Hi Avi,
On Thu, Jan 03, 2008 at 11:17:50PM +0200, Avi Kivity wrote:
> While pci interrupts are documented as active high, the documentation for
> the piix4 pic elcr registers suggests piix4 level-triggered interrupts are
> active high. So there is some inconsistency somewhere involving qemu
> interrupt generation (which IIRC treats all interrupts as active high), the
> ioapic (qemu doesn't implement polarity), bios setup, and the acpi dsdt.
We currently specify INT10 as active high in the dsl so I added an
override entry to the madt an now the OS knows about it and things work
as expected - we this be o.k. until all the IRQ setup gets a revamp:
>From 7950892de473d42ce57e0727594190b4bfafab14 Mon Sep 17 00:00:00 2001
From: Guido Guenther <[EMAIL PROTECTED]>
Date: Fri, 4 Jan 2008 19:26:33 +0100
Subject: [PATCH] int 10 is currently active high
so add a proper interrupt override entry to the MADT so the OS knows about it.
Fixes the ACPI powerbutton and should also fix the PM timer.
diff --git a/bios/rombios32.c b/bios/rombios32.c
index 7a96ece..99f7d23 100755
--- a/bios/rombios32.c
+++ b/bios/rombios32.c
@@ -1181,6 +1181,14 @@ struct madt_io_apic
* lines start */
};
+struct madt_intsrcovr {
+ APIC_HEADER_DEF
+ uint8_t bus;
+ uint8_t source;
+ uint32_t gsi;
+ uint16_t flags;
+};
+
#include "acpi-dsdt.hex"
static inline uint16_t cpu_to_le16(uint16_t x)
@@ -1271,9 +1279,10 @@ void acpi_bios_init(void)
addr = (addr + 7) & ~7;
madt_addr = addr;
- madt_size = sizeof(*madt) +
+ madt_size = sizeof(*madt) +
sizeof(struct madt_processor_apic) * smp_cpus +
- sizeof(struct madt_io_apic);
+ sizeof(struct madt_io_apic) +
+ sizeof(struct madt_intsrcovr);
madt = (void *)(addr);
addr += madt_size;
@@ -1335,6 +1344,7 @@ void acpi_bios_init(void)
{
struct madt_processor_apic *apic;
struct madt_io_apic *io_apic;
+ struct madt_intsrcovr *intsrcovr;
memset(madt, 0, madt_size);
madt->local_apic_address = cpu_to_le32(0xfee00000);
@@ -1355,6 +1365,15 @@ void acpi_bios_init(void)
io_apic->address = cpu_to_le32(0xfec00000);
io_apic->interrupt = cpu_to_le32(0);
+ /* int 10 (SCI) is active high atm */
+ intsrcovr = (struct madt_intsrcovr*)(io_apic + 1);
+ memset(intsrcovr, 0, sizeof(*intsrcovr));
+ intsrcovr->type = APIC_XRUPT_OVERRIDE;
+ intsrcovr->length = sizeof(*intsrcovr);
+ intsrcovr->source = 10;
+ intsrcovr->gsi = 10;
+ intsrcovr->flags = 0xd;
+
acpi_build_table_header((struct acpi_table_header *)madt,
"APIC", madt_size);
}
Cheers,
-- Guido
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