[U-Boot] [RFC][PATCH v2] bootm: Add sub commands

Kumar Gala galak at kernel.crashing.org
Tue Sep 23 08:27:16 CEST 2008


This version:
* cleans ups issues pointed out by Jerry
* adds a state machine to the command processing
* adds bd_t and cmdline process on linux for ppc

If this looks good I'll go ahead and clean it up for the other arches and OSes.

- k

Posting this again for discussion.  The two features I'm interested in
enabling are:

* Having the ability to modify the device tree before its passed to
 the kernel but after 'fdt boardsetup'

* Ability to do all setup but not actually jumping to the kernel.
 (This is useful as a way to setup the memory image [kernel, ramdisk,
  fdt, etc] for a different cpu than the boot one)

Having bootm sub-commands allows both of these as we can break up
the sequeunce of steps that are part of the bootm process.

---
 common/cmd_bootm.c |  150 +++++++++++++++++++++++++++++-
 include/image.h    |   20 ++++-
 lib_ppc/bootm.c    |  262 ++++++++++++++++++++++++++++++++++------------------
 3 files changed, 338 insertions(+), 94 deletions(-)

diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index 19257bb..1de11c2 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)
@@ -273,7 +274,7 @@ static int bootm_start(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	}
 
 	images.os.start = (ulong)os_hdr;
-	images.valid = 1;
+	images.state = BOOTM_STATE_START;
 
 	return 0;
 }
@@ -376,6 +377,121 @@ static int bootm_load_os(image_info_t os, ulong *load_end, int boot_progress)
 	return 0;
 }
 
+int do_bootm_subcommand (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	int ret = 0;
+	int state;
+
+	/* start */
+	if (argv[1][0] == 's') {
+		argc--;
+		argv++;
+		return bootm_start(cmdtp, flag, argc, argv);
+	}
+	/* loados */
+	else if (argv[1][0] == 'l') {
+		state = BOOTM_STATE_LOADOS;
+	}
+	/* ramdisk relocate */
+#if defined(CONFIG_PPC) || defined(CONFIG_M68K) || defined(CONFIG_SPARC)
+	else if (argv[1][0] == 'r') {
+		state = BOOTM_STATE_RAMDISK;
+	}
+#endif
+#ifdef CONFIG_OF_LIBFDT
+	/* fdt relocate */
+	else if (argv[1][0] == 'f') {
+		state = BOOTM_STATE_FDT;
+	}
+#endif
+	/* bd_t setup */
+	else if (argv[1][0] == 'b') {
+		state = BOOTM_STATE_OS_BD_T;
+	}
+	/* cmdline setup */
+	else if (argv[1][0] == 'c') {
+		state = BOOTM_STATE_OS_CMDLINE;
+	}
+	/* prep os */
+	else if (argv[1][0] == 'p') {
+		state = BOOTM_STATE_OS_PREP;
+	}
+	/* go */
+	else if (argv[1][0] == 'g') {
+		state = BOOTM_STATE_OS_GO;
+	}
+	/* 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;
+
+	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:
+			do_bootm_linux(BOOTM_STATE_OS_CMDLINE, argc, argv, &images);
+			break;
+		case BOOTM_STATE_OS_BD_T:
+			do_bootm_linux(BOOTM_STATE_OS_BD_T, argc, argv, &images);
+			break;
+		case BOOTM_STATE_OS_PREP:
+			do_bootm_linux(BOOTM_STATE_OS_PREP, argc, argv, &images);
+			break;
+		case BOOTM_STATE_OS_GO:
+			disable_interrupts();
+			do_bootm_linux(BOOTM_STATE_OS_GO, argc, argv, &images);
+			break;
+	}
+
+	return ret;
+}
+
 /*******************************************************************/
 /* bootm - boot application image from image in memory */
 /*******************************************************************/
@@ -386,6 +502,23 @@ int do_bootm (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	ulong		load_end = 0;
 	int		ret;
 
+	/* 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;
 
@@ -782,6 +915,21 @@ U_BOOT_CMD(
 	"\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 (its 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"
+	"\tprepos  - OS specific prep before relocation or go\n"
+	"\tgo      - start OS\n"
 );
 
 /*******************************************************************/
diff --git a/include/image.h b/include/image.h
index 82e6345..557e72a 100644
--- a/include/image.h
+++ b/include/image.h
@@ -228,6 +228,7 @@ typedef struct bootm_headers {
 #endif
 #endif
 
+#ifndef USE_HOSTCC
 	image_info_t	os;		/* os image info */
 	ulong		ep;		/* entry point of OS */
 
@@ -238,8 +239,25 @@ typedef struct bootm_headers {
 #endif
 	ulong		ft_len;		/* length of flat device tree */
 
+	ulong		initrd_start;
+	ulong		initrd_end;
+	ulong		cmdline_start;
+	ulong		cmdline_end;
+	bd_t		*kbd;
+#endif
+
 	int		verify;		/* getenv("verify")[0] != 'n' */
-	int		valid;		/* set to 1 if we've set values in the header */
+
+#define	BOOTM_STATE_START	(0x00000001)
+#define	BOOTM_STATE_LOADOS	(0x00000002)
+#define	BOOTM_STATE_RAMDISK	(0x00000004)
+#define	BOOTM_STATE_FDT		(0x00000008)
+#define	BOOTM_STATE_OS_CMDLINE	(0x00000010)
+#define	BOOTM_STATE_OS_BD_T	(0x00000020)
+#define	BOOTM_STATE_OS_PREP	(0x00000040)
+#define	BOOTM_STATE_OS_GO	(0x00000080)
+	int		state;
+
 #ifndef USE_HOSTCC
 	struct lmb	lmb;		/* for memory mgmt */
 #endif
diff --git a/lib_ppc/bootm.c b/lib_ppc/bootm.c
index 38266e1..8ac0de0 100644
--- a/lib_ppc/bootm.c
+++ b/lib_ppc/bootm.c
@@ -47,6 +47,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
 extern ulong get_effective_memsize(void);
 static ulong get_sp (void);
 static void set_clocks_in_mhz (bd_t *kbd);
@@ -55,30 +56,78 @@ static void set_clocks_in_mhz (bd_t *kbd);
 #define CFG_LINUX_LOWMEM_MAX_SIZE	(768*1024*1024)
 #endif
 
-__attribute__((noinline))
-int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
+static void boot_jump_linux(bootm_headers_t *images)
 {
-	ulong	sp;
-
-	ulong	initrd_start, initrd_end;
-	ulong	rd_len;
-	ulong	size;
-	phys_size_t bootm_size;
-
-	ulong	cmd_start, cmd_end, bootmap_base;
-	bd_t	*kbd;
 	void	(*kernel)(bd_t *, ulong r4, ulong r5, ulong r6,
 			  ulong r7, ulong r8, ulong r9);
-	int	ret;
-	ulong	of_size = images->ft_len;
-	struct lmb *lmb = &images->lmb;
-
-#if defined(CONFIG_OF_LIBFDT)
-	char	*of_flat_tree = images->ft_addr;
+#ifdef CONFIG_OF_LIBFDT
+	char *of_flat_tree = images->ft_addr;
 #endif
 
 	kernel = (void (*)(bd_t *, ulong, ulong, ulong,
 			   ulong, ulong, ulong))images->ep;
+	debug ("## Transferring control to Linux (at address %08lx) ...\n",
+		(ulong)kernel);
+
+	show_boot_progress (15);
+
+#if defined(CFG_INIT_RAM_LOCK) && !defined(CONFIG_E500)
+	unlock_ram_in_cache();
+#endif
+
+#if defined(CONFIG_OF_LIBFDT)
+	if (of_flat_tree) {	/* device tree; boot new style */
+		/*
+		 * Linux Kernel Parameters (passing device tree):
+		 *   r3: pointer to the fdt
+		 *   r4: 0
+		 *   r5: 0
+		 *   r6: epapr magic
+		 *   r7: size of IMA in bytes
+		 *   r8: 0
+		 *   r9: 0
+		 */
+#if defined(CONFIG_85xx) || defined(CONFIG_440)
+ #define EPAPR_MAGIC	(0x45504150)
+#else
+ #define EPAPR_MAGIC	(0x65504150)
+#endif
+
+		debug ("   Booting using OF flat tree...\n");
+		(*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
+			   CFG_BOOTMAPSZ, 0, 0);
+		/* does not return */
+	} else
+#endif
+	{
+		/*
+		 * Linux Kernel Parameters (passing board info data):
+		 *   r3: ptr to board info data
+		 *   r4: initrd_start or 0 if no initrd
+		 *   r5: initrd_end - unused if r4 is 0
+		 *   r6: Start of command line string
+		 *   r7: End   of command line string
+		 *   r8: 0
+		 *   r9: 0
+		 */
+		ulong cmd_start = images->cmdline_start;
+		ulong cmd_end = images->cmdline_end;
+		ulong initrd_start = images->initrd_start;
+		ulong initrd_end = images->initrd_end;
+		bd_t *kbd = images->kbd;
+
+		debug ("   Booting using board info...\n");
+		(*kernel) (kbd, initrd_start, initrd_end,
+			   cmd_start, cmd_end, 0, 0);
+		/* does not return */
+	}
+	return ;
+}
+
+static void boot_prep_linux(struct lmb *lmb)
+{
+	phys_size_t bootm_size;
+	ulong size, sp, bootmap_base;
 
 	bootmap_base = getenv_bootm_low();
 	bootm_size = getenv_bootm_size();
@@ -116,127 +165,156 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
 	sp -= 1024;
 	lmb_reserve(lmb, sp, (CFG_SDRAM_BASE + get_effective_memsize() - sp));
 
+	return ;
+}
+
+static int boot_cmdline_linux(bootm_headers_t *images)
+{
+	ulong bootmap_base = getenv_bootm_low();
+	ulong of_size = images->ft_len;
+	struct lmb *lmb = &images->lmb;
+	ulong *cmd_start = &images->cmdline_start;
+	ulong *cmd_end = &images->cmdline_end;
+
+	int ret = 0;
+
 	if (!of_size) {
 		/* allocate space and init command line */
-		ret = boot_get_cmdline (lmb, &cmd_start, &cmd_end, bootmap_base);
+		ret = boot_get_cmdline (lmb, cmd_start, cmd_end, bootmap_base);
 		if (ret) {
 			puts("ERROR with allocation of cmdline\n");
-			goto error;
+			return ret;
 		}
+	}
+
+	return ret;
+}
+
+static int boot_bd_t_linux(bootm_headers_t *images)
+{
+	ulong bootmap_base = getenv_bootm_low();
+	ulong of_size = images->ft_len;
+	struct lmb *lmb = &images->lmb;
+	bd_t **kbd = &images->kbd;
 
+	int ret = 0;
+
+	if (!of_size) {
 		/* allocate space for kernel copy of board info */
-		ret = boot_get_kbd (lmb, &kbd, bootmap_base);
+		ret = boot_get_kbd (lmb, kbd, bootmap_base);
 		if (ret) {
 			puts("ERROR with allocation of kernel bd\n");
-			goto error;
+			return ret;
 		}
-		set_clocks_in_mhz(kbd);
+		set_clocks_in_mhz(*kbd);
 	}
 
+	return ret;
+}
+
+static int boot_body_linux(bootm_headers_t *images)
+{
+	ulong rd_len, bootmap_base = getenv_bootm_low();
+	ulong of_size = images->ft_len;
+	struct lmb *lmb = &images->lmb;
+	ulong *initrd_start = &images->initrd_start;
+	ulong *initrd_end = &images->initrd_end;
+#if defined(CONFIG_OF_LIBFDT)
+	char **of_flat_tree = &images->ft_addr;
+#endif
+
+	int ret;
+
+	/* allocate space and init command line */
+	ret = boot_cmdline_linux(images);
+	if (ret)
+		return ret;
+
+	/* allocate space for kernel copy of board info */
+	ret = boot_bd_t_linux(images);
+	if (ret)
+		return ret;
+
 	rd_len = images->rd_end - images->rd_start;
+	ret = boot_ramdisk_high (lmb, images->rd_start, rd_len, initrd_start, initrd_end);
+	if (ret)
+		return ret;
 
 #if defined(CONFIG_OF_LIBFDT)
-	ret = boot_relocate_fdt(lmb, bootmap_base, &of_flat_tree, &of_size);
+	ret = boot_relocate_fdt(lmb, bootmap_base, of_flat_tree, &of_size);
 	if (ret)
-		goto error;
+		return ret;
 
 	/*
 	 * Add the chosen node if it doesn't exist, add the env and bd_t
 	 * if the user wants it (the logic is in the subroutines).
 	 */
 	if (of_size) {
-		if (fdt_chosen(of_flat_tree, 0) < 0) {
+		if (fdt_chosen(*of_flat_tree, 0) < 0) {
 			puts ("ERROR: ");
 			puts ("/chosen node create failed");
 			puts (" - must RESET the board to recover.\n");
-			goto error;
+			return -1;
 		}
 #ifdef CONFIG_OF_BOARD_SETUP
 		/* Call the board-specific fixup routine */
-		ft_board_setup(of_flat_tree, gd->bd);
+		ft_board_setup(*of_flat_tree, gd->bd);
 #endif
-	}
 
-	/* Fixup the fdt memreserve now that we know how big it is */
-	if (of_flat_tree) {
 		/* Delete the old LMB reservation */
-		lmb_free(lmb, (phys_addr_t)(u32)of_flat_tree,
-				(phys_size_t)fdt_totalsize(of_flat_tree));
+		lmb_free(lmb, (phys_addr_t)(u32)*of_flat_tree,
+				(phys_size_t)fdt_totalsize(*of_flat_tree));
 
-		ret = fdt_resize(of_flat_tree);
+		ret = fdt_resize(*of_flat_tree);
 		if (ret < 0)
-			goto error;
+			return ret;
 		of_size = ret;
 
-		if ((of_flat_tree) && (initrd_start && initrd_end))
+		if (*initrd_start && *initrd_end)
 			of_size += FDT_RAMDISK_OVERHEAD;
 		/* Create a new LMB reservation */
-		lmb_reserve(lmb, (ulong)of_flat_tree, of_size);
+		lmb_reserve(lmb, (ulong)*of_flat_tree, of_size);
+
+		/* fixup the initrd now that we know where it should be */
+		if (*initrd_start && *initrd_end)
+			fdt_initrd(*of_flat_tree, *initrd_start, *initrd_end, 1);
 	}
 #endif	/* CONFIG_OF_LIBFDT */
+	return 0;
+}
 
-	ret = boot_ramdisk_high (lmb, images->rd_start, rd_len, &initrd_start, &initrd_end);
-	if (ret)
-		goto error;
-
-#if defined(CONFIG_OF_LIBFDT)
-	/* fixup the initrd now that we know where it should be */
-	if ((of_flat_tree) && (initrd_start && initrd_end))
-		fdt_initrd(of_flat_tree, initrd_start, initrd_end, 1);
-#endif
-	debug ("## Transferring control to Linux (at address %08lx) ...\n",
-		(ulong)kernel);
+__attribute__((noinline))
+int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
+{
+	int	ret;
 
-	show_boot_progress (15);
+	if (flag & BOOTM_STATE_OS_CMDLINE) {
+		boot_cmdline_linux(images);
+		return 0;
+	}
 
-#if defined(CFG_INIT_RAM_LOCK) && !defined(CONFIG_E500)
-	unlock_ram_in_cache();
-#endif
+	if (flag & BOOTM_STATE_OS_BD_T) {
+		boot_bd_t_linux(images);
+		return 0;
+	}
 
-#if defined(CONFIG_OF_LIBFDT)
-	if (of_flat_tree) {	/* device tree; boot new style */
-		/*
-		 * Linux Kernel Parameters (passing device tree):
-		 *   r3: pointer to the fdt
-		 *   r4: 0
-		 *   r5: 0
-		 *   r6: epapr magic
-		 *   r7: size of IMA in bytes
-		 *   r8: 0
-		 *   r9: 0
-		 */
-#if defined(CONFIG_85xx) || defined(CONFIG_440)
- #define EPAPR_MAGIC	(0x45504150)
-#else
- #define EPAPR_MAGIC	(0x65504150)
-#endif
+	if (flag & BOOTM_STATE_OS_PREP) {
+		boot_prep_linux(&images->lmb);
+		return 0;
+	}
 
-		debug ("   Booting using OF flat tree...\n");
-		(*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
-			   CFG_BOOTMAPSZ, 0, 0);
-		/* does not return */
-	} else
-#endif
-	{
-		/*
-		 * Linux Kernel Parameters (passing board info data):
-		 *   r3: ptr to board info data
-		 *   r4: initrd_start or 0 if no initrd
-		 *   r5: initrd_end - unused if r4 is 0
-		 *   r6: Start of command line string
-		 *   r7: End   of command line string
-		 *   r8: 0
-		 *   r9: 0
-		 */
-		debug ("   Booting using board info...\n");
-		(*kernel) (kbd, initrd_start, initrd_end,
-			   cmd_start, cmd_end, 0, 0);
-		/* does not return */
+	if (flag & BOOTM_STATE_OS_GO) {
+		boot_jump_linux(images);
+		return 0;
 	}
-	return 1;
 
-error:
-	return 1;
+	boot_prep_linux(&images->lmb);
+	ret = boot_body_linux(images);
+	if (ret)
+		return ret;
+	boot_jump_linux(images);
+
+	return 0;
 }
 
 static ulong get_sp (void)
-- 
1.5.5.1



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