This patch implements the periodic and the swsmi ICH9 chipset timer. They are
especially useful when prototyping UEFI firmware (e.g. with EDK2's OVMF)
with QEMU.
This includes that writes to the SMI_STS register are enabled for the
corresponding two bits.
Signed-off-by: Dominic Prinz <g...@dprinz.de>
---
hw/acpi/ich9.c | 15 +++++++
hw/acpi/ich9_timer.c | 79 +++++++++++++++++++++++++++++++++++
hw/acpi/meson.build | 2 +-
hw/isa/lpc_ich9.c | 6 +++
include/hw/acpi/ich9.h | 3 ++
include/hw/acpi/ich9_timer.h | 23 ++++++++++
include/hw/southbridge/ich9.h | 4 ++
7 files changed, 131 insertions(+), 1 deletion(-)
create mode 100644 hw/acpi/ich9_timer.c
create mode 100644 include/hw/acpi/ich9_timer.h
diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
index 02d8546bd3..97d645b750 100644
--- a/hw/acpi/ich9.c
+++ b/hw/acpi/ich9.c
@@ -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 +109,16 @@ 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);
+ ich9_pm_update_swsmi_timer(pm, pm->smi_en &
+ ICH9_PMIO_SMI_EN_SWSMI_EN);
+ ich9_pm_update_periodic_timer(pm, pm->smi_en &
+ ICH9_PMIO_SMI_EN_PERIODIC_EN);
+ break;
+ case 4:
+ pm->smi_sts &= ~(ICH9_PMIO_SMI_STS_SWSMI_STS |
+ ICH9_PMIO_SMI_STS_PERIODIC_STS);
+ pm->smi_sts |= val & (ICH9_PMIO_SMI_STS_SWSMI_STS |
+ ICH9_PMIO_SMI_STS_PERIODIC_STS);
break;
}
}
@@ -305,6 +316,10 @@ 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);
+ pm->swsmi_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, ich9_swsmi_timer, pm);
+
+ pm->periodic_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, ich9_periodic_timer,
pm);
+
if (pm->enable_tco) {
acpi_pm_tco_init(&pm->tco_regs, &pm->io);
}
diff --git a/hw/acpi/ich9_timer.c b/hw/acpi/ich9_timer.c
new file mode 100644
index 0000000000..2e6b68f0fb
--- /dev/null
+++ b/hw/acpi/ich9_timer.c
@@ -0,0 +1,79 @@
+/*
+ * QEMU ICH9 Timer emulation
+ *
+ * Copyright (c) 2024 Dominic Prinz <g...@dprinz.de>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/core/cpu.h"
+#include "hw/pci/pci.h"
+#include "hw/southbridge/ich9.h"
+#include "qemu/timer.h"
+
+#include "hw/acpi/ich9_timer.h"
+
+void ich9_pm_update_swsmi_timer(ICH9LPCPMRegs *pm, bool enable)
+{
+ uint16_t swsmi_rate_sel;
+ int64_t expire_time;
+ ICH9LPCState *lpc;
+
+ if (enable) {
+ lpc = container_of(pm, ICH9LPCState, pm);
+ swsmi_rate_sel =
+ (pci_get_word(lpc->d.config + ICH9_LPC_GEN_PMCON_3) & 0xc0) >> 6;
+
+ if (swsmi_rate_sel == 0) {
+ expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 1500000LL;
+ } else {
+ expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
+ 8 * (1 << swsmi_rate_sel) * 1000000LL;
+ }
+
+ timer_mod(pm->swsmi_timer, expire_time);
+ } else {
+ timer_del(pm->swsmi_timer);
+ }
+}
+
+void ich9_swsmi_timer(void *opaque)
+{
+ ICH9LPCPMRegs *pm = opaque;
+
+ pm->smi_sts |= ICH9_PMIO_SMI_STS_SWSMI_STS;
+ ich9_generate_smi();
+
+ ich9_pm_update_swsmi_timer(pm, pm->smi_en & ICH9_PMIO_SMI_EN_SWSMI_EN);
+}
+
+void ich9_pm_update_periodic_timer(ICH9LPCPMRegs *pm, bool enable)
+{
+ uint16_t per_smi_sel;
+ int64_t expire_time;
+ ICH9LPCState *lpc;
+
+ if (enable) {
+ lpc = container_of(pm, ICH9LPCState, pm);
+ per_smi_sel = pci_get_word(lpc->d.config + ICH9_LPC_GEN_PMCON_1) & 3;
+ expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
+ 8 * (1 << (3 - per_smi_sel)) * NANOSECONDS_PER_SECOND;
+
+ timer_mod(pm->periodic_timer, expire_time);
+ } else {
+ timer_del(pm->periodic_timer);
+ }
+}
+
+void ich9_periodic_timer(void *opaque)
+{
+ ICH9LPCPMRegs *pm = opaque;
+
+ pm->smi_sts = ICH9_PMIO_SMI_STS_PERIODIC_STS;
+ ich9_generate_smi();
+
+ ich9_pm_update_periodic_timer(pm,
+ pm->smi_en & ICH9_PMIO_SMI_EN_PERIODIC_EN);
+}
diff --git a/hw/acpi/meson.build b/hw/acpi/meson.build
index fa5c07db90..7f8ccc9b7a 100644
--- a/hw/acpi/meson.build
+++ b/hw/acpi/meson.build
@@ -24,7 +24,7 @@ acpi_ss.add(when: 'CONFIG_ACPI_PCI_BRIDGE', if_true:
files('pci-bridge.c'))
acpi_ss.add(when: 'CONFIG_ACPI_PCIHP', if_true: files('pcihp.c'))
acpi_ss.add(when: 'CONFIG_ACPI_PCIHP', if_false:
files('acpi-pci-hotplug-stub.c'))
acpi_ss.add(when: 'CONFIG_ACPI_VIOT', if_true: files('viot.c'))
-acpi_ss.add(when: 'CONFIG_ACPI_ICH9', if_true: files('ich9.c', 'ich9_tco.c'))
+acpi_ss.add(when: 'CONFIG_ACPI_ICH9', if_true: files('ich9.c', 'ich9_tco.c',
'ich9_timer.c'))
acpi_ss.add(when: 'CONFIG_ACPI_ERST', if_true: files('erst.c'))
acpi_ss.add(when: 'CONFIG_IPMI', if_true: files('ipmi.c'), if_false:
files('ipmi-stub.c'))
acpi_ss.add(when: 'CONFIG_PC', if_false: files('acpi-x86-stub.c'))
diff --git a/hw/isa/lpc_ich9.c b/hw/isa/lpc_ich9.c
index bd727b2320..56daeeedbf 100644
--- a/hw/isa/lpc_ich9.c
+++ b/hw/isa/lpc_ich9.c
@@ -43,6 +43,7 @@
#include "hw/southbridge/ich9.h"
#include "hw/acpi/acpi.h"
#include "hw/acpi/ich9.h"
+#include "hw/acpi/ich9_timer.h"
#include "hw/pci/pci_bus.h"
#include "hw/qdev-properties.h"
#include "sysemu/runstate.h"
@@ -531,6 +532,11 @@ ich9_lpc_pmcon_update(ICH9LPCState *lpc)
uint16_t gen_pmcon_1 = pci_get_word(lpc->d.config + ICH9_LPC_GEN_PMCON_1);
uint16_t wmask;
+ ich9_pm_update_swsmi_timer(&lpc->pm, lpc->pm.smi_en &
+ ICH9_PMIO_SMI_EN_SWSMI_EN);
+ ich9_pm_update_periodic_timer(&lpc->pm, lpc->pm.smi_en &
+ ICH9_PMIO_SMI_EN_PERIODIC_EN);
+
if (gen_pmcon_1 & ICH9_LPC_GEN_PMCON_1_SMI_LOCK) {
wmask = pci_get_word(lpc->d.wmask + ICH9_LPC_GEN_PMCON_1);
wmask &= ~ICH9_LPC_GEN_PMCON_1_SMI_LOCK;
diff --git a/include/hw/acpi/ich9.h b/include/hw/acpi/ich9.h
index 2faf7f0cae..940a3d795f 100644
--- a/include/hw/acpi/ich9.h
+++ b/include/hw/acpi/ich9.h
@@ -68,6 +68,9 @@ typedef struct ICH9LPCPMRegs {
bool smm_compat;
bool enable_tco;
TCOIORegs tco_regs;
+
+ QEMUTimer *swsmi_timer;
+ QEMUTimer *periodic_timer;
} ICH9LPCPMRegs;
#define ACPI_PM_PROP_TCO_ENABLED "enable_tco"
diff --git a/include/hw/acpi/ich9_timer.h b/include/hw/acpi/ich9_timer.h
new file mode 100644
index 0000000000..e48f9918d8
--- /dev/null
+++ b/include/hw/acpi/ich9_timer.h
@@ -0,0 +1,23 @@
+/*
+ * QEMU ICH9 Timer emulation
+ *
+ * Copyright (c) 2024 Dominic Prinz <g...@dprinz.de>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef HW_ACPI_ICH9_TIMER_H
+#define HW_ACPI_ICH9_TIMER_H
+
+#include "hw/acpi/ich9.h"
+
+void ich9_pm_update_swsmi_timer(ICH9LPCPMRegs *pm, bool enable);
+
+void ich9_swsmi_timer(void *opaque);
+
+void ich9_pm_update_periodic_timer(ICH9LPCPMRegs *pm, bool enable);
+
+void ich9_periodic_timer(void *opaque);
+
+#endif
diff --git a/include/hw/southbridge/ich9.h b/include/hw/southbridge/ich9.h
index fd01649d04..6c60017024 100644
--- a/include/hw/southbridge/ich9.h
+++ b/include/hw/southbridge/ich9.h
@@ -196,8 +196,12 @@ struct ICH9LPCState {
#define ICH9_PMIO_GPE0_LEN 16
#define ICH9_PMIO_SMI_EN 0x30
#define ICH9_PMIO_SMI_EN_APMC_EN (1 << 5)
+#define ICH9_PMIO_SMI_EN_SWSMI_EN (1 << 6)
#define ICH9_PMIO_SMI_EN_TCO_EN (1 << 13)
+#define ICH9_PMIO_SMI_EN_PERIODIC_EN (1 << 14)
#define ICH9_PMIO_SMI_STS 0x34
+#define ICH9_PMIO_SMI_STS_SWSMI_STS (1 << 6)
+#define ICH9_PMIO_SMI_STS_PERIODIC_STS (1 << 14)
#define ICH9_PMIO_TCO_RLD 0x60
#define ICH9_PMIO_TCO_LEN 32
--
2.34.1
