linux_kernel/arch/x86/include/asm/invpcid.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_INVPCID
#define _ASM_X86_INVPCID

static inline void __invpcid(unsigned long pcid, unsigned long addr,
			     unsigned long type)
{
	struct { u64 d[2]; } desc = { { pcid, addr } };

	/*
	 * The memory clobber is because the whole point is to invalidate
	 * stale TLB entries and, especially if we're flushing global
	 * mappings, we don't want the compiler to reorder any subsequent
	 * memory accesses before the TLB flush.
	 *
	 * The hex opcode is invpcid (%ecx), %eax in 32-bit mode and
	 * invpcid (%rcx), %rax in long mode.
	 */
	asm volatile (".byte 0x66, 0x0f, 0x38, 0x82, 0x01"
		      : : "m" (desc), "a" (type), "c" (&desc) : "memory");
}

#define INVPCID_TYPE_INDIV_ADDR		0
#define INVPCID_TYPE_SINGLE_CTXT	1
#define INVPCID_TYPE_ALL_INCL_GLOBAL	2
#define INVPCID_TYPE_ALL_NON_GLOBAL	3

/* Flush all mappings for a given pcid and addr, not including globals. */
static inline void invpcid_flush_one(unsigned long pcid,
				     unsigned long addr)
{
	__invpcid(pcid, addr, INVPCID_TYPE_INDIV_ADDR);
}

/* Flush all mappings for a given PCID, not including globals. */
static inline void invpcid_flush_single_context(unsigned long pcid)
{
	__invpcid(pcid, 0, INVPCID_TYPE_SINGLE_CTXT);
}

/* Flush all mappings, including globals, for all PCIDs. */
static inline void invpcid_flush_all(void)
{
	__invpcid(0, 0, INVPCID_TYPE_ALL_INCL_GLOBAL);
}

/* Flush all mappings for all PCIDs except globals. */
static inline void invpcid_flush_all_nonglobals(void)
{
	__invpcid(0, 0, INVPCID_TYPE_ALL_NON_GLOBAL);
}

#endif /* _ASM_X86_INVPCID */