Subversion Repositories HelenOS

Rev

Rev 2071 | Rev 2089 | Go to most recent revision | 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
 
251 palkovsky 35
#include <arch/cpu.h>
36
#include <arch/cpuid.h>
37
#include <arch/pm.h>
38
 
39
#include <arch.h>
40
#include <arch/types.h>
41
#include <print.h>
42
#include <typedefs.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 {
59
    VendorUnknown=0,
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 (
282 palkovsky 80
        "movq %%cr0, %%rax;"
81
        "btsq $1, %%rax;" /* cr0.mp */
82
        "btrq $2, %%rax;"  /* cr0.em */
83
        "movq %%rax, %%cr0;"
84
 
85
        "movq %%cr4, %%rax;"
86
        "bts $9, %%rax;" /* cr4.osfxsr */
87
        "movq %%rax, %%cr4;"
88
        :
89
        :
90
        :"%rax"
91
        );
92
}
93
 
94
/** Set the TS flag to 1.
95
 *
96
 * If a thread accesses coprocessor, exception is run, which
97
 * does a lazy fpu context switch.
98
 *
99
 */
309 palkovsky 100
void fpu_disable(void)
251 palkovsky 101
{
2082 decky 102
    asm volatile (
251 palkovsky 103
        "mov %%cr0,%%rax;"
282 palkovsky 104
        "bts $3,%%rax;"
251 palkovsky 105
        "mov %%rax,%%cr0;"
106
        :
107
        :
108
        :"%rax"
257 palkovsky 109
        );
251 palkovsky 110
}
111
 
309 palkovsky 112
void fpu_enable(void)
251 palkovsky 113
{
2082 decky 114
    asm volatile (
251 palkovsky 115
        "mov %%cr0,%%rax;"
282 palkovsky 116
        "btr $3,%%rax;"
251 palkovsky 117
        "mov %%rax,%%cr0;"
118
        :
119
        :
120
        :"%rax"
257 palkovsky 121
        ); 
251 palkovsky 122
}
257 palkovsky 123
 
124
void cpu_arch_init(void)
125
{
126
    CPU->arch.tss = tss_p;
1780 jermar 127
    CPU->arch.tss->iomap_base = &CPU->arch.tss->iomap[0] - ((uint8_t *) CPU->arch.tss);
1187 jermar 128
    CPU->fpu_owner = NULL;
257 palkovsky 129
}
130
 
131
void cpu_identify(void)
132
{
133
    cpu_info_t info;
134
 
135
    CPU->arch.vendor = VendorUnknown;
136
    if (has_cpuid()) {
137
        cpuid(0, &info);
138
 
139
        /*
140
         * Check for AMD processor.
141
         */
142
        if (info.cpuid_ebx==AMD_CPUID_EBX && info.cpuid_ecx==AMD_CPUID_ECX && info.cpuid_edx==AMD_CPUID_EDX) {
143
            CPU->arch.vendor = VendorAMD;
144
        }
145
 
146
        /*
147
         * Check for Intel processor.
148
         */    
149
        if (info.cpuid_ebx==INTEL_CPUID_EBX && info.cpuid_ecx==INTEL_CPUID_ECX && info.cpuid_edx==INTEL_CPUID_EDX) {
150
            CPU->arch.vendor = VendorIntel;
151
        }
152
 
153
        cpuid(1, &info);
154
        CPU->arch.family = (info.cpuid_eax>>8)&0xf;
155
        CPU->arch.model = (info.cpuid_eax>>4)&0xf;
156
        CPU->arch.stepping = (info.cpuid_eax>>0)&0xf;                      
157
    }
158
}
159
 
160
void cpu_print_report(cpu_t* m)
161
{
162
    printf("cpu%d: (%s family=%d model=%d stepping=%d) %dMHz\n",
163
        m->id, vendor_str[m->arch.vendor], m->arch.family, m->arch.model, m->arch.stepping,
164
        m->frequency_mhz);
165
}
1702 cejka 166
 
1731 jermar 167
/** @}
1702 cejka 168
 */