[pxe] Enable interrupts before starting PXE NBP execution

Based on a patch provided by XenSource for Etherboot 5.4.

diff --git a/src/arch/i386/interface/pxe/pxe_call.c b/src/arch/i386/interface/pxe/pxe_call.c
index 3ccb7fb5a37363d39b7a7182636ef9f842220c7d..7122c4eb8d317e8fb9bf96578196dee16c5d40d8 100644 (file)
--- a/src/arch/i386/interface/pxe/pxe_call.c
+++ b/src/arch/i386/interface/pxe/pxe_call.c
@@ -440,6 +440,7 @@ int pxe_start_nbp ( void ) {
        __asm__ __volatile__ ( REAL_CODE ( "pushw %%cx\n\t"
                                           "pushw %%ax\n\t"
                                           "movw %%cx, %%es\n\t"
+                                          "sti\n\t"
                                           "lcall $0, $0x7c00\n\t"
                                           "addw $4, %%sp\n\t" )
                               : "=a" ( rc ), "=b" ( discard_b ),