1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
12 #include <as-layout.h>
18 static int physmem_fd = -1;
50 		if (err == -ENOMEM)  in map_memory()
53 			       "memory size>/4096\n");  in map_memory()
60  * setup_physmem() - Setup physical memory for UML
61  * @start:	Start address of the physical kernel memory,
63  * @reserve_end:	end address of the physical kernel memory.
64  * @len:	Length of total physical memory that should be mapped/made
68  * Creates an unlinked temporary file of size (len + highmem) and memory maps
71  * The offset is needed as the length of the total physical memory
72  * (len + highmem) includes the size of the memory used be the executable image,
73  * but the mapped-to address is the last address of the executable image
76  * The memory mapped memory of the temporary file is used as backing memory
82 	unsigned long reserve = reserve_end - start;  in setup_physmem()
83 	unsigned long map_size = len - reserve;  in setup_physmem()
87 		os_warn("Too few physical memory! Needed=%lu, given=%lu\n",  in setup_physmem()
97 		os_warn("setup_physmem - mapping %lu bytes of memory at 0x%p "  in setup_physmem()
98 			"failed - errno = %d\n", map_size,  in setup_physmem()
104 	 * Special kludge - This page will be mapped in to userspace processes  in setup_physmem()
120 	int fd = -1;  in phys_mapping()
127 		struct iomem_region *region = iomem_regions;  in phys_mapping()  local
129 		while (region != NULL) {  in phys_mapping()
130 			if ((phys >= region->phys) &&  in phys_mapping()
131 			    (phys < region->phys + region->size)) {  in phys_mapping()
132 				fd = region->fd;  in phys_mapping()
133 				*offset_out = phys - region->phys;  in phys_mapping()
136 			region = region->next;  in phys_mapping()
141 		*offset_out = phys - iomem_size;  in phys_mapping()
156 "    This controls how much \"physical\" memory the kernel allocates\n"
159 "    This is not related to the amount of memory in the host.  It can\n"
168 "    Configure <file> as an IO memory region named <name>.\n\n"
183 	struct iomem_region *region = iomem_regions;  in find_iomem()  local
185 	while (region != NULL) {  in find_iomem()
186 		if (!strcmp(region->driver, driver)) {  in find_iomem()
187 			*len_out = region->size;  in find_iomem()
188 			return region->virt;  in find_iomem()
191 		region = region->next;  in find_iomem()
200 	struct iomem_region *region = iomem_regions;  in setup_iomem()  local
204 	while (region != NULL) {  in setup_iomem()
205 		err = os_map_memory((void *) iomem_start, region->fd, 0,  in setup_iomem()
206 				    region->size, 1, 1, 0);  in setup_iomem()
208 			printk(KERN_ERR "Mapping iomem region for driver '%s' "  in setup_iomem()
209 			       "failed, errno = %d\n", region->driver, -err);  in setup_iomem()
211 			region->virt = iomem_start;  in setup_iomem()
212 			region->phys = __pa(region->virt);  in setup_iomem()
215 		iomem_start += region->size + PAGE_SIZE;  in setup_iomem()
216 		region = region->next;  in setup_iomem()