1 | /*␊ |
2 | * Copyright 2008 Islam Ahmed Zaid. All rights reserved. <azismed@gmail.com>␊ |
3 | * AsereBLN: 2009: cleanup and bugfix␊ |
4 | */␊ |
5 | ␊ |
6 | #include "libsaio.h"␊ |
7 | #include "platform.h"␊ |
8 | #include "cpu.h"␊ |
9 | ␊ |
10 | #ifndef DEBUG_CPU␊ |
11 | #define DEBUG_CPU 0␊ |
12 | #endif␊ |
13 | ␊ |
14 | #if DEBUG_CPU␊ |
15 | #define DBG(x...)␉␉printf(x)␊ |
16 | #else␊ |
17 | #define DBG(x...)␊ |
18 | #endif␊ |
19 | ␊ |
20 | /*␊ |
21 | * DFE: Measures the TSC frequency in Hz (64-bit) using the ACPI PM timer␊ |
22 | */␊ |
23 | static uint64_t measure_tsc_frequency(void)␊ |
24 | {␊ |
25 | uint64_t tscStart;␊ |
26 | uint64_t tscEnd;␊ |
27 | uint64_t tscDelta = 0xffffffffffffffffULL;␊ |
28 | unsigned long pollCount;␊ |
29 | uint64_t retval = 0;␊ |
30 | int i;␊ |
31 | ␊ |
32 | /* Time how many TSC ticks elapse in 30 msec using the 8254 PIT␊ |
33 | * counter 2. We run this loop 3 times to make sure the cache␊ |
34 | * is hot and we take the minimum delta from all of the runs.␊ |
35 | * That is to say that we're biased towards measuring the minimum␊ |
36 | * number of TSC ticks that occur while waiting for the timer to␊ |
37 | * expire. That theoretically helps avoid inconsistencies when␊ |
38 | * running under a VM if the TSC is not virtualized and the host␊ |
39 | * steals time. The TSC is normally virtualized for VMware.␊ |
40 | */␊ |
41 | for(i = 0; i < 10; ++i)␊ |
42 | {␊ |
43 | enable_PIT2();␊ |
44 | set_PIT2_mode0(CALIBRATE_LATCH);␊ |
45 | tscStart = rdtsc64();␊ |
46 | pollCount = poll_PIT2_gate();␊ |
47 | tscEnd = rdtsc64();␊ |
48 | /* The poll loop must have run at least a few times for accuracy */␊ |
49 | if(pollCount <= 1)␊ |
50 | continue;␊ |
51 | /* The TSC must increment at LEAST once every millisecond. We␊ |
52 | * should have waited exactly 30 msec so the TSC delta should␊ |
53 | * be >= 30. Anything less and the processor is way too slow.␊ |
54 | */␊ |
55 | if((tscEnd - tscStart) <= CALIBRATE_TIME_MSEC)␊ |
56 | continue;␊ |
57 | // tscDelta = min(tscDelta, (tscEnd - tscStart))␊ |
58 | if( (tscEnd - tscStart) < tscDelta )␊ |
59 | tscDelta = tscEnd - tscStart;␊ |
60 | }␊ |
61 | /* tscDelta is now the least number of TSC ticks the processor made in␊ |
62 | * a timespan of 0.03 s (e.g. 30 milliseconds)␊ |
63 | * Linux thus divides by 30 which gives the answer in kiloHertz because␊ |
64 | * 1 / ms = kHz. But we're xnu and most of the rest of the code uses␊ |
65 | * Hz so we need to convert our milliseconds to seconds. Since we're␊ |
66 | * dividing by the milliseconds, we simply multiply by 1000.␊ |
67 | */␊ |
68 | ␊ |
69 | /* Unlike linux, we're not limited to 32-bit, but we do need to take care␊ |
70 | * that we're going to multiply by 1000 first so we do need at least some␊ |
71 | * arithmetic headroom. For now, 32-bit should be enough.␊ |
72 | * Also unlike Linux, our compiler can do 64-bit integer arithmetic.␊ |
73 | */␊ |
74 | if(tscDelta > (1ULL<<32))␊ |
75 | retval = 0;␊ |
76 | else␊ |
77 | {␊ |
78 | retval = tscDelta * 1000 / 30;␊ |
79 | }␊ |
80 | disable_PIT2();␊ |
81 | return retval;␊ |
82 | }␊ |
83 | ␊ |
84 | /*␊ |
85 | * Calculates the FSB and CPU frequencies using specific MSRs for each CPU␊ |
86 | * - multi. is read from a specific MSR. In the case of Intel, there is:␊ |
87 | * a max multi. (used to calculate the FSB freq.),␊ |
88 | * and a current multi. (used to calculate the CPU freq.)␊ |
89 | * - fsbFrequency = tscFrequency / multi␊ |
90 | * - cpuFrequency = fsbFrequency * multi␊ |
91 | */␊ |
92 | ␊ |
93 | void scan_cpu(PlatformInfo_t *p)␊ |
94 | {␊ |
95 | ␉uint64_t␉tscFrequency, fsbFrequency, cpuFrequency;␊ |
96 | ␉uint64_t␉msr, flex_ratio;␊ |
97 | ␉uint8_t␉␉maxcoef, maxdiv, currcoef, currdiv;␊ |
98 | ␊ |
99 | ␉maxcoef = maxdiv = currcoef = currdiv = 0;␊ |
100 | ␊ |
101 | ␉/* get cpuid values */␊ |
102 | ␉do_cpuid(0x00000000, p->CPU.CPUID[CPUID_0]);␊ |
103 | ␉do_cpuid(0x00000001, p->CPU.CPUID[CPUID_1]);␊ |
104 | ␉do_cpuid(0x00000002, p->CPU.CPUID[CPUID_2]);␊ |
105 | ␉do_cpuid(0x00000003, p->CPU.CPUID[CPUID_3]);␊ |
106 | ␉do_cpuid2(0x00000004, 0, p->CPU.CPUID[CPUID_4]);␊ |
107 | ␉do_cpuid(0x80000000, p->CPU.CPUID[CPUID_80]);␊ |
108 | ␉if ((p->CPU.CPUID[CPUID_80][0] & 0x0000000f) >= 1) {␊ |
109 | ␉␉do_cpuid(0x80000001, p->CPU.CPUID[CPUID_81]);␊ |
110 | ␉}␊ |
111 | #if DEBUG_CPU␊ |
112 | ␉{␊ |
113 | ␉␉int␉␉i;␊ |
114 | ␉␉printf("CPUID Raw Values:\n");␊ |
115 | ␉␉for (i=0; i<CPUID_MAX; i++) {␊ |
116 | ␉␉␉printf("%02d: %08x-%08x-%08x-%08x\n", i,␊ |
117 | ␉␉␉␉p->CPU.CPUID[i][0], p->CPU.CPUID[i][1],␊ |
118 | ␉␉␉␉p->CPU.CPUID[i][2], p->CPU.CPUID[i][3]);␊ |
119 | ␉␉}␊ |
120 | ␉}␊ |
121 | #endif␊ |
122 | ␉p->CPU.Vendor␉␉= p->CPU.CPUID[CPUID_0][1];␊ |
123 | ␉p->CPU.Model␉␉= bitfield(p->CPU.CPUID[CPUID_1][0], 7, 4);␊ |
124 | ␉p->CPU.Family␉␉= bitfield(p->CPU.CPUID[CPUID_1][0], 11, 8);␊ |
125 | ␉p->CPU.ExtModel␉␉= bitfield(p->CPU.CPUID[CPUID_1][0], 19, 16);␊ |
126 | ␉p->CPU.ExtFamily␉= bitfield(p->CPU.CPUID[CPUID_1][0], 27, 20);␊ |
127 | ␉p->CPU.NoThreads␉= bitfield(p->CPU.CPUID[CPUID_1][1], 23, 16);␊ |
128 | ␉p->CPU.NoCores␉␉= bitfield(p->CPU.CPUID[CPUID_4][0], 31, 26) + 1;␊ |
129 | ␊ |
130 | ␉p->CPU.Model += (p->CPU.ExtModel << 4);␊ |
131 | ␊ |
132 | ␉/* setup features */␊ |
133 | ␉if ((bit(23) & p->CPU.CPUID[CPUID_1][3]) != 0) {␊ |
134 | ␉␉p->CPU.Features |= CPU_FEATURE_MMX;␊ |
135 | ␉}␊ |
136 | ␉if ((bit(25) & p->CPU.CPUID[CPUID_1][3]) != 0) {␊ |
137 | ␉␉p->CPU.Features |= CPU_FEATURE_SSE;␊ |
138 | ␉}␊ |
139 | ␉if ((bit(26) & p->CPU.CPUID[CPUID_1][3]) != 0) {␊ |
140 | ␉␉p->CPU.Features |= CPU_FEATURE_SSE2;␊ |
141 | ␉}␊ |
142 | ␉if ((bit(0) & p->CPU.CPUID[CPUID_1][2]) != 0) {␊ |
143 | ␉␉p->CPU.Features |= CPU_FEATURE_SSE3;␊ |
144 | ␉}␊ |
145 | ␉if ((bit(19) & p->CPU.CPUID[CPUID_1][2]) != 0) {␊ |
146 | ␉␉p->CPU.Features |= CPU_FEATURE_SSE41;␊ |
147 | ␉}␊ |
148 | ␉if ((bit(20) & p->CPU.CPUID[CPUID_1][2]) != 0) {␊ |
149 | ␉␉p->CPU.Features |= CPU_FEATURE_SSE42;␊ |
150 | ␉}␊ |
151 | ␉if ((bit(29) & p->CPU.CPUID[CPUID_81][3]) != 0) {␊ |
152 | ␉␉p->CPU.Features |= CPU_FEATURE_EM64T;␊ |
153 | ␉}␊ |
154 | ␉if ((bit(5) & p->CPU.CPUID[CPUID_1][3]) != 0) {␊ |
155 | ␉␉p->CPU.Features |= CPU_FEATURE_MSR;␊ |
156 | ␉}␊ |
157 | ␉//if ((bit(28) & p->CPU.CPUID[CPUID_1][3]) != 0) {␊ |
158 | ␉if (p->CPU.NoThreads > p->CPU.NoCores) {␊ |
159 | ␉␉p->CPU.Features |= CPU_FEATURE_HTT;␊ |
160 | ␉}␊ |
161 | ␊ |
162 | ␉tscFrequency = measure_tsc_frequency();␊ |
163 | ␉fsbFrequency = 0;␊ |
164 | ␉cpuFrequency = 0;␊ |
165 | ␊ |
166 | ␉if ((p->CPU.Vendor == 0x756E6547 /* Intel */) && ((p->CPU.Family == 0x06) || (p->CPU.Family == 0x0f))) {␊ |
167 | ␉␉if ((p->CPU.Family == 0x06 && p->CPU.Model >= 0x0c) || (p->CPU.Family == 0x0f && p->CPU.Model >= 0x03)) {␊ |
168 | ␉␉␉/* Nehalem CPU model */␊ |
169 | ␉␉␉if (p->CPU.Family == 0x06 && (p->CPU.Model == 0x1a || p->CPU.Model == 0x1e␊ |
170 | ␉␉␉ || p->CPU.Model == 0x1f || p->CPU.Model == 0x25 || p->CPU.Model == 0x2c)) {␊ |
171 | ␉␉␉␉msr = rdmsr64(MSR_PLATFORM_INFO);␊ |
172 | ␉␉␉␉DBG("msr(%d): platform_info %08x\n", __LINE__, msr & 0xffffffff);␊ |
173 | ␉␉␉␉currcoef = (msr >> 8) & 0xff;␊ |
174 | ␉␉␉␉msr = rdmsr64(MSR_FLEX_RATIO);␊ |
175 | ␉␉␉␉DBG("msr(%d): flex_ratio %08x\n", __LINE__, msr & 0xffffffff);␊ |
176 | ␉␉␉␉if ((msr >> 16) & 0x01) {␊ |
177 | ␉␉␉␉␉flex_ratio = (msr >> 8) & 0xff;␊ |
178 | ␉␉␉␉␉if (currcoef > flex_ratio) {␊ |
179 | ␉␉␉␉␉␉currcoef = flex_ratio;␊ |
180 | ␉␉␉␉␉}␊ |
181 | ␉␉␉␉}␊ |
182 | ␊ |
183 | ␉␉␉␉if (currcoef) {␊ |
184 | ␉␉␉␉␉fsbFrequency = (tscFrequency / currcoef);␊ |
185 | ␉␉␉␉}␊ |
186 | ␉␉␉␉cpuFrequency = tscFrequency;␊ |
187 | ␉␉␉} else {␊ |
188 | ␉␉␉␉msr = rdmsr64(MSR_IA32_PERF_STATUS);␊ |
189 | ␉␉␉␉DBG("msr(%d): ia32_perf_stat 0x%08x\n", __LINE__, msr & 0xffffffff);␊ |
190 | ␉␉␉␉currcoef = (msr >> 8) & 0x1f;␊ |
191 | ␉␉␉␉/* Non-integer bus ratio for the max-multi*/␊ |
192 | ␉␉␉␉maxdiv = (msr >> 46) & 0x01;␊ |
193 | ␉␉␉␉/* Non-integer bus ratio for the current-multi (undocumented)*/␊ |
194 | ␉␉␉␉currdiv = (msr >> 14) & 0x01;␊ |
195 | ␊ |
196 | ␉␉␉␉if ((p->CPU.Family == 0x06 && p->CPU.Model >= 0x0e) || (p->CPU.Family == 0x0f)) // This will always be model >= 3␊ |
197 | ␉␉␉␉{␊ |
198 | ␉␉␉␉␉/* On these models, maxcoef defines TSC freq */␊ |
199 | ␉␉␉␉␉maxcoef = (msr >> 40) & 0x1f;␊ |
200 | ␉␉␉␉} else {␊ |
201 | ␉␉␉␉␉/* On lower models, currcoef defines TSC freq */␊ |
202 | ␉␉␉␉␉/* XXX */␊ |
203 | ␉␉␉␉␉maxcoef = currcoef;␊ |
204 | ␉␉␉␉}␊ |
205 | ␊ |
206 | ␉␉␉␉if (maxcoef) {␊ |
207 | ␉␉␉␉␉if (maxdiv) {␊ |
208 | ␉␉␉␉␉␉fsbFrequency = ((tscFrequency * 2) / ((maxcoef * 2) + 1));␊ |
209 | ␉␉␉␉␉} else {␊ |
210 | ␉␉␉␉␉␉fsbFrequency = (tscFrequency / maxcoef);␊ |
211 | ␉␉␉␉␉}␊ |
212 | ␉␉␉␉␉if (currdiv) {␊ |
213 | ␉␉␉␉␉␉cpuFrequency = (fsbFrequency * ((currcoef * 2) + 1) / 2);␊ |
214 | ␉␉␉␉␉} else {␊ |
215 | ␉␉␉␉␉␉cpuFrequency = (fsbFrequency * currcoef);␊ |
216 | ␉␉␉␉␉}␊ |
217 | ␉␉␉␉␉DBG("max: %d%s current: %d%s\n", maxcoef, maxdiv ? ".5" : "",currcoef, currdiv ? ".5" : "");␊ |
218 | ␉␉␉␉}␊ |
219 | ␉␉␉}␊ |
220 | ␉␉}␊ |
221 | ␉␉/* Mobile CPU ? */␊ |
222 | ␉␉if (rdmsr64(0x17) & (1<<28)) {␊ |
223 | ␉␉␉p->CPU.Features |= CPU_FEATURE_MOBILE;␊ |
224 | ␉␉}␊ |
225 | ␉}␊ |
226 | #if 0␊ |
227 | ␉else if((p->CPU.Vendor == 0x68747541 /* AMD */) && (p->CPU.Family == 0x0f)) {␊ |
228 | ␉␉if(p->CPU.ExtFamily == 0x00 /* K8 */) {␊ |
229 | ␉␉␉msr = rdmsr64(K8_FIDVID_STATUS);␊ |
230 | ␉␉␉currcoef = (msr & 0x3f) / 2 + 4;␊ |
231 | ␉␉␉currdiv = (msr & 0x01) * 2;␊ |
232 | ␉␉} else if(p->CPU.ExtFamily >= 0x01 /* K10+ */) {␊ |
233 | ␉␉␉msr = rdmsr64(K10_COFVID_STATUS);␊ |
234 | ␉␉␉if(p->CPU.ExtFamily == 0x01 /* K10 */)␊ |
235 | ␉␉␉␉currcoef = (msr & 0x3f) + 0x10;␊ |
236 | ␉␉␉else /* K11+ */␊ |
237 | ␉␉␉␉currcoef = (msr & 0x3f) + 0x08;␊ |
238 | ␉␉␉currdiv = (2 << ((msr >> 6) & 0x07));␊ |
239 | ␉␉}␊ |
240 | ␊ |
241 | ␉␉if (currcoef) {␊ |
242 | ␉␉␉if (currdiv) {␊ |
243 | ␉␉␉␉fsbFrequency = ((tscFrequency * currdiv) / currcoef);␊ |
244 | ␉␉␉␉DBG("%d.%d\n", currcoef / currdiv, ((currcoef % currdiv) * 100) / currdiv);␊ |
245 | ␉␉␉} else {␊ |
246 | ␉␉␉␉fsbFrequency = (tscFrequency / currcoef);␊ |
247 | ␉␉␉␉DBG("%d\n", currcoef);␊ |
248 | ␉␉␉}␊ |
249 | ␉␉␉fsbFrequency = (tscFrequency / currcoef);␊ |
250 | ␉␉␉cpuFrequency = tscFrequency;␊ |
251 | ␉␉}␊ |
252 | ␉}␊ |
253 | ␊ |
254 | ␉if (!fsbFrequency) {␊ |
255 | ␉␉fsbFrequency = (DEFAULT_FSB * 1000);␊ |
256 | ␉␉cpuFrequency = tscFrequency;␊ |
257 | ␉␉DBG("0 ! using the default value for FSB !\n");␊ |
258 | ␉}␊ |
259 | #endif␊ |
260 | ␊ |
261 | ␉p->CPU.MaxCoef = maxcoef;␊ |
262 | ␉p->CPU.MaxDiv = maxdiv;␊ |
263 | ␉p->CPU.CurrCoef = currcoef;␊ |
264 | ␉p->CPU.CurrDiv = currdiv;␊ |
265 | ␉p->CPU.TSCFrequency = tscFrequency;␊ |
266 | ␉p->CPU.FSBFrequency = fsbFrequency;␊ |
267 | ␉p->CPU.CPUFrequency = cpuFrequency;␊ |
268 | #if DEBUG_CPU␊ |
269 | ␉DBG("CPU: Vendor/Model/ExtModel: 0x%x/0x%x/0x%x\n", p->CPU.Vendor, p->CPU.Model, p->CPU.ExtModel);␊ |
270 | ␉DBG("CPU: Family/ExtFamily: 0x%x/0x%x\n", p->CPU.Family, p->CPU.ExtFamily);␊ |
271 | ␉DBG("CPU: MaxCoef/CurrCoef: 0x%x/0x%x\n", p->CPU.MaxCoef, p->CPU.CurrCoef);␊ |
272 | ␉DBG("CPU: MaxDiv/CurrDiv: 0x%x/0x%x\n", p->CPU.MaxDiv, p->CPU.CurrDiv);␊ |
273 | ␉DBG("CPU: TSCFreq: %dMHz\n", p->CPU.TSCFrequency / 1000000);␊ |
274 | ␉DBG("CPU: FSBFreq: %dMHz\n", p->CPU.FSBFrequency / 1000000);␊ |
275 | ␉DBG("CPU: CPUFreq: %dMHz\n", p->CPU.CPUFrequency / 1000000);␊ |
276 | ␉DBG("CPU: NoCores/NoThreads: %d/%d\n", p->CPU.NoCores, p->CPU.NoThreads);␊ |
277 | ␉DBG("CPU: Features: 0x%08x\n", p->CPU.Features);␊ |
278 | ␉pause();␊ |
279 | #endif␊ |
280 | }␊ |
281 | |