u-boot/arch/x86/include/asm/ioapic.h
Bin Meng 3d23287828 x86: Add I/O APIC register access routines
I/O APIC registers are addressed indirectly. Add io_apic_read() and
io_apic_write() routines to help register access. Two macros for I/O
APIC ID and version register offset are also added.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
2015-07-14 18:03:17 -06:00

42 lines
899 B
C

/*
* From coreboot file of the same name
*
* Copyright (C) 2010 coresystems GmbH
*
* SPDX-License-Identifier: GPL-2.0
*/
#ifndef __ASM_IOAPIC_H
#define __ASM_IOAPIC_H
#define IO_APIC_ADDR 0xfec00000
/* Direct addressed register */
#define IO_APIC_INDEX (IO_APIC_ADDR + 0x00)
#define IO_APIC_DATA (IO_APIC_ADDR + 0x10)
/* Indirect addressed register offset */
#define IO_APIC_ID 0x00
#define IO_APIC_VER 0x01
/**
* io_apic_read() - Read I/O APIC register
*
* This routine reads I/O APIC indirect addressed register.
*
* @reg: address of indirect addressed register
* @return: register value to read
*/
u32 io_apic_read(u32 reg);
/**
* io_apic_write() - Write I/O APIC register
*
* This routine writes I/O APIC indirect addressed register.
*
* @reg: address of indirect addressed register
* @val: register value to write
*/
void io_apic_write(u32 reg, u32 val);
#endif