com32/modules/ifcpu.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2009 Erwan Velu - All Rights Reserved
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
   8  *   Boston MA 02110-1301, USA; either version 2 of the License, or
   9  *   (at your option) any later version; incorporated herein by reference.
  10  *
  11  * ----------------------------------------------------------------------- */
  12
  13 /*
  14  * ifcpu.c
  15  *
  16  */
  17
  18 #include <alloca.h>
  19 #include <stdlib.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <cpuid.h>
  23 #include <unistd.h>
  24 #include <syslinux/boot.h>
  25 #include <com32.h>
  26 #include <consoles.h>
  27
  28 static inline void error(const char *msg)
  29 {
  30     fputs(msg, stderr);
  31 }
  32
  33 static void usage(void)
  34 {
  35  error("Run one command if system match some CPU features, another if it doesn't. \n"
  36  "Usage: \n"
  37  "   label ifcpu \n"
  38  "       com32 ifcpu.c32 \n"
  39  "       append <option> <cpu_features> -- boot_entry_1 -- boot_entry_2 \n"
  40  "   label boot_entry_1 \n"
  41  "        kernel vmlinuz_entry1 \n"
  42  "        append ... \n"
  43  "   label boot_entry_2 \n"
  44  "       kernel vmlinuz_entry2 \n"
  45  "       append ... \n"
  46  "\n"
  47  "options could be :\n"
  48  "   debug     : display some debugging messages \n"
  49  "   dry-run   : just do the detection, don't boot \n"
  50  "\n"
  51  "cpu_features could be:\n"
  52  "   64         : Processor is x86_64 compatible (lm cpu flag)\n"
  53  "   hvm        : Processor features hardware virtualization (hvm or svm cpu flag)\n"
  54  "   multicore  : Processor must be multi-core \n"
  55  "   smp        : System must be multi-processor \n"
  56  "   pae        : Processor features Physical Address Extension (PAE)\n"
  57  "   hypervisor : Processor is running under an hypervisor\n"
  58  "\n"
  59  "if you want to match many cpu features, just separate them with a single space.\n");
  60 }
  61
  62 /* XXX: this really should be librarized */
  63 static void boot_args(char **args)
  64 {
  65     int len = 0, a = 0;
  66     char **pp;
  67     const char *p;
  68     char c, *q, *str;
  69
  70     for (pp = args; *pp; pp++)
  71         len += strlen(*pp) + 1;
  72
  73     q = str = alloca(len);
  74     for (pp = args; *pp; pp++) {
  75         p = *pp;
  76         while ((c = *p++))
  77             *q++ = c;
  78         *q++ = ' ';
  79         a = 1;
  80     }
  81     q -= a;
  82     *q = '\0';
  83
  84     if (!str[0])
  85         syslinux_run_default();
  86     else
  87         syslinux_run_command(str);
  88 }
  89
  90 #define show_bool(mybool) mybool ? "found":"not found"
  91
  92 int main(int argc, char *argv[])
  93 {
  94     char **args[3];
  95     int i=0;
  96     int n=0;
  97     bool hardware_matches = true;
  98     bool multicore = false;
  99     bool dryrun = false;
 100     bool debug = false;
 101
 102     s_cpu cpu;
 103     console_ansi_raw();
 104     detect_cpu(&cpu);
 105
 106     /* If no argument got passed, let's show the usage */
 107     if (argc == 1) {
 108             usage();
 109             return -1;
 110     }
 111
 112     for (i = 1; i < argc; i++) {
 113         if (!strcmp(argv[i], "--")) {
 114             argv[i] = NULL;
 115             args[n++] = &argv[i + 1];
 116         } else if (!strcmp(argv[i], "64")) {
 117             if (debug)
 118                 printf(" 64bit      : %s on this system\n",
 119                        show_bool(cpu.flags.lm));
 120             hardware_matches = cpu.flags.lm && hardware_matches;
 121         } else if (!strcmp(argv[i], "pae")) {
 122             if (debug)
 123                 printf(" pae        : %s on this system\n",
 124                        show_bool(cpu.flags.pae));
 125             hardware_matches = cpu.flags.pae && hardware_matches;
 126         } else if (!strcmp(argv[i], "hvm")) {
 127             if (debug)
 128                 printf(" hvm        : %s on this system\n",
 129                        show_bool((cpu.flags.vmx || cpu.flags.svm)));
 130             hardware_matches = (cpu.flags.vmx || cpu.flags.svm)
 131                 && hardware_matches;
 132         } else if (!strcmp(argv[i], "multicore")) {
 133             if (debug)
 134                 printf(" multicore  : %d cores on this system\n", cpu.num_cores);
 135             if (cpu.num_cores > 1)
 136                 multicore = true;
 137             hardware_matches = multicore && hardware_matches;
 138         } else if (!strcmp(argv[i], "smp")) {
 139             if (debug)
 140                 printf(" smp        : %s on this system\n", show_bool(cpu.flags.smp));
 141             hardware_matches = cpu.flags.smp && hardware_matches;
 142         } else if (!strcmp(argv[i], "hypervisor")) {
 143             if (debug)
 144                 printf(" hypervisor : %s on this system\n", show_bool(cpu.flags.hypervisor));
 145             hardware_matches = cpu.flags.hypervisor && hardware_matches;
 146         } else if (!strcmp(argv[i], "dry-run")) {
 147             dryrun = true;
 148         } else if (!strcmp(argv[i], "debug")) {
 149             debug = true;
 150         }
 151         if (n >= 2)
 152             break;
 153     }
 154     while (n < 2) {
 155         args[n] = args[n - 1];
 156         n++;
 157     }
 158     if (debug) {
 159         printf("\nBooting labels are : '%s' or '%s'\n", *args[0], *args[1]);
 160         printf("Hardware requirements%smatch this system, let's booting '%s'\n",
 161                hardware_matches ? " " : " doesn't ",
 162                hardware_matches ? *args[0] : *args[1]);
 163         printf("Sleeping 5sec before booting\n");
 164         if (!dryrun)
 165             sleep(5);
 166     }
 167
 168     if (!dryrun)
 169         boot_args(hardware_matches ? args[0] : args[1]);
 170     else
 171         printf("Dry-run mode, let's exiting\n");
 172
 173     return -1;
 174 }