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authorRaul E Rangel <rrangel@chromium.org>2018-10-01 14:34:31 -0600
committerMartin Roth <martinroth@google.com>2018-10-04 15:24:20 +0000
commitb025de0ddbe6d39f035b3ca01fb682bfe11cf497 (patch)
tree1feeb6ac4d1f2c6539050ed1b92149e66bb87a63 /payloads/libpayload
parent06125ebe8775c1f0002644215b5892ed5938ef76 (diff)
downloadcoreboot-b025de0ddbe6d39f035b3ca01fb682bfe11cf497.tar.xz
libpayload/apic: Only ACK interrupts triggered by the APIC
Only set end of interrupt (EOI) when the APIC In-Service vector matches the interrupt vector. This makes it so we don't EOI a non APIC interrupt. BUG=b:116777191 TEST=Booted grunt with APIC enabled and verified depthcharge still works. Change-Id: I00bd1e7a0fcf2fc004feadc40d22ebfefe68b384 Signed-off-by: Raul E Rangel <rrangel@chromium.org> Reviewed-on: https://review.coreboot.org/28879 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'payloads/libpayload')
-rw-r--r--payloads/libpayload/arch/x86/apic.c23
-rw-r--r--payloads/libpayload/arch/x86/exception.c17
-rw-r--r--payloads/libpayload/include/x86/arch/apic.h2
3 files changed, 27 insertions, 15 deletions
diff --git a/payloads/libpayload/arch/x86/apic.c b/payloads/libpayload/arch/x86/apic.c
index 048cc66fb8..3b294cbb94 100644
--- a/payloads/libpayload/arch/x86/apic.c
+++ b/payloads/libpayload/arch/x86/apic.c
@@ -58,6 +58,8 @@
#define APIC_TIMER_INIT_COUNT 0x380
#define APIC_TIMER_CUR_COUNT 0x390
#define APIC_TIMER_DIV_CFG 0x3E0
+#define APIC_ISR_0 0x100
+#define APIC_ISR_OFFSET 0x010
#define APIC_LVT_SIZE 0x010
@@ -141,11 +143,28 @@ static void timer_interrupt_handler(u8 vector)
timer_waiting = 0;
}
-void apic_eoi(void)
+void apic_eoi(uint8_t vector)
{
die_if(!apic_bar, "APIC is not initialized");
- apic_write32(APIC_EOI, 0);
+ /*
+ * Local and I/O APICs support 240 vectors (in the range of 16 to 255)
+ * as valid interrupts.
+ */
+ if (vector <= 15)
+ return;
+
+ /* Each bank handles 32 vectors */
+ uint8_t bank = vector / 32;
+
+ uint32_t offset = APIC_ISR_0 + bank * APIC_ISR_OFFSET;
+
+ uint32_t mask = apic_read32(offset);
+
+ uint8_t shift = vector % 32;
+
+ if (mask & (1 << shift))
+ apic_write32(APIC_EOI, 0);
}
static enum APIC_CAPABILITY apic_capabilities(void)
diff --git a/payloads/libpayload/arch/x86/exception.c b/payloads/libpayload/arch/x86/exception.c
index 2691c85329..3cd95bbde2 100644
--- a/payloads/libpayload/arch/x86/exception.c
+++ b/payloads/libpayload/arch/x86/exception.c
@@ -34,13 +34,6 @@
#include <arch/apic.h>
#define IF_FLAG (1 << 9)
-/*
- * Local and I/O APICs support 240 vectors (in the range of 16 to 255) as valid
- * interrupts. The Intel 64 and IA-32 architectures reserve vectors 16
- * through 31 for predefined interrupts, exceptions, and Intel-reserved
- * encodings.
-*/
-#define FIRST_USER_DEFINED_VECTOR 32
u32 exception_stack[0x400] __attribute__((aligned(8)));
@@ -173,15 +166,15 @@ static void dump_exception_state(void)
void exception_dispatch(void)
{
- u32 vec = exception_state->vector;
+ die_if(exception_state->vector >= ARRAY_SIZE(handlers),
+ "Invalid vector %u\n", exception_state->vector);
- die_if(vec >= ARRAY_SIZE(handlers), "Invalid vector %u\n", vec);
+ u8 vec = exception_state->vector;
if (handlers[vec]) {
handlers[vec](vec);
- if (IS_ENABLED(CONFIG_LP_ENABLE_APIC)
- && vec >= FIRST_USER_DEFINED_VECTOR)
- apic_eoi();
+ if (IS_ENABLED(CONFIG_LP_ENABLE_APIC))
+ apic_eoi(vec);
return;
}
diff --git a/payloads/libpayload/include/x86/arch/apic.h b/payloads/libpayload/include/x86/arch/apic.h
index c28fc0f5d1..1eb35089bd 100644
--- a/payloads/libpayload/include/x86/arch/apic.h
+++ b/payloads/libpayload/include/x86/arch/apic.h
@@ -38,7 +38,7 @@ void apic_init(void);
uint8_t apic_id(void);
/** Signal the end of the interrupt handler. */
-void apic_eoi(void);
+void apic_eoi(uint8_t vector);
void apic_delay(unsigned int usec);