[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

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 _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[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;

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;
		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
3cc747e9 MB	26	#define RAM_END (512<<20) // Fixme: use OF */
3cc747e9 MB	27	#define ONE_MB 0x100000
1da177e4	28
decd300b OH	29	static char *avail_ram;
	30	static char begin_avail, end_avail;
	31	static char *avail_high;
	32	static unsigned int heap_use;
	33	static unsigned int heap_max;
1da177e4 LT	34
1da177e4 LT	35	extern char _start[];
3cc747e9	36	extern char _end[];
1da177e4 LT	37	extern char _vmlinux_start[];
	38	extern char _vmlinux_end[];
	39	extern char _initrd_start[];
	40	extern char _initrd_end[];
	41	extern unsigned long vmlinux_filesize;
	42	extern unsigned long vmlinux_memsize;
	43
	44	struct addr_range {
	45	unsigned long addr;
	46	unsigned long size;
	47	unsigned long memsize;
	48	};
decd300b OH	49	static struct addr_range vmlinux = {0, 0, 0};
	50	static struct addr_range vmlinuz = {0, 0, 0};
	51	static struct addr_range initrd = {0, 0, 0};
1da177e4 LT	52
	53	static char scratch[128<<10]; /* 128kB of scratch space for gunzip */
	54
	55	typedef void (*kernel_entry_t)( unsigned long,
	56	unsigned long,
	57	void *,
	58	void *);
	59
	60
1da177e4 LT	61	#undef DEBUG
1da177e4 LT	62
3cc747e9	63	static unsigned long claim_base;
1da177e4 LT	64
	65	static unsigned long try_claim(unsigned long size)
	66	{
	67	unsigned long addr = 0;
	68
3cc747e9	69	for(; claim_base < RAM_END; claim_base += ONE_MB) {
1da177e4 LT	70	#ifdef DEBUG
	71	printf(" trying: 0x%08lx\n\r", claim_base);
	72	#endif
	73	addr = (unsigned long)claim(claim_base, size, 0);
	74	if ((void )addr != (void )-1)
	75	break;
	76	}
	77	if (addr == 0)
	78	return 0;
	79	claim_base = PAGE_ALIGN(claim_base + size);
	80	return addr;
	81	}
	82
	83	void start(unsigned long a1, unsigned long a2, void *promptr)
	84	{
	85	unsigned long i;
	86	kernel_entry_t kernel_entry;
	87	Elf64_Ehdr *elf64;
	88	Elf64_Phdr *elf64ph;
	89
	90	prom = (int ()(void )) promptr;
	91	chosen_handle = finddevice("/chosen");
	92	if (chosen_handle == (void *) -1)
	93	exit();
	94	if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4)
	95	exit();
	96	stderr = stdout;
	97	if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
	98	exit();
	99
3cc747e9 MB	100	printf("\n\rzImage starting: loaded at 0x%lx\n\r", (unsigned long) _start);
	101
	102	/*
	103	* The first available claim_base must be above the end of the
	104	* the loaded kernel wrapper file (_start to _end includes the
	105	* initrd image if it is present) and rounded up to a nice
	106	* 1 MB boundary for good measure.
	107	*/
	108
	109	claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
	110
	111	#if defined(PROG_START)
	112	/*
	113	* Maintain a "magic" minimum address. This keeps some older
	114	* firmware platforms running.
	115	*/
	116
	117	if (claim_base < PROG_START)
	118	claim_base = PROG_START;
	119	#endif
1da177e4 LT	120
	121	/*
	122	* Now we try to claim some memory for the kernel itself
	123	* our "vmlinux_memsize" is the memory footprint in RAM, _HOWEVER_, what
	124	* our Makefile stuffs in is an image containing all sort of junk including
	125	* an ELF header. We need to do some calculations here to find the right
	126	* size... In practice we add 1Mb, that is enough, but we should really
	127	* consider fixing the Makefile to put a _raw_ kernel in there !
	128	*/
3cc747e9	129	vmlinux_memsize += ONE_MB;
1da177e4 LT	130	printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux_memsize);
	131	vmlinux.addr = try_claim(vmlinux_memsize);
	132	if (vmlinux.addr == 0) {
	133	printf("Can't allocate memory for kernel image !\n\r");
	134	exit();
	135	}
	136	vmlinuz.addr = (unsigned long)_vmlinux_start;
	137	vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
	138	vmlinux.size = PAGE_ALIGN(vmlinux_filesize);
	139	vmlinux.memsize = vmlinux_memsize;
	140
	141	/*
	142	* Now we try to claim memory for the initrd (and copy it there)
	143	*/
	144	initrd.size = (unsigned long)(_initrd_end - _initrd_start);
	145	initrd.memsize = initrd.size;
	146	if ( initrd.size > 0 ) {
	147	printf("Allocating 0x%lx bytes for initrd ...\n\r", initrd.size);
	148	initrd.addr = try_claim(initrd.size);
	149	if (initrd.addr == 0) {
	150	printf("Can't allocate memory for initial ramdisk !\n\r");
	151	exit();
	152	}
	153	a1 = initrd.addr;
	154	a2 = initrd.size;
b1bdfbd0	155	printf("initial ramdisk moving 0x%lx <- 0x%lx (0x%lx bytes)\n\r",
1da177e4 LT	156	initrd.addr, (unsigned long)_initrd_start, initrd.size);
1da177e4 LT	157	memmove((void )initrd.addr, (void )_initrd_start, initrd.size);
b1bdfbd0	158	printf("initrd head: 0x%lx\n\r", ((unsigned long )initrd.addr));
1da177e4 LT	159	}
	160
	161	/* Eventually gunzip the kernel */
	162	if ((unsigned short )vmlinuz.addr == 0x1f8b) {
	163	int len;
	164	avail_ram = scratch;
	165	begin_avail = avail_high = avail_ram;
	166	end_avail = scratch + sizeof(scratch);
	167	printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
	168	vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
	169	len = vmlinuz.size;
	170	gunzip((void *)vmlinux.addr, vmlinux.size,
	171	(unsigned char *)vmlinuz.addr, &len);
	172	printf("done 0x%lx bytes\n\r", len);
	173	printf("0x%x bytes of heap consumed, max in use 0x%x\n\r",
	174	(unsigned)(avail_high - begin_avail), heap_max);
	175	} else {
	176	memmove((void )vmlinux.addr,(void )vmlinuz.addr,vmlinuz.size);
	177	}
	178
	179	/* Skip over the ELF header */
	180	elf64 = (Elf64_Ehdr *)vmlinux.addr;
	181	if ( elf64->e_ident[EI_MAG0] != ELFMAG0 \|\|
	182	elf64->e_ident[EI_MAG1] != ELFMAG1 \|\|
	183	elf64->e_ident[EI_MAG2] != ELFMAG2 \|\|
	184	elf64->e_ident[EI_MAG3] != ELFMAG3 \|\|
	185	elf64->e_ident[EI_CLASS] != ELFCLASS64 \|\|
	186	elf64->e_ident[EI_DATA] != ELFDATA2MSB \|\|
	187	elf64->e_type != ET_EXEC \|\|
	188	elf64->e_machine != EM_PPC64 )
	189	{
	190	printf("Error: not a valid PPC64 ELF file!\n\r");
	191	exit();
	192	}
	193
	194	elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
	195	(unsigned long)elf64->e_phoff);
	196	for(i=0; i < (unsigned int)elf64->e_phnum ;i++,elf64ph++) {
	197	if (elf64ph->p_type == PT_LOAD && elf64ph->p_offset != 0)
	198	break;
	199	}
	200	#ifdef DEBUG
	201	printf("... skipping 0x%lx bytes of ELF header\n\r",
	202	(unsigned long)elf64ph->p_offset);
	203	#endif
	204	vmlinux.addr += (unsigned long)elf64ph->p_offset;
	205	vmlinux.size -= (unsigned long)elf64ph->p_offset;
	206
	207	flush_cache((void *)vmlinux.addr, vmlinux.size);
	208
1da177e4 LT	209	kernel_entry = (kernel_entry_t)vmlinux.addr;
	210	#ifdef DEBUG
	211	printf( "kernel:\n\r"
	212	" entry addr = 0x%lx\n\r"
	213	" a1 = 0x%lx,\n\r"
	214	" a2 = 0x%lx,\n\r"
	215	" prom = 0x%lx,\n\r"
	216	" bi_recs = 0x%lx,\n\r",
	217	(unsigned long)kernel_entry, a1, a2,
	218	(unsigned long)prom, NULL);
	219	#endif
	220
	221	kernel_entry( a1, a2, prom, NULL );
	222
	223	printf("Error: Linux kernel returned to zImage bootloader!\n\r");
	224
	225	exit();
	226	}
	227
	228	struct memchunk {
	229	unsigned int size;
	230	unsigned int pad;
	231	struct memchunk *next;
	232	};
	233
	234	static struct memchunk *freechunks;
	235
	236	void zalloc(void x, unsigned items, unsigned size)
	237	{
	238	void *p;
	239	struct memchunk *mpp, mp;
	240
	241	size *= items;
	242	size = _ALIGN(size, sizeof(struct memchunk));
	243	heap_use += size;
	244	if (heap_use > heap_max)
	245	heap_max = heap_use;
	246	for (mpp = &freechunks; (mp = *mpp) != 0; mpp = &mp->next) {
	247	if (mp->size == size) {
	248	*mpp = mp->next;
	249	return mp;
	250	}
	251	}
	252	p = avail_ram;
	253	avail_ram += size;
	254	if (avail_ram > avail_high)
	255	avail_high = avail_ram;
	256	if (avail_ram > end_avail) {
	257	printf("oops... out of memory\n\r");
	258	pause();
	259	}
	260	return p;
	261	}
	262
	263	void zfree(void x, void addr, unsigned nb)
	264	{
	265	struct memchunk *mp = addr;
	266
	267	nb = _ALIGN(nb, sizeof(struct memchunk));
	268	heap_use -= nb;
	269	if (avail_ram == addr + nb) {
	270	avail_ram = addr;
	271	return;
	272	}
273	mp->size = nb;
274	mp->next = freechunks;
275	freechunks = mp;
276	}
277
278	#define HEAD_CRC 2
279	#define EXTRA_FIELD 4
280	#define ORIG_NAME 8
281	#define COMMENT 0x10
282	#define RESERVED 0xe0
283
284	#define DEFLATED 8
285
decd300b	286	static void gunzip(void dst, int dstlen, unsigned char src, int *lenp)
1da177e4 LT	287	{
	288	z_stream s;
	289	int r, i, flags;
	290
	291	/* skip header */
	292	i = 10;
	293	flags = src[3];
	294	if (src[2] != DEFLATED \|\| (flags & RESERVED) != 0) {
	295	printf("bad gzipped data\n\r");
	296	exit();
	297	}
	298	if ((flags & EXTRA_FIELD) != 0)
	299	i = 12 + src[10] + (src[11] << 8);
	300	if ((flags & ORIG_NAME) != 0)
	301	while (src[i++] != 0)
	302	;
	303	if ((flags & COMMENT) != 0)
	304	while (src[i++] != 0)
	305	;
	306	if ((flags & HEAD_CRC) != 0)
	307	i += 2;
	308	if (i >= *lenp) {
	309	printf("gunzip: ran out of data in header\n\r");
	310	exit();
	311	}
	312
	313	s.zalloc = zalloc;
	314	s.zfree = zfree;
	315	r = inflateInit2(&s, -MAX_WBITS);
	316	if (r != Z_OK) {
	317	printf("inflateInit2 returned %d\n\r", r);
	318	exit();
	319	}
	320	s.next_in = src + i;
	321	s.avail_in = *lenp - i;
	322	s.next_out = dst;
	323	s.avail_out = dstlen;
	324	r = inflate(&s, Z_FINISH);
	325	if (r != Z_OK && r != Z_STREAM_END) {
	326	printf("inflate returned %d msg: %s\n\r", r, s.msg);
	327	exit();
	328	}
	329	lenp = s.next_out - (unsigned char ) dst;
	330	inflateEnd(&s);
	331	}
	332