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3b3857548c
The new CPU_FEATURE_WRN macro in the cpu features list will cause the kernel to emit a warning but not panic if the feature is missing.
113 lines
2.8 KiB
C++
113 lines
2.8 KiB
C++
#include <stdint.h>
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#include "cpu/cpu_id.h"
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namespace cpu {
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inline static void
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__cpuid(
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uint32_t leaf,
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uint32_t subleaf,
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uint32_t *eax,
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uint32_t *ebx = nullptr,
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uint32_t *ecx = nullptr,
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uint32_t *edx = nullptr)
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{
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uint32_t a, b, c, d;
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__asm__ __volatile__ ( "cpuid"
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: "=a"(a), "=b"(b), "=c"(c), "=d"(d)
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: "a"(leaf), "c"(subleaf)
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);
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if (eax) *eax = a;
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if (ebx) *ebx = b;
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if (ecx) *ecx = c;
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if (edx) *edx = d;
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}
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cpu_id::cpu_id()
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{
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__cpuid(0, 0,
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&m_high_basic,
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reinterpret_cast<uint32_t *>(&m_vendor_id[0]),
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reinterpret_cast<uint32_t *>(&m_vendor_id[8]),
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reinterpret_cast<uint32_t *>(&m_vendor_id[4]));
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__cpuid(cpuid_extended, 0, &m_high_ext);
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}
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features
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cpu_id::features() const
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{
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::cpu::features feats;
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uint32_t leaf = -1u;
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uint32_t sub = -1u;
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regs r;
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#define CPU_FEATURE_OPT(name, feat_leaf, feat_sub, regname, bit) \
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if (leaf != feat_leaf || sub != feat_sub) { \
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leaf = feat_leaf; sub = feat_sub; r = get(leaf, sub); \
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} \
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if (r.regname & (1ull << bit)) \
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feats.set(feature::name);
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#define CPU_FEATURE_WRN(name, feat_leaf, feat_sub, regname, bit) \
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CPU_FEATURE_OPT(name, feat_leaf, feat_sub, regname, bit);
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#define CPU_FEATURE_REQ(name, feat_leaf, feat_sub, regname, bit) \
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CPU_FEATURE_OPT(name, feat_leaf, feat_sub, regname, bit);
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#include "cpu/features.inc"
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#undef CPU_FEATURE_OPT
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#undef CPU_FEATURE_REQ
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#undef CPU_FEATURE_WRN
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return feats;
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}
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cpu_id::regs
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cpu_id::get(uint32_t leaf, uint32_t sub) const
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{
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regs ret {0, 0, 0, 0};
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if ((leaf & cpuid_extended) == 0 && leaf > m_high_basic) return ret;
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if ((leaf & cpuid_extended) != 0 && leaf > m_high_ext) return ret;
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__cpuid(leaf, sub, &ret.eax, &ret.ebx, &ret.ecx, &ret.edx);
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return ret;
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}
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uint8_t
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cpu_id::local_apic_id() const
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{
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uint32_t eax_unused;
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uint32_t ebx;
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__cpuid(1, 0, &eax_unused, &ebx);
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return static_cast<uint8_t>(ebx >> 24);
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}
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bool
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cpu_id::brand_name(char *buffer) const
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{
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if (m_high_ext < cpuid_extended + 4)
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return false;
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__cpuid(cpuid_extended + 2, 0,
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reinterpret_cast<uint32_t *>(&buffer[0]),
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reinterpret_cast<uint32_t *>(&buffer[4]),
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reinterpret_cast<uint32_t *>(&buffer[8]),
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reinterpret_cast<uint32_t *>(&buffer[12]));
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__cpuid(cpuid_extended + 3, 0,
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reinterpret_cast<uint32_t *>(&buffer[16]),
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reinterpret_cast<uint32_t *>(&buffer[20]),
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reinterpret_cast<uint32_t *>(&buffer[24]),
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reinterpret_cast<uint32_t *>(&buffer[28]));
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__cpuid(cpuid_extended + 4, 0,
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reinterpret_cast<uint32_t *>(&buffer[32]),
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reinterpret_cast<uint32_t *>(&buffer[36]),
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reinterpret_cast<uint32_t *>(&buffer[40]),
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reinterpret_cast<uint32_t *>(&buffer[44]));
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return true;
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}
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}
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