Subversion Repositories HelenOS

Rev

Rev 2787 | 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 (
4377 svoboda 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 
 
4377 svoboda 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 
{
4377 svoboda 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 
{
4377 svoboda 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 
 */