219 lines
6.4 KiB
C
219 lines
6.4 KiB
C
/*
|
|
* 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 "ops.h"
|
|
#include "gunzip_util.h"
|
|
#include "flatdevtree.h"
|
|
#include "reg.h"
|
|
|
|
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[];
|
|
extern char _dtb_start[];
|
|
extern char _dtb_end[];
|
|
|
|
static struct gunzip_state gzstate;
|
|
|
|
struct addr_range {
|
|
void *addr;
|
|
unsigned long size;
|
|
};
|
|
|
|
#undef DEBUG
|
|
|
|
static struct addr_range prep_kernel(void)
|
|
{
|
|
char elfheader[256];
|
|
void *vmlinuz_addr = _vmlinux_start;
|
|
unsigned long vmlinuz_size = _vmlinux_end - _vmlinux_start;
|
|
void *addr = 0;
|
|
struct elf_info ei;
|
|
int len;
|
|
|
|
/* gunzip the ELF header of the kernel */
|
|
gunzip_start(&gzstate, vmlinuz_addr, vmlinuz_size);
|
|
gunzip_exactly(&gzstate, elfheader, sizeof(elfheader));
|
|
|
|
if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei))
|
|
fatal("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
|
|
|
|
if (platform_ops.image_hdr)
|
|
platform_ops.image_hdr(elfheader);
|
|
|
|
/* We need to alloc the memsize: gzip will expand the kernel
|
|
* text/data, 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", ei.memsize);
|
|
|
|
if (platform_ops.vmlinux_alloc) {
|
|
addr = platform_ops.vmlinux_alloc(ei.memsize);
|
|
} else {
|
|
if ((unsigned long)_start < ei.memsize)
|
|
fatal("Insufficient memory for kernel at address 0!"
|
|
" (_start=%p)\n\r", _start);
|
|
}
|
|
|
|
/* Finally, gunzip the kernel */
|
|
printf("gunzipping (0x%p <- 0x%p:0x%p)...", addr,
|
|
vmlinuz_addr, vmlinuz_addr+vmlinuz_size);
|
|
/* discard up to the actual load data */
|
|
gunzip_discard(&gzstate, ei.elfoffset - sizeof(elfheader));
|
|
len = gunzip_finish(&gzstate, addr, ei.loadsize);
|
|
if (len != ei.loadsize)
|
|
fatal("ran out of data! only got 0x%x of 0x%lx bytes.\n\r",
|
|
len, ei.loadsize);
|
|
printf("done 0x%x bytes\n\r", len);
|
|
|
|
flush_cache(addr, ei.loadsize);
|
|
|
|
return (struct addr_range){addr, ei.memsize};
|
|
}
|
|
|
|
static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen,
|
|
unsigned long initrd_addr,
|
|
unsigned long initrd_size)
|
|
{
|
|
/* If we have an image attached to us, it overrides anything
|
|
* supplied by the loader. */
|
|
if (_initrd_end > _initrd_start) {
|
|
printf("Attached initrd image at 0x%p-0x%p\n\r",
|
|
_initrd_start, _initrd_end);
|
|
initrd_addr = (unsigned long)_initrd_start;
|
|
initrd_size = _initrd_end - _initrd_start;
|
|
} else if (initrd_size > 0) {
|
|
printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r",
|
|
initrd_addr, initrd_addr + initrd_size);
|
|
}
|
|
|
|
/* If there's no initrd at all, we're done */
|
|
if (! initrd_size)
|
|
return (struct addr_range){0, 0};
|
|
|
|
/*
|
|
* If the initrd is too low it will be clobbered when the
|
|
* kernel relocates to its final location. In this case,
|
|
* allocate a safer place and move it.
|
|
*/
|
|
if (initrd_addr < vmlinux.size) {
|
|
void *old_addr = (void *)initrd_addr;
|
|
|
|
printf("Allocating 0x%lx bytes for initrd ...\n\r",
|
|
initrd_size);
|
|
initrd_addr = (unsigned long)malloc(initrd_size);
|
|
if (! initrd_addr)
|
|
fatal("Can't allocate memory for initial "
|
|
"ramdisk !\n\r");
|
|
printf("Relocating initrd 0x%lx <- 0x%p (0x%lx bytes)\n\r",
|
|
initrd_addr, old_addr, initrd_size);
|
|
memmove((void *)initrd_addr, old_addr, initrd_size);
|
|
}
|
|
|
|
printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr));
|
|
|
|
/* Tell the kernel initrd address via device tree */
|
|
setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr));
|
|
setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size));
|
|
|
|
return (struct addr_range){(void *)initrd_addr, initrd_size};
|
|
}
|
|
|
|
/* 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 cmdline[COMMAND_LINE_SIZE]
|
|
__attribute__((__section__("__builtin_cmdline")));
|
|
|
|
static void prep_cmdline(void *chosen)
|
|
{
|
|
if (cmdline[0] == '\0')
|
|
getprop(chosen, "bootargs", cmdline, COMMAND_LINE_SIZE-1);
|
|
|
|
printf("\n\rLinux/PowerPC load: %s", cmdline);
|
|
/* If possible, edit the command line */
|
|
if (console_ops.edit_cmdline)
|
|
console_ops.edit_cmdline(cmdline, COMMAND_LINE_SIZE);
|
|
printf("\n\r");
|
|
|
|
/* Put the command line back into the devtree for the kernel */
|
|
setprop_str(chosen, "bootargs", cmdline);
|
|
}
|
|
|
|
struct platform_ops platform_ops;
|
|
struct dt_ops dt_ops;
|
|
struct console_ops console_ops;
|
|
struct loader_info loader_info;
|
|
|
|
void start(void)
|
|
{
|
|
struct addr_range vmlinux, initrd;
|
|
kernel_entry_t kentry;
|
|
unsigned long ft_addr = 0;
|
|
void *chosen;
|
|
|
|
/* Do this first, because malloc() could clobber the loader's
|
|
* command line. Only use the loader command line if a
|
|
* built-in command line wasn't set by an external tool */
|
|
if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0'))
|
|
memmove(cmdline, loader_info.cmdline,
|
|
min(loader_info.cmdline_len, COMMAND_LINE_SIZE-1));
|
|
|
|
if (console_ops.open && (console_ops.open() < 0))
|
|
exit();
|
|
if (platform_ops.fixups)
|
|
platform_ops.fixups();
|
|
|
|
printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
|
|
_start, get_sp());
|
|
|
|
/* Ensure that the device tree has a /chosen node */
|
|
chosen = finddevice("/chosen");
|
|
if (!chosen)
|
|
chosen = create_node(NULL, "chosen");
|
|
|
|
vmlinux = prep_kernel();
|
|
initrd = prep_initrd(vmlinux, chosen,
|
|
loader_info.initrd_addr, loader_info.initrd_size);
|
|
prep_cmdline(chosen);
|
|
|
|
printf("Finalizing device tree...");
|
|
if (dt_ops.finalize)
|
|
ft_addr = dt_ops.finalize();
|
|
if (ft_addr)
|
|
printf(" flat tree at 0x%lx\n\r", ft_addr);
|
|
else
|
|
printf(" using OF tree (promptr=%p)\n\r", loader_info.promptr);
|
|
|
|
if (console_ops.close)
|
|
console_ops.close();
|
|
|
|
kentry = (kernel_entry_t) vmlinux.addr;
|
|
if (ft_addr)
|
|
kentry(ft_addr, 0, NULL);
|
|
else
|
|
kentry((unsigned long)initrd.addr, initrd.size,
|
|
loader_info.promptr);
|
|
|
|
/* console closed so printf in fatal below may not work */
|
|
fatal("Error: Linux kernel returned to zImage boot wrapper!\n\r");
|
|
}
|