1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
12 #include <as-layout.h>
19 static int physmem_fd = -1;
46 		if (err == -ENOMEM)  in map_memory()
49 			       "memory size>/4096\n");  in map_memory()
56  * setup_physmem() - Setup physical memory for UML
57  * @start:	Start address of the physical kernel memory,
59  * @reserve_end:	end address of the physical kernel memory.
60  * @len:	Length of total physical memory that should be mapped/made
63  * Creates an unlinked temporary file of size (len) and memory maps
66  * The offset is needed as the length of the total physical memory
67  * (len) includes the size of the memory used be the executable image,
68  * but the mapped-to address is the last address of the executable image
71  * The memory mapped memory of the temporary file is used as backing memory
77 	unsigned long reserve = reserve_end - start;  in setup_physmem()
78 	unsigned long map_size = len - reserve;  in setup_physmem()
82 		os_warn("Too few physical memory! Needed=%lu, given=%lu\n",  in setup_physmem()
92 		os_warn("setup_physmem - mapping %lu bytes of memory at 0x%p "  in setup_physmem()
93 			"failed - errno = %d\n", map_size,  in setup_physmem()
99 	 * Special kludge - This page will be mapped in to userspace processes  in setup_physmem()
114 	int fd = -1;  in phys_mapping()
124 			if ((phys >= region->phys) &&  in phys_mapping()
125 			    (phys < region->phys + region->size)) {  in phys_mapping()
126 				fd = region->fd;  in phys_mapping()
127 				*offset_out = phys - region->phys;  in phys_mapping()
130 			region = region->next;  in phys_mapping()
148 "    This controls how much \"physical\" memory the kernel allocates\n"
151 "    This is not related to the amount of memory in the host.  It can\n"
158 "    Configure <file> as an IO memory region named <name>.\n\n"
176 		if (!strcmp(region->driver, driver)) {  in find_iomem()
177 			*len_out = region->size;  in find_iomem()
178 			return region->virt;  in find_iomem()
181 		region = region->next;  in find_iomem()
195 		err = os_map_memory((void *) iomem_start, region->fd, 0,  in setup_iomem()
196 				    region->size, 1, 1, 0);  in setup_iomem()
199 			       "failed, errno = %d\n", region->driver, -err);  in setup_iomem()
201 			region->virt = iomem_start;  in setup_iomem()
202 			region->phys = __pa(region->virt);  in setup_iomem()
205 		iomem_start += region->size + PAGE_SIZE;  in setup_iomem()
206 		region = region->next;  in setup_iomem()