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x86: Add a function to set the IOAPIC ID

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Add a function to set the ID in the IOAPIC.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2016-03-11 22:07:34 -07:00 • committed by Bin Meng
parent f21069ff8a
commit 1cb1611fc6
2 changed files with 18 additions and 0 deletions
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16
arch/x86/cpu/ioapic.c
View file

@ -7,6 +7,7 @@
#include <common.h> #include <common.h>
#include <asm/io.h> #include <asm/io.h>
#include <asm/ioapic.h> #include <asm/ioapic.h>
#include <asm/lapic.h>
u32 io_apic_read(u32 reg) u32 io_apic_read(u32 reg)
{ {
@ -19,3 +20,18 @@ void io_apic_write(u32 reg, u32 val)
writel(reg, IO_APIC_INDEX); writel(reg, IO_APIC_INDEX);
writel(val, IO_APIC_DATA); writel(val, IO_APIC_DATA);
} }
void io_apic_set_id(int ioapic_id)
{
int bsp_lapicid = lapicid();
debug("IOAPIC: Initialising IOAPIC at %08x\n", IO_APIC_ADDR);
debug("IOAPIC: Bootstrap Processor Local APIC = %#02x\n", bsp_lapicid);
if (ioapic_id) {
debug("IOAPIC: ID = 0x%02x\n", ioapic_id);
/* Set IOAPIC ID if it has been specified */
io_apic_write(0x00, (io_apic_read(0x00) & 0xf0ffffff) |
(ioapic_id << 24));
}
}

2
arch/x86/include/asm/ioapic.h
View file

@ -39,4 +39,6 @@ u32 io_apic_read(u32 reg);
*/ */
void io_apic_write(u32 reg, u32 val); void io_apic_write(u32 reg, u32 val);
void io_apic_set_id(int ioapic_id);
#endif #endif