arch/powerpc/boot/main.c - kernel/msm - Gitiles

 /*
  * 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	/* only used on 64-bit systems */
 #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[];

 /* A buffer that may be edited by tools operating on a zImage binary so as to
  * edit the command line passed to vmlinux (by setting /chosen/bootargs).
  * The buffer is put in it's own section so that tools may locate it easier.
  */
 static char builtin_cmdline[512]
 	__attribute__((section("__builtin_cmdline")));


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

 static unsigned long elfoffset;

 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;
 }

 static int is_elf64(void *hdr)
 {
 	Elf64_Ehdr *elf64 = hdr;
 	Elf64_Phdr *elf64ph;
 	unsigned int i;

 	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))
 		return 0;

 	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)
 			break;
 	if (i >= (unsigned int)elf64->e_phnum)
 		return 0;

 	elfoffset = (unsigned long)elf64ph->p_offset;
 	vmlinux.size = (unsigned long)elf64ph->p_filesz + elfoffset;
 	vmlinux.memsize = (unsigned long)elf64ph->p_memsz + elfoffset;

 #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

 	return 1;
 }

 static int is_elf32(void *hdr)
 {
 	Elf32_Ehdr *elf32 = hdr;
 	Elf32_Phdr *elf32ph;
 	unsigned int i;

 	if (!(elf32->e_ident[EI_MAG0]  == ELFMAG0	&&
 	      elf32->e_ident[EI_MAG1]  == ELFMAG1	&&
 	      elf32->e_ident[EI_MAG2]  == ELFMAG2	&&
 	      elf32->e_ident[EI_MAG3]  == ELFMAG3	&&
 	      elf32->e_ident[EI_CLASS] == ELFCLASS32	&&
 	      elf32->e_ident[EI_DATA]  == ELFDATA2MSB	&&
 	      elf32->e_type            == ET_EXEC	&&
 	      elf32->e_machine         == EM_PPC))
 		return 0;

 	elf32 = (Elf32_Ehdr *)elfheader;
 	elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff);
 	for (i = 0; i < elf32->e_phnum; i++, elf32ph++)
 		if (elf32ph->p_type == PT_LOAD)
 			break;
 	if (i >= elf32->e_phnum)
 		return 0;

 	elfoffset = elf32ph->p_offset;
 	vmlinux.size = elf32ph->p_filesz + elf32ph->p_offset;
 	vmlinux.memsize = elf32ph->p_memsz + elf32ph->p_offset;
 	return 1;
 }

 void export_cmdline(void* chosen_handle)
 {
         int len;
         char cmdline[2] = { 0, 0 };

 	if (builtin_cmdline[0] == 0)
 		return;

         len = getprop(chosen_handle, "bootargs", cmdline, sizeof(cmdline));
         if (len > 0 && cmdline[0] != 0)
 		return;

 	setprop(chosen_handle, "bootargs", builtin_cmdline,
 		strlen(builtin_cmdline) + 1);
 }


 void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
 {
 	int len;
 	kernel_entry_t kernel_entry;

 	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();

 	printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r", _start, sp);

 	/*
 	 * 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);

 	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));

 	if (!is_elf64(elfheader) && !is_elf32(elfheader)) {
 		printf("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
 		exit();
 	}

 	/* We need to claim the memsize plus the file offset since gzip
 	 * will expand the header (file offset), then the kernel, then
 	 * possible rubbish we don't care about. But the kernel bss must
 	 * be claimed (it will be zero'd by the kernel itself)
 	 */
 	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);
 	}

 	export_cmdline(chosen_handle);

 	/* Skip over the ELF header */
 #ifdef DEBUG
 	printf("... skipping 0x%lx bytes of ELF header\n\r",
 			elfoffset);
 #endif
 	vmlinux.addr += elfoffset;

 	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();
 }
	/*
	* 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 /* only used on 64-bit systems */
	#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[];

	/* A buffer that may be edited by tools operating on a zImage binary so as to
	* edit the command line passed to vmlinux (by setting /chosen/bootargs).
	* The buffer is put in it's own section so that tools may locate it easier.
	*/
	static char builtin_cmdline[512]
	__attribute__((section("__builtin_cmdline")));


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

	static unsigned long elfoffset;

	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;
	}

	static int is_elf64(void *hdr)
	{
	Elf64_Ehdr *elf64 = hdr;
	Elf64_Phdr *elf64ph;
	unsigned int i;

	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))
	return 0;

	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)
	break;
	if (i >= (unsigned int)elf64->e_phnum)
	return 0;

	elfoffset = (unsigned long)elf64ph->p_offset;
	vmlinux.size = (unsigned long)elf64ph->p_filesz + elfoffset;
	vmlinux.memsize = (unsigned long)elf64ph->p_memsz + elfoffset;

	#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

	return 1;
	}

	static int is_elf32(void *hdr)
	{
	Elf32_Ehdr *elf32 = hdr;
	Elf32_Phdr *elf32ph;
	unsigned int i;

	if (!(elf32->e_ident[EI_MAG0] == ELFMAG0 &&
	elf32->e_ident[EI_MAG1] == ELFMAG1 &&
	elf32->e_ident[EI_MAG2] == ELFMAG2 &&
	elf32->e_ident[EI_MAG3] == ELFMAG3 &&
	elf32->e_ident[EI_CLASS] == ELFCLASS32 &&
	elf32->e_ident[EI_DATA] == ELFDATA2MSB &&
	elf32->e_type == ET_EXEC &&
	elf32->e_machine == EM_PPC))
	return 0;

	elf32 = (Elf32_Ehdr *)elfheader;
	elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff);
	for (i = 0; i < elf32->e_phnum; i++, elf32ph++)
	if (elf32ph->p_type == PT_LOAD)
	break;
	if (i >= elf32->e_phnum)
	return 0;

	elfoffset = elf32ph->p_offset;
	vmlinux.size = elf32ph->p_filesz + elf32ph->p_offset;
	vmlinux.memsize = elf32ph->p_memsz + elf32ph->p_offset;
	return 1;
	}

	void export_cmdline(void* chosen_handle)
	{
	int len;
	char cmdline[2] = { 0, 0 };

	if (builtin_cmdline[0] == 0)
	return;

	len = getprop(chosen_handle, "bootargs", cmdline, sizeof(cmdline));
	if (len > 0 && cmdline[0] != 0)
	return;

	setprop(chosen_handle, "bootargs", builtin_cmdline,
	strlen(builtin_cmdline) + 1);
	}


	void start(unsigned long a1, unsigned long a2, void promptr, void sp)
	{
	int len;
	kernel_entry_t kernel_entry;

	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();

	printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r", _start, sp);

	/*
	* 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);

	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));

	if (!is_elf64(elfheader) && !is_elf32(elfheader)) {
	printf("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
	exit();
	}

	/* We need to claim the memsize plus the file offset since gzip
	* will expand the header (file offset), then the kernel, then
	* possible rubbish we don't care about. But the kernel bss must
	* be claimed (it will be zero'd by the kernel itself)
	*/
	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);
	}

	export_cmdline(chosen_handle);

	/* Skip over the ELF header */
	#ifdef DEBUG
	printf("... skipping 0x%lx bytes of ELF header\n\r",
	elfoffset);
	#endif
	vmlinux.addr += elfoffset;

	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();
	}