Check CPUID info, switch cpu flag to Broadwell

src/kernel/cpu.h

@@ -0,0 +1,40 @@
+#pragma once
+
+
+class cpu_id
+{
+public:
+	struct regs {
+		uint32_t eax, ebx, ecx, edx;
+
+		regs() : eax(0), ebx(0), ecx(0), edx(0) {}
+		regs(uint32_t a, uint32_t b, uint32_t c, uint32_t d) : eax(a), ebx(b), ecx(c), edx(d) {}
+		regs(const regs &r) : eax(r.eax), ebx(r.ebx), ecx(r.ecx), edx(r.edx) {}
+
+		bool eax_bit(unsigned bit) { return (eax >> bit) & 0x1; }
+		bool ebx_bit(unsigned bit) { return (ebx >> bit) & 0x1; }
+		bool ecx_bit(unsigned bit) { return (ecx >> bit) & 0x1; }
+		bool edx_bit(unsigned bit) { return (edx >> bit) & 0x1; }
+	};
+
+	cpu_id();
+
+	regs get(uint32_t leaf, uint32_t sub = 0) const;
+
+	inline const char * vendor_id() const	{ return m_vendor_id; }
+	inline uint8_t cpu_type() const			{ return m_cpu_type; }
+	inline uint8_t stepping() const			{ return m_stepping; }
+	inline uint16_t family() const			{ return m_family; }
+	inline uint16_t model() const			{ return m_model; }
+
+private:
+	void read();
+
+	uint32_t m_high_leaf;
+	char m_vendor_id[13];
+
+	uint8_t m_cpu_type;
+	uint8_t m_stepping;
+	uint16_t m_family;
+	uint16_t m_model;
+};