u-boot/arch/x86/include/asm/processor-flags.h

#ifndef _ASM_X86_PROCESSOR_FLAGS_H
#define _ASM_X86_PROCESSOR_FLAGS_H
/* Various flags defined: can be included from assembler. */

/*
 * 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 */

/*
 * Basic CPU control in CR0
 */
#define X86_CR0_PE	0x00000001 /* Protection Enable */
#define X86_CR0_MP	0x00000002 /* Monitor Coprocessor */
#define X86_CR0_EM	0x00000004 /* Emulation */
#define X86_CR0_TS	0x00000008 /* Task Switched */
#define X86_CR0_ET	0x00000010 /* Extension Type */
#define X86_CR0_NE	0x00000020 /* Numeric Error */
#define X86_CR0_WP	0x00010000 /* Write Protect */
#define X86_CR0_AM	0x00040000 /* Alignment Mask */
#define X86_CR0_NW	0x20000000 /* Not Write-through */
#define X86_CR0_CD	0x40000000 /* Cache Disable */
#define X86_CR0_PG	0x80000000 /* Paging */

/*
 * Paging options in CR3
 */
#define X86_CR3_PWT	0x00000008 /* Page Write Through */
#define X86_CR3_PCD	0x00000010 /* Page Cache Disable */

/*
 * Intel CPU features in CR4
 */
#define X86_CR4_VME	0x00000001 /* enable vm86 extensions */
#define X86_CR4_PVI	0x00000002 /* virtual interrupts flag enable */
#define X86_CR4_TSD	0x00000004 /* disable time stamp at ipl 3 */
#define X86_CR4_DE	0x00000008 /* enable debugging extensions */
#define X86_CR4_PSE	0x00000010 /* enable page size extensions */
#define X86_CR4_PAE	0x00000020 /* enable physical address extensions */
#define X86_CR4_MCE	0x00000040 /* Machine check enable */
#define X86_CR4_PGE	0x00000080 /* enable global pages */
#define X86_CR4_PCE	0x00000100 /* enable performance counters at ipl 3 */
#define X86_CR4_OSFXSR	0x00000200 /* enable fast FPU save and restore */
#define X86_CR4_OSXMMEXCPT 0x00000400 /* enable unmasked SSE exceptions */
#define X86_CR4_VMXE	0x00002000 /* enable VMX virtualization */
#define X86_CR4_OSXSAVE 0x00040000 /* enable xsave and xrestore */

/*
 * x86-64 Task Priority Register, CR8
 */
#define X86_CR8_TPR	0x0000000F /* task priority register */

/*
 * AMD and Transmeta use MSRs for configuration; see <asm/msr-index.h>
 */

/*
 *      NSC/Cyrix CPU configuration register indexes
 */
#define CX86_PCR0	0x20
#define CX86_GCR	0xb8
#define CX86_CCR0	0xc0
#define CX86_CCR1	0xc1
#define CX86_CCR2	0xc2
#define CX86_CCR3	0xc3
#define CX86_CCR4	0xe8
#define CX86_CCR5	0xe9
#define CX86_CCR6	0xea
#define CX86_CCR7	0xeb
#define CX86_PCR1	0xf0
#define CX86_DIR0	0xfe
#define CX86_DIR1	0xff
#define CX86_ARR_BASE	0xc4
#define CX86_RCR_BASE	0xdc

#ifdef __KERNEL__
#ifdef CONFIG_VM86
#define X86_VM_MASK	X86_EFLAGS_VM
#else
#define X86_VM_MASK	0 /* No VM86 support */
#endif
#endif

#endif /* _ASM_X86_PROCESSOR_FLAGS_H */