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-rw-r--r--kexec/arch/i386/kexec-nbi.c249
1 files changed, 249 insertions, 0 deletions
diff --git a/kexec/arch/i386/kexec-nbi.c b/kexec/arch/i386/kexec-nbi.c
new file mode 100644
index 0000000..8eb2154
--- /dev/null
+++ b/kexec/arch/i386/kexec-nbi.c
@@ -0,0 +1,249 @@
+/*
+ * kexec: Linux boots Linux
+ *
+ * Copyright (C) 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.
+ */
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <elf.h>
+#include "../../kexec.h"
+#include "../../kexec-elf.h"
+#include "../../kexec-elf-boot.h"
+#include "kexec-x86.h"
+#include <arch/options.h>
+
+struct segheader
+{
+ uint8_t length;
+ uint8_t vendortag;
+ uint8_t reserved;
+ uint8_t flags;
+#define NBI_SEG 0x3
+#define NBI_SEG_ABSOLUTE 0
+#define NBI_SEG_APPEND 1
+#define NBI_SEG_NEGATIVE 2
+#define NBI_SEG_PREPEND 3
+#define NBI_LAST_SEG (1 << 2)
+ uint32_t loadaddr;
+ uint32_t imglength;
+ uint32_t memlength;
+};
+
+struct imgheader
+{
+#define NBI_MAGIC "\x36\x13\x03\x1b"
+ uint8_t magic[4];
+#define NBI_RETURNS (1 << 8)
+#define NBI_ENTRY32 (1 << 31)
+ uint32_t length; /* and flags */
+ struct { uint16_t bx, ds; } segoff;
+ union {
+ struct { uint16_t ip, cs; } segoff;
+ uint32_t linear;
+ } execaddr;
+};
+
+
+static const int probe_debug = 0;
+
+int nbi_probe(const char *buf, off_t len)
+{
+ struct imgheader hdr;
+ struct segheader seg;
+ off_t seg_off;
+ /* If we don't have enough data give up */
+ if (((uintmax_t)len < (uintmax_t)sizeof(hdr)) || (len < 512)) {
+ return -1;
+ }
+ memcpy(&hdr, buf, sizeof(hdr));
+ if (memcmp(hdr.magic, NBI_MAGIC, sizeof(hdr.magic)) != 0) {
+ return -1;
+ }
+ /* Ensure we have a properly sized header */
+ if (((hdr.length & 0xf)*4) != sizeof(hdr)) {
+ if (probe_debug) {
+ fprintf(stderr, "NBI: Bad vendor header size\n");
+ }
+ return -1;
+ }
+ /* Ensure the vendor header is not too large.
+ * This can't actually happen but....
+ */
+ if ((((hdr.length & 0xf0) >> 4)*4) > (512 - sizeof(hdr))) {
+ if (probe_debug) {
+ fprintf(stderr, "NBI: vendor headr too large\n");
+ }
+ return -1;
+ }
+ /* Reserved bits are set in the image... */
+ if ((hdr.length & 0x7ffffe00)) {
+ if (probe_debug) {
+ fprintf(stderr, "NBI: Reserved header bits set\n");
+ }
+ return -1;
+ }
+ /* If the image can return refuse to load it */
+ if (hdr.length & (1 << 8)) {
+ if (probe_debug) {
+ printf("NBI: image wants to return\n");
+ }
+ return -1;
+ }
+ /* Now verify the segments all fit within 512 bytes */
+ seg_off = (((hdr.length & 0xf0) >> 4) + (hdr.length & 0x0f)) << 2;
+ do {
+ memcpy(&seg, buf + seg_off, sizeof(seg));
+ if ((seg.length & 0xf) != 4) {
+ if (probe_debug) {
+ fprintf(stderr, "NBI: Invalid segment length\n");
+ }
+ return -1;
+ }
+ seg_off += ((seg.length & 0xf) + ((seg.length >> 4) & 0xf)) << 2;
+ if (seg.flags & 0xf8) {
+ if (probe_debug) {
+ fprintf(stderr, "NBI: segment reserved flags set\n");
+ }
+ return -1;
+ }
+ if ((seg.flags & NBI_SEG) == NBI_SEG_NEGATIVE) {
+ if (probe_debug) {
+ fprintf(stderr, "NBI: negative segment addresses not supported\n");
+ }
+ return -1;
+ }
+ if (seg_off > 512) {
+ if (probe_debug) {
+ fprintf(stderr, "NBI: segment outside 512 header\n");
+ }
+ return -1;
+ }
+ } while(!(seg.flags & NBI_LAST_SEG));
+ return 0;
+}
+
+void nbi_usage(void)
+{
+ printf( "\n"
+ );
+}
+
+int nbi_load(int argc, char **argv, const char *buf, off_t UNUSED(len),
+ struct kexec_info *info)
+{
+ struct imgheader hdr;
+ struct segheader seg;
+ off_t seg_off;
+ off_t file_off;
+ uint32_t last0, last1;
+ int opt;
+
+ static const struct option options[] = {
+ KEXEC_ARCH_OPTIONS
+ { 0, 0, NULL, 0 },
+ };
+
+ static const char short_options[] = KEXEC_OPT_STR "";
+
+ /*
+ * Parse the command line arguments
+ */
+ while((opt = getopt_long(argc, argv, short_options, options, 0)) != -1) {
+ switch(opt) {
+ default:
+ /* Ignore core options */
+ if (opt < OPT_ARCH_MAX) {
+ break;
+ }
+ }
+ }
+ /* Get a copy of the header */
+ memcpy(&hdr, buf, sizeof(hdr));
+
+ /* Load the first 512 bytes */
+ add_segment(info, buf + 0, 512,
+ (hdr.segoff.ds << 4) + hdr.segoff.bx, 512);
+
+ /* Initialize variables */
+ file_off = 512;
+ last0 = (hdr.segoff.ds << 4) + hdr.segoff.bx;
+ last1 = last0 + 512;
+
+ /* Load the segments */
+ seg_off = (((hdr.length & 0xf0) >> 4) + (hdr.length & 0x0f)) << 2;
+ do {
+ uint32_t loadaddr;
+ memcpy(&seg, buf + seg_off, sizeof(seg));
+ seg_off += ((seg.length & 0xf) + ((seg.length >> 4) & 0xf)) << 2;
+ if ((seg.flags & NBI_SEG) == NBI_SEG_ABSOLUTE) {
+ loadaddr = seg.loadaddr;
+ }
+ else if ((seg.flags & NBI_SEG) == NBI_SEG_APPEND) {
+ loadaddr = last1 + seg.loadaddr;
+ }
+#if 0
+ else if ((seg.flags & NBI_SEG) == NBI_SEG_NEGATIVE) {
+ loadaddr = memsize - seg.loadaddr;
+ }
+#endif
+ else if ((seg.flags & NBI_SEG) == NBI_SEG_PREPEND) {
+ loadaddr = last0 - seg.loadaddr;
+ }
+ else {
+ printf("warning: unhandled segment of type %0x\n",
+ seg.flags & NBI_SEG);
+ continue;
+ }
+ add_segment(info, buf + file_off, seg.imglength,
+ loadaddr, seg.memlength);
+ last0 = loadaddr;
+ last1 = last0 + seg.memlength;
+ file_off += seg.imglength;
+ } while(!(seg.flags & NBI_LAST_SEG));
+
+ if (hdr.length & NBI_ENTRY32) {
+ struct entry32_regs regs32;
+ /* Initialize the registers */
+ elf_rel_get_symbol(&info->rhdr, "entry32_regs32", &regs32, sizeof(regs32));
+ regs32.eip = hdr.execaddr.linear;
+ elf_rel_set_symbol(&info->rhdr, "entry32_regs32", &regs32, sizeof(regs32));
+ }
+ else {
+ struct entry32_regs regs32;
+ struct entry16_regs regs16;
+
+ /* Initialize the 16 bit registers */
+ elf_rel_get_symbol(&info->rhdr, "entry16_regs", &regs16, sizeof(regs16));
+ regs16.cs = hdr.execaddr.segoff.cs;
+ regs16.ip = hdr.execaddr.segoff.ip;
+ elf_rel_set_symbol(&info->rhdr, "entry16_regs", &regs16, sizeof(regs16));
+
+ /* Initialize the 32 bit registers */
+ elf_rel_get_symbol(&info->rhdr, "entry32_regs", &regs32, sizeof(regs32));
+ regs32.eip = elf_rel_get_addr(&info->rhdr, "entry16");
+ elf_rel_set_symbol(&info->rhdr, "entry32_regs", &regs32, sizeof(regs32));
+ }
+ return 0;
+}
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