Karina
55ea8fc533
build: updated CMakeLists to build and copy to initramfs wip(syscalls): initial syscalls chore(ksh/kfetch): minor changes chore(gitignore): added initramfs/*
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-3.0-or-later
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// Copyright (c) 2026 0xKarinyash
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#include "types.h"
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#include <cpuinfo.h>
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#define MSR_GS_BASE 0xC0000101
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#define MSR_KERNEL_GS_BASE 0xC0000102
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cpu_info g_cpu = {0};
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static inline void cpuid(u32 leaf, u32 subleaf, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx) {
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__asm__ volatile("cpuid"
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: "=a"(*eax), "=b"(*ebx), "=c"(*ecx), "=d"(*edx)
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: "a"(leaf), "c"(subleaf)
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);
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}
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static inline void wrmsr(u32 msr, u64 val) {
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u32 low = (u32)val;
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u32 high = (u32)(val >> 32);
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__asm__ volatile("wrmsr" :: "a"(low), "d"(high), "c"(msr));
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}
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void cpuinfo_init(u64 kernel_stack_top) {
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g_cpu.kernel_rsp = kernel_stack_top;
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g_cpu.self = (u64)&g_cpu;
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wrmsr(MSR_KERNEL_GS_BASE, (u64)&g_cpu);
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u32 eax, ebx, ecx, edx;
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cpuid(0, 0, &eax, &ebx, &ecx, &edx);
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u32* vendor_ptr = (u32*)g_cpu.vendor;
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vendor_ptr[0] = ebx;
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vendor_ptr[1] = edx;
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vendor_ptr[2] = ecx;
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g_cpu.vendor[12] = '\0';
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cpuid(1, 0, &eax, &ebx, &ecx, &edx);
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g_cpu.family = (eax >> 8) & 0xF;
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g_cpu.model = (eax >> 4) & 0xF;
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if (g_cpu.family == 6 || g_cpu.family == 15) {
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g_cpu.model += ((eax >> 16) & 0xF) << 4;
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}
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if (edx & (1 << 0)) g_cpu.features |= CPU_FEAT_FPU;
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if (edx & (1 << 4)) g_cpu.features |= CPU_FEAT_TSC;
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if (edx & (1 << 5)) g_cpu.features |= CPU_FEAT_MSR;
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if (edx & (1 << 6)) g_cpu.features |= CPU_FEAT_PAE;
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if (edx & (1 << 9)) g_cpu.features |= CPU_FEAT_APIC;
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if (edx & (1 << 12)) g_cpu.features |= CPU_FEAT_MTRR;
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if (edx & (1 << 25)) g_cpu.features |= CPU_FEAT_SSE;
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if (edx & (1 << 26)) g_cpu.features |= CPU_FEAT_SSE2;
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if (ecx & (1 << 0)) g_cpu.features |= CPU_FEAT_SSE3;
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if (ecx & (1 << 9)) g_cpu.features |= CPU_FEAT_SSSE3;
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if (ecx & (1 << 19)) g_cpu.features |= CPU_FEAT_SSE4_1;
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if (ecx & (1 << 20)) g_cpu.features |= CPU_FEAT_SSE4_2;
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if (ecx & (1 << 28)) g_cpu.features |= CPU_FEAT_AVX;
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if (ecx & (1 << 29)) g_cpu.features |= CPU_FEAT_F16C;
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if (ecx & (1 << 30)) g_cpu.features |= CPU_FEAT_RDRAND;
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if (ecx & (1 << 31)) g_cpu.features |= CPU_FEAT_HYPERVISOR;
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}
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bool cpu_has(u64 feature) {
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return (g_cpu.features & feature) != 0;
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} |