/* * 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) { printf("setup_physmem - mapping %ld bytes of memory at 0x%p " "failed - errno = %d\n", len - offset, (void *) uml_reserved, err); 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, unsigned long long *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);