arch/x86/include/asm/processor.h

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * (C) Copyright 2002
 * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
 */

#ifndef __ASM_PROCESSOR_H_
#define __ASM_PROCESSOR_H_ 1

#define X86_GDT_ENTRY_SIZE		8

#define X86_GDT_ENTRY_NULL		0
#define X86_GDT_ENTRY_UNUSED		1
#define X86_GDT_ENTRY_32BIT_CS		2
#define X86_GDT_ENTRY_32BIT_DS		3
#define X86_GDT_ENTRY_32BIT_FS		4
#define X86_GDT_ENTRY_16BIT_CS		5
#define X86_GDT_ENTRY_16BIT_DS		6
#define X86_GDT_ENTRY_16BIT_FLAT_CS	7
#define X86_GDT_ENTRY_16BIT_FLAT_DS	8
#define X86_GDT_NUM_ENTRIES		9

#define X86_GDT_SIZE		(X86_GDT_NUM_ENTRIES * X86_GDT_ENTRY_SIZE)

/* Length of the public header on Intel microcode blobs */
#define UCODE_HEADER_LEN	0x30

/*
 * This register is documented in (for example) the Intel Atom Processor E3800
 * Product Family Datasheet in "PCU - Power Management Controller (PMC)".
 *
 * RST_CNT: Reset Control Register (RST_CNT) Offset cf9.
 *
 * The naming follows Intel's naming.
 */
#define IO_PORT_RESET		0xcf9

#define SYS_RST		(1 << 1)	/* 0 for soft reset, 1 for hard reset */
#define RST_CPU		(1 << 2)	/* initiate reset */
#define FULL_RST	(1 << 3)	/* full power cycle */

#ifndef __ASSEMBLY__

static inline __attribute__((always_inline)) void cpu_hlt(void)
{
	asm("hlt");
}

static inline ulong cpu_get_sp(void)
{
	ulong result;

	asm volatile(
		"mov %%esp, %%eax"
		: "=a" (result));
	return result;
}

#endif /* __ASSEMBLY__ */

#endif