Kernel: Implement 'cpuid' and enumerations for features

kernel/arch/i386/CPUID.cpp

@@ -0,0 +1,49 @@
+#include <kernel/CPUID.h>
+
+namespace CPUID
+{
+	void get_cpuid(uint32_t code, uint32_t* out)
+	{
+		asm volatile("cpuid" : "=a"(out[0]), "=b"(out[1]), "=c"(out[2]), "=d"(out[3]) : "a"(code));
+	}
+
+	void get_cpuid_string(uint32_t code, uint32_t* out)
+	{
+		asm volatile ("cpuid": "=a"(out[0]), "=b"(out[0]), "=d"(out[1]), "=c"(out[2]) : "a"(code));
+	}
+
+	bool IsAvailable()
+	{
+		uint32_t res;
+		asm volatile(
+			"pushfl;"
+			"pushfl;"
+			"popl %0;"
+			"xorl %1, %0;"
+			"pushl %0;"
+			"popfl;"
+			"pushfl;"
+			"popl %0;"
+			"popfl;"
+			: "=r"(res)
+			: "i" (0x00200000));
+		return res != 0;
+	}
+
+	const char* GetVendor()
+	{
+		static char vendor[13] {};
+		get_cpuid_string(0x00, (uint32_t*)vendor);
+		vendor[12] = '\0';
+		return vendor;
+	}
+
+	void GetFeatures(uint32_t& ecx, uint32_t& edx)
+	{
+		uint32_t buffer[4] {};
+		get_cpuid(0x01, buffer);
+		ecx = buffer[2];
+		edx = buffer[3];
+	}
+
+}

kernel/arch/i386/make.config

@@ -6,6 +6,7 @@ KERNEL_ARCH_LIBS=
 KERNEL_ARCH_OBJS=\
 $(ARCHDIR)/boot.o \
 $(ARCHDIR)/tty.o \
+$(ARCHDIR)/CPUID.o \
 $(ARCHDIR)/GDT.o \
 $(ARCHDIR)/GDT_asm.o \
 $(ARCHDIR)/IDT.o \