u-boot/arch/x86/cpu/ioapic.c
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

21 lines
353 B
C

/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/ioapic.h>
u32 io_apic_read(u32 reg)
{
writel(reg, IO_APIC_INDEX);
return readl(IO_APIC_DATA);
}
void io_apic_write(u32 reg, u32 val)
{
writel(reg, IO_APIC_INDEX);
writel(val, IO_APIC_DATA);
}