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94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/*
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* QEMU ICH9 Timer emulation
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*
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* Copyright (c) 2024 Dominic Prinz <git@dprinz.de>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "hw/core/cpu.h"
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#include "hw/pci/pci.h"
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#include "hw/southbridge/ich9.h"
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#include "qemu/timer.h"
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#include "hw/acpi/ich9_timer.h"
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void ich9_pm_update_swsmi_timer(ICH9LPCPMRegs *pm, bool enable)
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{
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uint16_t swsmi_rate_sel;
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int64_t expire_time;
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ICH9LPCState *lpc;
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if (enable) {
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lpc = container_of(pm, ICH9LPCState, pm);
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swsmi_rate_sel =
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(pci_get_word(lpc->d.config + ICH9_LPC_GEN_PMCON_3) & 0xc0) >> 6;
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if (swsmi_rate_sel == 0) {
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expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 1500000LL;
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} else {
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expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
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8 * (1 << swsmi_rate_sel) * 1000000LL;
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}
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timer_mod(pm->swsmi_timer, expire_time);
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} else {
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timer_del(pm->swsmi_timer);
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}
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}
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static void ich9_pm_swsmi_timer_expired(void *opaque)
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{
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ICH9LPCPMRegs *pm = opaque;
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pm->smi_sts |= ICH9_PMIO_SMI_STS_SWSMI_STS;
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ich9_generate_smi();
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ich9_pm_update_swsmi_timer(pm, pm->smi_en & ICH9_PMIO_SMI_EN_SWSMI_EN);
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}
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void ich9_pm_swsmi_timer_init(ICH9LPCPMRegs *pm)
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{
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pm->smi_sts_wmask |= ICH9_PMIO_SMI_STS_SWSMI_STS;
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pm->swsmi_timer =
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timer_new_ns(QEMU_CLOCK_VIRTUAL, ich9_pm_swsmi_timer_expired, pm);
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}
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void ich9_pm_update_periodic_timer(ICH9LPCPMRegs *pm, bool enable)
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{
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uint16_t per_smi_sel;
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int64_t expire_time;
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ICH9LPCState *lpc;
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if (enable) {
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lpc = container_of(pm, ICH9LPCState, pm);
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per_smi_sel = pci_get_word(lpc->d.config + ICH9_LPC_GEN_PMCON_1) & 3;
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expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
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8 * (1 << (3 - per_smi_sel)) * NANOSECONDS_PER_SECOND;
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timer_mod(pm->periodic_timer, expire_time);
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} else {
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timer_del(pm->periodic_timer);
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}
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}
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static void ich9_pm_periodic_timer_expired(void *opaque)
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{
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ICH9LPCPMRegs *pm = opaque;
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pm->smi_sts = ICH9_PMIO_SMI_STS_PERIODIC_STS;
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ich9_generate_smi();
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ich9_pm_update_periodic_timer(pm,
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pm->smi_en & ICH9_PMIO_SMI_EN_PERIODIC_EN);
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}
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void ich9_pm_periodic_timer_init(ICH9LPCPMRegs *pm)
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{
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pm->smi_sts_wmask |= ICH9_PMIO_SMI_STS_PERIODIC_STS;
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pm->periodic_timer =
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timer_new_ns(QEMU_CLOCK_VIRTUAL, ich9_pm_periodic_timer_expired, pm);
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}
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