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This provides the required user space stubs to enable the in-kernel i8254 emulation of KVM. The in-kernel model supports lost tick compensation according to the "delay" policy. This is enabled by default and can be switched off via a device property. Depending on the feature set of the host kernel (before 2.6.32), we may have to disable the HPET or lack sound output from the PC speaker. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com>
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/*
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* QEMU 8253/8254 interval timer emulation
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*
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* Copyright (c) 2003-2004 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef HW_I8254_H
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#define HW_I8254_H
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#include "hw.h"
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#include "isa.h"
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#define PIT_FREQ 1193182
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typedef struct PITChannelInfo {
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int gate;
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int mode;
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int initial_count;
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int out;
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} PITChannelInfo;
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static inline ISADevice *pit_init(ISABus *bus, int base, int isa_irq,
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qemu_irq alt_irq)
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{
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ISADevice *dev;
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dev = isa_create(bus, "isa-pit");
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qdev_prop_set_uint32(&dev->qdev, "iobase", base);
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qdev_init_nofail(&dev->qdev);
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qdev_connect_gpio_out(&dev->qdev, 0,
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isa_irq >= 0 ? isa_get_irq(dev, isa_irq) : alt_irq);
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return dev;
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}
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static inline ISADevice *kvm_pit_init(ISABus *bus, int base)
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{
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ISADevice *dev;
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dev = isa_create(bus, "kvm-pit");
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qdev_prop_set_uint32(&dev->qdev, "iobase", base);
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qdev_init_nofail(&dev->qdev);
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return dev;
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}
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void pit_set_gate(ISADevice *dev, int channel, int val);
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void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info);
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#endif /* !HW_I8254_H */
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