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/* ----------------------------------------------------------------------- *
*
* Copyright 2009 Erwan Velu - All Rights Reserved
*
* 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, Inc., 51 Franklin St, Fifth Floor,
* Boston MA 02110-1301, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
* ifcpu.c
*
*/
#include <alloca.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <cpuid.h>
#include <unistd.h>
#include <syslinux/boot.h>
#include <com32.h>
#include <consoles.h>
static inline void error(const char *msg)
{
fputs(msg, stderr);
}
static void usage(void)
{
error("Run one command if system match some CPU features, another if it doesn't. \n"
"Usage: \n"
" label ifcpu \n"
" com32 ifcpu.c32 \n"
" append <option> <cpu_features> -- boot_entry_1 -- boot_entry_2 \n"
" label boot_entry_1 \n"
" kernel vmlinuz_entry1 \n"
" append ... \n"
" label boot_entry_2 \n"
" kernel vmlinuz_entry2 \n"
" append ... \n"
"\n"
"options could be :\n"
" debug : display some debugging messages \n"
" dry-run : just do the detection, don't boot \n"
"\n"
"cpu_features could be:\n"
" 64 : Processor is x86_64 compatible (lm cpu flag)\n"
" hvm : Processor features hardware virtualization (hvm or svm cpu flag)\n"
" multicore : Processor must be multi-core \n"
" smp : System must be multi-processor \n"
" pae : Processor features Physical Address Extension (PAE)\n"
"\n"
"if you want to match many cpu features, just separate them with a single space.\n");
}
/* XXX: this really should be librarized */
static void boot_args(char **args)
{
int len = 0, a = 0;
char **pp;
const char *p;
char c, *q, *str;
for (pp = args; *pp; pp++)
len += strlen(*pp) + 1;
q = str = alloca(len);
for (pp = args; *pp; pp++) {
p = *pp;
while ((c = *p++))
*q++ = c;
*q++ = ' ';
a = 1;
}
q -= a;
*q = '\0';
if (!str[0])
syslinux_run_default();
else
syslinux_run_command(str);
}
#define show_bool(mybool) mybool ? "found":"not found"
int main(int argc, char *argv[])
{
char **args[3];
int i=0;
int n=0;
bool hardware_matches = true;
bool multicore = false;
bool dryrun = false;
bool debug = false;
s_cpu cpu;
console_ansi_raw();
detect_cpu(&cpu);
/* If no argument got passed, let's show the usage */
if (argc == 1) {
usage();
return -1;
}
for (i = 1; i < argc; i++) {
if (!strcmp(argv[i], "--")) {
argv[i] = NULL;
args[n++] = &argv[i + 1];
} else if (!strcmp(argv[i], "64")) {
if (debug)
printf(" 64bit : %s on this system\n",
show_bool(cpu.flags.lm));
hardware_matches = cpu.flags.lm && hardware_matches;
} else if (!strcmp(argv[i], "pae")) {
if (debug)
printf(" pae : %s on this system\n",
show_bool(cpu.flags.pae));
hardware_matches = cpu.flags.pae && hardware_matches;
} else if (!strcmp(argv[i], "hvm")) {
if (debug)
printf(" hvm : %s on this system\n",
show_bool((cpu.flags.vmx || cpu.flags.svm)));
hardware_matches = (cpu.flags.vmx || cpu.flags.svm)
&& hardware_matches;
} else if (!strcmp(argv[i], "multicore")) {
if (debug)
printf(" multicore : %d cores on this system\n", cpu.num_cores);
if (cpu.num_cores > 1)
multicore = true;
hardware_matches = multicore && hardware_matches;
} else if (!strcmp(argv[i], "smp")) {
if (debug)
printf(" smp : %s on this system\n", show_bool(cpu.flags.smp));
hardware_matches = cpu.flags.smp && hardware_matches;
} else if (!strcmp(argv[i], "dry-run")) {
dryrun = true;
} else if (!strcmp(argv[i], "debug")) {
debug = true;
}
if (n >= 2)
break;
}
while (n < 2) {
args[n] = args[n - 1];
n++;
}
if (debug) {
printf("\nBooting labels are : '%s' or '%s'\n", *args[0], *args[1]);
printf("Hardware requirements%smatch this system, let's booting '%s'\n",
hardware_matches ? " " : " doesn't ",
hardware_matches ? *args[0] : *args[1]);
printf("Sleeping 5sec before booting\n");
if (!dryrun)
sleep(5);
}
if (!dryrun)
boot_args(hardware_matches ? args[0] : args[1]);
else
printf("Dry-run mode, let's exiting\n");
return -1;
}
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