src/include/cpu/x86/cr.h

/* SPDX-License-Identifier: GPL-2.0-only */

#ifndef CPU_X86_CR_H
#define CPU_X86_CR_H

#if !defined(__ASSEMBLER__)

#include <stdint.h>

#define COMPILER_BARRIER "memory"

#if ENV_X86_64
#define CRx_TYPE uint64_t
#define CRx_IN   "q"
#define CRx_RET  "=q"
#else
#define CRx_TYPE uint32_t
#define CRx_IN   "r"
#define CRx_RET  "=r"
#endif
static __always_inline CRx_TYPE read_cr0(void)
{
	CRx_TYPE value;
	__asm__ __volatile__ (
		"mov %%cr0, %0"
		: CRx_RET(value)
		:
		: COMPILER_BARRIER
	);
	return value;
}

static __always_inline void write_cr0(CRx_TYPE data)
{
	__asm__ __volatile__ (
		"mov %0, %%cr0"
		:
		: CRx_IN(data)
		: COMPILER_BARRIER
	);
}

static __always_inline CRx_TYPE read_cr2(void)
{
	CRx_TYPE value;
	__asm__ __volatile__ (
		"mov %%cr2, %0"
		: CRx_RET(value)
		:
		: COMPILER_BARRIER
	);
	return value;
}

static __always_inline CRx_TYPE read_cr3(void)
{
	CRx_TYPE value;
	__asm__ __volatile__ (
		"mov %%cr3, %0"
		: CRx_RET(value)
		:
		: COMPILER_BARRIER
	);
	return value;
}

static __always_inline void write_cr3(CRx_TYPE data)
{
	__asm__ __volatile__ (
		"mov %0, %%cr3"
		:
		: CRx_IN(data)
		: COMPILER_BARRIER
	);
}
static __always_inline CRx_TYPE read_cr4(void)
{
	CRx_TYPE value;
	__asm__ __volatile__ (
		"mov %%cr4, %0"
		: CRx_RET(value)
		:
		: COMPILER_BARRIER
	);
	return value;
}

static __always_inline void write_cr4(CRx_TYPE data)
{
	__asm__ __volatile__ (
		"mov %0, %%cr4"
		:
		: CRx_IN(data)
		: COMPILER_BARRIER
	);
}

#endif /* !defined(__ASSEMBLER__) */

/* CR0 flags */
#define CR0_PE		(1 <<  0)
#define CR0_MP		(1 <<  1)
#define CR0_EM		(1 <<  2)
#define CR0_TS		(1 <<  3)
#define CR0_ET		(1 <<  4)
#define CR0_NE		(1 <<  5)
#define CR0_WP		(1 << 16)
#define CR0_AM		(1 << 18)
#define CR0_NW		(1 << 29)
#define CR0_CD		(1 << 30)
#define CR0_PG		(1 << 31)

/* CR4 flags */
#define CR4_VME		(1 <<  0)
#define CR4_PVI		(1 <<  1)
#define CR4_TSD		(1 <<  2)
#define CR4_DE		(1 <<  3)
#define CR4_PSE		(1 <<  4)
#define CR4_PAE		(1 <<  5)
#define CR4_MCE		(1 <<  6)
#define CR4_PGE		(1 <<  7)
#define CR4_PCE		(1 <<  8)
#define CR4_OSFXSR	(1 <<  9)
#define CR4_OSXMMEXCPT	(1 << 10)
#define CR4_VMXE	(1 << 13)
#define CR4_SMXE	(1 << 14)
#define CR4_FSGSBASE	(1 << 16)
#define CR4_PCIDE	(1 << 17)
#define CR4_OSXSAVE	(1 << 18)
#define CR4_SMEP	(1 << 20)

#endif /* CPU_X86_CR_H */