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/*
* cbfs-payload-linux
*
* Copyright (C) 2013 Patrick Georgi <patrick@georgi-clan.de>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "common.h"
#include "cbfs.h"
#include "linux.h"
/* TODO:
* handle special arguments
* mem= argument - only affects loading decisions (kernel + initrd), not e820 -> build time
* vga= argument (FILO ignores this)
* add support for more parameters to trampoline:
* alt_mem_k, ext_mem_k (not strictly necessary since e820 takes precedence)
* framebuffer/console values
*
* larger work:
* is compress() safe to use in a size constrained buffer? ie. do(es) the
* compression algorithm(s) stop once the compression result reaches input
* size (ie. incompressible data)?
*/
int parse_bzImage_to_payload(const struct buffer *input,
struct buffer *output, const char *initrd_name,
char *cmdline, comp_algo algo)
{
int cur_len = 0;
int num_segments = 3; /* parameter block, real kernel, and trampoline */
comp_func_ptr compress = compression_function(algo);
if (!compress)
return -1;
unsigned int initrd_base = 64*1024*1024;
unsigned int initrd_size = 0;
void *initrd_data = NULL;
if (initrd_name != NULL) {
/* TODO: load initrd, set initrd_size */
num_segments++;
FILE *initrd_file = fopen(initrd_name, "rb");
if (!initrd_file) {
ERROR("could not open initrd.\n");
return -1;
}
fseek(initrd_file, 0, SEEK_END);
initrd_size = ftell(initrd_file);
fseek(initrd_file, 0, SEEK_SET);
initrd_data = malloc(initrd_size);
if (!initrd_data) {
ERROR("could not allocate memory for initrd.\n");
return -1;
}
if (fread(initrd_data, initrd_size, 1, initrd_file) != 1) {
ERROR("could not load initrd.\n");
return -1;
}
fclose(initrd_file);
}
unsigned int cmdline_size = 0;
if (cmdline != NULL) {
num_segments++;
cmdline_size = strlen(cmdline) + 1;
}
struct linux_header *hdr = (struct linux_header *)input->data;
unsigned int setup_size = 4 * 512;
if (hdr->setup_sects != 0) {
setup_size = (hdr->setup_sects + 1) * 512;
}
/* Setup parameter block. Imitate FILO. */
struct linux_params params;
params.mount_root_rdonly = hdr->root_flags;
params.orig_root_dev = hdr->root_dev;
/* Sensible video defaults. Might be overridden on runtime by coreboot tables. */
params.orig_video_mode = 3;
params.orig_video_cols = 80;
params.orig_video_lines = 25;
params.orig_video_isVGA = 1;
params.orig_video_points = 16;
params.loader_type = 0xff; /* Unregistered Linux loader */
if (cmdline != NULL) {
if (hdr->protocol_version < 0x202) {
params.cl_magic = CL_MAGIC_VALUE;
params.cl_offset = COMMAND_LINE_LOC - LINUX_PARAM_LOC;
} else {
params.cmd_line_ptr = COMMAND_LINE_LOC;
}
}
unsigned long kernel_base = 0x100000;
if ((hdr->protocol_version >= 0x200) && (!hdr->loadflags & 1)) {
kernel_base = 0x1000; /* zImage kernel */
}
/* kernel prefers an address, so listen */
if ((hdr->protocol_version >= 0x20a) && (!(hdr->pref_address >> 32))) {
kernel_base = hdr->pref_address;
}
if (hdr->protocol_version >= 0x205) {
params.relocatable_kernel = hdr->relocatable_kernel;
params.kernel_alignment = hdr->kernel_alignment;
if (hdr->relocatable_kernel != 0) {
/* 16 MB should be way outside coreboot's playground,
* so if possible (relocatable kernel) use that to
* avoid a trampoline copy. */
kernel_base = ALIGN(16*1024*1024, params.kernel_alignment);
}
}
/* We have a trampoline and use that, but it can simply use
* this information for its jump to real Linux. */
params.kernel_start = kernel_base;
void *kernel_data = input->data + setup_size;
unsigned int kernel_size = input->size - setup_size;
if (initrd_data != NULL) {
/* TODO: this is a bit of a hack. Linux recommends to store
* initrd near to end-of-mem, but that's hard to do on build
* time. It definitely fails to read the image if it's too
* close to the kernel, so give it some room.
*/
initrd_base = ALIGN(kernel_base + kernel_size, 16*1024*1024);
params.initrd_start = initrd_base;
params.initrd_size = initrd_size;
}
struct cbfs_payload_segment *segs;
unsigned long doffset = (num_segments + 1) * sizeof(*segs);
/* Allocate a block of memory to store the data in */
int isize = sizeof(params) + kernel_size + cmdline_size + initrd_size;
if (buffer_create(output, doffset + isize, input->name) != 0)
return -1;
memset(output->data, 0, output->size);
segs = (struct cbfs_payload_segment *)output->data;
/* parameter block */
segs[0].type = PAYLOAD_SEGMENT_DATA;
segs[0].load_addr = htonll(LINUX_PARAM_LOC);
segs[0].mem_len = htonl(sizeof(params));
segs[0].offset = htonl(doffset);
compress((void*)¶ms, sizeof(params), output->data + doffset, &cur_len);
segs[0].compression = htonl(algo);
segs[0].len = htonl(cur_len);
doffset += cur_len;
/* code block */
segs[1].type = PAYLOAD_SEGMENT_CODE;
segs[1].load_addr = htonll(kernel_base);
segs[1].mem_len = htonl(kernel_size);
segs[1].offset = htonl(doffset);
compress(kernel_data, kernel_size, output->data + doffset, &cur_len);
segs[1].compression = htonl(algo);
segs[1].len = htonl(cur_len);
doffset += cur_len;
/* trampoline */
extern void *trampoline_start;
extern long trampoline_size;
unsigned int entrypoint = 0x40000; /* TODO: any better place? */
segs[2].type = PAYLOAD_SEGMENT_CODE;
segs[2].load_addr = htonll(entrypoint);
segs[2].mem_len = htonl(trampoline_size);
segs[2].offset = htonl(doffset);
compress(trampoline_start, trampoline_size, output->data + doffset, &cur_len);
segs[2].compression = htonl(algo);
segs[2].len = htonl(cur_len);
doffset += cur_len;
if (cmdline_size > 0) {
/* command line block */
segs[3].type = PAYLOAD_SEGMENT_DATA;
segs[3].load_addr = htonll(COMMAND_LINE_LOC);
segs[3].mem_len = htonl(cmdline_size);
segs[3].offset = htonl(doffset);
compress(cmdline, cmdline_size, output->data + doffset, &cur_len);
segs[3].compression = htonl(algo);
segs[3].len = htonl(cur_len);
doffset += cur_len;
}
if (initrd_size > 0) {
/* setup block */
segs[num_segments-1].type = PAYLOAD_SEGMENT_DATA;
segs[num_segments-1].load_addr = htonll(initrd_base);
segs[num_segments-1].mem_len = htonl(initrd_size);
segs[num_segments-1].offset = htonl(doffset);
compress(initrd_data, initrd_size, output->data + doffset, &cur_len);
segs[num_segments-1].compression = htonl(algo);
segs[num_segments-1].len = htonl(cur_len);
doffset += cur_len;
}
/* prepare entry point segment */
segs[num_segments].type = PAYLOAD_SEGMENT_ENTRY;
segs[num_segments].load_addr = htonll(entrypoint);
output->size = doffset;
return 0;
}
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