[prefix] Halt system without burning CPU if we cannot access the payload

Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/arch/i386/prefix/libprefix.S b/src/arch/i386/prefix/libprefix.S
index 13da652ed97f07e977266e21cd50871cc2eb5273..aae07354ff02bb16e8c70b61b97d3fa607a714ea 100644 (file)
--- a/src/arch/i386/prefix/libprefix.S
+++ b/src/arch/i386/prefix/libprefix.S
@@ -748,7 +748,10 @@ a20_death_message:
        call    print_hex_dword
        movw    $payload_death_message, %si
        call    print_message
-2:     jmp     2b
+2:     /* Halt system */
+       cli
+       hlt
+       jmp     2b
        .section ".prefix.data", "aw", @progbits
 payload_death_message:
        .asciz  "\nPayload inaccessible - cannot continue\n"