pxe: add support for parsing local syslinux files

Add a new command "sysboot" which parses syslinux menu files and boots
using kernel and initrd specified by menu files. The operation is similar
to "pxe boot" except local files on ext2 or fat filesystem are parsed.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>

common/cmd_pxe.c

@@ -132,6 +132,51 @@ static int get_bootfile_path(const char *file_path, char *bootfile_path,
 	return 1;
 }
 
+static int (*do_getfile)(char *file_path, char *file_addr);
+
+static int do_get_tftp(char *file_path, char *file_addr)
+{
+	char *tftp_argv[] = {"tftp", NULL, NULL, NULL};
+
+	tftp_argv[1] = file_addr;
+	tftp_argv[2] = file_path;
+
+	if (do_tftpb(NULL, 0, 3, tftp_argv))
+		return -ENOENT;
+
+	return 1;
+}
+
+static char *fs_argv[5];
+
+static int do_get_ext2(char *file_path, char *file_addr)
+{
+#ifdef CONFIG_CMD_EXT2
+	fs_argv[0] = "ext2load";
+	fs_argv[3] = file_addr;
+	fs_argv[4] = file_path;
+
+	if (!do_ext2load(NULL, 0, 5, fs_argv))
+		return 1;
+#endif
+	return -ENOENT;
+}
+
+static int do_get_fat(char *file_path, char *file_addr)
+{
+#ifdef CONFIG_CMD_FAT
+	fs_argv[0] = "fatload";
+	fs_argv[3] = file_addr;
+	fs_argv[4] = file_path;
+
+	if (!do_fat_fsload(NULL, 0, 5, fs_argv))
+		return 1;
+#endif
+	return -ENOENT;
+}
+
+
+
 /*
  * As in pxelinux, paths to files referenced from files we retrieve are
  * relative to the location of bootfile. get_relfile takes such a path and
@@ -145,7 +190,6 @@ static int get_relfile(char *file_path, void *file_addr)
 	size_t path_len;
 	char relfile[MAX_TFTP_PATH_LEN+1];
 	char addr_buf[10];
-	char *tftp_argv[] = {"tftp", NULL, NULL, NULL};
 	int err;
 
 	err = get_bootfile_path(file_path, relfile, sizeof(relfile));
@@ -170,13 +214,7 @@ static int get_relfile(char *file_path, void *file_addr)
 
 	sprintf(addr_buf, "%p", file_addr);
 
-	tftp_argv[1] = addr_buf;
-	tftp_argv[2] = relfile;
-
-	if (do_tftpb(NULL, 0, 3, tftp_argv))
-		return -ENOENT;
-
-	return 1;
+	return do_getfile(relfile, addr_buf);
 }
 
 /*
@@ -322,6 +360,8 @@ do_pxe_get(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	unsigned long pxefile_addr_r;
 	int err;
 
+	do_getfile = do_get_tftp;
+
 	if (argc != 1)
 		return CMD_RET_USAGE;
 
@@ -1331,6 +1371,8 @@ do_pxe_boot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	struct pxe_menu *cfg;
 	char *pxefile_addr_str;
 
+	do_getfile = do_get_tftp;
+
 	if (argc == 1) {
 		pxefile_addr_str = from_env("pxefile_addr_r");
 		if (!pxefile_addr_str)
@@ -1391,3 +1433,86 @@ U_BOOT_CMD(
 	"get - try to retrieve a pxe file using tftp\npxe "
 	"boot [pxefile_addr_r] - boot from the pxe file at pxefile_addr_r\n"
 );
+
+/*
+ * Boots a system using a local disk syslinux/extlinux file
+ *
+ * Returns 0 on success, 1 on error.
+ */
+int do_sysboot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	unsigned long pxefile_addr_r;
+	struct pxe_menu *cfg;
+	char *pxefile_addr_str;
+	char *filename;
+	int prompt = 0;
+
+	if (strstr(argv[1], "-p")) {
+		prompt = 1;
+		argc--;
+		argv++;
+	}
+
+	if (argc < 4)
+		return cmd_usage(cmdtp);
+
+	if (argc < 5) {
+		pxefile_addr_str = from_env("pxefile_addr_r");
+		if (!pxefile_addr_str)
+			return 1;
+	} else {
+		pxefile_addr_str = argv[4];
+	}
+
+	if (argc < 6)
+		filename = getenv("bootfile");
+	else {
+		filename = argv[5];
+		setenv("bootfile", filename);
+	}
+
+	if (strstr(argv[3], "ext2"))
+		do_getfile = do_get_ext2;
+	else if (strstr(argv[3], "fat"))
+		do_getfile = do_get_fat;
+	else {
+		printf("Invalid filesystem: %s\n", argv[3]);
+		return 1;
+	}
+	fs_argv[1] = argv[1];
+	fs_argv[2] = argv[2];
+
+	if (strict_strtoul(pxefile_addr_str, 16, &pxefile_addr_r) < 0) {
+		printf("Invalid pxefile address: %s\n", pxefile_addr_str);
+		return 1;
+	}
+
+	if (get_pxe_file(filename, (void *)pxefile_addr_r) < 0) {
+		printf("Error reading config file\n");
+		return 1;
+	}
+
+	cfg = parse_pxefile((char *)(pxefile_addr_r));
+
+	if (cfg == NULL) {
+		printf("Error parsing config file\n");
+		return 1;
+	}
+
+	if (prompt)
+		cfg->prompt = 1;
+
+	handle_pxe_menu(cfg);
+
+	destroy_pxe_menu(cfg);
+
+	return 0;
+}
+
+U_BOOT_CMD(
+	sysboot, 7, 1, do_sysboot,
+	"command to get and boot from syslinux files",
+	"[-p] <interface> <dev[:part]> <ext2|fat> [addr] [filename]\n"
+	"    - load and parse syslinux menu file 'filename' from ext2 or fat\n"
+	"      filesystem on 'dev' on 'interface' to address 'addr'"
+);

include/common.h

@@ -325,6 +325,12 @@ void	doc_probe(unsigned long physadr);
 /* common/cmd_net.c */
 int do_tftpb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
 
+/* common/cmd_fat.c */
+int do_fat_fsload(cmd_tbl_t *, int, int, char * const []);
+
+/* common/cmd_ext2.c */
+int do_ext2load(cmd_tbl_t *, int, int, char * const []);
+
 /* common/cmd_nvedit.c */
 int	env_init     (void);
 void	env_relocate (void);