diff options
| author | Raul E Rangel <rrangel@chromium.org> | 2018-08-22 10:03:05 -0600 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2018-08-23 16:24:44 +0000 |
| commit | cf79c8344d007cf05bc45d064ffed87be36f7513 (patch) | |
| tree | 08143b418801cf671796f913e7aaa6bd1c847e8d | |
| parent | 052b5317dafade3884eb63aacd5960dcce871945 (diff) | |
libpayload/x86/exception: Add methods to enable/disable interrupts
Will be used by the APIC.
BUG=b:109749762
TEST=Verified by the other cls in the stack.
Change-Id: Id86f2719d98a90318ac625e09601e5dbb06e3765
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Reviewed-on: https://review.coreboot.org/28239
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
| -rw-r--r-- | payloads/libpayload/arch/x86/exception.c | 32 | ||||
| -rw-r--r-- | payloads/libpayload/include/x86/arch/exception.h | 4 |
2 files changed, 36 insertions, 0 deletions
diff --git a/payloads/libpayload/arch/x86/exception.c b/payloads/libpayload/arch/x86/exception.c index b562660910..fe50d09c51 100644 --- a/payloads/libpayload/arch/x86/exception.c +++ b/payloads/libpayload/arch/x86/exception.c @@ -32,6 +32,8 @@ #include <libpayload.h> #include <stdint.h> +#define IF_FLAG (1 << 9) + u32 exception_stack[0x400] __attribute__((aligned(8))); static exception_hook hook; @@ -182,3 +184,33 @@ void exception_install_hook(exception_hook h) die_if(hook, "Implement support for a list of hooks if you need it."); hook = h; } + +static uint32_t eflags(void) +{ + uint32_t eflags; + asm volatile( + "pushf\n\t" + "pop %0\n\t" + : "=rm" (eflags)); + return eflags; +} + +void enable_interrupts(void) +{ + asm volatile ( + "sti\n" + : : : "cc" + ); +} +void disable_interrupts(void) +{ + asm volatile ( + "cli\n" + : : : "cc" + ); +} + +int interrupts_enabled(void) +{ + return !!(eflags() & IF_FLAG); +} diff --git a/payloads/libpayload/include/x86/arch/exception.h b/payloads/libpayload/include/x86/arch/exception.h index 8acdb09552..a6c2afcf0d 100644 --- a/payloads/libpayload/include/x86/arch/exception.h +++ b/payloads/libpayload/include/x86/arch/exception.h @@ -34,6 +34,10 @@ void exception_init_asm(void); void exception_dispatch(void); +void enable_interrupts(void); +void disable_interrupts(void); +/** Returns 1 if interrupts are enabled. */ +int interrupts_enabled(void); struct exception_state { |