[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		(256<<20) // Fixme: use OF */

static char *avail_ram;
static char *begin_avail, *end_avail;
static char *avail_high;
static unsigned int heap_use;
static unsigned int heap_max;

extern char _start[];
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[128<<10];	/* 128kB of scratch space for gunzip */

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


#undef DEBUG

static unsigned long claim_base = PROG_START;

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

	for(; claim_base < RAM_END; claim_base += 0x100000) {
#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%x\n\r", (unsigned)_start);

	/*
	 * 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 += 0x100000;
	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;
		avail_ram = scratch;
		begin_avail = avail_high = avail_ram;
		end_avail = scratch + sizeof(scratch);
		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);
		printf("0x%x bytes of heap consumed, max in use 0x%x\n\r",
		       (unsigned)(avail_high - begin_avail), heap_max);
	} 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();
}

struct memchunk {
	unsigned int size;
	unsigned int pad;
	struct memchunk *next;
};

static struct memchunk *freechunks;

void *zalloc(void *x, unsigned items, unsigned size)
{
	void *p;
	struct memchunk **mpp, *mp;

	size *= items;
	size = _ALIGN(size, sizeof(struct memchunk));
	heap_use += size;
	if (heap_use > heap_max)
		heap_max = heap_use;
	for (mpp = &freechunks; (mp = *mpp) != 0; mpp = &mp->next) {
		if (mp->size == size) {
			*mpp = mp->next;
			return mp;
		}
	}
	p = avail_ram;
	avail_ram += size;
	if (avail_ram > avail_high)
		avail_high = avail_ram;
	if (avail_ram > end_avail) {
		printf("oops... out of memory\n\r");
		pause();
	}
	return p;
}

void zfree(void *x, void *addr, unsigned nb)
{
	struct memchunk *mp = addr;

	nb = _ALIGN(nb, sizeof(struct memchunk));
	heap_use -= nb;
	if (avail_ram == addr + nb) {
		avail_ram = addr;
		return;
	}
	mp->size = nb;
	mp->next = freechunks;
	freechunks = mp;
}

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

#define DEFLATED	8

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] != 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();
	}

	s.zalloc = zalloc;
	s.zfree = zfree;
	r = 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 = 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;
	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
	26	#define RAM_END (256<<20) // Fixme: use OF */
	27
decd300b OH	28	static char *avail_ram;
	29	static char begin_avail, end_avail;
	30	static char *avail_high;
	31	static unsigned int heap_use;
	32	static unsigned int heap_max;
1da177e4 LT	33
	34	extern char _start[];
	35	extern char _vmlinux_start[];
	36	extern char _vmlinux_end[];
	37	extern char _initrd_start[];
	38	extern char _initrd_end[];
	39	extern unsigned long vmlinux_filesize;
	40	extern unsigned long vmlinux_memsize;
	41
	42	struct addr_range {
	43	unsigned long addr;
	44	unsigned long size;
	45	unsigned long memsize;
	46	};
decd300b OH	47	static struct addr_range vmlinux = {0, 0, 0};
	48	static struct addr_range vmlinuz = {0, 0, 0};
	49	static struct addr_range initrd = {0, 0, 0};
1da177e4 LT	50
	51	static char scratch[128<<10]; /* 128kB of scratch space for gunzip */
	52
	53	typedef void (*kernel_entry_t)( unsigned long,
	54	unsigned long,
	55	void *,
	56	void *);
	57
	58
1da177e4 LT	59	#undef DEBUG
	60
	61	static unsigned long claim_base = PROG_START;
	62
	63	static unsigned long try_claim(unsigned long size)
	64	{
	65	unsigned long addr = 0;
	66
	67	for(; claim_base < RAM_END; claim_base += 0x100000) {
	68	#ifdef DEBUG
	69	printf(" trying: 0x%08lx\n\r", claim_base);
	70	#endif
	71	addr = (unsigned long)claim(claim_base, size, 0);
	72	if ((void )addr != (void )-1)
	73	break;
	74	}
	75	if (addr == 0)
	76	return 0;
	77	claim_base = PAGE_ALIGN(claim_base + size);
	78	return addr;
	79	}
	80
	81	void start(unsigned long a1, unsigned long a2, void *promptr)
	82	{
	83	unsigned long i;
	84	kernel_entry_t kernel_entry;
	85	Elf64_Ehdr *elf64;
	86	Elf64_Phdr *elf64ph;
	87
	88	prom = (int ()(void )) promptr;
	89	chosen_handle = finddevice("/chosen");
	90	if (chosen_handle == (void *) -1)
	91	exit();
	92	if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4)
	93	exit();
	94	stderr = stdout;
	95	if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
	96	exit();
	97
	98	printf("\n\rzImage starting: loaded at 0x%x\n\r", (unsigned)_start);
	99
	100	/*
	101	* Now we try to claim some memory for the kernel itself
	102	* our "vmlinux_memsize" is the memory footprint in RAM, _HOWEVER_, what
	103	* our Makefile stuffs in is an image containing all sort of junk including
	104	* an ELF header. We need to do some calculations here to find the right
	105	* size... In practice we add 1Mb, that is enough, but we should really
	106	* consider fixing the Makefile to put a _raw_ kernel in there !
	107	*/
	108	vmlinux_memsize += 0x100000;
	109	printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux_memsize);
	110	vmlinux.addr = try_claim(vmlinux_memsize);
	111	if (vmlinux.addr == 0) {
	112	printf("Can't allocate memory for kernel image !\n\r");
	113	exit();
	114	}
	115	vmlinuz.addr = (unsigned long)_vmlinux_start;
	116	vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
	117	vmlinux.size = PAGE_ALIGN(vmlinux_filesize);
	118	vmlinux.memsize = vmlinux_memsize;
	119
	120	/*
	121	* Now we try to claim memory for the initrd (and copy it there)
	122	*/
123	initrd.size = (unsigned long)(_initrd_end - _initrd_start);
124	initrd.memsize = initrd.size;
125	if ( initrd.size > 0 ) {
126	printf("Allocating 0x%lx bytes for initrd ...\n\r", initrd.size);
127	initrd.addr = try_claim(initrd.size);
128	if (initrd.addr == 0) {
129	printf("Can't allocate memory for initial ramdisk !\n\r");
130	exit();
131	}
132	a1 = initrd.addr;
133	a2 = initrd.size;
b1bdfbd0	134	printf("initial ramdisk moving 0x%lx <- 0x%lx (0x%lx bytes)\n\r",
1da177e4 LT	135	initrd.addr, (unsigned long)_initrd_start, initrd.size);
1da177e4 LT	136	memmove((void )initrd.addr, (void )_initrd_start, initrd.size);
b1bdfbd0	137	printf("initrd head: 0x%lx\n\r", ((unsigned long )initrd.addr));
1da177e4 LT	138	}
	139
	140	/* Eventually gunzip the kernel */
	141	if ((unsigned short )vmlinuz.addr == 0x1f8b) {
	142	int len;
	143	avail_ram = scratch;
	144	begin_avail = avail_high = avail_ram;
	145	end_avail = scratch + sizeof(scratch);
	146	printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
	147	vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
	148	len = vmlinuz.size;
	149	gunzip((void *)vmlinux.addr, vmlinux.size,
	150	(unsigned char *)vmlinuz.addr, &len);
	151	printf("done 0x%lx bytes\n\r", len);
	152	printf("0x%x bytes of heap consumed, max in use 0x%x\n\r",
	153	(unsigned)(avail_high - begin_avail), heap_max);
	154	} else {
	155	memmove((void )vmlinux.addr,(void )vmlinuz.addr,vmlinuz.size);
	156	}
	157
	158	/* Skip over the ELF header */
	159	elf64 = (Elf64_Ehdr *)vmlinux.addr;
	160	if ( elf64->e_ident[EI_MAG0] != ELFMAG0 \|\|
	161	elf64->e_ident[EI_MAG1] != ELFMAG1 \|\|
	162	elf64->e_ident[EI_MAG2] != ELFMAG2 \|\|
	163	elf64->e_ident[EI_MAG3] != ELFMAG3 \|\|
	164	elf64->e_ident[EI_CLASS] != ELFCLASS64 \|\|
	165	elf64->e_ident[EI_DATA] != ELFDATA2MSB \|\|
	166	elf64->e_type != ET_EXEC \|\|
	167	elf64->e_machine != EM_PPC64 )
	168	{
	169	printf("Error: not a valid PPC64 ELF file!\n\r");
	170	exit();
	171	}
	172
	173	elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
	174	(unsigned long)elf64->e_phoff);
	175	for(i=0; i < (unsigned int)elf64->e_phnum ;i++,elf64ph++) {
	176	if (elf64ph->p_type == PT_LOAD && elf64ph->p_offset != 0)
	177	break;
	178	}
	179	#ifdef DEBUG
	180	printf("... skipping 0x%lx bytes of ELF header\n\r",
	181	(unsigned long)elf64ph->p_offset);
	182	#endif
	183	vmlinux.addr += (unsigned long)elf64ph->p_offset;
	184	vmlinux.size -= (unsigned long)elf64ph->p_offset;
	185
	186	flush_cache((void *)vmlinux.addr, vmlinux.size);
	187
1da177e4 LT	188	kernel_entry = (kernel_entry_t)vmlinux.addr;
	189	#ifdef DEBUG
	190	printf( "kernel:\n\r"
	191	" entry addr = 0x%lx\n\r"
	192	" a1 = 0x%lx,\n\r"
	193	" a2 = 0x%lx,\n\r"
	194	" prom = 0x%lx,\n\r"
	195	" bi_recs = 0x%lx,\n\r",
	196	(unsigned long)kernel_entry, a1, a2,
	197	(unsigned long)prom, NULL);
	198	#endif
	199
	200	kernel_entry( a1, a2, prom, NULL );
	201
	202	printf("Error: Linux kernel returned to zImage bootloader!\n\r");
	203
	204	exit();
	205	}
	206
	207	struct memchunk {
	208	unsigned int size;
	209	unsigned int pad;
	210	struct memchunk *next;
	211	};
	212
	213	static struct memchunk *freechunks;
	214
	215	void zalloc(void x, unsigned items, unsigned size)
	216	{
	217	void *p;
	218	struct memchunk *mpp, mp;
	219
	220	size *= items;
	221	size = _ALIGN(size, sizeof(struct memchunk));
	222	heap_use += size;
	223	if (heap_use > heap_max)
	224	heap_max = heap_use;
	225	for (mpp = &freechunks; (mp = *mpp) != 0; mpp = &mp->next) {
	226	if (mp->size == size) {
	227	*mpp = mp->next;
	228	return mp;
	229	}
	230	}
	231	p = avail_ram;
	232	avail_ram += size;
	233	if (avail_ram > avail_high)
	234	avail_high = avail_ram;
	235	if (avail_ram > end_avail) {
	236	printf("oops... out of memory\n\r");
	237	pause();
	238	}
	239	return p;
	240	}
	241
	242	void zfree(void x, void addr, unsigned nb)
	243	{
	244	struct memchunk *mp = addr;
	245
	246	nb = _ALIGN(nb, sizeof(struct memchunk));
	247	heap_use -= nb;
	248	if (avail_ram == addr + nb) {
	249	avail_ram = addr;
	250	return;
	251	}
252	mp->size = nb;
253	mp->next = freechunks;
254	freechunks = mp;
255	}
256
257	#define HEAD_CRC 2
258	#define EXTRA_FIELD 4
259	#define ORIG_NAME 8
260	#define COMMENT 0x10
261	#define RESERVED 0xe0
262
263	#define DEFLATED 8
264
decd300b	265	static void gunzip(void dst, int dstlen, unsigned char src, int *lenp)
1da177e4 LT	266	{
	267	z_stream s;
	268	int r, i, flags;
	269
	270	/* skip header */
	271	i = 10;
	272	flags = src[3];
	273	if (src[2] != DEFLATED \|\| (flags & RESERVED) != 0) {
	274	printf("bad gzipped data\n\r");
	275	exit();
	276	}
	277	if ((flags & EXTRA_FIELD) != 0)
	278	i = 12 + src[10] + (src[11] << 8);
	279	if ((flags & ORIG_NAME) != 0)
	280	while (src[i++] != 0)
	281	;
	282	if ((flags & COMMENT) != 0)
	283	while (src[i++] != 0)
	284	;
	285	if ((flags & HEAD_CRC) != 0)
	286	i += 2;
	287	if (i >= *lenp) {
	288	printf("gunzip: ran out of data in header\n\r");
	289	exit();
	290	}
	291
	292	s.zalloc = zalloc;
	293	s.zfree = zfree;
	294	r = inflateInit2(&s, -MAX_WBITS);
	295	if (r != Z_OK) {
	296	printf("inflateInit2 returned %d\n\r", r);
	297	exit();
	298	}
	299	s.next_in = src + i;
	300	s.avail_in = *lenp - i;
	301	s.next_out = dst;
	302	s.avail_out = dstlen;
	303	r = inflate(&s, Z_FINISH);
	304	if (r != Z_OK && r != Z_STREAM_END) {
	305	printf("inflate returned %d msg: %s\n\r", r, s.msg);
	306	exit();
	307	}
	308	lenp = s.next_out - (unsigned char ) dst;
	309	inflateEnd(&s);
	310	}
	311