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authorH. Peter Anvin <hpa@zytor.com>2007-03-15 18:20:55 -0700
committerH. Peter Anvin <hpa@zytor.com>2007-03-15 18:20:55 -0700
commit98d119af7d34ed22232fe2ee5577aeddc13144f4 (patch)
tree4bdc940c7d65d0fd0867ca40ab61dae874198cc8
parent5c55d7059b5078df7faad8b260cfc59abd1ab332 (diff)
downloadsyslinux-elf-98d119af7d34ed22232fe2ee5577aeddc13144f4.tar.gz
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Linux-loading module with optional DHCP generation.syslinux-3.40-pre15
Load a Linux module, generate initramfs and optionally add /dhcpinfo.dat with the DHCP query information.
-rw-r--r--com32/modules/Makefile2
-rw-r--r--com32/modules/linux.c236
2 files changed, 237 insertions, 1 deletions
diff --git a/com32/modules/Makefile b/com32/modules/Makefile
index 19fb3b33..7f3eae5d 100644
--- a/com32/modules/Makefile
+++ b/com32/modules/Makefile
@@ -45,7 +45,7 @@ INCDIR = /usr/include
COM32DIR = $(AUXDIR)/com32
MODULES = chain.c32 menu.c32 vesamenu.c32 ethersel.c32 mboot.c32 \
- dmitest.c32 cpuidtest.c32 pcitest.c32 elf.c32
+ dmitest.c32 cpuidtest.c32 pcitest.c32 elf.c32 linux.c32
TESTFILES =
all: $(MODULES) $(TESTFILES)
diff --git a/com32/modules/linux.c b/com32/modules/linux.c
new file mode 100644
index 00000000..dc5da575
--- /dev/null
+++ b/com32/modules/linux.c
@@ -0,0 +1,236 @@
+/* ----------------------------------------------------------------------- *
+ *
+ * Copyright 2007 H. Peter Anvin - All Rights Reserved
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall
+ * be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * linux.c
+ *
+ * Sample module to load Linux kernels. This module can also create
+ * a file out of the DHCP return data if running under PXELINUX.
+ *
+ * If -dhcpinfo is specified, the DHCP info is written into the file
+ * /dhcpinfo.dat in the initramfs.
+ *
+ * Usage: linux.c32 [-dhcpinfo] kernel arguments...
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <console.h>
+#include <syslinux/loadfile.h>
+#include <syslinux/linux.h>
+#include <syslinux/pxe.h>
+
+const char *progname = "linux.c32";
+
+/* Find the last instance of a particular command line argument
+ (which should include the final =; do not use for boolean arguments) */
+static char *find_argument(char **argv, const char *argument)
+{
+ int la = strlen(argument);
+ char **arg;
+ char *ptr = NULL;
+
+ for (arg = argv; *arg; arg++) {
+ if (!memcmp(*arg, argument, la))
+ ptr = *arg + la;
+ }
+
+ return ptr;
+}
+
+/* Get a value with a potential suffix (k/m/g/t/p/e) */
+static unsigned long long suffix_number(const char *str)
+{
+ char *ep;
+ unsigned long long v;
+ int shift;
+
+ v = strtoull(str, &ep, 0);
+ switch (*ep|0x20) {
+ case 'k':
+ shift = 10;
+ break;
+ case 'm':
+ shift = 20;
+ break;
+ case 'g':
+ shift = 30;
+ break;
+ case 't':
+ shift = 40;
+ break;
+ case 'p':
+ shift = 50;
+ break;
+ case 'e':
+ shift = 60;
+ break;
+ default:
+ shift = 0;
+ break;
+ }
+ v <<= shift;
+
+ return v;
+}
+
+/* Stitch together the command line from a set of argv's */
+static char *make_cmdline(char **argv)
+{
+ char **arg;
+ size_t bytes;
+ char *cmdline, *p;
+
+ bytes = 1; /* Just in case we have a zero-entry cmdline */
+ for (arg = argv; *arg; arg++) {
+ bytes += strlen(*arg)+1;
+ }
+
+ p = cmdline = malloc(bytes);
+ if (!cmdline)
+ return NULL;
+
+ for (arg = argv; *arg; arg++) {
+ int len = strlen(*arg);
+ memcpy(p, *arg, len);
+ p[len] = ' ';
+ p += len+1;
+ }
+
+ if (p > cmdline)
+ p--; /* Remove the last space */
+ *p = '\0';
+
+ return cmdline;
+}
+
+int main(int argc, char *argv[])
+{
+ uint32_t mem_limit = 0;
+ uint16_t video_mode = 0;
+ const char *kernel_name;
+ struct initramfs *initramfs;
+ char *cmdline;
+ char *boot_image;
+ void *kernel_data;
+ size_t kernel_len;
+ int opt_dhcpinfo = 0;
+ void *dhcpdata;
+ size_t dhcplen;
+ char **argp, *arg, *p;
+
+ openconsole(&dev_null_r, &dev_stdcon_w);
+
+ (void)argc;
+ argp = argv+1;
+
+ while ((arg = *argp) && arg[0] == '-') {
+ if (!strcmp("-dhcpinfo", arg)) {
+ opt_dhcpinfo = 1;
+ } else {
+ fprintf(stderr, "%s: unknown option: %s\n", progname, arg);
+ return 1;
+ }
+ }
+
+ if (!arg) {
+ fprintf(stderr, "%s: missing kernel name\n", progname);
+ return 1;
+ }
+
+ kernel_name = arg;
+
+ printf("Loading %s... ", kernel_name);
+ if (loadfile(kernel_name, &kernel_data, &kernel_len)) {
+ printf("failed!\n");
+ goto bail;
+ }
+ printf("ok\n");
+
+ boot_image = malloc(strlen(kernel_name)+12);
+ if (!boot_image)
+ goto bail;
+
+ strcpy(boot_image, "BOOT_IMAGE=");
+ strcpy(boot_image+11, kernel_name);
+
+ /* argp now points to the kernel name, and the command line follows.
+ Overwrite the kernel name with the BOOT_IMAGE= argument, and thus
+ we have the final argument. */
+ *argp = boot_image;
+
+ cmdline = make_cmdline(argp);
+ if (!cmdline)
+ goto bail;
+
+ /* Initialize the initramfs chain */
+ initramfs = initramfs_init();
+ if (!initramfs)
+ goto bail;
+
+ /* Look for specific command-line arguments we care about */
+ if ((arg = find_argument(argp, "mem=")))
+ mem_limit = suffix_number(arg);
+
+ if ((arg = find_argument(argp, "vga=")))
+ video_mode = strtoul(arg, NULL, 0);
+
+ if ((arg = find_argument(argp, "initrd="))) {
+ do {
+ p = strchr(arg, ',');
+ if (p)
+ *p = '\0';
+
+ printf("Loading %s... ", arg);
+ if (initramfs_load_archive(initramfs, arg)) {
+ printf("failed!\n");
+ goto bail;
+ }
+ printf("ok\n");
+
+ if (p)
+ *p++ = ',';
+ } while ((arg = p));
+ }
+
+ /* Append the DHCP info */
+ if (opt_dhcpinfo &&
+ !pxe_get_cached_info(PXENV_PACKET_TYPE_DHCP_ACK, &dhcpdata, &dhcplen)) {
+ if (initramfs_add_file(initramfs, dhcpdata, dhcplen, dhcplen,
+ "/dhcpinfo.dat", 0, 0755))
+ goto bail;
+ }
+
+ /* This should not return... */
+ syslinux_boot_linux(kernel_data, kernel_len, initramfs, cmdline,
+ video_mode, mem_limit);
+
+ bail:
+ fprintf(stderr, "Kernel load failure (insufficient memory?)\n");
+ return 1;
+}