354 lines
9.5 KiB
C
354 lines
9.5 KiB
C
/*
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* Copyright (C) Paul Mackerras 1997.
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*
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* Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <stdarg.h>
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#include <stddef.h>
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#include "elf.h"
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#include "page.h"
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#include "string.h"
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#include "stdio.h"
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#include "zlib.h"
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#include "ops.h"
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#include "flatdevtree.h"
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extern void flush_cache(void *, unsigned long);
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extern char _start[];
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extern char __bss_start[];
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extern char _end[];
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extern char _vmlinux_start[];
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extern char _vmlinux_end[];
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extern char _initrd_start[];
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extern char _initrd_end[];
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extern char _dtb_start[];
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extern char _dtb_end[];
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struct addr_range {
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unsigned long addr;
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unsigned long size;
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unsigned long memsize;
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};
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static struct addr_range vmlinux;
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static struct addr_range vmlinuz;
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static struct addr_range initrd;
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static unsigned long elfoffset;
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static int is_64bit;
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/* scratch space for gunzip; 46912 is from zlib_inflate_workspacesize() */
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static char scratch[46912];
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static char elfheader[256];
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typedef void (*kernel_entry_t)(unsigned long, unsigned long, void *);
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#undef DEBUG
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#define HEAD_CRC 2
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#define EXTRA_FIELD 4
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#define ORIG_NAME 8
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#define COMMENT 0x10
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#define RESERVED 0xe0
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static void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
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{
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z_stream s;
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int r, i, flags;
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/* skip header */
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i = 10;
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flags = src[3];
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if (src[2] != Z_DEFLATED || (flags & RESERVED) != 0) {
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printf("bad gzipped data\n\r");
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exit();
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}
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if ((flags & EXTRA_FIELD) != 0)
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i = 12 + src[10] + (src[11] << 8);
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if ((flags & ORIG_NAME) != 0)
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while (src[i++] != 0)
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;
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if ((flags & COMMENT) != 0)
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while (src[i++] != 0)
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;
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if ((flags & HEAD_CRC) != 0)
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i += 2;
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if (i >= *lenp) {
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printf("gunzip: ran out of data in header\n\r");
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exit();
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}
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if (zlib_inflate_workspacesize() > sizeof(scratch)) {
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printf("gunzip needs more mem\n");
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exit();
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}
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memset(&s, 0, sizeof(s));
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s.workspace = scratch;
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r = zlib_inflateInit2(&s, -MAX_WBITS);
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if (r != Z_OK) {
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printf("inflateInit2 returned %d\n\r", r);
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exit();
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}
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s.next_in = src + i;
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s.avail_in = *lenp - i;
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s.next_out = dst;
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s.avail_out = dstlen;
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r = zlib_inflate(&s, Z_FULL_FLUSH);
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if (r != Z_OK && r != Z_STREAM_END) {
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printf("inflate returned %d msg: %s\n\r", r, s.msg);
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exit();
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}
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*lenp = s.next_out - (unsigned char *) dst;
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zlib_inflateEnd(&s);
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}
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static int is_elf64(void *hdr)
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{
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Elf64_Ehdr *elf64 = hdr;
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Elf64_Phdr *elf64ph;
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unsigned int i;
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if (!(elf64->e_ident[EI_MAG0] == ELFMAG0 &&
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elf64->e_ident[EI_MAG1] == ELFMAG1 &&
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elf64->e_ident[EI_MAG2] == ELFMAG2 &&
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elf64->e_ident[EI_MAG3] == ELFMAG3 &&
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elf64->e_ident[EI_CLASS] == ELFCLASS64 &&
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elf64->e_ident[EI_DATA] == ELFDATA2MSB &&
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elf64->e_type == ET_EXEC &&
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elf64->e_machine == EM_PPC64))
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return 0;
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elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
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(unsigned long)elf64->e_phoff);
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for (i = 0; i < (unsigned int)elf64->e_phnum; i++, elf64ph++)
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if (elf64ph->p_type == PT_LOAD)
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break;
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if (i >= (unsigned int)elf64->e_phnum)
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return 0;
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elfoffset = (unsigned long)elf64ph->p_offset;
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vmlinux.size = (unsigned long)elf64ph->p_filesz + elfoffset;
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vmlinux.memsize = (unsigned long)elf64ph->p_memsz + elfoffset;
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is_64bit = 1;
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return 1;
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}
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static int is_elf32(void *hdr)
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{
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Elf32_Ehdr *elf32 = hdr;
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Elf32_Phdr *elf32ph;
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unsigned int i;
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if (!(elf32->e_ident[EI_MAG0] == ELFMAG0 &&
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elf32->e_ident[EI_MAG1] == ELFMAG1 &&
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elf32->e_ident[EI_MAG2] == ELFMAG2 &&
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elf32->e_ident[EI_MAG3] == ELFMAG3 &&
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elf32->e_ident[EI_CLASS] == ELFCLASS32 &&
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elf32->e_ident[EI_DATA] == ELFDATA2MSB &&
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elf32->e_type == ET_EXEC &&
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elf32->e_machine == EM_PPC))
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return 0;
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elf32 = (Elf32_Ehdr *)elfheader;
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elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff);
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for (i = 0; i < elf32->e_phnum; i++, elf32ph++)
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if (elf32ph->p_type == PT_LOAD)
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break;
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if (i >= elf32->e_phnum)
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return 0;
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elfoffset = elf32ph->p_offset;
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vmlinux.size = elf32ph->p_filesz + elf32ph->p_offset;
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vmlinux.memsize = elf32ph->p_memsz + elf32ph->p_offset;
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return 1;
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}
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static void prep_kernel(unsigned long a1, unsigned long a2)
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{
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int len;
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vmlinuz.addr = (unsigned long)_vmlinux_start;
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vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
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/* gunzip the ELF header of the kernel */
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if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
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len = vmlinuz.size;
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gunzip(elfheader, sizeof(elfheader),
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(unsigned char *)vmlinuz.addr, &len);
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} else
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memcpy(elfheader, (const void *)vmlinuz.addr,
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sizeof(elfheader));
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if (!is_elf64(elfheader) && !is_elf32(elfheader)) {
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printf("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
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exit();
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}
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if (platform_ops.image_hdr)
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platform_ops.image_hdr(elfheader);
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/* We need to alloc the memsize plus the file offset since gzip
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* will expand the header (file offset), then the kernel, then
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* possible rubbish we don't care about. But the kernel bss must
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* be claimed (it will be zero'd by the kernel itself)
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*/
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printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize);
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vmlinux.addr = (unsigned long)malloc(vmlinux.memsize);
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if (vmlinux.addr == 0) {
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printf("Can't allocate memory for kernel image !\n\r");
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exit();
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}
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/*
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* Now find the initrd
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*
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* First see if we have an image attached to us. If so
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* allocate memory for it and copy it there.
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*/
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initrd.size = (unsigned long)(_initrd_end - _initrd_start);
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initrd.memsize = initrd.size;
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if (initrd.size > 0) {
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printf("Allocating 0x%lx bytes for initrd ...\n\r",
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initrd.size);
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initrd.addr = (unsigned long)malloc((u32)initrd.size);
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if (initrd.addr == 0) {
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printf("Can't allocate memory for initial "
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"ramdisk !\n\r");
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exit();
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}
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printf("initial ramdisk moving 0x%lx <- 0x%lx "
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"(0x%lx bytes)\n\r", initrd.addr,
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(unsigned long)_initrd_start, initrd.size);
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memmove((void *)initrd.addr, (void *)_initrd_start,
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initrd.size);
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printf("initrd head: 0x%lx\n\r",
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*((unsigned long *)initrd.addr));
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} else if (a2 != 0) {
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/* Otherwise, see if yaboot or another loader gave us an initrd */
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initrd.addr = a1;
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initrd.memsize = initrd.size = a2;
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printf("Using loader supplied initrd at 0x%lx (0x%lx bytes)\n\r",
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initrd.addr, initrd.size);
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}
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/* Eventually gunzip the kernel */
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if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
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printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
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vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
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len = vmlinuz.size;
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gunzip((void *)vmlinux.addr, vmlinux.memsize,
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(unsigned char *)vmlinuz.addr, &len);
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printf("done 0x%lx bytes\n\r", len);
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} else {
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memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,
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vmlinuz.size);
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}
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/* Skip over the ELF header */
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#ifdef DEBUG
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printf("... skipping 0x%lx bytes of ELF header\n\r",
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elfoffset);
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#endif
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vmlinux.addr += elfoffset;
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flush_cache((void *)vmlinux.addr, vmlinux.size);
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}
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/* A buffer that may be edited by tools operating on a zImage binary so as to
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* edit the command line passed to vmlinux (by setting /chosen/bootargs).
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* The buffer is put in it's own section so that tools may locate it easier.
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*/
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static char builtin_cmdline[COMMAND_LINE_SIZE]
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__attribute__((__section__("__builtin_cmdline")));
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static void get_cmdline(char *buf, int size)
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{
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void *devp;
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int len = strlen(builtin_cmdline);
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buf[0] = '\0';
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if (len > 0) { /* builtin_cmdline overrides dt's /chosen/bootargs */
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len = min(len, size-1);
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strncpy(buf, builtin_cmdline, len);
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buf[len] = '\0';
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}
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else if ((devp = finddevice("/chosen")))
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getprop(devp, "bootargs", buf, size);
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}
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static void set_cmdline(char *buf)
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{
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void *devp;
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if ((devp = finddevice("/chosen")))
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setprop(devp, "bootargs", buf, strlen(buf) + 1);
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}
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struct platform_ops platform_ops;
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struct dt_ops dt_ops;
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struct console_ops console_ops;
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void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
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{
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kernel_entry_t kentry;
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char cmdline[COMMAND_LINE_SIZE];
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unsigned long ft_addr = 0;
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memset(__bss_start, 0, _end - __bss_start);
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memset(&platform_ops, 0, sizeof(platform_ops));
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memset(&dt_ops, 0, sizeof(dt_ops));
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memset(&console_ops, 0, sizeof(console_ops));
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if (platform_init(promptr, _dtb_start, _dtb_end))
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exit();
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if (console_ops.open && (console_ops.open() < 0))
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exit();
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if (platform_ops.fixups)
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platform_ops.fixups();
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printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
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_start, sp);
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prep_kernel(a1, a2);
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/* If cmdline came from zimage wrapper or if we can edit the one
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* in the dt, print it out and edit it, if possible.
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*/
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if ((strlen(builtin_cmdline) > 0) || console_ops.edit_cmdline) {
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get_cmdline(cmdline, COMMAND_LINE_SIZE);
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printf("\n\rLinux/PowerPC load: %s", cmdline);
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if (console_ops.edit_cmdline)
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console_ops.edit_cmdline(cmdline, COMMAND_LINE_SIZE);
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printf("\n\r");
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set_cmdline(cmdline);
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}
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printf("Finalizing device tree...");
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if (dt_ops.finalize)
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ft_addr = dt_ops.finalize();
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if (ft_addr)
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printf(" flat tree at 0x%lx\n\r", ft_addr);
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else
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printf(" using OF tree (promptr=%p)\n\r", promptr);
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if (console_ops.close)
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console_ops.close();
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kentry = (kernel_entry_t) vmlinux.addr;
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if (ft_addr)
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kentry(ft_addr, 0, NULL);
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else
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/* XXX initrd addr/size should be passed in properties */
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kentry(initrd.addr, initrd.size, promptr);
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/* console closed so printf below may not work */
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printf("Error: Linux kernel returned to zImage boot wrapper!\n\r");
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exit();
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}
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