netboot/cpu.h

#ifndef I386_BITS_CPU_H
#define I386_BITS_CPU_H


/* Sample usage: CPU_FEATURE_P(cpu.x86_capability, FPU) */
#define CPU_FEATURE_P(CAP, FEATURE) \
	(!!(CAP[(X86_FEATURE_##FEATURE)/32] & ((X86_FEATURE_##FEATURE) & 0x1f)))

#define NCAPINTS	4	/* Currently we have 4 32-bit words worth of info */

/* Intel-defined CPU features, CPUID level 0x00000001, word 0 */
#define X86_FEATURE_FPU		(0*32+ 0) /* Onboard FPU */
#define X86_FEATURE_VME		(0*32+ 1) /* Virtual Mode Extensions */
#define X86_FEATURE_DE		(0*32+ 2) /* Debugging Extensions */
#define X86_FEATURE_PSE 	(0*32+ 3) /* Page Size Extensions */
#define X86_FEATURE_TSC		(0*32+ 4) /* Time Stamp Counter */
#define X86_FEATURE_MSR		(0*32+ 5) /* Model-Specific Registers, RDMSR, WRMSR */
#define X86_FEATURE_PAE		(0*32+ 6) /* Physical Address Extensions */
#define X86_FEATURE_MCE		(0*32+ 7) /* Machine Check Architecture */
#define X86_FEATURE_CX8		(0*32+ 8) /* CMPXCHG8 instruction */
#define X86_FEATURE_APIC	(0*32+ 9) /* Onboard APIC */
#define X86_FEATURE_SEP		(0*32+11) /* SYSENTER/SYSEXIT */
#define X86_FEATURE_MTRR	(0*32+12) /* Memory Type Range Registers */
#define X86_FEATURE_PGE		(0*32+13) /* Page Global Enable */
#define X86_FEATURE_MCA		(0*32+14) /* Machine Check Architecture */
#define X86_FEATURE_CMOV	(0*32+15) /* CMOV instruction (FCMOVCC and FCOMI too if FPU present) */
#define X86_FEATURE_PAT		(0*32+16) /* Page Attribute Table */
#define X86_FEATURE_PSE36	(0*32+17) /* 36-bit PSEs */
#define X86_FEATURE_PN		(0*32+18) /* Processor serial number */
#define X86_FEATURE_CLFLSH	(0*32+19) /* Supports the CLFLUSH instruction */
#define X86_FEATURE_DTES	(0*32+21) /* Debug Trace Store */
#define X86_FEATURE_ACPI	(0*32+22) /* ACPI via MSR */
#define X86_FEATURE_MMX		(0*32+23) /* Multimedia Extensions */
#define X86_FEATURE_FXSR	(0*32+24) /* FXSAVE and FXRSTOR instructions (fast save and restore */
				          /* of FPU context), and CR4.OSFXSR available */
#define X86_FEATURE_XMM		(0*32+25) /* Streaming SIMD Extensions */
#define X86_FEATURE_XMM2	(0*32+26) /* Streaming SIMD Extensions-2 */
#define X86_FEATURE_SELFSNOOP	(0*32+27) /* CPU self snoop */
#define X86_FEATURE_HT		(0*32+28) /* Hyper-Threading */
#define X86_FEATURE_ACC		(0*32+29) /* Automatic clock control */
#define X86_FEATURE_IA64	(0*32+30) /* IA-64 processor */

/* AMD-defined CPU features, CPUID level 0x80000001, word 1 */
/* Don't duplicate feature flags which are redundant with Intel! */
#define X86_FEATURE_SYSCALL	(1*32+11) /* SYSCALL/SYSRET */
#define X86_FEATURE_MMXEXT	(1*32+22) /* AMD MMX extensions */
#define X86_FEATURE_LM		(1*32+29) /* Long Mode (x86-64) */
#define X86_FEATURE_3DNOWEXT	(1*32+30) /* AMD 3DNow! extensions */
#define X86_FEATURE_3DNOW	(1*32+31) /* 3DNow! */

/* Transmeta-defined CPU features, CPUID level 0x80860001, word 2 */
#define X86_FEATURE_RECOVERY	(2*32+ 0) /* CPU in recovery mode */
#define X86_FEATURE_LONGRUN	(2*32+ 1) /* Longrun power control */
#define X86_FEATURE_LRTI	(2*32+ 3) /* LongRun table interface */

/* Other features, Linux-defined mapping, word 3 */
/* This range is used for feature bits which conflict or are synthesized */
#define X86_FEATURE_CXMMX	(3*32+ 0) /* Cyrix MMX extensions */
#define X86_FEATURE_K6_MTRR	(3*32+ 1) /* AMD K6 nonstandard MTRRs */
#define X86_FEATURE_CYRIX_ARR	(3*32+ 2) /* Cyrix ARRs (= MTRRs) */
#define X86_FEATURE_CENTAUR_MCR	(3*32+ 3) /* Centaur MCRs (= MTRRs) */

#define MAX_X86_VENDOR_ID 16
struct cpuinfo_x86 {
	uint8_t	 x86;		/* CPU family */
	uint8_t	 x86_model;
	uint8_t	 x86_mask;

       	int	 cpuid_level;	/* Maximum supported CPUID level, -1=no CPUID */
	unsigned x86_capability[NCAPINTS];
	char	 x86_vendor_id[MAX_X86_VENDOR_ID];
};


#define X86_VENDOR_INTEL 0
#define X86_VENDOR_CYRIX 1
#define X86_VENDOR_AMD 2
#define X86_VENDOR_UMC 3
#define X86_VENDOR_NEXGEN 4
#define X86_VENDOR_CENTAUR 5
#define X86_VENDOR_RISE 6
#define X86_VENDOR_TRANSMETA 7
#define X86_VENDOR_NSC 8
#define X86_VENDOR_UNKNOWN 0xff

/*
 * EFLAGS bits
 */
#define X86_EFLAGS_CF	0x00000001 /* Carry Flag */
#define X86_EFLAGS_PF	0x00000004 /* Parity Flag */
#define X86_EFLAGS_AF	0x00000010 /* Auxillary carry Flag */
#define X86_EFLAGS_ZF	0x00000040 /* Zero Flag */
#define X86_EFLAGS_SF	0x00000080 /* Sign Flag */
#define X86_EFLAGS_TF	0x00000100 /* Trap Flag */
#define X86_EFLAGS_IF	0x00000200 /* Interrupt Flag */
#define X86_EFLAGS_DF	0x00000400 /* Direction Flag */
#define X86_EFLAGS_OF	0x00000800 /* Overflow Flag */
#define X86_EFLAGS_IOPL	0x00003000 /* IOPL mask */
#define X86_EFLAGS_NT	0x00004000 /* Nested Task */
#define X86_EFLAGS_RF	0x00010000 /* Resume Flag */
#define X86_EFLAGS_VM	0x00020000 /* Virtual Mode */
#define X86_EFLAGS_AC	0x00040000 /* Alignment Check */
#define X86_EFLAGS_VIF	0x00080000 /* Virtual Interrupt Flag */
#define X86_EFLAGS_VIP	0x00100000 /* Virtual Interrupt Pending */
#define X86_EFLAGS_ID	0x00200000 /* CPUID detection flag */

/*
 * Generic CPUID function
 */
static inline void cpuid(int op, 
	unsigned int *eax, unsigned int *ebx, unsigned int *ecx, unsigned int *edx)
{
	__asm__("cpuid"
		: "=a" (*eax),
		  "=b" (*ebx),
		  "=c" (*ecx),
		  "=d" (*edx)
		: "0" (op));
}

/*
 * CPUID functions returning a single datum
 */
static inline unsigned int cpuid_eax(unsigned int op)
{
	unsigned int eax;

	__asm__("cpuid"
		: "=a" (eax)
		: "0" (op)
		: "bx", "cx", "dx");
	return eax;
}
static inline unsigned int cpuid_ebx(unsigned int op)
{
	unsigned int eax, ebx;

	__asm__("cpuid"
		: "=a" (eax), "=b" (ebx)
		: "0" (op)
		: "cx", "dx" );
	return ebx;
}
static inline unsigned int cpuid_ecx(unsigned int op)
{
	unsigned int eax, ecx;

	__asm__("cpuid"
		: "=a" (eax), "=c" (ecx)
		: "0" (op)
		: "bx", "dx" );
	return ecx;
}
static inline unsigned int cpuid_edx(unsigned int op)
{
	unsigned int eax, edx;

	__asm__("cpuid"
		: "=a" (eax), "=d" (edx)
		: "0" (op)
		: "bx", "cx");
	return edx;
}

/*
 * Intel CPU features in CR4
 */
#define X86_CR4_VME		0x0001	/* enable vm86 extensions */
#define X86_CR4_PVI		0x0002	/* virtual interrupts flag enable */
#define X86_CR4_TSD		0x0004	/* disable time stamp at ipl 3 */
#define X86_CR4_DE		0x0008	/* enable debugging extensions */
#define X86_CR4_PSE		0x0010	/* enable page size extensions */
#define X86_CR4_PAE		0x0020	/* enable physical address extensions */
#define X86_CR4_MCE		0x0040	/* Machine check enable */
#define X86_CR4_PGE		0x0080	/* enable global pages */
#define X86_CR4_PCE		0x0100	/* enable performance counters at ipl 3 */
#define X86_CR4_OSFXSR		0x0200	/* enable fast FPU save and restore */
#define X86_CR4_OSXMMEXCPT	0x0400	/* enable unmasked SSE exceptions */


#define MSR_K6_EFER			0xC0000080
/* EFER bits: */ 
#define _EFER_SCE 0  /* SYSCALL/SYSRET */
#define _EFER_LME 8  /* Long mode enable */
#define _EFER_LMA 10 /* Long mode active (read-only) */
#define _EFER_NX 11  /* No execute enable */

#define EFER_SCE (1<<_EFER_SCE)
#define EFER_LME (1<<EFER_LME)
#define EFER_LMA (1<<EFER_LMA)
#define EFER_NX (1<<_EFER_NX)

#define rdmsr(msr,val1,val2) \
     __asm__ __volatile__("rdmsr" \
			  : "=a" (val1), "=d" (val2) \
			  : "c" (msr))

#define wrmsr(msr,val1,val2) \
     __asm__ __volatile__("wrmsr" \
			  : /* no outputs */ \
			  : "c" (msr), "a" (val1), "d" (val2))


#define read_cr0()	({ \
	unsigned int __dummy; \
	__asm__( \
		"movl %%cr0, %0\n\t" \
		:"=r" (__dummy)); \
	__dummy; \
})
#define write_cr0(x) \
	__asm__("movl %0,%%cr0": :"r" (x));

#define read_cr3()	({ \
	unsigned int __dummy; \
	__asm__( \
		"movl %%cr3, %0\n\t" \
		:"=r" (__dummy)); \
	__dummy; \
})
#define write_cr3x(x) \
	__asm__("movl %0,%%cr3": :"r" (x));


#define read_cr4()	({ \
	unsigned int __dummy; \
	__asm__( \
		"movl %%cr4, %0\n\t" \
		:"=r" (__dummy)); \
	__dummy; \
})
#define write_cr4x(x) \
	__asm__("movl %0,%%cr4": :"r" (x));


extern struct cpuinfo_x86 cpu_info;
#ifdef CONFIG_X86_64
extern void cpu_setup(void);
#else
#define cpu_setup() do {} while(0)
#endif

#endif /* I386_BITS_CPU_H */