1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
4 */
5
6 #include <common.h>
7 #include <log.h>
8 #include <asm/io.h>
9 #include <asm/ioapic.h>
10 #include <asm/lapic.h>
11
io_apic_read(u32 reg)12 u32 io_apic_read(u32 reg)
13 {
14 writel(reg, IO_APIC_INDEX);
15 return readl(IO_APIC_DATA);
16 }
17
io_apic_write(u32 reg,u32 val)18 void io_apic_write(u32 reg, u32 val)
19 {
20 writel(reg, IO_APIC_INDEX);
21 writel(val, IO_APIC_DATA);
22 }
23
io_apic_set_id(int ioapic_id)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 }
38