Changeset 51725 in vbox

Timestamp:

Jun 25, 2014 11:57:41 AM (11 years ago)

Author:

vboxsync

Message:

BIOS: Enable APIC in SVR.

File:

• trunk/src/VBox/Devices/PC/BIOS/pmsetup.inc (modified) (3 diffs)

trunk/src/VBox/Devices/PC/BIOS/pmsetup.inc

@@ -15 +15 @@
 ;;
 
+SVR             equ     0FEE000F0h
 LVT_LINT0       equ     0FEE00350h
 LVT_LINT1       equ     0FEE00360h
@@ -20 +21 @@
 public          pmode_setup
 
-;; Program LINT0/LINT1 entries in the local APIC. Some Linux kernels (e.g.,
-;; RHEL4 SMP 32-bit) expect the entries to be unmasked in virtual wire mode.
-;; Also make sure APIC timer is masked.
+;; Enable the local APIC and program LINT0/LINT1 entries. Without that,
+;; virtual wire interrupts could not be delivered. Note that the APIC must
+;; be enabled first because when disabled, all LVTs are forced masked.
 
 pmode_setup     proc    near
@@ -36 +37 @@
                 and     eax, 09FFFFFFFh
                 mov     cr0, eax
+
+                mov     esi, SVR        ; Program the SVR -- enable the APIC,
+                mov     eax, 010Fh      ; set spurious interrupt vector to 15
+                mov     [esi], eax
 
                 mov     esi, LVT_LINT0  ; Program LINT0 to ExtINT and unmask