2
* Copyright (c) 2001-2004 Jakub Jermar
5
* Redistribution and use in source and binary forms, with or without
6
* modification, are permitted provided that the following conditions
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.
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.
37
#include <arch/cpuid.h>
41
#include <arch/types.h>
43
#include <fpu_context.h>
46
* Identification of CPUs.
47
* Contains only non-MP-Specification specific SMP code.
49
#define AMD_CPUID_EBX 0x68747541
50
#define AMD_CPUID_ECX 0x444d4163
51
#define AMD_CPUID_EDX 0x69746e65
53
#define INTEL_CPUID_EBX 0x756e6547
54
#define INTEL_CPUID_ECX 0x6c65746e
55
#define INTEL_CPUID_EDX 0x49656e69
64
static char *vendor_str[] = {
71
/** Setup flags on processor so that we can use the FPU
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
77
void cpu_setup_fpu(void)
81
"btsq $1, %%rax\n" /* cr0.mp */
82
"btrq $2, %%rax\n" /* cr0.em */
86
"bts $9, %%rax\n" /* cr4.osfxsr */
92
/** Set the TS flag to 1.
94
* If a thread accesses coprocessor, exception is run, which
95
* does a lazy fpu context switch.
98
void fpu_disable(void)
108
void fpu_enable(void)
118
void cpu_arch_init(void)
120
CPU->arch.tss = tss_p;
121
CPU->arch.tss->iomap_base = &CPU->arch.tss->iomap[0] -
122
((uint8_t *) CPU->arch.tss);
123
CPU->fpu_owner = NULL;
126
void cpu_identify(void)
130
CPU->arch.vendor = VendorUnknown;
135
* Check for AMD processor.
137
if (info.cpuid_ebx == AMD_CPUID_EBX &&
138
info.cpuid_ecx == AMD_CPUID_ECX &&
139
info.cpuid_edx == AMD_CPUID_EDX) {
140
CPU->arch.vendor = VendorAMD;
144
* Check for Intel processor.
146
if (info.cpuid_ebx == INTEL_CPUID_EBX &&
147
info.cpuid_ecx == INTEL_CPUID_ECX &&
148
info.cpuid_edx == INTEL_CPUID_EDX) {
149
CPU->arch.vendor = VendorIntel;
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;
159
void cpu_print_report(cpu_t* m)
161
printf("cpu%d: (%s family=%d model=%d stepping=%d) %dMHz\n",
162
m->id, vendor_str[m->arch.vendor], m->arch.family, m->arch.model,
163
m->arch.stepping, m->frequency_mhz);