_memory((void *) virt, fd, offset, len, r, w, x);
86 printk("try increasing the host's "
87 "/proc/sys/vm/max_map_count to <physical "
88 "memory size>/4096\n");
89 panic("map_memory(0x%lx, %d, 0x%llx, %ld, %d, %d, %d) failed, "
90 "err = %d\n", virt, fd, offset, len, r, w, x, err);
94 extern int __syscall_stub_start;
96 void __init setup_physmem(unsigned long start, unsigned long reserve_end,
97 unsigned long len, unsigned long long highmem)
99 unsigned long reserve = reserve_end - start;
100 int pfn = PFN_UP(__pa(reserve_end));
101 int delta = (len - reserve) >> PAGE_SHIFT;
102 int err, offset, bootmap_size;
104 physmem_fd = create_mem_file(len + highmem);
106 offset = uml_reserved - uml_physmem;
107 err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
108 len - offset, 1, 1, 0);
110 os_print_error(err, "Mapping memory");
114 /* Special kludge - This page will be mapped in to userspace processes
115 * from physmem_fd, so it needs to be written out there.
117 os_seek_file(physmem_fd, __pa(&__syscall_stub_start));
118 os_write_file(physmem_fd, &__syscall_stub_start, PAGE_SIZE);
120 bootmap_size = init_bootmem(pfn, pfn + delta);
121 free_bootmem(__pa(reserve_end) + bootmap_size,
122 len - bootmap_size - reserve);
125 int phys_mapping(unsigned long phys, __u64 *offset_out)
129 if(phys < physmem_size){
133 else if(phys < __pa(end_iomem)){
134 struct iomem_region *region = iomem_regions;
136 while(region != NULL){
137 if((phys >= region->phys) &&
138 (phys < region->phys + region->size)){
140 *offset_out = phys - region->phys;
143 region = region->next;
146 else if(phys < __pa(end_iomem) + highmem){
148 *offset_out = phys - iomem_size;
154 static int __init uml_mem_setup(char *line, int *add)
157 physmem_size = memparse(line,&retptr);
160 __uml_setup("mem=", uml_mem_setup,
161 "mem=<Amount of desired ram>\n"
162 " This controls how much \"physical\" memory the kernel allocates\n"
163 " for the system. The size is specified as a number followed by\n"
164 " one of 'k', 'K', 'm', 'M', which have the obvious meanings.\n"
165 " This is not related to the amount of memory in the host. It can\n"
166 " be more, and the excess, if it's ever used, will just be swapped out.\n"
167 " Example: mem=64M\n\n"
170 extern int __init parse_iomem(char *str, int *add);
172 __uml_setup("iomem=", parse_iomem,
173 "iomem=<name>,<file>\n"
174 " Configure <file> as an IO memory region named <name>.\n\n"
178 * This list is constructed in parse_iomem and addresses filled in in
179 * setup_iomem, both of which run during early boot. Afterwards, it's
182 struct iomem_region *iomem_regions = NULL;
184 /* Initialized in parse_iomem */
187 unsigned long find_iomem(char *driver, unsigned long *len_out)
189 struct iomem_region *region = iomem_regions;
191 while(region != NULL){
192 if(!strcmp(region->driver, driver)){
193 *len_out = region->size;
197 region = region->next;
203 int setup_iomem(void)
205 struct iomem_region *region = iomem_regions;
206 unsigned long iomem_start = high_physmem + PAGE_SIZE;
209 while(region != NULL){
210 err = os_map_memory((void *) iomem_start, region->fd, 0,
211 region->size, 1, 1, 0);
213 printk("Mapping iomem region for driver '%s' failed, "
214 "errno = %d\n", region->driver, -err);
216 region->virt = iomem_start;
217 region->phys = __pa(region->virt);
220 iomem_start += region->size + PAGE_SIZE;
221 region = region->next;
227 __initcall(setup_iomem);