Subversion Repositories HelenOS

Rev

Rev 3022 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
251 palkovsky 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
251 palkovsky 3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
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 BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
1731 jermar 29
/** @addtogroup amd64
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
2089 decky 35
#include <cpu.h>
251 palkovsky 36
#include <arch/cpu.h>
37
#include <arch/cpuid.h>
38
#include <arch/pm.h>
39
 
40
#include <arch.h>
41
#include <arch/types.h>
42
#include <print.h>
391 jermar 43
#include <fpu_context.h>
251 palkovsky 44
 
45
/*
46
 * Identification of CPUs.
47
 * Contains only non-MP-Specification specific SMP code.
48
 */
49
#define AMD_CPUID_EBX   0x68747541
50
#define AMD_CPUID_ECX   0x444d4163
51
#define AMD_CPUID_EDX   0x69746e65
52
 
53
#define INTEL_CPUID_EBX 0x756e6547
54
#define INTEL_CPUID_ECX 0x6c65746e
55
#define INTEL_CPUID_EDX 0x49656e69
56
 
57
 
58
enum vendor {
2089 decky 59
    VendorUnknown = 0,
251 palkovsky 60
    VendorAMD,
61
    VendorIntel
62
};
63
 
64
static char *vendor_str[] = {
65
    "Unknown Vendor",
66
    "AuthenticAMD",
67
    "GenuineIntel"
68
};
69
 
282 palkovsky 70
 
71
/** Setup flags on processor so that we can use the FPU
72
 *
73
 * cr0.osfxsr = 1 -> we do support fxstor/fxrestor
74
 * cr0.em = 0 -> we do not emulate coprocessor
75
 * cr0.mp = 1 -> we do want lazy context switch
76
 */
77
void cpu_setup_fpu(void)
78
{
2082 decky 79
    asm volatile (
4055 trochtova 80
        "movq %%cr0, %%rax\n"
81
        "btsq $1, %%rax\n"  /* cr0.mp */
82
        "btrq $2, %%rax\n"  /* cr0.em */
83
        "movq %%rax, %%cr0\n"
84
 
85
        "movq %%cr4, %%rax\n"
86
        "bts $9, %%rax\n"   /* cr4.osfxsr */
87
        "movq %%rax, %%cr4\n"
88
        ::: "%rax"
89
    );
282 palkovsky 90
}
91
 
4055 trochtova 92
/** Set the TS flag to 1.
282 palkovsky 93
 *
94
 * If a thread accesses coprocessor, exception is run, which
95
 * does a lazy fpu context switch.
96
 *
97
 */
309 palkovsky 98
void fpu_disable(void)
251 palkovsky 99
{
4055 trochtova 100
    asm volatile (
101
        "mov %%cr0, %%rax\n"
102
        "bts $3, %%rax\n"
103
        "mov %%rax, %%cr0\n"
104
        ::: "%rax"
105
    );
251 palkovsky 106
}
107
 
309 palkovsky 108
void fpu_enable(void)
251 palkovsky 109
{
4055 trochtova 110
    asm volatile (
111
        "mov %%cr0, %%rax\n"
112
        "btr $3, %%rax\n"
113
        "mov %%rax, %%cr0\n"
114
        ::: "%rax"
115
    );
251 palkovsky 116
}
257 palkovsky 117
 
118
void cpu_arch_init(void)
119
{
120
    CPU->arch.tss = tss_p;
2783 jermar 121
    CPU->arch.tss->iomap_base = &CPU->arch.tss->iomap[0] -
122
        ((uint8_t *) CPU->arch.tss);
1187 jermar 123
    CPU->fpu_owner = NULL;
257 palkovsky 124
}
125
 
126
void cpu_identify(void)
127
{
128
    cpu_info_t info;
129
 
130
    CPU->arch.vendor = VendorUnknown;
131
    if (has_cpuid()) {
132
        cpuid(0, &info);
133
 
134
        /*
135
         * Check for AMD processor.
136
         */
2783 jermar 137
        if (info.cpuid_ebx == AMD_CPUID_EBX &&
138
            info.cpuid_ecx == AMD_CPUID_ECX &&
139
            info.cpuid_edx == AMD_CPUID_EDX) {
257 palkovsky 140
            CPU->arch.vendor = VendorAMD;
141
        }
142
 
143
        /*
144
         * Check for Intel processor.
145
         */    
2783 jermar 146
        if (info.cpuid_ebx == INTEL_CPUID_EBX &&
147
            info.cpuid_ecx == INTEL_CPUID_ECX &&
148
            info.cpuid_edx == INTEL_CPUID_EDX) {
257 palkovsky 149
            CPU->arch.vendor = VendorIntel;
150
        }
151
 
152
        cpuid(1, &info);
2783 jermar 153
        CPU->arch.family = (info.cpuid_eax >> 8) & 0xf;
154
        CPU->arch.model = (info.cpuid_eax >> 4) & 0xf;
155
        CPU->arch.stepping = (info.cpuid_eax >> 0) & 0xf;                      
257 palkovsky 156
    }
157
}
158
 
159
void cpu_print_report(cpu_t* m)
160
{
161
    printf("cpu%d: (%s family=%d model=%d stepping=%d) %dMHz\n",
2783 jermar 162
        m->id, vendor_str[m->arch.vendor], m->arch.family, m->arch.model,
163
        m->arch.stepping, m->frequency_mhz);
257 palkovsky 164
}
1702 cejka 165
 
1731 jermar 166
/** @}
1702 cejka 167
 */