| 1 | /*␊ |
| 2 | * Copyright 2008 Islam Ahmed Zaid. All rights reserved. <azismed@gmail.com>␊ |
| 3 | * AsereBLN: 2009: cleanup and bugfix␊ |
| 4 | */␊ |
| 5 | ␊ |
| 6 | #ifndef __LIBSAIO_CPU_H␊ |
| 7 | #define __LIBSAIO_CPU_H␊ |
| 8 | ␊ |
| 9 | #include "platform.h"␊ |
| 10 | ␊ |
| 11 | extern void scan_cpu(PlatformInfo_t *);␊ |
| 12 | ␊ |
| 13 | #define bit(n)␉␉␉(1ULL << (n))␊ |
| 14 | #define bitmask(h,l)␉␉((bit(h)|(bit(h)-1)) & ~(bit(l)-1))␊ |
| 15 | #define bitfield(x,h,l)␉␉(((x) & bitmask(h,l)) >> l)␊ |
| 16 | ␊ |
| 17 | #define CPU_STRING_UNKNOWN␉␉"Unknown CPU Type"␊ |
| 18 | ␊ |
| 19 | /*␊ |
| 20 | * The CPUID_FEATURE_XXX values define 64-bit values␊ |
| 21 | * returned in %ecx:%edx to a CPUID request with %eax of 1: ␊ |
| 22 | */␊ |
| 23 | #define CPUID_FEATURE_FPU _Bit(0) /* Floating point unit on-chip */␊ |
| 24 | #define CPUID_FEATURE_VME _Bit(1) /* Virtual Mode Extension */␊ |
| 25 | #define CPUID_FEATURE_DE _Bit(2) /* Debugging Extension */␊ |
| 26 | #define CPUID_FEATURE_PSE _Bit(3) /* Page Size Extension */␊ |
| 27 | #define CPUID_FEATURE_TSC _Bit(4) /* Time Stamp Counter */␊ |
| 28 | #define CPUID_FEATURE_MSR _Bit(5) /* Model Specific Registers */␊ |
| 29 | #define CPUID_FEATURE_PAE _Bit(6) /* Physical Address Extension */␊ |
| 30 | #define CPUID_FEATURE_MCE _Bit(7) /* Machine Check Exception */␊ |
| 31 | #define CPUID_FEATURE_CX8 _Bit(8) /* CMPXCHG8B */␊ |
| 32 | #define CPUID_FEATURE_APIC _Bit(9) /* On-chip APIC */␊ |
| 33 | #define CPUID_FEATURE_SEP _Bit(11) /* Fast System Call */␊ |
| 34 | #define CPUID_FEATURE_MTRR _Bit(12) /* Memory Type Range Register */␊ |
| 35 | #define CPUID_FEATURE_PGE _Bit(13) /* Page Global Enable */␊ |
| 36 | #define CPUID_FEATURE_MCA _Bit(14) /* Machine Check Architecture */␊ |
| 37 | #define CPUID_FEATURE_CMOV _Bit(15) /* Conditional Move Instruction */␊ |
| 38 | #define CPUID_FEATURE_PAT _Bit(16) /* Page Attribute Table */␊ |
| 39 | #define CPUID_FEATURE_PSE36 _Bit(17) /* 36-bit Page Size Extension */␊ |
| 40 | #define CPUID_FEATURE_PSN _Bit(18) /* Processor Serial Number */␊ |
| 41 | #define CPUID_FEATURE_CLFSH _Bit(19) /* CLFLUSH Instruction supported */␊ |
| 42 | #define CPUID_FEATURE_DS _Bit(21) /* Debug Store */␊ |
| 43 | #define CPUID_FEATURE_ACPI _Bit(22) /* Thermal monitor and Clock Ctrl */␊ |
| 44 | #define CPUID_FEATURE_MMX _Bit(23) /* MMX supported */␊ |
| 45 | #define CPUID_FEATURE_FXSR _Bit(24) /* Fast floating pt save/restore */␊ |
| 46 | #define CPUID_FEATURE_SSE _Bit(25) /* Streaming SIMD extensions */␊ |
| 47 | #define CPUID_FEATURE_SSE2 _Bit(26) /* Streaming SIMD extensions 2 */␊ |
| 48 | #define CPUID_FEATURE_SS _Bit(27) /* Self-Snoop */␊ |
| 49 | #define CPUID_FEATURE_HTT _Bit(28) /* Hyper-Threading Technology */␊ |
| 50 | #define CPUID_FEATURE_TM _Bit(29) /* Thermal Monitor (TM1) */␊ |
| 51 | #define CPUID_FEATURE_PBE _Bit(31) /* Pend Break Enable */␊ |
| 52 | ␊ |
| 53 | #define CPUID_FEATURE_SSE3 _HBit(0) /* Streaming SIMD extensions 3 */␊ |
| 54 | #define CPUID_FEATURE_PCLMULQDQ _HBit(1) /* PCLMULQDQ instruction */␊ |
| 55 | #define CPUID_FEATURE_DTES64 _HBit(2) /* 64-bit DS layout */␊ |
| 56 | #define CPUID_FEATURE_MONITOR _HBit(3) /* Monitor/mwait */␊ |
| 57 | #define CPUID_FEATURE_DSCPL _HBit(4) /* Debug Store CPL */␊ |
| 58 | #define CPUID_FEATURE_VMX _HBit(5) /* VMX */␊ |
| 59 | #define CPUID_FEATURE_SMX _HBit(6) /* SMX */␊ |
| 60 | #define CPUID_FEATURE_EST _HBit(7) /* Enhanced SpeedsTep (GV3) */␊ |
| 61 | #define CPUID_FEATURE_TM2 _HBit(8) /* Thermal Monitor 2 */␊ |
| 62 | #define CPUID_FEATURE_SSSE3 _HBit(9) /* Supplemental SSE3 instructions */␊ |
| 63 | #define CPUID_FEATURE_CID _HBit(10) /* L1 Context ID */␊ |
| 64 | #define CPUID_FEATURE_SEGLIM64 _HBit(11) /* 64-bit segment limit checking */␊ |
| 65 | #define CPUID_FEATURE_FMA _HBit(12) /* Fused-Multiply-Add support */␊ |
| 66 | #define CPUID_FEATURE_CX16 _HBit(13) /* CmpXchg16b instruction */␊ |
| 67 | #define CPUID_FEATURE_xTPR _HBit(14) /* Send Task PRiority msgs */␊ |
| 68 | #define CPUID_FEATURE_PDCM _HBit(15) /* Perf/Debug Capability MSR */␊ |
| 69 | ␊ |
| 70 | #define CPUID_FEATURE_PCID _HBit(17) /* ASID-PCID support */␊ |
| 71 | #define CPUID_FEATURE_DCA _HBit(18) /* Direct Cache Access */␊ |
| 72 | #define CPUID_FEATURE_SSE4_1 _HBit(19) /* Streaming SIMD extensions 4.1 */␊ |
| 73 | #define CPUID_FEATURE_SSE4_2 _HBit(20) /* Streaming SIMD extensions 4.2 */␊ |
| 74 | #define CPUID_FEATURE_x2APIC _HBit(21) /* Extended APIC Mode */␊ |
| 75 | #define CPUID_FEATURE_MOVBE _HBit(22) /* MOVBE instruction */␊ |
| 76 | #define CPUID_FEATURE_POPCNT _HBit(23) /* POPCNT instruction */␊ |
| 77 | #define CPUID_FEATURE_TSCTMR _HBit(24) /* TSC deadline timer */␊ |
| 78 | #define CPUID_FEATURE_AES _HBit(25) /* AES instructions */␊ |
| 79 | #define CPUID_FEATURE_XSAVE _HBit(26) /* XSAVE instructions */␊ |
| 80 | #define CPUID_FEATURE_OSXSAVE _HBit(27) /* XGETBV/XSETBV instructions */␊ |
| 81 | #define CPUID_FEATURE_AVX1_0␉_HBit(28) /* AVX 1.0 instructions */␊ |
| 82 | #define CPUID_FEATURE_F16C␉_HBit(29) /* Float16 convert instructions */␊ |
| 83 | #define CPUID_FEATURE_RDRAND␉_HBit(30) /* RDRAND instruction */␊ |
| 84 | #define CPUID_FEATURE_VMM _HBit(31) /* VMM (Hypervisor) present */␊ |
| 85 | ␊ |
| 86 | /*␊ |
| 87 | * Leaf 7, subleaf 0 additional features.␊ |
| 88 | * Bits returned in %ebx to a CPUID request with {%eax,%ecx} of (0x7,0x0}:␊ |
| 89 | */␊ |
| 90 | #define CPUID_LEAF7_FEATURE_RDWRFSGS _Bit(0)␉/* FS/GS base read/write */␊ |
| 91 | #define CPUID_LEAF7_FEATURE_TSCOFF _Bit(1)␉/* TSC thread offset */␊ |
| 92 | #define CPUID_LEAF7_FEATURE_BMI1 _Bit(3)␉/* Bit Manipulation Instrs, set 1 */␊ |
| 93 | #define CPUID_LEAF7_FEATURE_HLE _Bit(4)␉/* Hardware Lock Elision*/␊ |
| 94 | #define CPUID_LEAF7_FEATURE_AVX2 _Bit(5)␉/* AVX2 Instructions */␊ |
| 95 | #define CPUID_LEAF7_FEATURE_SMEP _Bit(7)␉/* Supervisor Mode Execute Protect */␊ |
| 96 | #define CPUID_LEAF7_FEATURE_BMI2 _Bit(8)␉/* Bit Manipulation Instrs, set 2 */␊ |
| 97 | #define CPUID_LEAF7_FEATURE_ENFSTRG _Bit(9)␉/* ENhanced Fast STRinG copy */␊ |
| 98 | #define CPUID_LEAF7_FEATURE_INVPCID _Bit(10)␉/* INVPCID intruction, TDB */␊ |
| 99 | #define CPUID_LEAF7_FEATURE_RTM _Bit(11)␉/* TBD */␊ |
| 100 | ␊ |
| 101 | /*␊ |
| 102 | * The CPUID_EXTFEATURE_XXX values define 64-bit values␊ |
| 103 | * returned in %ecx:%edx to a CPUID request with %eax of 0x80000001: ␊ |
| 104 | */␊ |
| 105 | #define CPUID_EXTFEATURE_SYSCALL _Bit(11)␉/* SYSCALL/sysret */␊ |
| 106 | #define CPUID_EXTFEATURE_XD␉ _Bit(20)␉/* eXecute Disable */␊ |
| 107 | ␊ |
| 108 | #define CPUID_EXTFEATURE_1GBPAGE _Bit(26)␉/* 1GB pages */␊ |
| 109 | #define CPUID_EXTFEATURE_RDTSCP␉ _Bit(27)␉/* RDTSCP */␊ |
| 110 | #define CPUID_EXTFEATURE_EM64T␉ _Bit(29)␉/* Extended Mem 64 Technology */␊ |
| 111 | ␊ |
| 112 | #define CPUID_EXTFEATURE_LAHF␉ _HBit(0)␉/* LAFH/SAHF instructions */␊ |
| 113 | ␊ |
| 114 | /*␊ |
| 115 | * The CPUID_EXTFEATURE_XXX values define 64-bit values␊ |
| 116 | * returned in %ecx:%edx to a CPUID request with %eax of 0x80000007: ␊ |
| 117 | */␊ |
| 118 | #define CPUID_EXTFEATURE_TSCI _Bit(8)␉/* TSC Invariant */␊ |
| 119 | ␊ |
| 120 | #define␉CPUID_CACHE_SIZE␉16␉/* Number of descriptor values */␊ |
| 121 | ␊ |
| 122 | #define CPUID_MWAIT_EXTENSION␉_Bit(0)␉/* enumeration of WMAIT extensions */␊ |
| 123 | #define CPUID_MWAIT_BREAK␉_Bit(1)␉/* interrupts are break events␉ */␊ |
| 124 | ␊ |
| 125 | //-- processor type -> p_type:␊ |
| 126 | #define PT_OEM␉0x00␉// Intel Original OEM Processor;␊ |
| 127 | #define PT_OD␉0x01 ␉// Intel Over Drive Processor;␊ |
| 128 | #define PT_DUAL␉0x02␉// Intel Dual Processor;␊ |
| 129 | #define PT_RES␉0x03␉// Intel Reserved;␊ |
| 130 | ␊ |
| 131 | /* Known MSR registers */␊ |
| 132 | #define MSR_IA32_PLATFORM_ID 0x0017␊ |
| 133 | #define MSR_CORE_THREAD_COUNT 0x0035␉/* limited use - not for Penryn or older */␊ |
| 134 | #define IA32_TSC_ADJUST 0x003B␊ |
| 135 | #define MSR_IA32_BIOS_SIGN_ID 0x008B␉/* microcode version */␊ |
| 136 | #define MSR_FSB_FREQ 0x00CD␉/* limited use - not for i7 */␊ |
| 137 | #define␉MSR_PLATFORM_INFO 0x00CE␉/* limited use - MinRatio for i7 but Max for Yonah␉*/␊ |
| 138 | /* turbo for penryn */␊ |
| 139 | #define MSR_PKG_CST_CONFIG_CONTROL 0x00E2␉/* sandy and ivy */␊ |
| 140 | #define MSR_PMG_IO_CAPTURE_BASE 0x00E4␊ |
| 141 | #define IA32_MPERF 0x00E7␉/* TSC in C0 only */␊ |
| 142 | #define IA32_APERF 0x00E8␉/* actual clocks in C0 */␊ |
| 143 | #define MSR_IA32_EXT_CONFIG 0x00EE␉/* limited use - not for i7 */␊ |
| 144 | #define MSR_FLEX_RATIO 0x0194␉/* limited use - not for Penryn or older */␊ |
| 145 | ␉␉␉␉␉␉//see no value on most CPUs␊ |
| 146 | #define␉MSR_IA32_PERF_STATUS 0x0198␊ |
| 147 | #define MSR_IA32_PERF_CONTROL 0x0199␊ |
| 148 | #define MSR_IA32_CLOCK_MODULATION 0x019A␊ |
| 149 | #define MSR_THERMAL_STATUS 0x019C␊ |
| 150 | #define MSR_IA32_MISC_ENABLE 0x01A0␊ |
| 151 | #define MSR_THERMAL_TARGET 0x01A2␉ /* TjMax limited use - not for Penryn or older␉*/␊ |
| 152 | #define MSR_MISC_PWR_MGMT 0x01AA␊ |
| 153 | #define MSR_TURBO_RATIO_LIMIT 0x01AD␉ /* limited use - not for Penryn or older */␊ |
| 154 | ␊ |
| 155 | #define IA32_ENERGY_PERF_BIAS␉␉0x01B0␊ |
| 156 | #define MSR_PACKAGE_THERM_STATUS␉0x01B1␊ |
| 157 | #define IA32_PLATFORM_DCA_CAP␉␉0x01F8␊ |
| 158 | #define MSR_POWER_CTL␉␉␉0x01FC // MSR 000001FC 0000-0000-0004-005F␊ |
| 159 | ␊ |
| 160 | // Sandy Bridge & JakeTown specific 'Running Average Power Limit' MSR's.␊ |
| 161 | #define MSR_RAPL_POWER_UNIT␉␉␉0x606 /* R/O */␊ |
| 162 | //MSR 00000606 0000-0000-000A-1003␊ |
| 163 | #define MSR_PKGC3_IRTL 0x60A /* RW time limit to go C3 */␊ |
| 164 | // bit 15 = 1 -- the value valid for C-state PM␊ |
| 165 | #define MSR_PKGC6_IRTL 0x60B /* RW time limit to go C6 */␊ |
| 166 | //MSR 0000060B 0000-0000-0000-8854␊ |
| 167 | //Valid + 010=1024ns + 0x54=84mks␊ |
| 168 | #define MSR_PKGC7_IRTL 0x60C /* RW time limit to go C7 */␊ |
| 169 | //MSR 0000060C 0000-0000-0000-8854␊ |
| 170 | #define MSR_PKG_C2_RESIDENCY 0x60D /* same as TSC but in C2 only */␊ |
| 171 | ␊ |
| 172 | #define MSR_PKG_RAPL_POWER_LIMIT␉0x610 //MSR 00000610 0000-A580-0000-8960␊ |
| 173 | #define MSR_PKG_ENERGY_STATUS␉␉0x611 //MSR 00000611 0000-0000-3212-A857␊ |
| 174 | #define MSR_PKG_POWER_INFO␉␉␉0x614 //MSR 00000614 0000-0000-01E0-02F8␊ |
| 175 | ␊ |
| 176 | //AMD␊ |
| 177 | #define K8_FIDVID_STATUS 0xC0010042␊ |
| 178 | #define K10_COFVID_LIMIT 0xC0010061␊ |
| 179 | #define K10_PSTATE_STATUS 0xC0010064␊ |
| 180 | #define K10_COFVID_STATUS 0xC0010071␊ |
| 181 | ␊ |
| 182 | #define MSR_AMD_MPERF 0x000000E7␊ |
| 183 | #define MSR_AMD_APERF 0x000000E8␊ |
| 184 | ␊ |
| 185 | #define DEFAULT_FSB␉␉100000 /* for now, hardcoding 100MHz for old CPUs */␊ |
| 186 | ␊ |
| 187 | // DFE: This constant comes from older xnu:␊ |
| 188 | #define CLKNUM␉␉␉1193182␉␉/* formerly 1193167 */␊ |
| 189 | ␊ |
| 190 | // DFE: These two constants come from Linux except CLOCK_TICK_RATE replaced with CLKNUM␊ |
| 191 | #define CALIBRATE_TIME_MSEC␉30␉␉/* 30 msecs */␊ |
| 192 | #define CALIBRATE_LATCH␉␉((CLKNUM * CALIBRATE_TIME_MSEC + 1000/2)/1000)␊ |
| 193 | ␊ |
| 194 | static inline uint64_t rdtsc64(void)␊ |
| 195 | {␊ |
| 196 | ␉uint64_t ret;␊ |
| 197 | ␉__asm__ volatile("rdtsc" : "=A" (ret));␊ |
| 198 | ␉return ret;␊ |
| 199 | }␊ |
| 200 | ␊ |
| 201 | static inline uint64_t rdmsr64(uint32_t msr)␊ |
| 202 | {␊ |
| 203 | uint64_t ret;␊ |
| 204 | __asm__ volatile("rdmsr" : "=A" (ret) : "c" (msr));␊ |
| 205 | return ret;␊ |
| 206 | }␊ |
| 207 | ␊ |
| 208 | static inline void wrmsr64(uint32_t msr, uint64_t val)␊ |
| 209 | {␊ |
| 210 | ␉__asm__ volatile("wrmsr" : : "c" (msr), "A" (val));␊ |
| 211 | }␊ |
| 212 | ␊ |
| 213 | static inline void intel_waitforsts(void) {␊ |
| 214 | ␉uint32_t inline_timeout = 100000;␊ |
| 215 | ␉while (rdmsr64(MSR_IA32_PERF_STATUS) & (1 << 21)) { if (!inline_timeout--) break; }␊ |
| 216 | }␊ |
| 217 | ␊ |
| 218 | static inline void do_cpuid(uint32_t selector, uint32_t *data)␊ |
| 219 | {␊ |
| 220 | ␉asm volatile ("cpuid"␊ |
| 221 | ␉␉␉␉ : "=a" (data[0]),␊ |
| 222 | ␉␉␉␉ "=b" (data[1]),␊ |
| 223 | ␉␉␉␉ "=c" (data[2]),␊ |
| 224 | ␉␉␉␉ "=d" (data[3])␊ |
| 225 | ␉␉␉␉ : "a" (selector));␊ |
| 226 | }␊ |
| 227 | ␊ |
| 228 | static inline void do_cpuid2(uint32_t selector, uint32_t selector2, uint32_t *data)␊ |
| 229 | {␊ |
| 230 | ␉asm volatile ("cpuid"␊ |
| 231 | ␉␉␉␉ : "=a" (data[0]),␊ |
| 232 | ␉␉␉␉ "=b" (data[1]),␊ |
| 233 | ␉␉␉␉ "=c" (data[2]),␊ |
| 234 | ␉␉␉␉ "=d" (data[3])␊ |
| 235 | ␉␉␉␉ : "a" (selector), "c" (selector2));␊ |
| 236 | }␊ |
| 237 | ␊ |
| 238 | // DFE: enable_PIT2 and disable_PIT2 come from older xnu␊ |
| 239 | ␊ |
| 240 | /*␊ |
| 241 | * Enable or disable timer 2.␊ |
| 242 | * Port 0x61 controls timer 2:␊ |
| 243 | * bit 0 gates the clock,␊ |
| 244 | * bit 1 gates output to speaker.␊ |
| 245 | */␊ |
| 246 | static inline void enable_PIT2(void)␊ |
| 247 | {␊ |
| 248 | /* Enable gate, disable speaker */␊ |
| 249 | __asm__ volatile(␊ |
| 250 | ␉␉␉␉␉ " inb $0x61,%%al \n\t"␊ |
| 251 | ␉␉␉␉␉ " and $0xFC,%%al \n\t" /* & ~0x03 */␊ |
| 252 | ␉␉␉␉␉ " or $1,%%al \n\t"␊ |
| 253 | ␉␉␉␉␉ " outb %%al,$0x61 \n\t"␊ |
| 254 | ␉␉␉␉␉ : : : "%al" );␊ |
| 255 | }␊ |
| 256 | ␊ |
| 257 | static inline void disable_PIT2(void)␊ |
| 258 | {␊ |
| 259 | /* Disable gate and output to speaker */␊ |
| 260 | __asm__ volatile(␊ |
| 261 | ␉␉␉␉␉ " inb $0x61,%%al \n\t"␊ |
| 262 | ␉␉␉␉␉ " and $0xFC,%%al \n\t"␉/* & ~0x03 */␊ |
| 263 | ␉␉␉␉␉ " outb %%al,$0x61 \n\t"␊ |
| 264 | ␉␉␉␉␉ : : : "%al" );␊ |
| 265 | }␊ |
| 266 | ␊ |
| 267 | // DFE: set_PIT2_mode0, poll_PIT2_gate, and measure_tsc_frequency are␊ |
| 268 | // roughly based on Linux code␊ |
| 269 | ␊ |
| 270 | /* Set the 8254 channel 2 to mode 0 with the specified value.␊ |
| 271 | In mode 0, the counter will initially set its gate low when the␊ |
| 272 | timer expires. For this to be useful, you ought to set it high␊ |
| 273 | before calling this function. The enable_PIT2 function does this.␊ |
| 274 | */␊ |
| 275 | static inline void set_PIT2_mode0(uint16_t value)␊ |
| 276 | {␊ |
| 277 | __asm__ volatile(␊ |
| 278 | ␉␉␉␉␉ " movb $0xB0,%%al \n\t"␊ |
| 279 | ␉␉␉␉␉ " outb␉%%al,$0x43␉\n\t"␊ |
| 280 | ␉␉␉␉␉ " movb␉%%dl,%%al␉\n\t"␊ |
| 281 | ␉␉␉␉␉ " outb␉%%al,$0x42␉\n\t"␊ |
| 282 | ␉␉␉␉␉ " movb␉%%dh,%%al␉\n\t"␊ |
| 283 | ␉␉␉␉␉ " outb␉%%al,$0x42"␊ |
| 284 | ␉␉␉␉␉ : : "d"(value) /*: no clobber */ );␊ |
| 285 | }␊ |
| 286 | ␊ |
| 287 | /* Returns the number of times the loop ran before the PIT2 signaled */␊ |
| 288 | static inline unsigned long poll_PIT2_gate(void)␊ |
| 289 | {␊ |
| 290 | unsigned long count = 0;␊ |
| 291 | unsigned char nmi_sc_val;␊ |
| 292 | do {␊ |
| 293 | ++count;␊ |
| 294 | __asm__ volatile(␊ |
| 295 | ␉␉␉␉␉␉ "inb␉$0x61,%0"␊ |
| 296 | ␉␉␉␉␉␉ : "=a"(nmi_sc_val) /*:*/ /* no input */ /*:*/ /* no clobber */);␊ |
| 297 | } while( (nmi_sc_val & 0x20) == 0);␊ |
| 298 | return count;␊ |
| 299 | }␊ |
| 300 | ␊ |
| 301 | inline static void␊ |
| 302 | set_PIT2(int value)␊ |
| 303 | {␊ |
| 304 | /*␊ |
| 305 | * First, tell the clock we are going to write 16 bits to the counter␊ |
| 306 | * and enable one-shot mode (command 0xB8 to port 0x43)␊ |
| 307 | * Then write the two bytes into the PIT2 clock register (port 0x42).␊ |
| 308 | * Loop until the value is "realized" in the clock,␊ |
| 309 | * this happens on the next tick.␊ |
| 310 | */␊ |
| 311 | asm volatile(␊ |
| 312 | " movb $0xB8,%%al \n\t"␊ |
| 313 | " outb %%al,$0x43 \n\t"␊ |
| 314 | " movb %%dl,%%al \n\t"␊ |
| 315 | " outb %%al,$0x42 \n\t"␊ |
| 316 | " movb %%dh,%%al \n\t"␊ |
| 317 | " outb %%al,$0x42 \n"␊ |
| 318 | "1: inb $0x42,%%al \n\t" ␊ |
| 319 | " inb $0x42,%%al \n\t"␊ |
| 320 | " cmp %%al,%%dh \n\t"␊ |
| 321 | " jne 1b"␊ |
| 322 | : : "d"(value) : "%al");␊ |
| 323 | }␊ |
| 324 | ␊ |
| 325 | ␊ |
| 326 | inline static uint64_t␊ |
| 327 | get_PIT2(unsigned int *value)␊ |
| 328 | {␊ |
| 329 | register uint64_t result;␊ |
| 330 | /*␊ |
| 331 | * This routine first latches the time (command 0x80 to port 0x43),␊ |
| 332 | * then gets the time stamp so we know how long the read will take later.␊ |
| 333 | * Read (from port 0x42) and return the current value of the timer.␊ |
| 334 | */␊ |
| 335 | #ifdef __i386__␊ |
| 336 | asm volatile(␊ |
| 337 | " xorl %%ecx,%%ecx \n\t"␊ |
| 338 | " movb $0x80,%%al \n\t"␊ |
| 339 | " outb %%al,$0x43 \n\t"␊ |
| 340 | " rdtsc \n\t"␊ |
| 341 | " pushl %%eax \n\t"␊ |
| 342 | " inb $0x42,%%al \n\t"␊ |
| 343 | " movb %%al,%%cl \n\t"␊ |
| 344 | " inb $0x42,%%al \n\t"␊ |
| 345 | " movb %%al,%%ch \n\t"␊ |
| 346 | " popl %%eax "␊ |
| 347 | : "=A"(result), "=c"(*value));␊ |
| 348 | #else /* __x86_64__ */␊ |
| 349 | asm volatile(␊ |
| 350 | ␉␉" xorq %%rcx,%%rcx \n\t"␊ |
| 351 | ␉␉" movb $0x80,%%al \n\t"␊ |
| 352 | ␉␉" outb %%al,$0x43 \n\t"␊ |
| 353 | ␉␉" rdtsc \n\t"␊ |
| 354 | ␉␉" pushq %%rax \n\t"␊ |
| 355 | ␉␉" inb $0x42,%%al \n\t"␊ |
| 356 | ␉␉" movb %%al,%%cl \n\t"␊ |
| 357 | ␉␉" inb $0x42,%%al \n\t"␊ |
| 358 | ␉␉" movb %%al,%%ch \n\t"␊ |
| 359 | ␉␉" popq %%rax "␊ |
| 360 | ␉␉: "=A"(result), "=c"(*value));␊ |
| 361 | #endif␊ |
| 362 | ␊ |
| 363 | return result;␊ |
| 364 | }␊ |
| 365 | ␊ |
| 366 | #endif /* !__LIBSAIO_CPU_H */␊ |
| 367 | |
