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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 
error(const char * msg)28 static inline void error(const char *msg)
29 {
30     fputs(msg, stderr);
31 }
32 
usage(void)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 */
boot_args(char ** args)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 
main(int argc,char * argv[])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 }
175