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SubjectRe: [RFC PATCH 14/32] x86/fred: header file with FRED definitions

> +/*
> + * FRED return instructions
> + *
> + * Replace with "ERETS"/"ERETU" once binutils support FRED return instructions.

binutils version that supports these instructions goes here...

> + */
> +#define ERETS _ASM_BYTES(0xf2,0x0f,0x01,0xca)
> +#define ERETU _ASM_BYTES(0xf3,0x0f,0x01,0xca)
> +
> +/*
> + * Event stack level macro for the FRED_STKLVLS MSR.
> + * Usage example: FRED_STKLVL(X86_TRAP_DF, 3)
> + * Multiple values can be ORd together.
> + */
> +#define FRED_STKLVL(v,l) (_AT(unsigned long, l) << (2*(v)))
> +
> +/* FRED_CONFIG MSR */
> +#define FRED_CONFIG_CSL_MASK 0x3
> +#define FRED_CONFIG_SHADOW_STACK_SPACE _BITUL(3)
> +#define FRED_CONFIG_REDZONE(b) __ALIGN_KERNEL_MASK((b), _UL(0x3f))
> +#define FRED_CONFIG_INT_STKLVL(l) (_AT(unsigned long, l) << 9)
> +#define FRED_CONFIG_ENTRYPOINT(p) _AT(unsigned long, (p))
> +
> +/* FRED event type and vector bit width and counts */
> +#define FRED_EVENT_TYPE_BITS 3 /* only 3 bits used in FRED 3.0 */
> +#define FRED_EVENT_TYPE_COUNT _BITUL(FRED_EVENT_TYPE_BITS)
> +#define FRED_EVENT_VECTOR_BITS 8
> +#define FRED_EVENT_VECTOR_COUNT _BITUL(FRED_EVENT_VECTOR_BITS)
> +
> +/* FRED EVENT_TYPE_OTHER vector numbers */
> +#define FRED_SYSCALL 1
> +#define FRED_SYSENTER 2
> +
> +/* Flags above the CS selector (regs->csl) */
> +#define FRED_CSL_ENABLE_NMI _BITUL(28)
> +#define FRED_CSL_ALLOW_SINGLE_STEP _BITUL(25)
> +#define FRED_CSL_INTERRUPT_SHADOW _BITUL(24)

What's the state of IBT WAIT-FOR-ENDBR vs this? That really should also
get a high CS bit.

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