]> git.sur5r.net Git - u-boot/blob - arch/x86/cpu/ioapic.c
x86: Add a function to set the IOAPIC ID
[u-boot] / arch / x86 / cpu / ioapic.c
1 /*
2  * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
3  *
4  * SPDX-License-Identifier:     GPL-2.0+
5  */
6
7 #include <common.h>
8 #include <asm/io.h>
9 #include <asm/ioapic.h>
10 #include <asm/lapic.h>
11
12 u32 io_apic_read(u32 reg)
13 {
14         writel(reg, IO_APIC_INDEX);
15         return readl(IO_APIC_DATA);
16 }
17
18 void io_apic_write(u32 reg, u32 val)
19 {
20         writel(reg, IO_APIC_INDEX);
21         writel(val, IO_APIC_DATA);
22 }
23
24 void io_apic_set_id(int ioapic_id)
25 {
26         int bsp_lapicid = lapicid();
27
28         debug("IOAPIC: Initialising IOAPIC at %08x\n", IO_APIC_ADDR);
29         debug("IOAPIC: Bootstrap Processor Local APIC = %#02x\n", bsp_lapicid);
30
31         if (ioapic_id) {
32                 debug("IOAPIC: ID = 0x%02x\n", ioapic_id);
33                 /* Set IOAPIC ID if it has been specified */
34                 io_apic_write(0x00, (io_apic_read(0x00) & 0xf0ffffff) |
35                               (ioapic_id << 24));
36         }
37 }