e5a2072bd4
This patch adds a reg.h to the zImage code, with common definitions for accessing system registers. For now, this includes functions for retrieving the PVR and the stack pointer. This patch then uses the new reg.h to let start() display the running stack address without having to explicitly pass the stack as a parameter from the asm code. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
303 lines
8.4 KiB
C
303 lines
8.4 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 "ops.h"
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#include "gunzip_util.h"
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#include "flatdevtree.h"
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#include "reg.h"
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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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static struct gunzip_state gzstate;
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struct addr_range {
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void *addr;
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unsigned long size;
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};
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struct elf_info {
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unsigned long loadsize;
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unsigned long memsize;
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unsigned long elfoffset;
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};
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typedef void (*kernel_entry_t)(unsigned long, unsigned long, void *);
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#undef DEBUG
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static int parse_elf64(void *hdr, struct elf_info *info)
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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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info->loadsize = (unsigned long)elf64ph->p_filesz;
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info->memsize = (unsigned long)elf64ph->p_memsz;
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info->elfoffset = (unsigned long)elf64ph->p_offset;
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return 1;
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}
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static int parse_elf32(void *hdr, struct elf_info *info)
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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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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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info->loadsize = elf32ph->p_filesz;
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info->memsize = elf32ph->p_memsz;
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info->elfoffset = elf32ph->p_offset;
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return 1;
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}
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static struct addr_range prep_kernel(void)
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{
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char elfheader[256];
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void *vmlinuz_addr = _vmlinux_start;
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unsigned long vmlinuz_size = _vmlinux_end - _vmlinux_start;
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void *addr = 0;
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struct elf_info ei;
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int len;
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/* gunzip the ELF header of the kernel */
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gunzip_start(&gzstate, vmlinuz_addr, vmlinuz_size);
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gunzip_exactly(&gzstate, elfheader, sizeof(elfheader));
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if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei))
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fatal("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
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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: gzip will expand the kernel
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* text/data, then possible rubbish we don't care about. But
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* the kernel bss must be claimed (it will be zero'd by the
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* kernel itself)
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*/
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printf("Allocating 0x%lx bytes for kernel ...\n\r", ei.memsize);
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if (platform_ops.vmlinux_alloc) {
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addr = platform_ops.vmlinux_alloc(ei.memsize);
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} else {
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if ((unsigned long)_start < ei.memsize)
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fatal("Insufficient memory for kernel at address 0!"
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" (_start=%p)\n\r", _start);
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}
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/* Finally, gunzip the kernel */
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printf("gunzipping (0x%p <- 0x%p:0x%p)...", addr,
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vmlinuz_addr, vmlinuz_addr+vmlinuz_size);
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/* discard up to the actual load data */
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gunzip_discard(&gzstate, ei.elfoffset - sizeof(elfheader));
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len = gunzip_finish(&gzstate, addr, ei.memsize);
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printf("done 0x%x bytes\n\r", len);
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flush_cache(addr, ei.loadsize);
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return (struct addr_range){addr, ei.memsize};
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}
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static struct addr_range prep_initrd(struct addr_range vmlinux,
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unsigned long initrd_addr,
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unsigned long initrd_size)
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{
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void *devp;
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u32 initrd_start, initrd_end;
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/* If we have an image attached to us, it overrides anything
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* supplied by the loader. */
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if (_initrd_end > _initrd_start) {
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printf("Attached initrd image at 0x%p-0x%p\n\r",
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_initrd_start, _initrd_end);
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initrd_addr = (unsigned long)_initrd_start;
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initrd_size = _initrd_end - _initrd_start;
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} else if (initrd_size > 0) {
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printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r",
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initrd_addr, initrd_addr + initrd_size);
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}
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/* If there's no initrd at all, we're done */
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if (! initrd_size)
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return (struct addr_range){0, 0};
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/*
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* If the initrd is too low it will be clobbered when the
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* kernel relocates to its final location. In this case,
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* allocate a safer place and move it.
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*/
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if (initrd_addr < vmlinux.size) {
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void *old_addr = (void *)initrd_addr;
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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(initrd_size);
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if (! initrd_addr)
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fatal("Can't allocate memory for initial "
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"ramdisk !\n\r");
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printf("Relocating initrd 0x%lx <- 0x%p (0x%lx bytes)\n\r",
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initrd_addr, old_addr, initrd_size);
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memmove((void *)initrd_addr, old_addr, initrd_size);
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}
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printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr));
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/* Tell the kernel initrd address via device tree */
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devp = finddevice("/chosen");
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if (! devp)
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fatal("Device tree has no chosen node!\n\r");
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initrd_start = (u32)initrd_addr;
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initrd_end = (u32)initrd_addr + initrd_size;
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setprop(devp, "linux,initrd-start", &initrd_start,
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sizeof(initrd_start));
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setprop(devp, "linux,initrd-end", &initrd_end, sizeof(initrd_end));
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return (struct addr_range){(void *)initrd_addr, initrd_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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struct loader_info loader_info;
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void start(void)
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{
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struct addr_range vmlinux, initrd;
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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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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, get_sp());
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vmlinux = prep_kernel();
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initrd = prep_initrd(vmlinux, loader_info.initrd_addr,
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loader_info.initrd_size);
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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", loader_info.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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kentry((unsigned long)initrd.addr, initrd.size,
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loader_info.promptr);
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/* console closed so printf in fatal below may not work */
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fatal("Error: Linux kernel returned to zImage boot wrapper!\n\r");
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}
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