[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"

static void gunzip(void *, int, unsigned char *, int *);
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 _end[];
extern char _vmlinux_start[];
extern char _vmlinux_end[];
extern char _initrd_start[];
extern char _initrd_end[];
extern unsigned long vmlinux_filesize;
extern unsigned long vmlinux_memsize;

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() */


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


#undef DEBUG

static unsigned long claim_base;

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;
	kernel_entry_t kernel_entry;
	Elf64_Ehdr *elf64;
	Elf64_Phdr *elf64ph;

	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

	/*
	 * Now we try to claim some memory for the kernel itself
	 * our "vmlinux_memsize" is the memory footprint in RAM, _HOWEVER_, what
	 * our Makefile stuffs in is an image containing all sort of junk including
	 * an ELF header. We need to do some calculations here to find the right
	 * size... In practice we add 1Mb, that is enough, but we should really
	 * consider fixing the Makefile to put a _raw_ kernel in there !
	 */
	vmlinux_memsize += ONE_MB;
	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();
	}
	vmlinuz.addr = (unsigned long)_vmlinux_start;
	vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
	vmlinux.size = PAGE_ALIGN(vmlinux_filesize);
	vmlinux.memsize = vmlinux_memsize;

	/*
	 * 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) {
		int len;
		printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
		       vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
		len = vmlinuz.size;
		gunzip((void *)vmlinux.addr, vmlinux.size,
			(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 */
	elf64 = (Elf64_Ehdr *)vmlinux.addr;
	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;
	}
#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;
	vmlinux.size -= (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();
}

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