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| Rev | Author | Line No. | Line |
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| 251 | palkovsky | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2001-2004 Jakub Jermar |
| 251 | palkovsky | 3 | * All rights reserved. |
| 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 | |||
| 2089 | decky | 35 | #include <cpu.h> |
| 251 | palkovsky | 36 | #include <arch/cpu.h> |
| 37 | #include <arch/cpuid.h> |
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| 38 | #include <arch/pm.h> |
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| 39 | |||
| 40 | #include <arch.h> |
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| 41 | #include <arch/types.h> |
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| 42 | #include <print.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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| 2089 | decky | 59 | VendorUnknown = 0, |
| 251 | palkovsky | 60 | VendorAMD, |
| 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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| 2082 | decky | 79 | asm volatile ( |
| 4345 | svoboda | 80 | "movq %%cr0, %%rax\n" |
| 81 | "btsq $1, %%rax\n" /* cr0.mp */ |
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| 82 | "btrq $2, %%rax\n" /* cr0.em */ |
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| 83 | "movq %%rax, %%cr0\n" |
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| 84 | |||
| 85 | "movq %%cr4, %%rax\n" |
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| 86 | "bts $9, %%rax\n" /* cr4.osfxsr */ |
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| 87 | "movq %%rax, %%cr4\n" |
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| 88 | ::: "%rax" |
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| 89 | ); |
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| 282 | palkovsky | 90 | } |
| 91 | |||
| 4345 | svoboda | 92 | /** Set the TS flag to 1. |
| 282 | palkovsky | 93 | * |
| 94 | * If a thread accesses coprocessor, exception is run, which |
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| 95 | * does a lazy fpu context switch. |
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| 96 | * |
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| 97 | */ |
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| 309 | palkovsky | 98 | void fpu_disable(void) |
| 251 | palkovsky | 99 | { |
| 4345 | svoboda | 100 | asm volatile ( |
| 101 | "mov %%cr0, %%rax\n" |
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| 102 | "bts $3, %%rax\n" |
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| 103 | "mov %%rax, %%cr0\n" |
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| 104 | ::: "%rax" |
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| 105 | ); |
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| 251 | palkovsky | 106 | } |
| 107 | |||
| 309 | palkovsky | 108 | void fpu_enable(void) |
| 251 | palkovsky | 109 | { |
| 4345 | svoboda | 110 | asm volatile ( |
| 111 | "mov %%cr0, %%rax\n" |
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| 112 | "btr $3, %%rax\n" |
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| 113 | "mov %%rax, %%cr0\n" |
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| 114 | ::: "%rax" |
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| 115 | ); |
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| 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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| 2783 | jermar | 121 | CPU->arch.tss->iomap_base = &CPU->arch.tss->iomap[0] - |
| 122 | ((uint8_t *) CPU->arch.tss); |
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| 1187 | jermar | 123 | CPU->fpu_owner = NULL; |
| 257 | palkovsky | 124 | } |
| 125 | |||
| 126 | void cpu_identify(void) |
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| 127 | { |
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| 128 | cpu_info_t info; |
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| 129 | |||
| 130 | CPU->arch.vendor = VendorUnknown; |
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| 131 | if (has_cpuid()) { |
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| 132 | cpuid(0, &info); |
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| 133 | |||
| 134 | /* |
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| 135 | * Check for AMD processor. |
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| 136 | */ |
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| 2783 | jermar | 137 | if (info.cpuid_ebx == AMD_CPUID_EBX && |
| 138 | info.cpuid_ecx == AMD_CPUID_ECX && |
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| 139 | info.cpuid_edx == AMD_CPUID_EDX) { |
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| 257 | palkovsky | 140 | CPU->arch.vendor = VendorAMD; |
| 141 | } |
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| 142 | |||
| 143 | /* |
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| 144 | * Check for Intel processor. |
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| 145 | */ |
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| 2783 | jermar | 146 | if (info.cpuid_ebx == INTEL_CPUID_EBX && |
| 147 | info.cpuid_ecx == INTEL_CPUID_ECX && |
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| 148 | info.cpuid_edx == INTEL_CPUID_EDX) { |
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| 257 | palkovsky | 149 | CPU->arch.vendor = VendorIntel; |
| 150 | } |
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| 151 | |||
| 152 | cpuid(1, &info); |
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| 2783 | jermar | 153 | CPU->arch.family = (info.cpuid_eax >> 8) & 0xf; |
| 154 | CPU->arch.model = (info.cpuid_eax >> 4) & 0xf; |
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| 155 | CPU->arch.stepping = (info.cpuid_eax >> 0) & 0xf; |
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| 257 | palkovsky | 156 | } |
| 157 | } |
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| 158 | |||
| 159 | void cpu_print_report(cpu_t* m) |
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| 160 | { |
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| 161 | printf("cpu%d: (%s family=%d model=%d stepping=%d) %dMHz\n", |
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| 2783 | jermar | 162 | m->id, vendor_str[m->arch.vendor], m->arch.family, m->arch.model, |
| 163 | m->arch.stepping, m->frequency_mhz); |
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| 257 | palkovsky | 164 | } |
| 1702 | cejka | 165 | |
| 1731 | jermar | 166 | /** @} |
| 1702 | cejka | 167 | */ |