218 lines
6.5 KiB
C
218 lines
6.5 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 "ops.h"
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#include "gunzip_util.h"
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#include "reg.h"
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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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#undef DEBUG
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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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/*
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* Check if the kernel image (without bss) would overwrite the
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* bootwrapper. The device tree has been moved in fdt_init()
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* to an area allocated with malloc() (somewhere past _end).
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*/
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if ((unsigned long)_start < ei.loadsize)
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fatal("Insufficient memory for kernel at address 0!"
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" (_start=%p, uncompressed size=%08lx)\n\r",
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_start, ei.loadsize);
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if ((unsigned long)_end < ei.memsize)
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fatal("The final kernel image would overwrite the "
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"device tree\n\r");
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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.loadsize);
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if (len != ei.loadsize)
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fatal("ran out of data! only got 0x%x of 0x%lx bytes.\n\r",
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len, ei.loadsize);
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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, void *chosen,
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unsigned long initrd_addr,
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unsigned long initrd_size)
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{
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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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setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr));
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setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size));
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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 cmdline[COMMAND_LINE_SIZE]
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__attribute__((__section__("__builtin_cmdline")));
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static void prep_cmdline(void *chosen)
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{
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if (cmdline[0] == '\0')
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getprop(chosen, "bootargs", cmdline, COMMAND_LINE_SIZE-1);
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printf("\n\rLinux/PowerPC load: %s", cmdline);
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/* If possible, edit the command line */
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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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/* Put the command line back into the devtree for the kernel */
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setprop_str(chosen, "bootargs", cmdline);
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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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unsigned long ft_addr = 0;
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void *chosen;
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/* Do this first, because malloc() could clobber the loader's
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* command line. Only use the loader command line if a
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* built-in command line wasn't set by an external tool */
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if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0'))
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memmove(cmdline, loader_info.cmdline,
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min(loader_info.cmdline_len, COMMAND_LINE_SIZE-1));
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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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/* Ensure that the device tree has a /chosen node */
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chosen = finddevice("/chosen");
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if (!chosen)
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chosen = create_node(NULL, "chosen");
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vmlinux = prep_kernel();
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initrd = prep_initrd(vmlinux, chosen,
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loader_info.initrd_addr, loader_info.initrd_size);
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prep_cmdline(chosen);
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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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