arch/x86/include/uapi/asm/processor-flags.h

Source file repositories/reference/linux-study-clean/arch/x86/include/uapi/asm/processor-flags.h

File Facts

System
Linux kernel
Corpus path
arch/x86/include/uapi/asm/processor-flags.h
Extension
.h
Size
7444 bytes
Lines
184
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _UAPI_ASM_X86_PROCESSOR_FLAGS_H
#define _UAPI_ASM_X86_PROCESSOR_FLAGS_H
/* Various flags defined: can be included from assembler. */

#include <linux/const.h>

/*
 * EFLAGS bits
 */
#define X86_EFLAGS_CF_BIT	0 /* Carry Flag */
#define X86_EFLAGS_CF		_BITUL(X86_EFLAGS_CF_BIT)
#define X86_EFLAGS_FIXED_BIT	1 /* Bit 1 - always on */
#define X86_EFLAGS_FIXED	_BITUL(X86_EFLAGS_FIXED_BIT)
#define X86_EFLAGS_PF_BIT	2 /* Parity Flag */
#define X86_EFLAGS_PF		_BITUL(X86_EFLAGS_PF_BIT)
#define X86_EFLAGS_AF_BIT	4 /* Auxiliary carry Flag */
#define X86_EFLAGS_AF		_BITUL(X86_EFLAGS_AF_BIT)
#define X86_EFLAGS_ZF_BIT	6 /* Zero Flag */
#define X86_EFLAGS_ZF		_BITUL(X86_EFLAGS_ZF_BIT)
#define X86_EFLAGS_SF_BIT	7 /* Sign Flag */
#define X86_EFLAGS_SF		_BITUL(X86_EFLAGS_SF_BIT)
#define X86_EFLAGS_TF_BIT	8 /* Trap Flag */
#define X86_EFLAGS_TF		_BITUL(X86_EFLAGS_TF_BIT)
#define X86_EFLAGS_IF_BIT	9 /* Interrupt Flag */
#define X86_EFLAGS_IF		_BITUL(X86_EFLAGS_IF_BIT)
#define X86_EFLAGS_DF_BIT	10 /* Direction Flag */
#define X86_EFLAGS_DF		_BITUL(X86_EFLAGS_DF_BIT)
#define X86_EFLAGS_OF_BIT	11 /* Overflow Flag */
#define X86_EFLAGS_OF		_BITUL(X86_EFLAGS_OF_BIT)
#define X86_EFLAGS_IOPL_BIT	12 /* I/O Privilege Level (2 bits) */
#define X86_EFLAGS_IOPL		(_AC(3,UL) << X86_EFLAGS_IOPL_BIT)
#define X86_EFLAGS_NT_BIT	14 /* Nested Task */
#define X86_EFLAGS_NT		_BITUL(X86_EFLAGS_NT_BIT)
#define X86_EFLAGS_RF_BIT	16 /* Resume Flag */
#define X86_EFLAGS_RF		_BITUL(X86_EFLAGS_RF_BIT)
#define X86_EFLAGS_VM_BIT	17 /* Virtual Mode */
#define X86_EFLAGS_VM		_BITUL(X86_EFLAGS_VM_BIT)
#define X86_EFLAGS_AC_BIT	18 /* Alignment Check/Access Control */
#define X86_EFLAGS_AC		_BITUL(X86_EFLAGS_AC_BIT)
#define X86_EFLAGS_VIF_BIT	19 /* Virtual Interrupt Flag */
#define X86_EFLAGS_VIF		_BITUL(X86_EFLAGS_VIF_BIT)
#define X86_EFLAGS_VIP_BIT	20 /* Virtual Interrupt Pending */
#define X86_EFLAGS_VIP		_BITUL(X86_EFLAGS_VIP_BIT)
#define X86_EFLAGS_ID_BIT	21 /* CPUID detection */
#define X86_EFLAGS_ID		_BITUL(X86_EFLAGS_ID_BIT)

/*
 * Basic CPU control in CR0
 */
#define X86_CR0_PE_BIT		0 /* Protection Enable */
#define X86_CR0_PE		_BITUL(X86_CR0_PE_BIT)
#define X86_CR0_MP_BIT		1 /* Monitor Coprocessor */
#define X86_CR0_MP		_BITUL(X86_CR0_MP_BIT)
#define X86_CR0_EM_BIT		2 /* Emulation */
#define X86_CR0_EM		_BITUL(X86_CR0_EM_BIT)
#define X86_CR0_TS_BIT		3 /* Task Switched */
#define X86_CR0_TS		_BITUL(X86_CR0_TS_BIT)
#define X86_CR0_ET_BIT		4 /* Extension Type */
#define X86_CR0_ET		_BITUL(X86_CR0_ET_BIT)
#define X86_CR0_NE_BIT		5 /* Numeric Error */
#define X86_CR0_NE		_BITUL(X86_CR0_NE_BIT)
#define X86_CR0_WP_BIT		16 /* Write Protect */
#define X86_CR0_WP		_BITUL(X86_CR0_WP_BIT)
#define X86_CR0_AM_BIT		18 /* Alignment Mask */
#define X86_CR0_AM		_BITUL(X86_CR0_AM_BIT)
#define X86_CR0_NW_BIT		29 /* Not Write-through */
#define X86_CR0_NW		_BITUL(X86_CR0_NW_BIT)
#define X86_CR0_CD_BIT		30 /* Cache Disable */
#define X86_CR0_CD		_BITUL(X86_CR0_CD_BIT)
#define X86_CR0_PG_BIT		31 /* Paging */
#define X86_CR0_PG		_BITUL(X86_CR0_PG_BIT)

/*
 * Paging options in CR3
 */
#define X86_CR3_PWT_BIT		3 /* Page Write Through */
#define X86_CR3_PWT		_BITUL(X86_CR3_PWT_BIT)
#define X86_CR3_PCD_BIT		4 /* Page Cache Disable */
#define X86_CR3_PCD		_BITUL(X86_CR3_PCD_BIT)

#define X86_CR3_PCID_BITS	12
#define X86_CR3_PCID_MASK	(_AC((1UL << X86_CR3_PCID_BITS) - 1, UL))

#define X86_CR3_LAM_U57_BIT	61 /* Activate LAM for userspace, 62:57 bits masked */
#define X86_CR3_LAM_U57		_BITULL(X86_CR3_LAM_U57_BIT)
#define X86_CR3_LAM_U48_BIT	62 /* Activate LAM for userspace, 62:48 bits masked */
#define X86_CR3_LAM_U48		_BITULL(X86_CR3_LAM_U48_BIT)
#define X86_CR3_PCID_NOFLUSH_BIT 63 /* Preserve old PCID */
#define X86_CR3_PCID_NOFLUSH    _BITULL(X86_CR3_PCID_NOFLUSH_BIT)

Annotation

Implementation Notes