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libpayload/apic: Register a spurious interrupt vector 

We should have a spurious interrupt vector just incase we get one. The
handler doesn't need to do anything.

BUG=b:116777191
TEST=Booted depthcharge on grunt and inspected the register. I can't
generate a spurious interrupt, so I can't validate that the handler gets
called.

Change-Id: I9e49e617f4375eb5eb00d0715c1902f77e2bf284
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Reviewed-on: https://review.coreboot.org/28880
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
This commit is contained in:
Raul E Rangel 2018-10-01 15:14:11 -06:00 committed by Martin Roth
parent b025de0ddb
commit ad37763a5f
1 changed files with 21 additions and 2 deletions
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23
payloads/libpayload/arch/x86/apic.c
View File

@ -42,7 +42,6 @@
#define XAPIC_ENABLED_BIT (1 << 11)
#define X2APIC_ENABLED_BIT (1 << 10)
#define APIC_MASKED_BIT (1 << 16)
#define APIC_SW_ENABLED_BIT (1 << 8)
#define APIC_ID 0x020
#define APIC_ID_SHIFT 24
@ -54,6 +53,9 @@
#define APIC_TASK_PRIORITY_MASK 0xFFUL
#define APIC_EOI 0x0B0
#define APIC_SPURIOUS 0x0F0
#define APIC_SW_ENABLED_BIT (1 << 8)
#define APIC_SPURIOUS_VECTOR_MASK 0xFFUL
#define APIC_SPURIOUS 0x0F0
#define APIC_LVT_TIMER 0x320
#define APIC_TIMER_INIT_COUNT 0x380
#define APIC_TIMER_CUR_COUNT 0x390
@ -63,7 +65,8 @@
#define APIC_LVT_SIZE 0x010
#define APIC_TIMER_VECTOR 0x20
#define APIC_TIMER_VECTOR 0x20UL
#define APIC_SPURIOUS_VECTOR 0xFFUL
static uint32_t apic_bar;
static int _apic_initialized;
@ -143,6 +146,8 @@ static void timer_interrupt_handler(u8 vector)
timer_waiting = 0;
}
static void suprious_interrupt_handler(u8 vector) {}
void apic_eoi(uint8_t vector)
{
die_if(!apic_bar, "APIC is not initialized");
@ -255,6 +260,17 @@ static void apic_sw_enable(void)
apic_write32(APIC_SPURIOUS, reg);
}
static void apic_setup_spurious(void)
{
uint32_t reg = apic_read32(APIC_SPURIOUS);
reg &= ~APIC_SPURIOUS_VECTOR_MASK;
reg |= APIC_SPURIOUS_VECTOR;
apic_write32(APIC_SPURIOUS, reg);
}
void apic_init(void)
{
uint64_t apic_bar_reg;
@ -274,12 +290,15 @@ void apic_init(void)
apic_reset_all_lvts();
apic_set_task_priority(0);
apic_setup_spurious();
apic_sw_enable();
apic_init_timer();
set_interrupt_handler(APIC_TIMER_VECTOR, &timer_interrupt_handler);
set_interrupt_handler(APIC_SPURIOUS_VECTOR,
&suprious_interrupt_handler);
_apic_initialized = 1;