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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 | |||
| 29 | #include <arch/cpu.h> |
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| 30 | #include <arch/cpuid.h> |
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| 31 | #include <arch/pm.h> |
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| 32 | |||
| 33 | #include <arch.h> |
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| 34 | #include <arch/types.h> |
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| 35 | #include <print.h> |
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| 36 | #include <typedefs.h> |
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| 391 | jermar | 37 | #include <fpu_context.h> |
| 251 | palkovsky | 38 | |
| 39 | /* |
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| 40 | * Identification of CPUs. |
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| 41 | * Contains only non-MP-Specification specific SMP code. |
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| 42 | */ |
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| 43 | #define AMD_CPUID_EBX 0x68747541 |
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| 44 | #define AMD_CPUID_ECX 0x444d4163 |
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| 45 | #define AMD_CPUID_EDX 0x69746e65 |
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| 46 | |||
| 47 | #define INTEL_CPUID_EBX 0x756e6547 |
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| 48 | #define INTEL_CPUID_ECX 0x6c65746e |
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| 49 | #define INTEL_CPUID_EDX 0x49656e69 |
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| 50 | |||
| 51 | |||
| 52 | enum vendor { |
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| 53 | VendorUnknown=0, |
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| 54 | VendorAMD, |
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| 55 | VendorIntel |
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| 56 | }; |
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| 57 | |||
| 58 | static char *vendor_str[] = { |
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| 59 | "Unknown Vendor", |
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| 60 | "AuthenticAMD", |
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| 61 | "GenuineIntel" |
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| 62 | }; |
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| 63 | |||
| 282 | palkovsky | 64 | |
| 65 | /** Setup flags on processor so that we can use the FPU |
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| 66 | * |
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| 67 | * cr0.osfxsr = 1 -> we do support fxstor/fxrestor |
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| 68 | * cr0.em = 0 -> we do not emulate coprocessor |
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| 69 | * cr0.mp = 1 -> we do want lazy context switch |
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| 70 | */ |
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| 71 | void cpu_setup_fpu(void) |
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| 72 | { |
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| 73 | __asm__ volatile ( |
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| 74 | "movq %%cr0, %%rax;" |
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| 75 | "btsq $1, %%rax;" /* cr0.mp */ |
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| 76 | "btrq $2, %%rax;" /* cr0.em */ |
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| 77 | "movq %%rax, %%cr0;" |
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| 78 | |||
| 79 | "movq %%cr4, %%rax;" |
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| 80 | "bts $9, %%rax;" /* cr4.osfxsr */ |
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| 81 | "movq %%rax, %%cr4;" |
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| 82 | : |
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| 83 | : |
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| 84 | :"%rax" |
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| 85 | ); |
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| 86 | } |
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| 87 | |||
| 88 | /** Set the TS flag to 1. |
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| 89 | * |
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| 90 | * If a thread accesses coprocessor, exception is run, which |
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| 91 | * does a lazy fpu context switch. |
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| 92 | * |
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| 93 | */ |
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| 309 | palkovsky | 94 | void fpu_disable(void) |
| 251 | palkovsky | 95 | { |
| 257 | palkovsky | 96 | __asm__ volatile ( |
| 251 | palkovsky | 97 | "mov %%cr0,%%rax;" |
| 282 | palkovsky | 98 | "bts $3,%%rax;" |
| 251 | palkovsky | 99 | "mov %%rax,%%cr0;" |
| 100 | : |
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| 101 | : |
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| 102 | :"%rax" |
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| 257 | palkovsky | 103 | ); |
| 251 | palkovsky | 104 | } |
| 105 | |||
| 309 | palkovsky | 106 | void fpu_enable(void) |
| 251 | palkovsky | 107 | { |
| 257 | palkovsky | 108 | __asm__ volatile ( |
| 251 | palkovsky | 109 | "mov %%cr0,%%rax;" |
| 282 | palkovsky | 110 | "btr $3,%%rax;" |
| 251 | palkovsky | 111 | "mov %%rax,%%cr0;" |
| 112 | : |
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| 113 | : |
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| 114 | :"%rax" |
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| 257 | palkovsky | 115 | ); |
| 251 | palkovsky | 116 | } |
| 257 | palkovsky | 117 | |
| 118 | void cpu_arch_init(void) |
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| 119 | { |
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| 120 | CPU->arch.tss = tss_p; |
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| 121 | CPU->fpu_owner=NULL; |
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| 122 | } |
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| 123 | |||
| 124 | |||
| 125 | void cpu_identify(void) |
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| 126 | { |
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| 127 | cpu_info_t info; |
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| 128 | |||
| 129 | CPU->arch.vendor = VendorUnknown; |
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| 130 | if (has_cpuid()) { |
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| 131 | cpuid(0, &info); |
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| 132 | |||
| 133 | /* |
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| 134 | * Check for AMD processor. |
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| 135 | */ |
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| 136 | if (info.cpuid_ebx==AMD_CPUID_EBX && info.cpuid_ecx==AMD_CPUID_ECX && info.cpuid_edx==AMD_CPUID_EDX) { |
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| 137 | CPU->arch.vendor = VendorAMD; |
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| 138 | } |
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| 139 | |||
| 140 | /* |
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| 141 | * Check for Intel processor. |
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| 142 | */ |
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| 143 | if (info.cpuid_ebx==INTEL_CPUID_EBX && info.cpuid_ecx==INTEL_CPUID_ECX && info.cpuid_edx==INTEL_CPUID_EDX) { |
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| 144 | CPU->arch.vendor = VendorIntel; |
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| 145 | } |
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| 146 | |||
| 147 | cpuid(1, &info); |
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| 148 | CPU->arch.family = (info.cpuid_eax>>8)&0xf; |
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| 149 | CPU->arch.model = (info.cpuid_eax>>4)&0xf; |
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| 150 | CPU->arch.stepping = (info.cpuid_eax>>0)&0xf; |
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| 151 | } |
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| 152 | } |
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| 153 | |||
| 154 | void cpu_print_report(cpu_t* m) |
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| 155 | { |
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| 156 | printf("cpu%d: (%s family=%d model=%d stepping=%d) %dMHz\n", |
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| 157 | m->id, vendor_str[m->arch.vendor], m->arch.family, m->arch.model, m->arch.stepping, |
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| 158 | m->frequency_mhz); |
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| 159 | } |