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hw/acpi/ich9: Add periodic and swsmi timer

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This patch implements the periodic and the swsmi ICH9 chipset timers. They are
especially useful when prototyping UEFI firmware (e.g. with EDK2's OVMF)
using QEMU.

For backwards compatibility, the compat properties "x-smi-swsmi-timer",
and "x-smi-periodic-timer" are introduced.

Additionally, writes to the SMI_STS register are enabled for the
corresponding two bits using a write mask to make future work easier.

Signed-off-by: Dominic Prinz <git@dprinz.de>
Message-Id: <1d90ea69e01ab71a0f2ced116801dc78e04f4448.1725991505.git.git@dprinz.de>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Dominic Prinz 2024-09-10 20:08:20 +02:00 • committed by Michael S. Tsirkin
parent 95b717a815
commit 6e3c2d58e9
8 changed files with 168 additions and 2 deletions
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23
hw/acpi/ich9.c
View file

@ -35,6 +35,7 @@
#include "sysemu/runstate.h"
#include "hw/acpi/acpi.h"
#include "hw/acpi/ich9_tco.h"
#include "hw/acpi/ich9_timer.h"
#include "hw/southbridge/ich9.h"
#include "hw/mem/pc-dimm.h"
@ -108,6 +109,18 @@ static void ich9_smi_writel(void *opaque, hwaddr addr, uint64_t val,
}
pm->smi_en &= ~pm->smi_en_wmask;
pm->smi_en |= (val & pm->smi_en_wmask);
if (pm->swsmi_timer_enabled) {
ich9_pm_update_swsmi_timer(pm, pm->smi_en &
ICH9_PMIO_SMI_EN_SWSMI_EN);
}
if (pm->periodic_timer_enabled) {
ich9_pm_update_periodic_timer(pm, pm->smi_en &
ICH9_PMIO_SMI_EN_PERIODIC_EN);
}
break;
case 4:
pm->smi_sts &= ~pm->smi_sts_wmask;
pm->smi_sts |= (val & pm->smi_sts_wmask);
break;
}
}
@ -286,6 +299,8 @@ static void pm_powerdown_req(Notifier *n, void *opaque)
void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm, qemu_irq sci_irq)
{
pm->smi_sts_wmask = 0;
memory_region_init(&pm->io, OBJECT(lpc_pci), "ich9-pm", ICH9_PMIO_SIZE);
memory_region_set_enabled(&pm->io, false);
memory_region_add_subregion(pci_address_space_io(lpc_pci),
@ -305,6 +320,14 @@ void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm, qemu_irq sci_irq)
"acpi-smi", 8);
memory_region_add_subregion(&pm->io, ICH9_PMIO_SMI_EN, &pm->io_smi);
if (pm->swsmi_timer_enabled) {
ich9_pm_swsmi_timer_init(pm);
}
if (pm->periodic_timer_enabled) {
ich9_pm_periodic_timer_init(pm);
}
if (pm->enable_tco) {
acpi_pm_tco_init(&pm->tco_regs, &pm->io);
}