275 lines
7.2 KiB
C
275 lines
7.2 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 "prom.h"
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#include "zlib.h"
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extern void flush_cache(void *, unsigned long);
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/* Value picked to match that used by yaboot */
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#define PROG_START 0x01400000
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#define RAM_END (512<<20) // Fixme: use OF */
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#define ONE_MB 0x100000
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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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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 char scratch[46912]; /* scratch space for gunzip, from zlib_inflate_workspacesize() */
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static char elfheader[256];
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typedef void (*kernel_entry_t)( unsigned long,
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unsigned long,
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void *,
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void *);
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#undef DEBUG
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static unsigned long claim_base;
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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 unsigned long try_claim(unsigned long size)
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{
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unsigned long addr = 0;
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for(; claim_base < RAM_END; claim_base += ONE_MB) {
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#ifdef DEBUG
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printf(" trying: 0x%08lx\n\r", claim_base);
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#endif
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addr = (unsigned long)claim(claim_base, size, 0);
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if ((void *)addr != (void *)-1)
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break;
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}
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if (addr == 0)
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return 0;
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claim_base = PAGE_ALIGN(claim_base + size);
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return addr;
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}
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void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
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{
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unsigned long i;
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int len;
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kernel_entry_t kernel_entry;
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Elf64_Ehdr *elf64;
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Elf64_Phdr *elf64ph;
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memset(__bss_start, 0, _end - __bss_start);
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prom = (int (*)(void *)) promptr;
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chosen_handle = finddevice("/chosen");
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if (chosen_handle == (void *) -1)
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exit();
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if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4)
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exit();
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stderr = stdout;
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if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
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exit();
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printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r", _start, sp);
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/*
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* The first available claim_base must be above the end of the
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* the loaded kernel wrapper file (_start to _end includes the
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* initrd image if it is present) and rounded up to a nice
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* 1 MB boundary for good measure.
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*/
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claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
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#if defined(PROG_START)
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/*
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* Maintain a "magic" minimum address. This keeps some older
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* firmware platforms running.
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*/
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if (claim_base < PROG_START)
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claim_base = PROG_START;
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#endif
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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, sizeof(elfheader));
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elf64 = (Elf64_Ehdr *)elfheader;
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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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{
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printf("Error: not a valid PPC64 ELF file!\n\r");
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exit();
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}
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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 && elf64ph->p_offset != 0)
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break;
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}
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vmlinux.size = (unsigned long)elf64ph->p_filesz;
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vmlinux.memsize = (unsigned long)elf64ph->p_memsz;
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printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize);
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vmlinux.addr = try_claim(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 we try to claim memory for the initrd (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", initrd.size);
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initrd.addr = try_claim(initrd.size);
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if (initrd.addr == 0) {
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printf("Can't allocate memory for initial ramdisk !\n\r");
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exit();
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}
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a1 = initrd.addr;
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a2 = initrd.size;
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printf("initial ramdisk moving 0x%lx <- 0x%lx (0x%lx bytes)\n\r",
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initrd.addr, (unsigned long)_initrd_start, initrd.size);
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memmove((void *)initrd.addr, (void *)_initrd_start, initrd.size);
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printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd.addr));
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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,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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(unsigned long)elf64ph->p_offset);
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#endif
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vmlinux.addr += (unsigned long)elf64ph->p_offset;
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flush_cache((void *)vmlinux.addr, vmlinux.size);
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kernel_entry = (kernel_entry_t)vmlinux.addr;
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#ifdef DEBUG
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printf( "kernel:\n\r"
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" entry addr = 0x%lx\n\r"
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" a1 = 0x%lx,\n\r"
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" a2 = 0x%lx,\n\r"
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" prom = 0x%lx,\n\r"
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" bi_recs = 0x%lx,\n\r",
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(unsigned long)kernel_entry, a1, a2,
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(unsigned long)prom, NULL);
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#endif
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kernel_entry( a1, a2, prom, NULL );
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printf("Error: Linux kernel returned to zImage bootloader!\n\r");
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exit();
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}
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