diff options
Diffstat (limited to 'contrib/syslinux-4.02/com32/modules/linux.c')
| -rw-r--r-- | contrib/syslinux-4.02/com32/modules/linux.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/modules/linux.c b/contrib/syslinux-4.02/com32/modules/linux.c new file mode 100644 index 0000000..b902ebc --- /dev/null +++ b/contrib/syslinux-4.02/com32/modules/linux.c @@ -0,0 +1,216 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright 2007-2008 H. Peter Anvin - All Rights Reserved + * Copyright 2009 Intel Corporation; author: H. Peter Anvin + * + * 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 <stdbool.h> +#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; +} + +/* Search for a boolean argument; return its position, or 0 if not present */ +static int find_boolean(char **argv, const char *argument) +{ + char **arg; + + for (arg = argv; *arg; arg++) { + if (!strcmp(*arg, argument)) + return (arg - argv) + 1; + } + + return 0; +} + +/* 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[]) +{ + const char *kernel_name; + struct initramfs *initramfs; + char *cmdline; + char *boot_image; + void *kernel_data; + size_t kernel_len; + bool opt_dhcpinfo = false; + bool opt_quiet = false; + 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 = true; + } else { + fprintf(stderr, "%s: unknown option: %s\n", progname, arg); + return 1; + } + argp++; + } + + if (!arg) { + fprintf(stderr, "%s: missing kernel name\n", progname); + return 1; + } + + kernel_name = arg; + + 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; + + if (find_boolean(argp, "quiet")) + opt_quiet = true; + + if (!opt_quiet) + printf("Loading %s... ", kernel_name); + if (loadfile(kernel_name, &kernel_data, &kernel_len)) { + if (opt_quiet) + printf("Loading %s ", kernel_name); + printf("failed!\n"); + goto bail; + } + if (!opt_quiet) + printf("ok\n"); + + cmdline = make_cmdline(argp); + if (!cmdline) + goto bail; + + /* Initialize the initramfs chain */ + initramfs = initramfs_init(); + if (!initramfs) + goto bail; + + if ((arg = find_argument(argp, "initrd="))) { + do { + p = strchr(arg, ','); + if (p) + *p = '\0'; + + if (!opt_quiet) + printf("Loading %s... ", arg); + if (initramfs_load_archive(initramfs, arg)) { + if (opt_quiet) + printf("Loading %s ", kernel_name); + printf("failed!\n"); + goto bail; + } + if (!opt_quiet) + 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); + +bail: + fprintf(stderr, "Kernel load failure (insufficient memory?)\n"); + return 1; +} |