79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/* SPDX-FileCopyrightText: 2023 Richard Masters <grick23@gmail.com> */
|
|
/* SPDX-License-Identifier: MIT */
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <sys/reboot.h>
|
|
#include <sys/stat.h>
|
|
#include <time.h>
|
|
|
|
int append_file(FILE *dst_file, char *src_file_name);
|
|
|
|
|
|
int main(int argc, char **argv) {
|
|
char *ramdrive_file_name, *kernel_file_name, *initramfs_file_name;
|
|
FILE *ramdrive_file;
|
|
struct stat stats;
|
|
|
|
if (argc < 3) {
|
|
puts("Usage: fiwix-kexec-linux <ram-drive-name> <kernel-file-name> <initramfs-file-name>");
|
|
exit(1);
|
|
}
|
|
|
|
ramdrive_file_name = argv[1];
|
|
kernel_file_name = argv[2];
|
|
initramfs_file_name = argv[3];
|
|
|
|
|
|
ramdrive_file = fopen(ramdrive_file_name, "wb");
|
|
|
|
/* Write length of kernel */
|
|
if (stat(kernel_file_name, &stats) == 0) {
|
|
fwrite(&stats.st_size, 4, 1, ramdrive_file);
|
|
} else {
|
|
fprintf(stderr, "Cannot stat kernel file '%s'\n", kernel_file_name);
|
|
exit(1);
|
|
}
|
|
|
|
/* Write length of initramfs */
|
|
if (stat(initramfs_file_name, &stats) == 0) {
|
|
fwrite(&stats.st_size, 4, 1, ramdrive_file);
|
|
} else {
|
|
fprintf(stderr, "Cannot stat initramfs file '%s'\n", initramfs_file_name);
|
|
exit(1);
|
|
}
|
|
|
|
if (append_file(ramdrive_file, kernel_file_name)) {
|
|
fprintf(stderr, "Cannot append kernel '%s'\n", kernel_file_name);
|
|
exit(1);
|
|
}
|
|
if (append_file(ramdrive_file, initramfs_file_name)) {
|
|
fprintf(stderr, "Cannot append initramfs '%s'\n", initramfs_file_name);
|
|
exit(1);
|
|
}
|
|
fclose(ramdrive_file);
|
|
|
|
/* Flush ram drive writes to device */
|
|
sync();
|
|
|
|
/* Perform syscall reboot to initiate kexec */
|
|
reboot(RB_HALT_SYSTEM);
|
|
}
|
|
|
|
int append_file(FILE *dst_file, char *src_file_name) {
|
|
FILE *src_file;
|
|
char buff[BUFSIZ];
|
|
size_t n;
|
|
|
|
if (src_file = fopen(src_file_name, "rb")) {
|
|
while ((n = fread(buff, 1, BUFSIZ, src_file)) != 0) {
|
|
fwrite(buff, 1, n, dst_file );
|
|
}
|
|
fclose(src_file);
|
|
return 0;
|
|
} else {
|
|
printf("Cannot open file '%s'\n", src_file_name);
|
|
return 1;
|
|
}
|
|
}
|