arch/i386/lib/zimage.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2002
  * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
  *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of
  * the License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  * MA 02111-1307 USA
  */

 /*
  * Linux i386 zImage and bzImage loading
  *
  * based on the procdure described in
  * linux/Documentation/i386/boot.txt
  */

 #include <common.h>
 #include <asm/io.h>
 #include <asm/ptrace.h>
 #include <asm/zimage.h>
 #include <asm/realmode.h>
 #include <asm/byteorder.h>
 #include <asm/bootparam.h>
 #include <asm/ic/sc520.h>

 /*
  * Memory lay-out:
  *
  * relative to setup_base (which is 0x90000 currently)
  *
  *	0x0000-0x7FFF	Real mode kernel
  *	0x8000-0x8FFF	Stack and heap
  *	0x9000-0x90FF	Kernel command line
  */
 #define DEFAULT_SETUP_BASE  0x90000
 #define COMMAND_LINE_OFFSET 0x9000
 #define HEAP_END_OFFSET     0x8e00

 #define COMMAND_LINE_SIZE   2048

 static void build_command_line(char *command_line, int auto_boot)
 {
 	char *env_command_line;

 	command_line[0] = '\0';

 	env_command_line =  getenv("bootargs");

 	/* set console= argument if we use a serial console */
 	if (NULL == strstr(env_command_line, "console=")) {
 		if (0==strcmp(getenv("stdout"), "serial")) {

 			/* We seem to use serial console */
 			sprintf(command_line, "console=ttyS0,%s ",
 				 getenv("baudrate"));
 		}
 	}

 	if (auto_boot) {
 		strcat(command_line, "auto ");
 	}

 	if (NULL != env_command_line) {
 		strcat(command_line, env_command_line);
 	}


 	printf("Kernel command line: \"%s\"\n", command_line);
 }

 void *load_zimage(char *image, unsigned long kernel_size,
 		  unsigned long initrd_addr, unsigned long initrd_size,
 		  int auto_boot)
 {
 	void *setup_base;
 	int setup_size;
 	int bootproto;
 	int big_image;
 	void *load_address;

 	struct setup_header *hdr = (struct setup_header *)(image + SETUP_SECTS_OFF);

 	setup_base = (void*)DEFAULT_SETUP_BASE;	/* base address for real-mode segment */

 	if (KERNEL_MAGIC != hdr->boot_flag) {
 		printf("Error: Invalid Boot Flag (found 0x%04x, expected 0x%04x)\n",
 				hdr->boot_flag, KERNEL_MAGIC);
 		return 0;
 	} else {
 		printf("Valid Boot Flag\n");
 	}

 	/* determine boot protocol version */
 	if (KERNEL_V2_MAGIC == hdr->header) {
 		printf("Magic signature found\n");

 		bootproto = hdr->version;
 	} else {
 		/* Very old kernel */
 		printf("Magic signature not found\n");
 		bootproto = 0x0100;
 	}

 	/* determine size of setup */
 	if (0 == hdr->setup_sects) {
 		printf("Setup Sectors = 0 (defaulting to 4)\n");
 		setup_size = 5 * 512;
 	} else {
 		setup_size = (hdr->setup_sects + 1) * 512;
 	}

 	printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size);

 	if (setup_size > SETUP_MAX_SIZE) {
 		printf("Error: Setup is too large (%d bytes)\n", setup_size);
 	}

 	/* Determine image type */
 	big_image = (bootproto >= 0x0200) && (hdr->loadflags & BIG_KERNEL_FLAG);

 	/* Determine load address */
 	load_address = (void*)(big_image ? BZIMAGE_LOAD_ADDR : ZIMAGE_LOAD_ADDR);

 	/* load setup */
 	printf("Moving Real-Mode Code to 0x%8.8lx (%d bytes)\n", (ulong)setup_base, setup_size);
 	memmove(setup_base, image, setup_size);

 	printf("Using boot protocol version %x.%02x\n",
 	       (bootproto & 0xff00) >> 8, bootproto & 0xff);

 	if (bootproto == 0x0100) {

 		*(u16*)(setup_base + CMD_LINE_MAGIC_OFF) = COMMAND_LINE_MAGIC;
 		*(u16*)(setup_base + CMD_LINE_OFFSET_OFF) = COMMAND_LINE_OFFSET;

 		/* A very old kernel MUST have its real-mode code
 		 * loaded at 0x90000 */

 		if ((u32)setup_base != 0x90000) {
 			/* Copy the real-mode kernel */
 			memmove((void*)0x90000, setup_base, setup_size);
 			/* Copy the command line */
 			memmove((void*)0x99000, setup_base+COMMAND_LINE_OFFSET,
 			       COMMAND_LINE_SIZE);

 			setup_base = (void*)0x90000;		 /* Relocated */
 		}

 		/* It is recommended to clear memory up to the 32K mark */
 		memset((void*)0x90000 + setup_size, 0, SETUP_MAX_SIZE-setup_size);
 	}

 	/* We are now setting up the real-mode version of the header */
 	hdr = (struct setup_header *)(setup_base + SETUP_SECTS_OFF);

 	if (bootproto >= 0x0200) {
 		hdr->type_of_loader = 8;

 		if (hdr->setup_sects >= 15)
 			printf("Linux kernel version %s\n", (char *)
 					(setup_base + (hdr->kernel_version + 0x200)));
 		else
 			printf("Setup Sectors < 15 - Cannot print kernel version.\n");

 		if (initrd_addr) {
 			printf("Initial RAM disk at linear address 0x%08lx, size %ld bytes\n",
 			       initrd_addr, initrd_size);

 			hdr->ramdisk_image = initrd_addr;
 			hdr->ramdisk_size = initrd_size;
 		}
 	}

 	if (bootproto >= 0x0201) {
 		hdr->heap_end_ptr = HEAP_END_OFFSET;
 		hdr->loadflags |= HEAP_FLAG;
 	}

 	if (bootproto >= 0x0202) {
 		hdr->cmd_line_ptr = (u32)setup_base + COMMAND_LINE_OFFSET;
 	} else if (bootproto >= 0x0200) {

 		*(u16*)(setup_base + CMD_LINE_MAGIC_OFF) = COMMAND_LINE_MAGIC;
 		*(u16*)(setup_base + CMD_LINE_OFFSET_OFF) = COMMAND_LINE_OFFSET;

 		hdr->setup_move_size = 0x9100;
 	}

 	if (bootproto >= 0x0204)
 		kernel_size = hdr->syssize * 16;
 	else
 		kernel_size -= setup_size;


 	if (big_image) {
 		if ((kernel_size) > BZIMAGE_MAX_SIZE) {
 			printf("Error: bzImage kernel too big! (size: %ld, max: %d)\n",
 			       kernel_size, BZIMAGE_MAX_SIZE);
 			return 0;
 		}

 	} else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
 		printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
 		       kernel_size, ZIMAGE_MAX_SIZE);
 		return 0;
 	}

 	/* build command line at COMMAND_LINE_OFFSET */
 	build_command_line(setup_base + COMMAND_LINE_OFFSET, auto_boot);

 	printf("Loading %czImage at address 0x%08x (%ld bytes)\n", big_image ? 'b' : ' ',
 	       (u32)load_address, kernel_size);


 	memmove(load_address, image + setup_size, kernel_size);

 	/* ready for booting */
 	return setup_base;
 }

 void boot_zimage(void *setup_base)
 {
 	struct pt_regs regs;

 	memset(&regs, 0, sizeof(struct pt_regs));
 	regs.xds = (u32)setup_base >> 4;
 	regs.xes = regs.xds;
 	regs.xss = regs.xds;
 	regs.esp = 0x9000;
 	regs.eflags = 0;
 	enter_realmode(((u32)setup_base+SETUP_START_OFFSET)>>4, 0, &regs, &regs);
 }

 int do_zboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	void *base_ptr;
 	void *bzImage_addr = NULL;
 	char *s;
 	ulong bzImage_size = 0;

 	disable_interrupts();

 	/* Setup board for maximum PC/AT Compatibility */
 	setup_pcat_compatibility();

 	if (argc >= 2)
 		/* argv[1] holds the address of the bzImage */
 		s = argv[1];
 	else
 		s = getenv("fileaddr");

 	if (s)
 		bzImage_addr = (void *)simple_strtoul(s, NULL, 16);

 	if (argc >= 3)
 		/* argv[2] holds the size of the bzImage */
 		bzImage_size = simple_strtoul(argv[2], NULL, 16);

 	/* Lets look for*/
 	base_ptr = load_zimage (bzImage_addr, bzImage_size, 0, 0, 0);

 	if (NULL == base_ptr) {
 		printf ("## Kernel loading failed ...\n");
 	} else {
 		printf ("## Transferring control to Linux (at address %08x) ...\n",
 			(u32)base_ptr);

 		/* we assume that the kernel is in place */
 		printf("\nStarting kernel ...\n\n");

 		boot_zimage(base_ptr);
 		/* does not return */
 	}

 	return -1;
 }

 U_BOOT_CMD(
 	zboot, 2, 0,	do_zboot,
 	"Boot bzImage",
 	""
 );
	/*
	* (C) Copyright 2002
	* Daniel Engström, Omicron Ceti AB, daniel@omicron.se
	*
	* See file CREDITS for list of people who contributed to this
	* project.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation; either version 2 of
	* the License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	* MA 02111-1307 USA
	*/

	/*
	* Linux i386 zImage and bzImage loading
	*
	* based on the procdure described in
	* linux/Documentation/i386/boot.txt
	*/

	#include <common.h>
	#include <asm/io.h>
	#include <asm/ptrace.h>
	#include <asm/zimage.h>
	#include <asm/realmode.h>
	#include <asm/byteorder.h>
	#include <asm/bootparam.h>
	#include <asm/ic/sc520.h>

	/*
	* Memory lay-out:
	*
	* relative to setup_base (which is 0x90000 currently)
	*
	* 0x0000-0x7FFF Real mode kernel
	* 0x8000-0x8FFF Stack and heap
	* 0x9000-0x90FF Kernel command line
	*/
	#define DEFAULT_SETUP_BASE 0x90000
	#define COMMAND_LINE_OFFSET 0x9000
	#define HEAP_END_OFFSET 0x8e00

	#define COMMAND_LINE_SIZE 2048

	static void build_command_line(char *command_line, int auto_boot)
	{
	char *env_command_line;

	command_line[0] = '\0';

	env_command_line = getenv("bootargs");

	/* set console= argument if we use a serial console */
	if (NULL == strstr(env_command_line, "console=")) {
	if (0==strcmp(getenv("stdout"), "serial")) {

	/* We seem to use serial console */
	sprintf(command_line, "console=ttyS0,%s ",
	getenv("baudrate"));
	}
	}

	if (auto_boot) {
	strcat(command_line, "auto ");
	}

	if (NULL != env_command_line) {
	strcat(command_line, env_command_line);
	}


	printf("Kernel command line: \"%s\"\n", command_line);
	}

	void load_zimage(char image, unsigned long kernel_size,
	unsigned long initrd_addr, unsigned long initrd_size,
	int auto_boot)
	{
	void *setup_base;
	int setup_size;
	int bootproto;
	int big_image;
	void *load_address;

	struct setup_header hdr = (struct setup_header )(image + SETUP_SECTS_OFF);

	setup_base = (void)DEFAULT_SETUP_BASE; / base address for real-mode segment */

	if (KERNEL_MAGIC != hdr->boot_flag) {
	printf("Error: Invalid Boot Flag (found 0x%04x, expected 0x%04x)\n",
	hdr->boot_flag, KERNEL_MAGIC);
	return 0;
	} else {
	printf("Valid Boot Flag\n");
	}

	/* determine boot protocol version */
	if (KERNEL_V2_MAGIC == hdr->header) {
	printf("Magic signature found\n");

	bootproto = hdr->version;
	} else {
	/* Very old kernel */
	printf("Magic signature not found\n");
	bootproto = 0x0100;
	}

	/* determine size of setup */
	if (0 == hdr->setup_sects) {
	printf("Setup Sectors = 0 (defaulting to 4)\n");
	setup_size = 5 * 512;
	} else {
	setup_size = (hdr->setup_sects + 1) * 512;
	}

	printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size);

	if (setup_size > SETUP_MAX_SIZE) {
	printf("Error: Setup is too large (%d bytes)\n", setup_size);
	}

	/* Determine image type */
	big_image = (bootproto >= 0x0200) && (hdr->loadflags & BIG_KERNEL_FLAG);

	/* Determine load address */
	load_address = (void*)(big_image ? BZIMAGE_LOAD_ADDR : ZIMAGE_LOAD_ADDR);

	/* load setup */
	printf("Moving Real-Mode Code to 0x%8.8lx (%d bytes)\n", (ulong)setup_base, setup_size);
	memmove(setup_base, image, setup_size);

	printf("Using boot protocol version %x.%02x\n",
	(bootproto & 0xff00) >> 8, bootproto & 0xff);

	if (bootproto == 0x0100) {

	(u16)(setup_base + CMD_LINE_MAGIC_OFF) = COMMAND_LINE_MAGIC;
	(u16)(setup_base + CMD_LINE_OFFSET_OFF) = COMMAND_LINE_OFFSET;

	/* A very old kernel MUST have its real-mode code
	* loaded at 0x90000 */

	if ((u32)setup_base != 0x90000) {
	/* Copy the real-mode kernel */
	memmove((void*)0x90000, setup_base, setup_size);
	/* Copy the command line */
	memmove((void*)0x99000, setup_base+COMMAND_LINE_OFFSET,
	COMMAND_LINE_SIZE);

	setup_base = (void)0x90000; / Relocated */
	}

	/* It is recommended to clear memory up to the 32K mark */
	memset((void*)0x90000 + setup_size, 0, SETUP_MAX_SIZE-setup_size);
	}

	/* We are now setting up the real-mode version of the header */
	hdr = (struct setup_header *)(setup_base + SETUP_SECTS_OFF);

	if (bootproto >= 0x0200) {
	hdr->type_of_loader = 8;

	if (hdr->setup_sects >= 15)
	printf("Linux kernel version %s\n", (char *)
	(setup_base + (hdr->kernel_version + 0x200)));
	else
	printf("Setup Sectors < 15 - Cannot print kernel version.\n");

	if (initrd_addr) {
	printf("Initial RAM disk at linear address 0x%08lx, size %ld bytes\n",
	initrd_addr, initrd_size);

	hdr->ramdisk_image = initrd_addr;
	hdr->ramdisk_size = initrd_size;
	}
	}

	if (bootproto >= 0x0201) {
	hdr->heap_end_ptr = HEAP_END_OFFSET;
	hdr->loadflags \|= HEAP_FLAG;
	}

	if (bootproto >= 0x0202) {
	hdr->cmd_line_ptr = (u32)setup_base + COMMAND_LINE_OFFSET;
	} else if (bootproto >= 0x0200) {

	(u16)(setup_base + CMD_LINE_MAGIC_OFF) = COMMAND_LINE_MAGIC;
	(u16)(setup_base + CMD_LINE_OFFSET_OFF) = COMMAND_LINE_OFFSET;

	hdr->setup_move_size = 0x9100;
	}

	if (bootproto >= 0x0204)
	kernel_size = hdr->syssize * 16;
	else
	kernel_size -= setup_size;


	if (big_image) {
	if ((kernel_size) > BZIMAGE_MAX_SIZE) {
	printf("Error: bzImage kernel too big! (size: %ld, max: %d)\n",
	kernel_size, BZIMAGE_MAX_SIZE);
	return 0;
	}

	} else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
	printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
	kernel_size, ZIMAGE_MAX_SIZE);
	return 0;
	}

	/* build command line at COMMAND_LINE_OFFSET */
	build_command_line(setup_base + COMMAND_LINE_OFFSET, auto_boot);

	printf("Loading %czImage at address 0x%08x (%ld bytes)\n", big_image ? 'b' : ' ',
	(u32)load_address, kernel_size);


	memmove(load_address, image + setup_size, kernel_size);

	/* ready for booting */
	return setup_base;
	}

	void boot_zimage(void *setup_base)
	{
	struct pt_regs regs;

	memset(&regs, 0, sizeof(struct pt_regs));
	regs.xds = (u32)setup_base >> 4;
	regs.xes = regs.xds;
	regs.xss = regs.xds;
	regs.esp = 0x9000;
	regs.eflags = 0;
	enter_realmode(((u32)setup_base+SETUP_START_OFFSET)>>4, 0, &regs, &regs);
	}

	int do_zboot (cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
	{
	void *base_ptr;
	void *bzImage_addr = NULL;
	char *s;
	ulong bzImage_size = 0;

	disable_interrupts();

	/* Setup board for maximum PC/AT Compatibility */
	setup_pcat_compatibility();

	if (argc >= 2)
	/* argv[1] holds the address of the bzImage */
	s = argv[1];
	else
	s = getenv("fileaddr");

	if (s)
	bzImage_addr = (void *)simple_strtoul(s, NULL, 16);

	if (argc >= 3)
	/* argv[2] holds the size of the bzImage */
	bzImage_size = simple_strtoul(argv[2], NULL, 16);

	/* Lets look for*/
	base_ptr = load_zimage (bzImage_addr, bzImage_size, 0, 0, 0);

	if (NULL == base_ptr) {
	printf ("## Kernel loading failed ...\n");
	} else {
	printf ("## Transferring control to Linux (at address %08x) ...\n",
	(u32)base_ptr);

	/* we assume that the kernel is in place */
	printf("\nStarting kernel ...\n\n");

	boot_zimage(base_ptr);
	/* does not return */
	}

	return -1;
	}

	U_BOOT_CMD(
	zboot, 2, 0, do_zboot,
	"Boot bzImage",
	""
	);