diff options
| -rw-r--r-- | src/device/oprom/realmode/x86.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/src/device/oprom/realmode/x86.c b/src/device/oprom/realmode/x86.c index 7972011a3f..367614db2b 100644 --- a/src/device/oprom/realmode/x86.c +++ b/src/device/oprom/realmode/x86.c @@ -2,6 +2,7 @@ #include <device/mmio.h> #include <arch/interrupt.h> +#include <arch/null_breakpoint.h> #include <arch/registers.h> #include <boot/coreboot_tables.h> #include <console/console.h> @@ -178,15 +179,21 @@ static void setup_realmode_idt(void) struct realmode_idt *idts = (struct realmode_idt *) 0; int i; + /* It's expected that we write to the NULL page in the first two iterations of the + following loop, so temporarily disable the NULL breakpoint. */ + null_breakpoint_disable(); + /* Copy IDT stub code for each interrupt. This might seem wasteful * but it is really simple */ - for (i = 0; i < 256; i++) { + for (i = 0; i < 256; i++) { idts[i].cs = 0; idts[i].offset = 0x1000 + (i * __idt_handler_size); write_idt_stub((void *)((uintptr_t)idts[i].offset), i); } + null_breakpoint_init(); + /* Many option ROMs use the hard coded interrupt entry points in the * system bios. So install them at the known locations. */ |