Archipelago » qemu

Fix non-ACPI Timer Interrupt Routing (Beth Kon)

Replicate ACPI irq0->inti2 override in mp table for non-acpi case.

v1 -> v2 adds comment suggested by Ryan.

Signed-off-by: Beth Kon <eak@us.ibm.com>

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

diff --git a/bios/rombios32.c b/bios/rombios32.c

index 7be4216..dc7b5f3 100644

--- a/bios/rombios32.c

+++ b/bios/rombios32.c

@@ -1168,6 +1168,12 @@ static void mptable_init(void)

     /* irqs */

     for(i = 0; i < 16; i++) {

+#ifdef BX_QEMU

+        /* One entry per ioapic input. Input 2 is covered by 

+           irq0->inti2 override (i == 0). irq 2 is unused */

+        if (i == 2)

+            continue;

+#endif        

         putb(&q, 3); /* entry type = I/O interrupt */

         putb(&q, 0); /* interrupt type = vectored interrupt */

         putb(&q, 0); /* flags: po=0, el=0 */

@@ -1175,7 +1181,11 @@ static void mptable_init(void)

         putb(&q, 0); /* source bus ID = ISA */

         putb(&q, i); /* source bus IRQ */

         putb(&q, ioapic_id); /* dest I/O APIC ID */

+#ifdef BX_QEMU

+        putb(&q, i == 0 ? 2 : i); /* dest I/O APIC interrupt in */

+#else

         putb(&q, i); /* dest I/O APIC interrupt in */

+#endif        

     }

     /* patch length */

     len = q - mp_config_table;

0013_fix-non-acpi-timer-interrupt-routing.patch