diff options
Diffstat (limited to 'kexec/arch/i386/kexec-x86-common.c')
| -rw-r--r-- | kexec/arch/i386/kexec-x86-common.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/kexec/arch/i386/kexec-x86-common.c b/kexec/arch/i386/kexec-x86-common.c new file mode 100644 index 0000000..4533425 --- /dev/null +++ b/kexec/arch/i386/kexec-x86-common.c @@ -0,0 +1,207 @@ +/* + * kexec: Linux boots Linux + * + * Copyright (C) 2003-2005 Eric Biederman (ebiederm@xmission.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation (version 2 of the License). + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <stddef.h> +#include <stdio.h> +#include <errno.h> +#include <stdint.h> +#include <string.h> +#include <limits.h> +#include <stdlib.h> +#include "../../kexec.h" +#include "../../kexec-syscall.h" +#include "../../firmware_memmap.h" +#include "kexec-x86.h" + +static struct memory_range memory_range[MAX_MEMORY_RANGES]; + +/** + * The old /proc/iomem parsing code. + * + * @param[out] range pointer that will be set to an array that holds the + * memory ranges + * @param[out] ranges number of ranges valid in @p range + * + * @return 0 on success, any other value on failure. + */ +static int get_memory_ranges_proc_iomem(struct memory_range **range, int *ranges) +{ + const char *iomem= proc_iomem(); + int memory_ranges = 0; + char line[MAX_LINE]; + FILE *fp; + fp = fopen(iomem, "r"); + if (!fp) { + fprintf(stderr, "Cannot open %s: %s\n", + iomem, strerror(errno)); + return -1; + } + while(fgets(line, sizeof(line), fp) != 0) { + unsigned long long start, end; + char *str; + int type; + int consumed; + int count; + if (memory_ranges >= MAX_MEMORY_RANGES) + break; + count = sscanf(line, "%Lx-%Lx : %n", + &start, &end, &consumed); + if (count != 2) + continue; + str = line + consumed; + end = end + 1; +#if 0 + printf("%016Lx-%016Lx : %s", + start, end, str); +#endif + if (memcmp(str, "System RAM\n", 11) == 0) { + type = RANGE_RAM; + } + else if (memcmp(str, "reserved\n", 9) == 0) { + type = RANGE_RESERVED; + } + else if (memcmp(str, "ACPI Tables\n", 12) == 0) { + type = RANGE_ACPI; + } + else if (memcmp(str, "ACPI Non-volatile Storage\n", 26) == 0) { + type = RANGE_ACPI_NVS; + } + else { + continue; + } + memory_range[memory_ranges].start = start; + memory_range[memory_ranges].end = end; + memory_range[memory_ranges].type = type; +#if 0 + printf("%016Lx-%016Lx : %x\n", + start, end, type); +#endif + memory_ranges++; + } + fclose(fp); + *range = memory_range; + *ranges = memory_ranges; + return 0; +} + +/** + * Calls the architecture independent get_firmware_memmap_ranges() to parse + * /sys/firmware/memmap and then do some x86 only modifications. + * + * @param[out] range pointer that will be set to an array that holds the + * memory ranges + * @param[out] ranges number of ranges valid in @p range + * + * @return 0 on success, any other value on failure. + */ +static int get_memory_ranges_sysfs(struct memory_range **range, int *ranges) +{ + int ret; + size_t range_number = MAX_MEMORY_RANGES; + + ret = get_firmware_memmap_ranges(memory_range, &range_number); + if (ret != 0) { + fprintf(stderr, "Parsing the /sys/firmware memory map failed. " + "Falling back to /proc/iomem.\n"); + return get_memory_ranges_proc_iomem(range, ranges); + } + + *range = memory_range; + *ranges = range_number; + + return 0; +} + +/** + * Return a sorted list of memory ranges. + * + * If we have the /sys/firmware/memmap interface, then use that. If not, + * or if parsing of that fails, use /proc/iomem as fallback. + * + * @param[out] range pointer that will be set to an array that holds the + * memory ranges + * @param[out] ranges number of ranges valid in @p range + * @param[in] kexec_flags the kexec_flags to determine if we load a normal + * or a crashdump kernel + * + * @return 0 on success, any other value on failure. + */ +int get_memory_ranges(struct memory_range **range, int *ranges, + unsigned long kexec_flags) +{ + int ret, i; + + if (have_sys_firmware_memmap()) + ret = get_memory_ranges_sysfs(range, ranges); + else + ret = get_memory_ranges_proc_iomem(range, ranges); + + /* + * both get_memory_ranges_sysfs() and get_memory_ranges_proc_iomem() + * have already printed an error message, so fail silently here + */ + if (ret != 0) + return ret; + + /* Don't report the interrupt table as ram */ + for (i = 0; i < *ranges; i++) { + if ((*range)[i].type == RANGE_RAM && + ((*range)[i].start < 0x100)) { + (*range)[i].start = 0x100; + break; + } + } + + /* + * Redefine the memory region boundaries if kernel + * exports the limits and if it is panic kernel. + * Override user values only if kernel exported values are + * subset of user defined values. + */ + if (kexec_flags & KEXEC_ON_CRASH) { + unsigned long long start, end; + + ret = parse_iomem_single("Crash kernel\n", &start, &end); + if (ret != 0) { + fprintf(stderr, "parse_iomem_single failed.\n"); + return -1; + } + + if (start > mem_min) + mem_min = start; + if (end < mem_max) + mem_max = end; + } + + /* just set 0 to 1 to enable printing for debugging */ +#if 0 + { + int i; + printf("MEMORY RANGES\n"); + for (i = 0; i < *ranges; i++) { + printf("%016Lx-%016Lx (%d)\n", (*range)[i].start, + (*range)[i].end, (*range)[i].type); + } + } +#endif + + return ret; +} + + |