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/*
* kexec: Linux boots Linux
*
* Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com)
*
* 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 (version 2 of the License).
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#define _GNU_SOURCE
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/fb.h>
#include <unistd.h>
#include <x86/x86-linux.h>
#include "../../kexec.h"
#include "kexec-x86.h"
#include "x86-linux-setup.h"
void init_linux_parameters(struct x86_linux_param_header *real_mode)
{
/* Fill in the values that are usually provided by the kernel. */
/* Boot block magic */
memcpy(real_mode->header_magic, "HdrS", 4);
real_mode->protocol_version = 0x0203;
real_mode->initrd_addr_max = DEFAULT_INITRD_ADDR_MAX;
}
void setup_linux_bootloader_parameters(
struct kexec_info *info, struct x86_linux_param_header *real_mode,
unsigned long real_mode_base, unsigned long cmdline_offset,
const char *cmdline, off_t cmdline_len,
const unsigned char *initrd_buf, off_t initrd_size)
{
char *cmdline_ptr;
unsigned long initrd_base, initrd_addr_max;
/* Say I'm a boot loader */
real_mode->loader_type = LOADER_TYPE_UNKNOWN;
/* No loader flags */
real_mode->loader_flags = 0;
/* Find the maximum initial ramdisk address */
initrd_addr_max = DEFAULT_INITRD_ADDR_MAX;
if (real_mode->protocol_version >= 0x0203) {
initrd_addr_max = real_mode->initrd_addr_max;
dbgprintf("initrd_addr_max is 0x%lx\n", initrd_addr_max);
}
/* Load the initrd if we have one */
if (initrd_buf) {
initrd_base = add_buffer(info,
initrd_buf, initrd_size, initrd_size,
4096, INITRD_BASE, initrd_addr_max, -1);
dbgprintf("Loaded initrd at 0x%lx size 0x%lx\n", initrd_base,
initrd_size);
} else {
initrd_base = 0;
initrd_size = 0;
}
/* Ramdisk address and size */
real_mode->initrd_start = initrd_base;
real_mode->initrd_size = initrd_size;
/* The location of the command line */
/* if (real_mode_base == 0x90000) { */
real_mode->cl_magic = CL_MAGIC_VALUE;
real_mode->cl_offset = cmdline_offset;
/* setup_move_size */
/* } */
if (real_mode->protocol_version >= 0x0202) {
real_mode->cmd_line_ptr = real_mode_base + cmdline_offset;
}
/* Fill in the command line */
if (cmdline_len > COMMAND_LINE_SIZE) {
cmdline_len = COMMAND_LINE_SIZE;
}
cmdline_ptr = ((char *)real_mode) + cmdline_offset;
memcpy(cmdline_ptr, cmdline, cmdline_len);
cmdline_ptr[cmdline_len - 1] = '\0';
}
int setup_linux_vesafb(struct x86_linux_param_header *real_mode)
{
struct fb_fix_screeninfo fix;
struct fb_var_screeninfo var;
static char *magic = "VESA VGA";
int fd;
fd = open("/dev/fb0", O_RDONLY);
if (-1 == fd)
return -1;
if (-1 == ioctl(fd, FBIOGET_FSCREENINFO, &fix))
goto out;
if (-1 == ioctl(fd, FBIOGET_VSCREENINFO, &var))
goto out;
if (0 != strcmp(fix.id, magic))
goto out;
close(fd);
real_mode->orig_video_isVGA = 0x23 /* VIDEO_TYPE_VLFB */;
real_mode->lfb_width = var.xres;
real_mode->lfb_height = var.yres;
real_mode->lfb_depth = var.bits_per_pixel;
real_mode->lfb_base = fix.smem_start;
real_mode->lfb_linelength = fix.line_length;
real_mode->vesapm_seg = 0;
/* FIXME: better get size from the file returned by proc_iomem() */
real_mode->lfb_size = (fix.smem_len + 65535) / 65536;
real_mode->pages = (fix.smem_len + 4095) / 4096;
if (var.bits_per_pixel > 8) {
real_mode->red_pos = var.red.offset;
real_mode->red_size = var.red.length;
real_mode->green_pos = var.green.offset;
real_mode->green_size = var.green.length;
real_mode->blue_pos = var.blue.offset;
real_mode->blue_size = var.blue.length;
real_mode->rsvd_pos = var.transp.offset;
real_mode->rsvd_size = var.transp.length;
}
fprintf(stderr, "%s: %dx%dx%d @ %lx +%x\n", __FUNCTION__,
var.xres, var.yres, var.bits_per_pixel,
fix.smem_start, fix.smem_len);
return 0;
out:
close(fd);
return -1;
}
void setup_linux_system_parameters(struct x86_linux_param_header *real_mode,
unsigned long kexec_flags)
{
/* Fill in information the BIOS would usually provide */
struct memory_range *range;
int i, ranges;
/* Default screen size */
real_mode->orig_x = 0;
real_mode->orig_y = 0;
real_mode->orig_video_page = 0;
real_mode->orig_video_mode = 0;
real_mode->orig_video_cols = 80;
real_mode->orig_video_lines = 25;
real_mode->orig_video_ega_bx = 0;
real_mode->orig_video_isVGA = 1;
real_mode->orig_video_points = 16;
setup_linux_vesafb(real_mode);
/* Fill in the memsize later */
real_mode->ext_mem_k = 0;
real_mode->alt_mem_k = 0;
real_mode->e820_map_nr = 0;
/* Default APM info */
memset(&real_mode->apm_bios_info, 0, sizeof(real_mode->apm_bios_info));
/* Default drive info */
memset(&real_mode->drive_info, 0, sizeof(real_mode->drive_info));
/* Default sysdesc table */
real_mode->sys_desc_table.length = 0;
/* default yes: this can be overridden on the command line */
real_mode->mount_root_rdonly = 0xFFFF;
/* default /dev/hda
* this can be overrident on the command line if necessary.
*/
real_mode->root_dev = (0x3 <<8)| 0;
/* another safe default */
real_mode->aux_device_info = 0;
/* Fill in the memory info */
if ((get_memory_ranges(&range, &ranges, kexec_flags) < 0) || ranges == 0) {
die("Cannot get memory information\n");
}
if (ranges > E820MAX) {
fprintf(stderr, "Too many memory ranges, truncating...\n");
ranges = E820MAX;
}
real_mode->e820_map_nr = ranges;
for(i = 0; i < ranges; i++) {
real_mode->e820_map[i].addr = range[i].start;
real_mode->e820_map[i].size = range[i].end - range[i].start;
switch (range[i].type) {
case RANGE_RAM:
real_mode->e820_map[i].type = E820_RAM;
break;
case RANGE_ACPI:
real_mode->e820_map[i].type = E820_ACPI;
break;
case RANGE_ACPI_NVS:
real_mode->e820_map[i].type = E820_NVS;
break;
default:
case RANGE_RESERVED:
real_mode->e820_map[i].type = E820_RESERVED;
break;
}
if (range[i].type != RANGE_RAM)
continue;
if ((range[i].start <= 0x100000) && range[i].end > 0x100000) {
unsigned long long mem_k = (range[i].end >> 10) - (0x100000 >> 10);
real_mode->ext_mem_k = mem_k;
real_mode->alt_mem_k = mem_k;
if (mem_k > 0xfc00) {
real_mode->ext_mem_k = 0xfc00; /* 64M */
}
if (mem_k > 0xffffffff) {
real_mode->alt_mem_k = 0xffffffff;
}
}
}
}
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