arch/ppc64/boot/main.c - maze/linux - Git at Google

 /*
  * 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 "ppc32-types.h"
 #include "zlib.h"
 #include <linux/elf.h>
 #include <linux/string.h>
 #include <asm/processor.h>
 #include <asm/page.h>

 extern void *finddevice(const char *);
 extern int getprop(void *, const char *, void *, int);
 extern void printf(const char *fmt, ...);
 extern int sprintf(char *buf, const char *fmt, ...);
 void gunzip(void *, int, unsigned char *, int *);
 void *claim(unsigned int, unsigned int, unsigned int);
 void flush_cache(void *, unsigned long);
 void pause(void);
 extern void exit(void);

 unsigned long strlen(const char *s);
 void *memmove(void *dest, const void *src, unsigned long n);
 void *memcpy(void *dest, const void *src, unsigned long n);

 /* Value picked to match that used by yaboot */
 #define PROG_START	0x01400000
 #define RAM_END		(256<<20) // Fixme: use OF */

 char *avail_ram;
 char *begin_avail, *end_avail;
 char *avail_high;
 unsigned int heap_use;
 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;
 };
 struct addr_range vmlinux = {0, 0, 0};
 struct addr_range vmlinuz = {0, 0, 0};
 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 *);


 int (*prom)(void *);

 void *chosen_handle;
 void *stdin;
 void *stdout;
 void *stderr;

 #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

 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);
 }
	/*
	* 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 "ppc32-types.h"
	#include "zlib.h"
	#include <linux/elf.h>
	#include <linux/string.h>
	#include <asm/processor.h>
	#include <asm/page.h>

	extern void finddevice(const char );
	extern int getprop(void , const char , void *, int);
	extern void printf(const char *fmt, ...);
	extern int sprintf(char buf, const char fmt, ...);
	void gunzip(void , int, unsigned char , int *);
	void *claim(unsigned int, unsigned int, unsigned int);
	void flush_cache(void *, unsigned long);
	void pause(void);
	extern void exit(void);

	unsigned long strlen(const char *s);
	void memmove(void dest, const void *src, unsigned long n);
	void memcpy(void dest, const void *src, unsigned long n);

	/* Value picked to match that used by yaboot */
	#define PROG_START 0x01400000
	#define RAM_END (256<<20) // Fixme: use OF */

	char *avail_ram;
	char begin_avail, end_avail;
	char *avail_high;
	unsigned int heap_use;
	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;
	};
	struct addr_range vmlinux = {0, 0, 0};
	struct addr_range vmlinuz = {0, 0, 0};
	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 *);


	int (prom)(void );

	void *chosen_handle;
	void *stdin;
	void *stdout;
	void *stderr;

	#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

	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);
	}