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authorRaul E Rangel <rrangel@chromium.org>2018-08-20 11:14:44 -0600
committerMartin Roth <martinroth@google.com>2018-09-12 14:14:46 +0000
commitac8ebd0e73774c83bfa5cb3dd460c662000e0d19 (patch)
tree793e8e859456e8bca38f9d14887fdbc05c08158b /payloads/libpayload/arch/x86/exception.c
parent3d398ad37af84bdbe15e5dc82d39213b8437dd12 (diff)
downloadcoreboot-ac8ebd0e73774c83bfa5cb3dd460c662000e0d19.tar.xz
libpayload/arch/x86: Add support for initializing the APIC
This is just the bare minimum required to initialize the APIC. I only support xAPIC and chose not to support x2APIC. We can add that functionality later when it's required. I also made the exception dispatcher call apic_eoi so that the callbacks won't forget to call it. BUG=b:109749762 TEST=Booted grunt and verified that depthcharge continued to function and that linux booted correctly. Also verified GDB still works. Change-Id: I420a4eadae84df088525e727b481089ef615183f Signed-off-by: Raul E Rangel <rrangel@chromium.org> Reviewed-on: https://review.coreboot.org/28241 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'payloads/libpayload/arch/x86/exception.c')
-rw-r--r--payloads/libpayload/arch/x86/exception.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/payloads/libpayload/arch/x86/exception.c b/payloads/libpayload/arch/x86/exception.c
index d70d942a05..2691c85329 100644
--- a/payloads/libpayload/arch/x86/exception.c
+++ b/payloads/libpayload/arch/x86/exception.c
@@ -31,8 +31,16 @@
#include <exception.h>
#include <libpayload.h>
#include <stdint.h>
+#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)));
@@ -171,6 +179,9 @@ void exception_dispatch(void)
if (handlers[vec]) {
handlers[vec](vec);
+ if (IS_ENABLED(CONFIG_LP_ENABLE_APIC)
+ && vec >= FIRST_USER_DEFINED_VECTOR)
+ apic_eoi();
return;
}