diff options
Diffstat (limited to 'payloads/libpayload/arch/x86')
| -rw-r--r-- | payloads/libpayload/arch/x86/apic.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/payloads/libpayload/arch/x86/apic.c b/payloads/libpayload/arch/x86/apic.c index 3b294cbb94..db81ea1163 100644 --- a/payloads/libpayload/arch/x86/apic.c +++ b/payloads/libpayload/arch/x86/apic.c @@ -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; |