30 lines
655 B
C++
30 lines
655 B
C++
#include "common/cpu.h"
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#include <cpuid.h>
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#include "debug/debug.h"
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void ProbeCpuAndEnableFeatures() {
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dbgln("CPUID");
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uint32_t eax, ebx, ecx, edx;
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__get_cpuid(1, &eax, &ebx, &ecx, &edx);
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if (!(edx & (0x3 << 25))) {
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panic("SSE & SSE2 not available.");
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}
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if (!(ecx & (0x1 | (0x1 << 9)))) {
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panic("SSE3, SSSE3 not available.");
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}
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dbgln("Setting SSE");
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asm volatile(
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"mov %%cr0, %%rax;"
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"and $0xFFFB, %%ax;" // Clear EM
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"or $0x2, %%ax;" // Set MP
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"mov %%rax, %%cr0;"
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"mov %%cr4, %%rax;"
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"or $0x600, %%ax;" // Set OSFXSR, OSXMMEXCPT
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"mov %%rax, %%cr4;" ::
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: "rax");
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}
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