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| Rev | Author | Line No. | Line |
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| 251 | palkovsky | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 1731 | jermar | 29 | /** @addtogroup amd64 |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 251 | palkovsky | 35 | #include <arch/cpu.h> |
| 36 | #include <arch/cpuid.h> |
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| 37 | #include <arch/pm.h> |
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| 38 | |||
| 39 | #include <arch.h> |
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| 40 | #include <arch/types.h> |
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| 41 | #include <print.h> |
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| 42 | #include <typedefs.h> |
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| 391 | jermar | 43 | #include <fpu_context.h> |
| 251 | palkovsky | 44 | |
| 45 | /* |
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| 46 | * Identification of CPUs. |
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| 47 | * Contains only non-MP-Specification specific SMP code. |
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| 48 | */ |
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| 49 | #define AMD_CPUID_EBX 0x68747541 |
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| 50 | #define AMD_CPUID_ECX 0x444d4163 |
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| 51 | #define AMD_CPUID_EDX 0x69746e65 |
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| 52 | |||
| 53 | #define INTEL_CPUID_EBX 0x756e6547 |
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| 54 | #define INTEL_CPUID_ECX 0x6c65746e |
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| 55 | #define INTEL_CPUID_EDX 0x49656e69 |
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| 56 | |||
| 57 | |||
| 58 | enum vendor { |
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| 59 | VendorUnknown=0, |
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| 60 | VendorAMD, |
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| 61 | VendorIntel |
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| 62 | }; |
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| 63 | |||
| 64 | static char *vendor_str[] = { |
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| 65 | "Unknown Vendor", |
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| 66 | "AuthenticAMD", |
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| 67 | "GenuineIntel" |
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| 68 | }; |
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| 69 | |||
| 282 | palkovsky | 70 | |
| 71 | /** Setup flags on processor so that we can use the FPU |
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| 72 | * |
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| 73 | * cr0.osfxsr = 1 -> we do support fxstor/fxrestor |
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| 74 | * cr0.em = 0 -> we do not emulate coprocessor |
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| 75 | * cr0.mp = 1 -> we do want lazy context switch |
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| 76 | */ |
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| 77 | void cpu_setup_fpu(void) |
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| 78 | { |
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| 79 | __asm__ volatile ( |
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| 80 | "movq %%cr0, %%rax;" |
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| 81 | "btsq $1, %%rax;" /* cr0.mp */ |
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| 82 | "btrq $2, %%rax;" /* cr0.em */ |
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| 83 | "movq %%rax, %%cr0;" |
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| 84 | |||
| 85 | "movq %%cr4, %%rax;" |
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| 86 | "bts $9, %%rax;" /* cr4.osfxsr */ |
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| 87 | "movq %%rax, %%cr4;" |
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| 88 | : |
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| 89 | : |
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| 90 | :"%rax" |
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| 91 | ); |
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| 92 | } |
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| 93 | |||
| 94 | /** Set the TS flag to 1. |
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| 95 | * |
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| 96 | * If a thread accesses coprocessor, exception is run, which |
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| 97 | * does a lazy fpu context switch. |
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| 98 | * |
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| 99 | */ |
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| 309 | palkovsky | 100 | void fpu_disable(void) |
| 251 | palkovsky | 101 | { |
| 257 | palkovsky | 102 | __asm__ volatile ( |
| 251 | palkovsky | 103 | "mov %%cr0,%%rax;" |
| 282 | palkovsky | 104 | "bts $3,%%rax;" |
| 251 | palkovsky | 105 | "mov %%rax,%%cr0;" |
| 106 | : |
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| 107 | : |
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| 108 | :"%rax" |
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| 257 | palkovsky | 109 | ); |
| 251 | palkovsky | 110 | } |
| 111 | |||
| 309 | palkovsky | 112 | void fpu_enable(void) |
| 251 | palkovsky | 113 | { |
| 257 | palkovsky | 114 | __asm__ volatile ( |
| 251 | palkovsky | 115 | "mov %%cr0,%%rax;" |
| 282 | palkovsky | 116 | "btr $3,%%rax;" |
| 251 | palkovsky | 117 | "mov %%rax,%%cr0;" |
| 118 | : |
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| 119 | : |
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| 120 | :"%rax" |
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| 257 | palkovsky | 121 | ); |
| 251 | palkovsky | 122 | } |
| 257 | palkovsky | 123 | |
| 124 | void cpu_arch_init(void) |
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| 125 | { |
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| 126 | CPU->arch.tss = tss_p; |
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| 1187 | jermar | 127 | CPU->arch.tss->iomap_base = &CPU->arch.tss->iomap[0] - ((__u8 *) CPU->arch.tss); |
| 128 | CPU->fpu_owner = NULL; |
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| 257 | palkovsky | 129 | } |
| 130 | |||
| 131 | void cpu_identify(void) |
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| 132 | { |
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| 133 | cpu_info_t info; |
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| 134 | |||
| 135 | CPU->arch.vendor = VendorUnknown; |
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| 136 | if (has_cpuid()) { |
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| 137 | cpuid(0, &info); |
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| 138 | |||
| 139 | /* |
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| 140 | * Check for AMD processor. |
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| 141 | */ |
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| 142 | if (info.cpuid_ebx==AMD_CPUID_EBX && info.cpuid_ecx==AMD_CPUID_ECX && info.cpuid_edx==AMD_CPUID_EDX) { |
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| 143 | CPU->arch.vendor = VendorAMD; |
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| 144 | } |
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| 145 | |||
| 146 | /* |
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| 147 | * Check for Intel processor. |
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| 148 | */ |
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| 149 | if (info.cpuid_ebx==INTEL_CPUID_EBX && info.cpuid_ecx==INTEL_CPUID_ECX && info.cpuid_edx==INTEL_CPUID_EDX) { |
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| 150 | CPU->arch.vendor = VendorIntel; |
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| 151 | } |
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| 152 | |||
| 153 | cpuid(1, &info); |
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| 154 | CPU->arch.family = (info.cpuid_eax>>8)&0xf; |
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| 155 | CPU->arch.model = (info.cpuid_eax>>4)&0xf; |
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| 156 | CPU->arch.stepping = (info.cpuid_eax>>0)&0xf; |
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| 157 | } |
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| 158 | } |
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| 159 | |||
| 160 | void cpu_print_report(cpu_t* m) |
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| 161 | { |
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| 162 | printf("cpu%d: (%s family=%d model=%d stepping=%d) %dMHz\n", |
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| 163 | m->id, vendor_str[m->arch.vendor], m->arch.family, m->arch.model, m->arch.stepping, |
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| 164 | m->frequency_mhz); |
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| 165 | } |
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| 1702 | cejka | 166 | |
| 1731 | jermar | 167 | /** @} |
| 1702 | cejka | 168 | */ |