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author | Bin Meng <bmeng.cn@gmail.com> | 2015-06-23 04:18:49 (GMT) |
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committer | Simon Glass <sjg@chromium.org> | 2015-07-15 00:03:17 (GMT) |
commit | 3d232878289bf59e83c6b152407a01f6e0fb790b (patch) | |
tree | 55413b7266202a293c1df5d571e22700b2370485 /arch/x86/cpu/ioapic.c | |
parent | ba9091f55d68fc3d7b65a710f9d47c0be15e816d (diff) | |
download | u-boot-3d232878289bf59e83c6b152407a01f6e0fb790b.tar.xz |
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>
Diffstat (limited to 'arch/x86/cpu/ioapic.c')
-rw-r--r-- | arch/x86/cpu/ioapic.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/cpu/ioapic.c b/arch/x86/cpu/ioapic.c new file mode 100644 index 0000000..112a9c6 --- /dev/null +++ b/arch/x86/cpu/ioapic.c @@ -0,0 +1,21 @@ +/* + * 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); +} |