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[librm] Allow interrupts in protected mode

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When running in a virtual machine, switching to real mode may be
expensive.  Allow interrupts to be enabled while in protected mode and
reflected down to the real-mode interrupt handlers.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-04-28 20:17:15 +01:00
parent 4413ab4f5a
commit 23b671daf4
9 changed files with 322 additions and 135 deletions
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28
src/arch/i386/core/gdbmach.c
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@@ -24,6 +24,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <assert.h>
#include <ipxe/uaccess.h>
#include <ipxe/gdbstub.h>
#include <librm.h>
#include <gdbmach.h>
/** @file
@@ -150,3 +151,30 @@ __asmcall void gdbmach_handler ( int signo, gdbreg_t *regs ) {
gdbstub_handler ( signo, regs );
gdbmach_enable_hwbps();
}
static void * gdbmach_interrupt_vectors[] = {
gdbmach_nocode_sigfpe, /* Divide by zero */
gdbmach_nocode_sigtrap, /* Debug trap */
NULL, /* Non-maskable interrupt */
gdbmach_nocode_sigtrap, /* Breakpoint */
gdbmach_nocode_sigstkflt, /* Overflow */
gdbmach_nocode_sigstkflt, /* Bound range exceeded */
gdbmach_nocode_sigill, /* Invalid opcode */
NULL, /* Device not available */
gdbmach_withcode_sigbus, /* Double fault */
NULL, /* Coprocessor segment overrun */
gdbmach_withcode_sigsegv, /* Invalid TSS */
gdbmach_withcode_sigsegv, /* Segment not present */
gdbmach_withcode_sigsegv, /* Stack segment fault */
gdbmach_withcode_sigsegv, /* General protection fault */
gdbmach_withcode_sigsegv, /* Page fault */
};
void gdbmach_init ( void ) {
unsigned int i;
for ( i = 0 ; i < ( sizeof ( gdbmach_interrupt_vectors ) /
sizeof ( gdbmach_interrupt_vectors[0] ) ) ; i++ ) {
set_interrupt_vector ( i, gdbmach_interrupt_vectors[i] );
}
}