1 /* $OpenBSD: machdep.c,v 1.41 2024/06/26 01:40:49 jsg Exp $ */
2
3 /*
4 * Copyright (c) 2004 Tom Cosgrove
5 * Copyright (c) 1997-1999 Michael Shalayeff
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27 * THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "libsa.h"
31 #include "biosdev.h"
32 #include <machine/apmvar.h>
33 #include <machine/biosvar.h>
34 #include <machine/psl.h>
35 #include <machine/specialreg.h>
36 #include <machine/vmmvar.h>
37
38 #ifdef EFIBOOT
39 #include "efiboot.h"
40 #endif
41
42 volatile struct BIOS_regs BIOS_regs;
43
44 #if defined(DEBUG)
45 #define CKPT(c) (*(u_int16_t*)0xb8148 = 0x4700 + (c))
46 #else
47 #define CKPT(c) /* c */
48 #endif
49
50 const char *vmm_hv_signature = VMM_HV_SIGNATURE;
51
52 void
machdep(void)53 machdep(void)
54 {
55 int i, j, vmm = 0, psl_check;
56 struct i386_boot_probes *pr;
57 uint32_t dummy, ebx, ecx, edx;
58 dev_t dev;
59
60 /*
61 * The list of probe routines is now in conf.c.
62 */
63 for (i = 0; i < nibprobes; i++) {
64 pr = &probe_list[i];
65 if (pr != NULL) {
66 printf("%s:", pr->name);
67
68 for (j = 0; j < pr->count; j++) {
69 (*(pr->probes)[j])();
70 }
71
72 printf("\n");
73 }
74 }
75
76 /*
77 * The following is a simple check to see if cpuid is supported.
78 * We try to toggle bit 21 (PSL_ID) in eflags. If it works, then
79 * cpuid is supported. If not, there's no cpuid, and we don't
80 * try it (don't want /boot to get an invalid opcode exception).
81 */
82 __asm volatile(
83 "pushfl\n\t"
84 "popl %2\n\t"
85 "xorl %2, %0\n\t"
86 "pushl %0\n\t"
87 "popfl\n\t"
88 "pushfl\n\t"
89 "popl %0\n\t"
90 "xorl %2, %0\n\t" /* If %2 == %0, no cpuid */
91 : "=r" (psl_check)
92 : "0" (PSL_ID), "r" (0)
93 : "cc");
94
95 if (psl_check != PSL_ID)
96 return;
97
98 CPUID(0x1, dummy, dummy, ecx, dummy);
99 if (ecx & CPUIDECX_HV) {
100 CPUID(0x40000000, dummy, ebx, ecx, edx);
101 if (memcmp(&ebx, &vmm_hv_signature[0], sizeof(uint32_t)) == 0 &&
102 memcmp(&ecx, &vmm_hv_signature[4], sizeof(uint32_t)) == 0 &&
103 memcmp(&edx, &vmm_hv_signature[8], sizeof(uint32_t)) == 0)
104 vmm = 1;
105 }
106
107 /* Set console to com0/115200 by default in vmm */
108 if (vmm) {
109 dev = ttydev("com0");
110 cnspeed(dev, 115200);
111 cnset(dev);
112 }
113 }
114
115 int
check_skip_conf(void)116 check_skip_conf(void)
117 {
118 /* Return non-zero (skip boot.conf) if Control "shift" key down */
119 #ifndef EFIBOOT
120 return (pc_getshifts(0) & 0x04);
121 #else
122 return (efi_cons_getshifts(0) & 0x04);
123 #endif
124 }
125