bootm: Add subcommands
Add the ability to break the steps of the bootm command into several
subcommands: start, loados, ramdisk, fdt, bdt, cmdline, prep, go.
This allows us to do things like manipulate device trees before
they are passed to a booting kernel or setup memory for a secondary
core in multicore situations.
Not all OS types support all subcommands (currently only start, loados,
ramdisk, fdt, and go are supported).
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index b87ac49..20c31a7 100644
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -34,6 +34,7 @@
#include <bzlib.h>
#include <environment.h>
#include <lmb.h>
+#include <linux/ctype.h>
#include <asm/byteorder.h>
#if defined(CONFIG_CMD_USB)
@@ -296,7 +297,7 @@
}
images.os.start = (ulong)os_hdr;
- images.valid = 1;
+ images.state = BOOTM_STATE_START;
return 0;
}
@@ -399,6 +400,121 @@
return 0;
}
+/* we overload the cmd field with our state machine info instead of a
+ * function pointer */
+cmd_tbl_t cmd_bootm_sub[] = {
+ U_BOOT_CMD_MKENT(start, 0, 1, (void *)BOOTM_STATE_START, "", ""),
+ U_BOOT_CMD_MKENT(loados, 0, 1, (void *)BOOTM_STATE_LOADOS, "", ""),
+#if defined(CONFIG_PPC) || defined(CONFIG_M68K) || defined(CONFIG_SPARC)
+ U_BOOT_CMD_MKENT(ramdisk, 0, 1, (void *)BOOTM_STATE_RAMDISK, "", ""),
+#endif
+#ifdef CONFIG_OF_LIBFDT
+ U_BOOT_CMD_MKENT(fdt, 0, 1, (void *)BOOTM_STATE_FDT, "", ""),
+#endif
+ U_BOOT_CMD_MKENT(bdt, 0, 1, (void *)BOOTM_STATE_OS_BD_T, "", ""),
+ U_BOOT_CMD_MKENT(cmdline, 0, 1, (void *)BOOTM_STATE_OS_CMDLINE, "", ""),
+ U_BOOT_CMD_MKENT(prep, 0, 1, (void *)BOOTM_STATE_OS_PREP, "", ""),
+ U_BOOT_CMD_MKENT(go, 0, 1, (void *)BOOTM_STATE_OS_GO, "", ""),
+};
+
+int do_bootm_subcommand (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ int ret = 0;
+ int state;
+ cmd_tbl_t *c;
+ boot_os_fn *boot_fn;
+
+ c = find_cmd_tbl(argv[1], &cmd_bootm_sub[0], ARRAY_SIZE(cmd_bootm_sub));
+
+ if (c) {
+ state = (int)c->cmd;
+
+ /* treat start special since it resets the state machine */
+ if (state == BOOTM_STATE_START) {
+ argc--;
+ argv++;
+ return bootm_start(cmdtp, flag, argc, argv);
+ }
+ }
+ /* Unrecognized command */
+ else {
+ printf ("Usage:\n%s\n", cmdtp->usage);
+ return 1;
+ }
+
+ if (images.state >= state) {
+ printf ("Trying to execute a command out of order\n");
+ printf ("Usage:\n%s\n", cmdtp->usage);
+ return 1;
+ }
+
+ images.state |= state;
+ boot_fn = boot_os[images.os.os];
+
+ switch (state) {
+ ulong load_end;
+ case BOOTM_STATE_START:
+ /* should never occur */
+ break;
+ case BOOTM_STATE_LOADOS:
+ ret = bootm_load_os(images.os, &load_end, 0);
+ if (ret)
+ return ret;
+
+ lmb_reserve(&images.lmb, images.os.load,
+ (load_end - images.os.load));
+ break;
+#if defined(CONFIG_PPC) || defined(CONFIG_M68K) || defined(CONFIG_SPARC)
+ case BOOTM_STATE_RAMDISK:
+ {
+ ulong rd_len = images.rd_end - images.rd_start;
+ char str[17];
+
+ ret = boot_ramdisk_high(&images.lmb, images.rd_start,
+ rd_len, &images.initrd_start, &images.initrd_end);
+ if (ret)
+ return ret;
+
+ sprintf(str, "%lx", images.initrd_start);
+ setenv("initrd_start", str);
+ sprintf(str, "%lx", images.initrd_end);
+ setenv("initrd_end", str);
+ }
+ break;
+#endif
+#ifdef CONFIG_OF_LIBFDT
+ case BOOTM_STATE_FDT:
+ {
+ ulong bootmap_base = getenv_bootm_low();
+ ret = boot_relocate_fdt(&images.lmb, bootmap_base,
+ &images.ft_addr, &images.ft_len);
+ break;
+ }
+#endif
+ case BOOTM_STATE_OS_CMDLINE:
+ ret = boot_fn(BOOTM_STATE_OS_CMDLINE, argc, argv, &images);
+ if (ret)
+ printf ("cmdline subcommand not supported\n");
+ break;
+ case BOOTM_STATE_OS_BD_T:
+ ret = boot_fn(BOOTM_STATE_OS_BD_T, argc, argv, &images);
+ if (ret)
+ printf ("bdt subcommand not supported\n");
+ break;
+ case BOOTM_STATE_OS_PREP:
+ ret = boot_fn(BOOTM_STATE_OS_PREP, argc, argv, &images);
+ if (ret)
+ printf ("prep subcommand not supported\n");
+ break;
+ case BOOTM_STATE_OS_GO:
+ disable_interrupts();
+ boot_fn(BOOTM_STATE_OS_GO, argc, argv, &images);
+ break;
+ }
+
+ return ret;
+}
+
/*******************************************************************/
/* bootm - boot application image from image in memory */
/*******************************************************************/
@@ -419,6 +535,23 @@
relocated = 1;
}
+ /* determine if we have a sub command */
+ if (argc > 1) {
+ char *endp;
+
+ simple_strtoul(argv[1], &endp, 16);
+ /* endp pointing to NULL means that argv[1] was just a
+ * valid number, pass it along to the normal bootm processing
+ *
+ * If endp is ':' or '#' assume a FIT identifier so pass
+ * along for normal processing.
+ *
+ * Right now we assume the first arg should never be '-'
+ */
+ if ((*endp != 0) && (*endp != ':') && (*endp != '#'))
+ return do_bootm_subcommand(cmdtp, flag, argc, argv);
+ }
+
if (bootm_start(cmdtp, flag, argc, argv))
return 1;
@@ -783,6 +916,21 @@
"\tUse iminfo command to get the list of existing component\n"
"\timages and configurations.\n"
#endif
+ "\nSub-commands to do part of the bootm sequence. The sub-commands "
+ "must be\n"
+ "issued in the order below (it's ok to not issue all sub-commands):\n"
+ "\tstart [addr [arg ...]]\n"
+ "\tloados - load OS image\n"
+#if defined(CONFIG_PPC) || defined(CONFIG_M68K) || defined(CONFIG_SPARC)
+ "\tramdisk - relocate initrd, set env initrd_start/initrd_end\n"
+#endif
+#if defined(CONFIG_OF_LIBFDT)
+ "\tfdt - relocate flat device tree\n"
+#endif
+ "\tbdt - OS specific bd_t processing\n"
+ "\tcmdline - OS specific command line processing/setup\n"
+ "\tprep - OS specific prep before relocation or go\n"
+ "\tgo - start OS\n"
);
/*******************************************************************/
@@ -1022,6 +1170,9 @@
char *consdev;
char *cmdline;
+ if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
+ return 1;
+
#if defined(CONFIG_FIT)
if (!images->legacy_hdr_valid) {
fit_unsupported_reset ("NetBSD");
@@ -1102,6 +1253,9 @@
{
image_header_t *hdr = &images->legacy_hdr_os_copy;
+ if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
+ return 1;
+
#if defined(CONFIG_FIT)
if (!images->legacy_hdr_valid) {
fit_unsupported_reset ("Lynx");
@@ -1120,6 +1274,9 @@
{
void (*entry_point)(bd_t *);
+ if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
+ return 1;
+
#if defined(CONFIG_FIT)
if (!images->legacy_hdr_valid) {
fit_unsupported_reset ("RTEMS");
@@ -1149,6 +1306,9 @@
{
char str[80];
+ if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
+ return 1;
+
#if defined(CONFIG_FIT)
if (!images->legacy_hdr_valid) {
fit_unsupported_reset ("VxWorks");
@@ -1169,6 +1329,9 @@
char *local_args[2];
char str[16];
+ if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
+ return 1;
+
#if defined(CONFIG_FIT)
if (!images->legacy_hdr_valid) {
fit_unsupported_reset ("QNX");
@@ -1191,6 +1354,9 @@
{
void (*entry_point)(void);
+ if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
+ return 1;
+
#if defined(CONFIG_FIT)
if (!images->legacy_hdr_valid) {
fit_unsupported_reset ("INTEGRITY");