| 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 | // DFE: These two constants come from Linux except CLOCK_TICK_RATE replaced with CLKNUM␊ |
| 14 | #define CALIBRATE_TIME_MSEC␉30␉␉/* 30 msecs */␊ |
| 15 | #define CALIBRATE_LATCH␉␉((CLKNUM * CALIBRATE_TIME_MSEC + 1000/2)/1000)␊ |
| 16 | ␊ |
| 17 | static inline uint64_t rdtsc64(void)␊ |
| 18 | {␊ |
| 19 | ␉uint64_t ret;␊ |
| 20 | ␉__asm__ volatile("rdtsc" : "=A" (ret));␊ |
| 21 | ␉return ret;␊ |
| 22 | }␊ |
| 23 | ␊ |
| 24 | static inline uint64_t rdmsr64(uint32_t msr)␊ |
| 25 | {␊ |
| 26 | uint64_t ret;␊ |
| 27 | __asm__ volatile("rdmsr" : "=A" (ret) : "c" (msr));␊ |
| 28 | return ret;␊ |
| 29 | }␊ |
| 30 | ␊ |
| 31 | static inline void wrmsr64(uint32_t msr, uint64_t val)␊ |
| 32 | {␊ |
| 33 | ␉__asm__ volatile("wrmsr" : : "c" (msr), "A" (val));␊ |
| 34 | }␊ |
| 35 | ␊ |
| 36 | static inline void intel_waitforsts(void) {␊ |
| 37 | ␉uint32_t inline_timeout = 100000;␊ |
| 38 | ␉while (rdmsr64(MSR_IA32_PERF_STATUS) & (1 << 21)) { if (!inline_timeout--) break; }␊ |
| 39 | }␊ |
| 40 | ␊ |
| 41 | static inline void do_cpuid(uint32_t selector, uint32_t *data)␊ |
| 42 | {␊ |
| 43 | ␉asm volatile ("cpuid"␊ |
| 44 | ␉␉␉␉ : "=a" (data[0]),␊ |
| 45 | ␉␉␉␉ "=b" (data[1]),␊ |
| 46 | ␉␉␉␉ "=c" (data[2]),␊ |
| 47 | ␉␉␉␉ "=d" (data[3])␊ |
| 48 | ␉␉␉␉ : "a" (selector));␊ |
| 49 | }␊ |
| 50 | ␊ |
| 51 | static inline void do_cpuid2(uint32_t selector, uint32_t selector2, uint32_t *data)␊ |
| 52 | {␊ |
| 53 | ␉asm volatile ("cpuid"␊ |
| 54 | ␉␉␉␉ : "=a" (data[0]),␊ |
| 55 | ␉␉␉␉ "=b" (data[1]),␊ |
| 56 | ␉␉␉␉ "=c" (data[2]),␊ |
| 57 | ␉␉␉␉ "=d" (data[3])␊ |
| 58 | ␉␉␉␉ : "a" (selector), "c" (selector2));␊ |
| 59 | }␊ |
| 60 | ␊ |
| 61 | // DFE: enable_PIT2 and disable_PIT2 come from older xnu␊ |
| 62 | ␊ |
| 63 | /*␊ |
| 64 | * Enable or disable timer 2.␊ |
| 65 | * Port 0x61 controls timer 2:␊ |
| 66 | * bit 0 gates the clock,␊ |
| 67 | * bit 1 gates output to speaker.␊ |
| 68 | */␊ |
| 69 | static inline void enable_PIT2(void)␊ |
| 70 | {␊ |
| 71 | /* Enable gate, disable speaker */␊ |
| 72 | __asm__ volatile(␊ |
| 73 | ␉␉␉␉␉ " inb $0x61,%%al \n\t"␊ |
| 74 | ␉␉␉␉␉ " and $0xFC,%%al \n\t" /* & ~0x03 */␊ |
| 75 | ␉␉␉␉␉ " or $1,%%al \n\t"␊ |
| 76 | ␉␉␉␉␉ " outb %%al,$0x61 \n\t"␊ |
| 77 | ␉␉␉␉␉ : : : "%al" );␊ |
| 78 | }␊ |
| 79 | ␊ |
| 80 | static inline void disable_PIT2(void)␊ |
| 81 | {␊ |
| 82 | /* Disable gate and output to speaker */␊ |
| 83 | __asm__ volatile(␊ |
| 84 | ␉␉␉␉␉ " inb $0x61,%%al \n\t"␊ |
| 85 | ␉␉␉␉␉ " and $0xFC,%%al \n\t"␉/* & ~0x03 */␊ |
| 86 | ␉␉␉␉␉ " outb %%al,$0x61 \n\t"␊ |
| 87 | ␉␉␉␉␉ : : : "%al" );␊ |
| 88 | }␊ |
| 89 | ␊ |
| 90 | // DFE: set_PIT2_mode0, poll_PIT2_gate, and measure_tsc_frequency are␊ |
| 91 | // roughly based on Linux code␊ |
| 92 | ␊ |
| 93 | /* Set the 8254 channel 2 to mode 0 with the specified value.␊ |
| 94 | In mode 0, the counter will initially set its gate low when the␊ |
| 95 | timer expires. For this to be useful, you ought to set it high␊ |
| 96 | before calling this function. The enable_PIT2 function does this.␊ |
| 97 | */␊ |
| 98 | static inline void set_PIT2_mode0(uint16_t value)␊ |
| 99 | {␊ |
| 100 | __asm__ volatile(␊ |
| 101 | ␉␉␉␉␉ " movb $0xB0,%%al \n\t"␊ |
| 102 | ␉␉␉␉␉ " outb␉%%al,$0x43␉\n\t"␊ |
| 103 | ␉␉␉␉␉ " movb␉%%dl,%%al␉\n\t"␊ |
| 104 | ␉␉␉␉␉ " outb␉%%al,$0x42␉\n\t"␊ |
| 105 | ␉␉␉␉␉ " movb␉%%dh,%%al␉\n\t"␊ |
| 106 | ␉␉␉␉␉ " outb␉%%al,$0x42"␊ |
| 107 | ␉␉␉␉␉ : : "d"(value) /*: no clobber */ );␊ |
| 108 | }␊ |
| 109 | ␊ |
| 110 | /* Returns the number of times the loop ran before the PIT2 signaled */␊ |
| 111 | static inline unsigned long poll_PIT2_gate(void)␊ |
| 112 | {␊ |
| 113 | unsigned long count = 0;␊ |
| 114 | unsigned char nmi_sc_val;␊ |
| 115 | do {␊ |
| 116 | ++count;␊ |
| 117 | __asm__ volatile(␊ |
| 118 | ␉␉␉␉␉␉ "inb␉$0x61,%0"␊ |
| 119 | ␉␉␉␉␉␉ : "=a"(nmi_sc_val) /*:*/ /* no input */ /*:*/ /* no clobber */);␊ |
| 120 | } while( (nmi_sc_val & 0x20) == 0);␊ |
| 121 | return count;␊ |
| 122 | }␊ |
| 123 | ␊ |
| 124 | inline static void␊ |
| 125 | set_PIT2(int value)␊ |
| 126 | {␊ |
| 127 | /*␊ |
| 128 | * First, tell the clock we are going to write 16 bits to the counter␊ |
| 129 | * and enable one-shot mode (command 0xB8 to port 0x43)␊ |
| 130 | * Then write the two bytes into the PIT2 clock register (port 0x42).␊ |
| 131 | * Loop until the value is "realized" in the clock,␊ |
| 132 | * this happens on the next tick.␊ |
| 133 | */␊ |
| 134 | asm volatile(␊ |
| 135 | " movb $0xB8,%%al \n\t"␊ |
| 136 | " outb %%al,$0x43 \n\t"␊ |
| 137 | " movb %%dl,%%al \n\t"␊ |
| 138 | " outb %%al,$0x42 \n\t"␊ |
| 139 | " movb %%dh,%%al \n\t"␊ |
| 140 | " outb %%al,$0x42 \n"␊ |
| 141 | "1: inb $0x42,%%al \n\t" ␊ |
| 142 | " inb $0x42,%%al \n\t"␊ |
| 143 | " cmp %%al,%%dh \n\t"␊ |
| 144 | " jne 1b"␊ |
| 145 | : : "d"(value) : "%al");␊ |
| 146 | }␊ |
| 147 | ␊ |
| 148 | ␊ |
| 149 | inline static uint64_t␊ |
| 150 | get_PIT2(unsigned int *value)␊ |
| 151 | {␊ |
| 152 | register uint64_t result;␊ |
| 153 | /*␊ |
| 154 | * This routine first latches the time (command 0x80 to port 0x43),␊ |
| 155 | * then gets the time stamp so we know how long the read will take later.␊ |
| 156 | * Read (from port 0x42) and return the current value of the timer.␊ |
| 157 | */␊ |
| 158 | #ifdef __i386__␊ |
| 159 | asm volatile(␊ |
| 160 | " xorl %%ecx,%%ecx \n\t"␊ |
| 161 | " movb $0x80,%%al \n\t"␊ |
| 162 | " outb %%al,$0x43 \n\t"␊ |
| 163 | " rdtsc \n\t"␊ |
| 164 | " pushl %%eax \n\t"␊ |
| 165 | " inb $0x42,%%al \n\t"␊ |
| 166 | " movb %%al,%%cl \n\t"␊ |
| 167 | " inb $0x42,%%al \n\t"␊ |
| 168 | " movb %%al,%%ch \n\t"␊ |
| 169 | " popl %%eax "␊ |
| 170 | : "=A"(result), "=c"(*value));␊ |
| 171 | #else /* __x86_64__ */␊ |
| 172 | asm volatile(␊ |
| 173 | ␉␉" xorq %%rcx,%%rcx \n\t"␊ |
| 174 | ␉␉" movb $0x80,%%al \n\t"␊ |
| 175 | ␉␉" outb %%al,$0x43 \n\t"␊ |
| 176 | ␉␉" rdtsc \n\t"␊ |
| 177 | ␉␉" pushq %%rax \n\t"␊ |
| 178 | ␉␉" inb $0x42,%%al \n\t"␊ |
| 179 | ␉␉" movb %%al,%%cl \n\t"␊ |
| 180 | ␉␉" inb $0x42,%%al \n\t"␊ |
| 181 | ␉␉" movb %%al,%%ch \n\t"␊ |
| 182 | ␉␉" popq %%rax "␊ |
| 183 | ␉␉: "=A"(result), "=c"(*value));␊ |
| 184 | #endif␊ |
| 185 | ␊ |
| 186 | return result;␊ |
| 187 | }␊ |
| 188 | ␊ |
| 189 | #endif /* !__LIBSAIO_CPU_H */␊ |
| 190 | |
