From 1cb1611fc6e6223b5281e5e0187855eb0b9f719d Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Fri, 11 Mar 2016 22:07:34 -0700 Subject: [PATCH] x86: Add a function to set the IOAPIC ID Add a function to set the ID in the IOAPIC. Signed-off-by: Simon Glass Reviewed-by: Bin Meng --- arch/x86/cpu/ioapic.c | 16 ++++++++++++++++ arch/x86/include/asm/ioapic.h | 2 ++ 2 files changed, 18 insertions(+) diff --git a/arch/x86/cpu/ioapic.c b/arch/x86/cpu/ioapic.c index 112a9c63b4..d15e86c1c5 100644 --- a/arch/x86/cpu/ioapic.c +++ b/arch/x86/cpu/ioapic.c @@ -7,6 +7,7 @@ #include #include #include +#include u32 io_apic_read(u32 reg) { @@ -19,3 +20,18 @@ void io_apic_write(u32 reg, u32 val) writel(reg, IO_APIC_INDEX); 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)); + } +} diff --git a/arch/x86/include/asm/ioapic.h b/arch/x86/include/asm/ioapic.h index 77c443e9f5..2feed864fe 100644 --- a/arch/x86/include/asm/ioapic.h +++ b/arch/x86/include/asm/ioapic.h @@ -39,4 +39,6 @@ u32 io_apic_read(u32 reg); */ void io_apic_write(u32 reg, u32 val); +void io_apic_set_id(int ioapic_id); + #endif -- 2.25.1