[deliverable/linux.git] / arch / ppc64 / 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 "prom.h"
#include "zlib.h"

extern void flush_cache(void *, unsigned long);


/* Value picked to match that used by yaboot */
#define PROG_START	0x01400000
#define RAM_END		(512<<20) // Fixme: use OF */
#define	ONE_MB		0x100000

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[];

struct addr_range {
	unsigned long addr;
	unsigned long size;
	unsigned long memsize;
};
static struct addr_range vmlinux = {0, 0, 0};
static struct addr_range vmlinuz = {0, 0, 0};
static struct addr_range initrd  = {0, 0, 0};

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


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


#undef DEBUG

static unsigned long claim_base;

#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 unsigned long try_claim(unsigned long size)
{
	unsigned long addr = 0;

	for(; claim_base < RAM_END; claim_base += ONE_MB) {
#ifdef DEBUG
		printf("    trying: 0x%08lx\n\r", claim_base);
#endif
		addr = (unsigned long)claim(claim_base, size, 0);
		if ((void *)addr != (void *)-1)
			break;
	}
	if (addr == 0)
		return 0;
	claim_base = PAGE_ALIGN(claim_base + size);
	return addr;
}

void start(unsigned long a1, unsigned long a2, void *promptr)
{
	unsigned long i;
	int len;
	kernel_entry_t kernel_entry;
	Elf64_Ehdr *elf64;
	Elf64_Phdr *elf64ph;

	memset(__bss_start, 0, _end - __bss_start);

	prom = (int (*)(void *)) promptr;
	chosen_handle = finddevice("/chosen");
	if (chosen_handle == (void *) -1)
		exit();
	if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4)
		exit();
	stderr = stdout;
	if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
		exit();

	printf("\n\rzImage starting: loaded at 0x%lx\n\r", (unsigned long) _start);

	/*
	 * The first available claim_base must be above the end of the
	 * the loaded kernel wrapper file (_start to _end includes the
	 * initrd image if it is present) and rounded up to a nice
	 * 1 MB boundary for good measure.
	 */

	claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);

#if defined(PROG_START)
	/*
	 * Maintain a "magic" minimum address. This keeps some older
	 * firmware platforms running.
	 */

	if (claim_base < PROG_START)
		claim_base = PROG_START;
#endif

	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));

	elf64 = (Elf64_Ehdr *)elfheader;
	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 )
	{
		printf("Error: not a valid PPC64 ELF file!\n\r");
		exit();
	}

	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 && elf64ph->p_offset != 0)
			break;
	}
	vmlinux.size = (unsigned long)elf64ph->p_filesz;
	vmlinux.memsize = (unsigned long)elf64ph->p_memsz;
	printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize);
	vmlinux.addr = try_claim(vmlinux.memsize);
	if (vmlinux.addr == 0) {
		printf("Can't allocate memory for kernel image !\n\r");
		exit();
	}

	/*
	 * Now we try to claim memory for the initrd (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 = try_claim(initrd.size);
		if (initrd.addr == 0) {
			printf("Can't allocate memory for initial ramdisk !\n\r");
			exit();
		}
		a1 = initrd.addr;
		a2 = initrd.size;
		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));
	}

	/* 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",
			(unsigned long)elf64ph->p_offset);
#endif
	vmlinux.addr += (unsigned long)elf64ph->p_offset;

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

	kernel_entry = (kernel_entry_t)vmlinux.addr;
#ifdef DEBUG
	printf( "kernel:\n\r"
		"        entry addr = 0x%lx\n\r"
		"        a1         = 0x%lx,\n\r"
		"        a2         = 0x%lx,\n\r"
		"        prom       = 0x%lx,\n\r"
		"        bi_recs    = 0x%lx,\n\r",
		(unsigned long)kernel_entry, a1, a2,
		(unsigned long)prom, NULL);
#endif

	kernel_entry( a1, a2, prom, NULL );

	printf("Error: Linux kernel returned to zImage bootloader!\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"
	17	#include "prom.h"
1da177e4	18	#include "zlib.h"
decd300b	19
decd300b OH	20	extern void flush_cache(void *, unsigned long);
decd300b OH	21
1da177e4 LT	22
	23	/* Value picked to match that used by yaboot */
	24	#define PROG_START 0x01400000
3cc747e9 MB	25	#define RAM_END (512<<20) // Fixme: use OF */
3cc747e9 MB	26	#define ONE_MB 0x100000
1da177e4	27
1da177e4	28	extern char _start[];
9b0cbe97	29	extern char __bss_start[];
3cc747e9	30	extern char _end[];
1da177e4 LT	31	extern char _vmlinux_start[];
	32	extern char _vmlinux_end[];
	33	extern char _initrd_start[];
	34	extern char _initrd_end[];
1da177e4 LT	35
	36	struct addr_range {
	37	unsigned long addr;
	38	unsigned long size;
	39	unsigned long memsize;
	40	};
decd300b OH	41	static struct addr_range vmlinux = {0, 0, 0};
	42	static struct addr_range vmlinuz = {0, 0, 0};
	43	static struct addr_range initrd = {0, 0, 0};
1da177e4	44
7054036f	45	static char scratch[46912]; /* scratch space for gunzip, from zlib_inflate_workspacesize() */
8a76baf0	46	static char elfheader[256];
7054036f	47
1da177e4 LT	48
	49	typedef void (*kernel_entry_t)( unsigned long,
	50	unsigned long,
	51	void *,
	52	void *);
	53
	54
1da177e4 LT	55	#undef DEBUG
1da177e4 LT	56
3cc747e9	57	static unsigned long claim_base;
1da177e4	58
6bcc20b5 OH	59	#define HEAD_CRC 2
	60	#define EXTRA_FIELD 4
	61	#define ORIG_NAME 8
	62	#define COMMENT 0x10
	63	#define RESERVED 0xe0
	64
	65	static void gunzip(void dst, int dstlen, unsigned char src, int *lenp)
	66	{
	67	z_stream s;
	68	int r, i, flags;
	69
	70	/* skip header */
	71	i = 10;
	72	flags = src[3];
	73	if (src[2] != Z_DEFLATED \|\| (flags & RESERVED) != 0) {
	74	printf("bad gzipped data\n\r");
	75	exit();
	76	}
	77	if ((flags & EXTRA_FIELD) != 0)
	78	i = 12 + src[10] + (src[11] << 8);
	79	if ((flags & ORIG_NAME) != 0)
	80	while (src[i++] != 0)
	81	;
	82	if ((flags & COMMENT) != 0)
	83	while (src[i++] != 0)
	84	;
	85	if ((flags & HEAD_CRC) != 0)
	86	i += 2;
	87	if (i >= *lenp) {
	88	printf("gunzip: ran out of data in header\n\r");
	89	exit();
	90	}
	91
	92	if (zlib_inflate_workspacesize() > sizeof(scratch)) {
	93	printf("gunzip needs more mem\n");
	94	exit();
	95	}
	96	memset(&s, 0, sizeof(s));
	97	s.workspace = scratch;
	98	r = zlib_inflateInit2(&s, -MAX_WBITS);
	99	if (r != Z_OK) {
	100	printf("inflateInit2 returned %d\n\r", r);
	101	exit();
	102	}
	103	s.next_in = src + i;
	104	s.avail_in = *lenp - i;
	105	s.next_out = dst;
	106	s.avail_out = dstlen;
	107	r = zlib_inflate(&s, Z_FULL_FLUSH);
	108	if (r != Z_OK && r != Z_STREAM_END) {
	109	printf("inflate returned %d msg: %s\n\r", r, s.msg);
	110	exit();
	111	}
	112	lenp = s.next_out - (unsigned char ) dst;
	113	zlib_inflateEnd(&s);
	114	}
	115
1da177e4 LT	116	static unsigned long try_claim(unsigned long size)
	117	{
	118	unsigned long addr = 0;
	119
3cc747e9	120	for(; claim_base < RAM_END; claim_base += ONE_MB) {
1da177e4 LT	121	#ifdef DEBUG
	122	printf(" trying: 0x%08lx\n\r", claim_base);
	123	#endif
	124	addr = (unsigned long)claim(claim_base, size, 0);
	125	if ((void )addr != (void )-1)
	126	break;
	127	}
	128	if (addr == 0)
	129	return 0;
	130	claim_base = PAGE_ALIGN(claim_base + size);
	131	return addr;
	132	}
	133
	134	void start(unsigned long a1, unsigned long a2, void *promptr)
	135	{
	136	unsigned long i;
8a76baf0	137	int len;
1da177e4 LT	138	kernel_entry_t kernel_entry;
	139	Elf64_Ehdr *elf64;
	140	Elf64_Phdr *elf64ph;
	141
9b0cbe97 OH	142	memset(__bss_start, 0, _end - __bss_start);
9b0cbe97 OH	143
1da177e4 LT	144	prom = (int ()(void )) promptr;
	145	chosen_handle = finddevice("/chosen");
	146	if (chosen_handle == (void *) -1)
	147	exit();
	148	if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4)
	149	exit();
	150	stderr = stdout;
	151	if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
	152	exit();
	153
3cc747e9 MB	154	printf("\n\rzImage starting: loaded at 0x%lx\n\r", (unsigned long) _start);
	155
	156	/*
	157	* The first available claim_base must be above the end of the
	158	* the loaded kernel wrapper file (_start to _end includes the
	159	* initrd image if it is present) and rounded up to a nice
	160	* 1 MB boundary for good measure.
	161	*/
	162
	163	claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
	164
	165	#if defined(PROG_START)
	166	/*
	167	* Maintain a "magic" minimum address. This keeps some older
	168	* firmware platforms running.
	169	*/
	170
	171	if (claim_base < PROG_START)
	172	claim_base = PROG_START;
	173	#endif
1da177e4	174
8a76baf0 OH	175	vmlinuz.addr = (unsigned long)_vmlinux_start;
	176	vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
	177
	178	/* gunzip the ELF header of the kernel */
	179	if ((unsigned short )vmlinuz.addr == 0x1f8b) {
	180	len = vmlinuz.size;
	181	gunzip(elfheader, sizeof(elfheader),
	182	(unsigned char *)vmlinuz.addr, &len);
	183	} else
	184	memcpy(elfheader, (const void *)vmlinuz.addr, sizeof(elfheader));
	185
	186	elf64 = (Elf64_Ehdr *)elfheader;
	187	if ( elf64->e_ident[EI_MAG0] != ELFMAG0 \|\|
	188	elf64->e_ident[EI_MAG1] != ELFMAG1 \|\|
	189	elf64->e_ident[EI_MAG2] != ELFMAG2 \|\|
	190	elf64->e_ident[EI_MAG3] != ELFMAG3 \|\|
	191	elf64->e_ident[EI_CLASS] != ELFCLASS64 \|\|
	192	elf64->e_ident[EI_DATA] != ELFDATA2MSB \|\|
	193	elf64->e_type != ET_EXEC \|\|
	194	elf64->e_machine != EM_PPC64 )
	195	{
	196	printf("Error: not a valid PPC64 ELF file!\n\r");
	197	exit();
	198	}
	199
	200	elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
	201	(unsigned long)elf64->e_phoff);
	202	for(i=0; i < (unsigned int)elf64->e_phnum ;i++,elf64ph++) {
	203	if (elf64ph->p_type == PT_LOAD && elf64ph->p_offset != 0)
	204	break;
	205	}
	206	vmlinux.size = (unsigned long)elf64ph->p_filesz;
	207	vmlinux.memsize = (unsigned long)elf64ph->p_memsz;
	208	printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize);
	209	vmlinux.addr = try_claim(vmlinux.memsize);
1da177e4 LT	210	if (vmlinux.addr == 0) {
	211	printf("Can't allocate memory for kernel image !\n\r");
	212	exit();
	213	}
1da177e4 LT	214
	215	/*
	216	* Now we try to claim memory for the initrd (and copy it there)
	217	*/
	218	initrd.size = (unsigned long)(_initrd_end - _initrd_start);
	219	initrd.memsize = initrd.size;
	220	if ( initrd.size > 0 ) {
	221	printf("Allocating 0x%lx bytes for initrd ...\n\r", initrd.size);
	222	initrd.addr = try_claim(initrd.size);
	223	if (initrd.addr == 0) {
	224	printf("Can't allocate memory for initial ramdisk !\n\r");
	225	exit();
	226	}
	227	a1 = initrd.addr;
	228	a2 = initrd.size;
b1bdfbd0	229	printf("initial ramdisk moving 0x%lx <- 0x%lx (0x%lx bytes)\n\r",
1da177e4 LT	230	initrd.addr, (unsigned long)_initrd_start, initrd.size);
1da177e4 LT	231	memmove((void )initrd.addr, (void )_initrd_start, initrd.size);
b1bdfbd0	232	printf("initrd head: 0x%lx\n\r", ((unsigned long )initrd.addr));
1da177e4 LT	233	}
	234
	235	/* Eventually gunzip the kernel */
	236	if ((unsigned short )vmlinuz.addr == 0x1f8b) {
1da177e4 LT	237	printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
	238	vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
	239	len = vmlinuz.size;
8a76baf0	240	gunzip((void *)vmlinux.addr, vmlinux.memsize,
1da177e4 LT	241	(unsigned char *)vmlinuz.addr, &len);
1da177e4 LT	242	printf("done 0x%lx bytes\n\r", len);
1da177e4 LT	243	} else {
	244	memmove((void )vmlinux.addr,(void )vmlinuz.addr,vmlinuz.size);
	245	}
	246
	247	/* Skip over the ELF header */
1da177e4 LT	248	#ifdef DEBUG
	249	printf("... skipping 0x%lx bytes of ELF header\n\r",
	250	(unsigned long)elf64ph->p_offset);
	251	#endif
	252	vmlinux.addr += (unsigned long)elf64ph->p_offset;
1da177e4 LT	253
	254	flush_cache((void *)vmlinux.addr, vmlinux.size);
	255
1da177e4 LT	256	kernel_entry = (kernel_entry_t)vmlinux.addr;
	257	#ifdef DEBUG
	258	printf( "kernel:\n\r"
	259	" entry addr = 0x%lx\n\r"
	260	" a1 = 0x%lx,\n\r"
	261	" a2 = 0x%lx,\n\r"
	262	" prom = 0x%lx,\n\r"
	263	" bi_recs = 0x%lx,\n\r",
	264	(unsigned long)kernel_entry, a1, a2,
	265	(unsigned long)prom, NULL);
	266	#endif
	267
	268	kernel_entry( a1, a2, prom, NULL );
	269
	270	printf("Error: Linux kernel returned to zImage bootloader!\n\r");
	271
	272	exit();
	273	}
	274