[deliverable/linux.git] / arch / powerpc / boot / main.c

/*
 * Copyright (C) Paul Mackerras 1997.
 *
 * Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
 *
 * 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.
 */
#include <stdarg.h>
#include <stddef.h>
#include "elf.h"
#include "page.h"
#include "string.h"
#include "stdio.h"
#include "zlib.h"
#include "ops.h"
#include "flatdevtree.h"

extern void flush_cache(void *, unsigned long);

extern char _start[];
extern char __bss_start[];
extern char _end[];
extern char _vmlinux_start[];
extern char _vmlinux_end[];
extern char _initrd_start[];
extern char _initrd_end[];
extern char _dtb_start[];
extern char _dtb_end[];

struct addr_range {
	unsigned long addr;
	unsigned long size;
	unsigned long memsize;
};
static struct addr_range vmlinux;
static struct addr_range vmlinuz;
static struct addr_range initrd;

static unsigned long elfoffset;
static int is_64bit;

/* scratch space for gunzip; 46912 is from zlib_inflate_workspacesize() */
static char scratch[46912];
static char elfheader[256];

typedef void (*kernel_entry_t)(unsigned long, unsigned long, void *);

#undef DEBUG

#define HEAD_CRC	2
#define EXTRA_FIELD	4
#define ORIG_NAME	8
#define COMMENT		0x10
#define RESERVED	0xe0

static void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
{
	z_stream s;
	int r, i, flags;

	/* skip header */
	i = 10;
	flags = src[3];
	if (src[2] != Z_DEFLATED || (flags & RESERVED) != 0) {
		printf("bad gzipped data\n\r");
		exit();
	}
	if ((flags & EXTRA_FIELD) != 0)
		i = 12 + src[10] + (src[11] << 8);
	if ((flags & ORIG_NAME) != 0)
		while (src[i++] != 0)
			;
	if ((flags & COMMENT) != 0)
		while (src[i++] != 0)
			;
	if ((flags & HEAD_CRC) != 0)
		i += 2;
	if (i >= *lenp) {
		printf("gunzip: ran out of data in header\n\r");
		exit();
	}

	if (zlib_inflate_workspacesize() > sizeof(scratch)) {
		printf("gunzip needs more mem\n");
		exit();
	}
	memset(&s, 0, sizeof(s));
	s.workspace = scratch;
	r = zlib_inflateInit2(&s, -MAX_WBITS);
	if (r != Z_OK) {
		printf("inflateInit2 returned %d\n\r", r);
		exit();
	}
	s.next_in = src + i;
	s.avail_in = *lenp - i;
	s.next_out = dst;
	s.avail_out = dstlen;
	r = zlib_inflate(&s, Z_FULL_FLUSH);
	if (r != Z_OK && r != Z_STREAM_END) {
		printf("inflate returned %d msg: %s\n\r", r, s.msg);
		exit();
	}
	*lenp = s.next_out - (unsigned char *) dst;
	zlib_inflateEnd(&s);
}

static int is_elf64(void *hdr)
{
	Elf64_Ehdr *elf64 = hdr;
	Elf64_Phdr *elf64ph;
	unsigned int i;

	if (!(elf64->e_ident[EI_MAG0]  == ELFMAG0	&&
	      elf64->e_ident[EI_MAG1]  == ELFMAG1	&&
	      elf64->e_ident[EI_MAG2]  == ELFMAG2	&&
	      elf64->e_ident[EI_MAG3]  == ELFMAG3	&&
	      elf64->e_ident[EI_CLASS] == ELFCLASS64	&&
	      elf64->e_ident[EI_DATA]  == ELFDATA2MSB	&&
	      elf64->e_type            == ET_EXEC	&&
	      elf64->e_machine         == EM_PPC64))
		return 0;

	elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
				 (unsigned long)elf64->e_phoff);
	for (i = 0; i < (unsigned int)elf64->e_phnum; i++, elf64ph++)
		if (elf64ph->p_type == PT_LOAD)
			break;
	if (i >= (unsigned int)elf64->e_phnum)
		return 0;

	elfoffset = (unsigned long)elf64ph->p_offset;
	vmlinux.size = (unsigned long)elf64ph->p_filesz + elfoffset;
	vmlinux.memsize = (unsigned long)elf64ph->p_memsz + elfoffset;

	is_64bit = 1;
	return 1;
}

static int is_elf32(void *hdr)
{
	Elf32_Ehdr *elf32 = hdr;
	Elf32_Phdr *elf32ph;
	unsigned int i;

	if (!(elf32->e_ident[EI_MAG0]  == ELFMAG0	&&
	      elf32->e_ident[EI_MAG1]  == ELFMAG1	&&
	      elf32->e_ident[EI_MAG2]  == ELFMAG2	&&
	      elf32->e_ident[EI_MAG3]  == ELFMAG3	&&
	      elf32->e_ident[EI_CLASS] == ELFCLASS32	&&
	      elf32->e_ident[EI_DATA]  == ELFDATA2MSB	&&
	      elf32->e_type            == ET_EXEC	&&
	      elf32->e_machine         == EM_PPC))
		return 0;

	elf32 = (Elf32_Ehdr *)elfheader;
	elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff);
	for (i = 0; i < elf32->e_phnum; i++, elf32ph++)
		if (elf32ph->p_type == PT_LOAD)
			break;
	if (i >= elf32->e_phnum)
		return 0;

	elfoffset = elf32ph->p_offset;
	vmlinux.size = elf32ph->p_filesz + elf32ph->p_offset;
	vmlinux.memsize = elf32ph->p_memsz + elf32ph->p_offset;
	return 1;
}

static void prep_kernel(unsigned long a1, unsigned long a2)
{
	int len;

	vmlinuz.addr = (unsigned long)_vmlinux_start;
	vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);

	/* gunzip the ELF header of the kernel */
	if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
		len = vmlinuz.size;
		gunzip(elfheader, sizeof(elfheader),
				(unsigned char *)vmlinuz.addr, &len);
	} else
		memcpy(elfheader, (const void *)vmlinuz.addr,
		       sizeof(elfheader));

	if (!is_elf64(elfheader) && !is_elf32(elfheader)) {
		printf("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
		exit();
	}
	if (platform_ops.image_hdr)
		platform_ops.image_hdr(elfheader);

	/* We need to alloc the memsize plus the file offset since gzip
	 * will expand the header (file offset), then the kernel, then
	 * possible rubbish we don't care about. But the kernel bss must
	 * be claimed (it will be zero'd by the kernel itself)
	 */
	printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize);
	vmlinux.addr = (unsigned long)malloc(vmlinux.memsize);
	if (vmlinux.addr == 0) {
		printf("Can't allocate memory for kernel image !\n\r");
		exit();
	}

	/*
	 * Now find the initrd
	 *
	 * First see if we have an image attached to us.  If so
	 * allocate memory for it and copy it there.
	 */
	initrd.size = (unsigned long)(_initrd_end - _initrd_start);
	initrd.memsize = initrd.size;
	if (initrd.size > 0) {
		printf("Allocating 0x%lx bytes for initrd ...\n\r",
		       initrd.size);
		initrd.addr = (unsigned long)malloc((u32)initrd.size);
		if (initrd.addr == 0) {
			printf("Can't allocate memory for initial "
					"ramdisk !\n\r");
			exit();
		}
		printf("initial ramdisk moving 0x%lx <- 0x%lx "
			"(0x%lx bytes)\n\r", initrd.addr,
			(unsigned long)_initrd_start, initrd.size);
		memmove((void *)initrd.addr, (void *)_initrd_start,
			initrd.size);
		printf("initrd head: 0x%lx\n\r",
				*((unsigned long *)initrd.addr));
	} else if (a2 != 0) {
		/* Otherwise, see if yaboot or another loader gave us an initrd */
		initrd.addr = a1;
		initrd.memsize = initrd.size = a2;
		printf("Using loader supplied initrd at 0x%lx (0x%lx bytes)\n\r",
		       initrd.addr, initrd.size);
	}

	/* Eventually gunzip the kernel */
	if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
		printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
		       vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
		len = vmlinuz.size;
		gunzip((void *)vmlinux.addr, vmlinux.memsize,
			(unsigned char *)vmlinuz.addr, &len);
		printf("done 0x%lx bytes\n\r", len);
	} else {
		memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,
			vmlinuz.size);
	}

	/* Skip over the ELF header */
#ifdef DEBUG
	printf("... skipping 0x%lx bytes of ELF header\n\r",
			elfoffset);
#endif
	vmlinux.addr += elfoffset;

	flush_cache((void *)vmlinux.addr, vmlinux.size);
}

/* A buffer that may be edited by tools operating on a zImage binary so as to
 * edit the command line passed to vmlinux (by setting /chosen/bootargs).
 * The buffer is put in it's own section so that tools may locate it easier.
 */
static char builtin_cmdline[COMMAND_LINE_SIZE]
	__attribute__((__section__("__builtin_cmdline")));

static void get_cmdline(char *buf, int size)
{
	void *devp;
	int len = strlen(builtin_cmdline);

	buf[0] = '\0';

	if (len > 0) { /* builtin_cmdline overrides dt's /chosen/bootargs */
		len = min(len, size-1);
		strncpy(buf, builtin_cmdline, len);
		buf[len] = '\0';
	}
	else if ((devp = finddevice("/chosen")))
		getprop(devp, "bootargs", buf, size);
}

static void set_cmdline(char *buf)
{
	void *devp;

	if ((devp = finddevice("/chosen")))
		setprop(devp, "bootargs", buf, strlen(buf) + 1);
}

struct platform_ops platform_ops;
struct dt_ops dt_ops;
struct console_ops console_ops;

void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
{
	kernel_entry_t kentry;
	char cmdline[COMMAND_LINE_SIZE];

	memset(__bss_start, 0, _end - __bss_start);
	memset(&platform_ops, 0, sizeof(platform_ops));
	memset(&dt_ops, 0, sizeof(dt_ops));
	memset(&console_ops, 0, sizeof(console_ops));

	if (platform_init(promptr, _dtb_start, _dtb_end))
		exit();
	if (console_ops.open && (console_ops.open() < 0))
		exit();
	if (platform_ops.fixups)
		platform_ops.fixups();

	printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
	       _start, sp);

	prep_kernel(a1, a2);

	/* If cmdline came from zimage wrapper or if we can edit the one
	 * in the dt, print it out and edit it, if possible.
	 */
	if ((strlen(builtin_cmdline) > 0) || console_ops.edit_cmdline) {
		get_cmdline(cmdline, COMMAND_LINE_SIZE);
		printf("\n\rLinux/PowerPC load: %s", cmdline);
		if (console_ops.edit_cmdline)
			console_ops.edit_cmdline(cmdline, COMMAND_LINE_SIZE);
		printf("\n\r");
		set_cmdline(cmdline);
	}

	if (console_ops.close)
		console_ops.close();

	kentry = (kernel_entry_t) vmlinux.addr;
	if (_dtb_end > _dtb_start) {
		dt_ops.ft_pack();
		kentry(dt_ops.ft_addr(), 0, NULL);
	}
	else
		/* XXX initrd addr/size should be passed in properties */
		kentry(initrd.addr, initrd.size, promptr);

	/* console closed so printf below may not work */
	printf("Error: Linux kernel returned to zImage boot wrapper!\n\r");
	exit();
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) Paul Mackerras 1997.
	3	*
	4	* Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
decd300b OH	11	#include <stdarg.h>
	12	#include <stddef.h>
	13	#include "elf.h"
	14	#include "page.h"
	15	#include "string.h"
	16	#include "stdio.h"
1da177e4	17	#include "zlib.h"
b2c5f619 MG	18	#include "ops.h"
b2c5f619 MG	19	#include "flatdevtree.h"
decd300b	20
decd300b OH	21	extern void flush_cache(void *, unsigned long);
decd300b OH	22
1da177e4	23	extern char _start[];
9b0cbe97	24	extern char __bss_start[];
3cc747e9	25	extern char _end[];
1da177e4 LT	26	extern char _vmlinux_start[];
	27	extern char _vmlinux_end[];
	28	extern char _initrd_start[];
	29	extern char _initrd_end[];
c888554b MG	30	extern char _dtb_start[];
c888554b MG	31	extern char _dtb_end[];
1da177e4 LT	32
	33	struct addr_range {
	34	unsigned long addr;
	35	unsigned long size;
	36	unsigned long memsize;
	37	};
afbe8c4b OH	38	static struct addr_range vmlinux;
	39	static struct addr_range vmlinuz;
	40	static struct addr_range initrd;
1da177e4	41
94b212c2	42	static unsigned long elfoffset;
b2c5f619	43	static int is_64bit;
94b212c2	44
b2c5f619 MG	45	/* scratch space for gunzip; 46912 is from zlib_inflate_workspacesize() */
b2c5f619 MG	46	static char scratch[46912];
8a76baf0	47	static char elfheader[256];
7054036f	48
b2c5f619	49	typedef void (kernel_entry_t)(unsigned long, unsigned long, void );
1da177e4	50
1da177e4 LT	51	#undef DEBUG
1da177e4 LT	52
6bcc20b5 OH	53	#define HEAD_CRC 2
	54	#define EXTRA_FIELD 4
	55	#define ORIG_NAME 8
	56	#define COMMENT 0x10
	57	#define RESERVED 0xe0
	58
	59	static void gunzip(void dst, int dstlen, unsigned char src, int *lenp)
	60	{
	61	z_stream s;
	62	int r, i, flags;
	63
	64	/* skip header */
	65	i = 10;
	66	flags = src[3];
	67	if (src[2] != Z_DEFLATED \|\| (flags & RESERVED) != 0) {
	68	printf("bad gzipped data\n\r");
	69	exit();
	70	}
	71	if ((flags & EXTRA_FIELD) != 0)
	72	i = 12 + src[10] + (src[11] << 8);
	73	if ((flags & ORIG_NAME) != 0)
	74	while (src[i++] != 0)
	75	;
	76	if ((flags & COMMENT) != 0)
	77	while (src[i++] != 0)
	78	;
	79	if ((flags & HEAD_CRC) != 0)
	80	i += 2;
	81	if (i >= *lenp) {
	82	printf("gunzip: ran out of data in header\n\r");
	83	exit();
	84	}
	85
	86	if (zlib_inflate_workspacesize() > sizeof(scratch)) {
	87	printf("gunzip needs more mem\n");
	88	exit();
	89	}
	90	memset(&s, 0, sizeof(s));
	91	s.workspace = scratch;
	92	r = zlib_inflateInit2(&s, -MAX_WBITS);
	93	if (r != Z_OK) {
	94	printf("inflateInit2 returned %d\n\r", r);
	95	exit();
	96	}
	97	s.next_in = src + i;
	98	s.avail_in = *lenp - i;
	99	s.next_out = dst;
	100	s.avail_out = dstlen;
	101	r = zlib_inflate(&s, Z_FULL_FLUSH);
	102	if (r != Z_OK && r != Z_STREAM_END) {
	103	printf("inflate returned %d msg: %s\n\r", r, s.msg);
	104	exit();
	105	}
	106	lenp = s.next_out - (unsigned char ) dst;
	107	zlib_inflateEnd(&s);
	108	}
	109
94b212c2 PM	110	static int is_elf64(void *hdr)
	111	{
	112	Elf64_Ehdr *elf64 = hdr;
	113	Elf64_Phdr *elf64ph;
	114	unsigned int i;
	115
	116	if (!(elf64->e_ident[EI_MAG0] == ELFMAG0 &&
	117	elf64->e_ident[EI_MAG1] == ELFMAG1 &&
	118	elf64->e_ident[EI_MAG2] == ELFMAG2 &&
	119	elf64->e_ident[EI_MAG3] == ELFMAG3 &&
	120	elf64->e_ident[EI_CLASS] == ELFCLASS64 &&
	121	elf64->e_ident[EI_DATA] == ELFDATA2MSB &&
	122	elf64->e_type == ET_EXEC &&
	123	elf64->e_machine == EM_PPC64))
	124	return 0;
	125
	126	elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
	127	(unsigned long)elf64->e_phoff);
	128	for (i = 0; i < (unsigned int)elf64->e_phnum; i++, elf64ph++)
158daa4c	129	if (elf64ph->p_type == PT_LOAD)
94b212c2 PM	130	break;
	131	if (i >= (unsigned int)elf64->e_phnum)
	132	return 0;
	133
	134	elfoffset = (unsigned long)elf64ph->p_offset;
	135	vmlinux.size = (unsigned long)elf64ph->p_filesz + elfoffset;
	136	vmlinux.memsize = (unsigned long)elf64ph->p_memsz + elfoffset;
66a45dd3	137
b2c5f619	138	is_64bit = 1;
94b212c2 PM	139	return 1;
	140	}
	141
	142	static int is_elf32(void *hdr)
	143	{
	144	Elf32_Ehdr *elf32 = hdr;
	145	Elf32_Phdr *elf32ph;
	146	unsigned int i;
	147
	148	if (!(elf32->e_ident[EI_MAG0] == ELFMAG0 &&
	149	elf32->e_ident[EI_MAG1] == ELFMAG1 &&
	150	elf32->e_ident[EI_MAG2] == ELFMAG2 &&
	151	elf32->e_ident[EI_MAG3] == ELFMAG3 &&
	152	elf32->e_ident[EI_CLASS] == ELFCLASS32 &&
	153	elf32->e_ident[EI_DATA] == ELFDATA2MSB &&
	154	elf32->e_type == ET_EXEC &&
	155	elf32->e_machine == EM_PPC))
	156	return 0;
	157
	158	elf32 = (Elf32_Ehdr *)elfheader;
	159	elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff);
	160	for (i = 0; i < elf32->e_phnum; i++, elf32ph++)
158daa4c	161	if (elf32ph->p_type == PT_LOAD)
94b212c2 PM	162	break;
	163	if (i >= elf32->e_phnum)
	164	return 0;
	165
	166	elfoffset = elf32ph->p_offset;
	167	vmlinux.size = elf32ph->p_filesz + elf32ph->p_offset;
	168	vmlinux.memsize = elf32ph->p_memsz + elf32ph->p_offset;
	169	return 1;
	170	}
	171
f79e083c	172	static void prep_kernel(unsigned long a1, unsigned long a2)
1da177e4	173	{
8a76baf0	174	int len;
66a45dd3	175
94b212c2 PM	176	vmlinuz.addr = (unsigned long)_vmlinux_start;
	177	vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
	178
	179	/* gunzip the ELF header of the kernel */
	180	if ((unsigned short )vmlinuz.addr == 0x1f8b) {
	181	len = vmlinuz.size;
	182	gunzip(elfheader, sizeof(elfheader),
	183	(unsigned char *)vmlinuz.addr, &len);
	184	} else
b2c5f619 MG	185	memcpy(elfheader, (const void *)vmlinuz.addr,
b2c5f619 MG	186	sizeof(elfheader));
94b212c2 PM	187
	188	if (!is_elf64(elfheader) && !is_elf32(elfheader)) {
	189	printf("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
	190	exit();
	191	}
b2c5f619 MG	192	if (platform_ops.image_hdr)
b2c5f619 MG	193	platform_ops.image_hdr(elfheader);
94b212c2	194
b2c5f619	195	/* We need to alloc the memsize plus the file offset since gzip
c8e3c8b2 BH	196	* will expand the header (file offset), then the kernel, then
	197	* possible rubbish we don't care about. But the kernel bss must
	198	* be claimed (it will be zero'd by the kernel itself)
	199	*/
8a76baf0	200	printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize);
b2c5f619	201	vmlinux.addr = (unsigned long)malloc(vmlinux.memsize);
1da177e4 LT	202	if (vmlinux.addr == 0) {
	203	printf("Can't allocate memory for kernel image !\n\r");
	204	exit();
	205	}
1da177e4 LT	206
1da177e4 LT	207	/*
f79e083c DG	208	* Now find the initrd
	209	*
	210	* First see if we have an image attached to us. If so
	211	* allocate memory for it and copy it there.
1da177e4 LT	212	*/
	213	initrd.size = (unsigned long)(_initrd_end - _initrd_start);
	214	initrd.memsize = initrd.size;
f79e083c	215	if (initrd.size > 0) {
b2c5f619 MG	216	printf("Allocating 0x%lx bytes for initrd ...\n\r",
	217	initrd.size);
	218	initrd.addr = (unsigned long)malloc((u32)initrd.size);
1da177e4	219	if (initrd.addr == 0) {
b2c5f619 MG	220	printf("Can't allocate memory for initial "
b2c5f619 MG	221	"ramdisk !\n\r");
1da177e4 LT	222	exit();
1da177e4 LT	223	}
b2c5f619 MG	224	printf("initial ramdisk moving 0x%lx <- 0x%lx "
	225	"(0x%lx bytes)\n\r", initrd.addr,
	226	(unsigned long)_initrd_start, initrd.size);
	227	memmove((void )initrd.addr, (void )_initrd_start,
	228	initrd.size);
	229	printf("initrd head: 0x%lx\n\r",
	230	((unsigned long )initrd.addr));
f79e083c DG	231	} else if (a2 != 0) {
	232	/* Otherwise, see if yaboot or another loader gave us an initrd */
	233	initrd.addr = a1;
	234	initrd.memsize = initrd.size = a2;
	235	printf("Using loader supplied initrd at 0x%lx (0x%lx bytes)\n\r",
	236	initrd.addr, initrd.size);
1da177e4 LT	237	}
	238
	239	/* Eventually gunzip the kernel */
	240	if ((unsigned short )vmlinuz.addr == 0x1f8b) {
1da177e4 LT	241	printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
	242	vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
	243	len = vmlinuz.size;
8a76baf0	244	gunzip((void *)vmlinux.addr, vmlinux.memsize,
1da177e4 LT	245	(unsigned char *)vmlinuz.addr, &len);
1da177e4 LT	246	printf("done 0x%lx bytes\n\r", len);
1da177e4	247	} else {
b2c5f619 MG	248	memmove((void )vmlinux.addr,(void )vmlinuz.addr,
b2c5f619 MG	249	vmlinuz.size);
1da177e4 LT	250	}
	251
	252	/* Skip over the ELF header */
1da177e4 LT	253	#ifdef DEBUG
1da177e4 LT	254	printf("... skipping 0x%lx bytes of ELF header\n\r",
94b212c2	255	elfoffset);
1da177e4	256	#endif
94b212c2	257	vmlinux.addr += elfoffset;
1da177e4 LT	258
1da177e4 LT	259	flush_cache((void *)vmlinux.addr, vmlinux.size);
b2c5f619	260	}
1da177e4	261
b2c5f619 MG	262	/* A buffer that may be edited by tools operating on a zImage binary so as to
	263	* edit the command line passed to vmlinux (by setting /chosen/bootargs).
	264	* The buffer is put in it's own section so that tools may locate it easier.
	265	*/
	266	static char builtin_cmdline[COMMAND_LINE_SIZE]
	267	__attribute__((__section__("__builtin_cmdline")));
1da177e4	268
b2c5f619 MG	269	static void get_cmdline(char *buf, int size)
	270	{
	271	void *devp;
	272	int len = strlen(builtin_cmdline);
1da177e4	273
b2c5f619 MG	274	buf[0] = '\0';
	275
	276	if (len > 0) { /* builtin_cmdline overrides dt's /chosen/bootargs */
	277	len = min(len, size-1);
	278	strncpy(buf, builtin_cmdline, len);
	279	buf[len] = '\0';
	280	}
	281	else if ((devp = finddevice("/chosen")))
	282	getprop(devp, "bootargs", buf, size);
	283	}
	284
	285	static void set_cmdline(char *buf)
	286	{
	287	void *devp;
	288
	289	if ((devp = finddevice("/chosen")))
	290	setprop(devp, "bootargs", buf, strlen(buf) + 1);
1da177e4 LT	291	}
1da177e4 LT	292
b2c5f619 MG	293	struct platform_ops platform_ops;
	294	struct dt_ops dt_ops;
	295	struct console_ops console_ops;
	296
	297	void start(unsigned long a1, unsigned long a2, void promptr, void sp)
	298	{
b2c5f619 MG	299	kernel_entry_t kentry;
	300	char cmdline[COMMAND_LINE_SIZE];
	301
	302	memset(__bss_start, 0, _end - __bss_start);
	303	memset(&platform_ops, 0, sizeof(platform_ops));
	304	memset(&dt_ops, 0, sizeof(dt_ops));
	305	memset(&console_ops, 0, sizeof(console_ops));
	306
c888554b	307	if (platform_init(promptr, _dtb_start, _dtb_end))
b2c5f619 MG	308	exit();
	309	if (console_ops.open && (console_ops.open() < 0))
	310	exit();
	311	if (platform_ops.fixups)
	312	platform_ops.fixups();
	313
	314	printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
	315	_start, sp);
	316
f79e083c	317	prep_kernel(a1, a2);
b2c5f619 MG	318
	319	/* If cmdline came from zimage wrapper or if we can edit the one
	320	* in the dt, print it out and edit it, if possible.
	321	*/
	322	if ((strlen(builtin_cmdline) > 0) \|\| console_ops.edit_cmdline) {
	323	get_cmdline(cmdline, COMMAND_LINE_SIZE);
	324	printf("\n\rLinux/PowerPC load: %s", cmdline);
	325	if (console_ops.edit_cmdline)
	326	console_ops.edit_cmdline(cmdline, COMMAND_LINE_SIZE);
	327	printf("\n\r");
	328	set_cmdline(cmdline);
	329	}
	330
	331	if (console_ops.close)
	332	console_ops.close();
	333
	334	kentry = (kernel_entry_t) vmlinux.addr;
c888554b MG	335	if (_dtb_end > _dtb_start) {
c888554b MG	336	dt_ops.ft_pack();
b2c5f619	337	kentry(dt_ops.ft_addr(), 0, NULL);
c888554b	338	}
b2c5f619 MG	339	else
b2c5f619 MG	340	/* XXX initrd addr/size should be passed in properties */
f79e083c	341	kentry(initrd.addr, initrd.size, promptr);
b2c5f619 MG	342
	343	/* console closed so printf below may not work */
	344	printf("Error: Linux kernel returned to zImage boot wrapper!\n\r");
	345	exit();
	346	}