From d11e859e4afe9b8b12f4478ab4ae3204d2d665ce Mon Sep 17 00:00:00 2001 From: Jan Kiszka Date: Fri, 2 Mar 2012 20:28:46 +0100 Subject: i8254: Factor out base class for KVM reuse Applying the concept used for the *PICs once again: establish a base class for the i8254 that can be used both by the current user space emulation and the upcoming KVM in-kernel version. We share most of the public interface of the i8254, specifically to the pcspk, vmstate, reset and certain init parts. Signed-off-by: Jan Kiszka Signed-off-by: Avi Kivity --- hw/i8254.c | 269 +++++++------------------------------------------------------ 1 file changed, 31 insertions(+), 238 deletions(-) (limited to 'hw/i8254.c') diff --git a/hw/i8254.c b/hw/i8254.c index f30396af88..9fde3449b2 100644 --- a/hw/i8254.c +++ b/hw/i8254.c @@ -26,6 +26,7 @@ #include "isa.h" #include "qemu-timer.h" #include "i8254.h" +#include "i8254_internal.h" //#define DEBUG_PIT @@ -34,34 +35,6 @@ #define RW_STATE_WORD0 3 #define RW_STATE_WORD1 4 -typedef struct PITChannelState { - int count; /* can be 65536 */ - uint16_t latched_count; - uint8_t count_latched; - uint8_t status_latched; - uint8_t status; - uint8_t read_state; - uint8_t write_state; - uint8_t write_latch; - uint8_t rw_mode; - uint8_t mode; - uint8_t bcd; /* not supported */ - uint8_t gate; /* timer start */ - int64_t count_load_time; - /* irq handling */ - int64_t next_transition_time; - QEMUTimer *irq_timer; - qemu_irq irq; - uint32_t irq_disabled; -} PITChannelState; - -typedef struct PITState { - ISADevice dev; - MemoryRegion ioports; - uint32_t iobase; - PITChannelState channels[3]; -} PITState; - static void pit_irq_timer_update(PITChannelState *s, int64_t current_time); static int pit_get_count(PITChannelState *s) @@ -89,99 +62,11 @@ static int pit_get_count(PITChannelState *s) return counter; } -/* get pit output bit */ -static int pit_get_out(PITChannelState *s, int64_t current_time) -{ - uint64_t d; - int out; - - d = muldiv64(current_time - s->count_load_time, PIT_FREQ, - get_ticks_per_sec()); - switch(s->mode) { - default: - case 0: - out = (d >= s->count); - break; - case 1: - out = (d < s->count); - break; - case 2: - if ((d % s->count) == 0 && d != 0) - out = 1; - else - out = 0; - break; - case 3: - out = (d % s->count) < ((s->count + 1) >> 1); - break; - case 4: - case 5: - out = (d == s->count); - break; - } - return out; -} - -/* return -1 if no transition will occur. */ -static int64_t pit_get_next_transition_time(PITChannelState *s, - int64_t current_time) -{ - uint64_t d, next_time, base; - int period2; - - d = muldiv64(current_time - s->count_load_time, PIT_FREQ, - get_ticks_per_sec()); - switch(s->mode) { - default: - case 0: - case 1: - if (d < s->count) - next_time = s->count; - else - return -1; - break; - case 2: - base = (d / s->count) * s->count; - if ((d - base) == 0 && d != 0) - next_time = base + s->count; - else - next_time = base + s->count + 1; - break; - case 3: - base = (d / s->count) * s->count; - period2 = ((s->count + 1) >> 1); - if ((d - base) < period2) - next_time = base + period2; - else - next_time = base + s->count; - break; - case 4: - case 5: - if (d < s->count) - next_time = s->count; - else if (d == s->count) - next_time = s->count + 1; - else - return -1; - break; - } - /* convert to timer units */ - next_time = s->count_load_time + muldiv64(next_time, get_ticks_per_sec(), - PIT_FREQ); - /* fix potential rounding problems */ - /* XXX: better solution: use a clock at PIT_FREQ Hz */ - if (next_time <= current_time) - next_time = current_time + 1; - return next_time; -} - /* val must be 0 or 1 */ -void pit_set_gate(ISADevice *dev, int channel, int val) +static void pit_set_channel_gate(PITCommonState *s, PITChannelState *sc, + int val) { - PITState *pit = DO_UPCAST(PITState, dev, dev); - PITChannelState *s = &pit->channels[channel]; - - switch(s->mode) { + switch (sc->mode) { default: case 0: case 4: @@ -189,34 +74,23 @@ void pit_set_gate(ISADevice *dev, int channel, int val) break; case 1: case 5: - if (s->gate < val) { + if (sc->gate < val) { /* restart counting on rising edge */ - s->count_load_time = qemu_get_clock_ns(vm_clock); - pit_irq_timer_update(s, s->count_load_time); + sc->count_load_time = qemu_get_clock_ns(vm_clock); + pit_irq_timer_update(sc, sc->count_load_time); } break; case 2: case 3: - if (s->gate < val) { + if (sc->gate < val) { /* restart counting on rising edge */ - s->count_load_time = qemu_get_clock_ns(vm_clock); - pit_irq_timer_update(s, s->count_load_time); + sc->count_load_time = qemu_get_clock_ns(vm_clock); + pit_irq_timer_update(sc, sc->count_load_time); } /* XXX: disable/enable counting */ break; } - s->gate = val; -} - -void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info) -{ - PITState *pit = DO_UPCAST(PITState, dev, dev); - PITChannelState *s = &pit->channels[channel]; - - info->gate = s->gate; - info->mode = s->mode; - info->initial_count = s->count; - info->out = pit_get_out(s, qemu_get_clock_ns(vm_clock)); + sc->gate = val; } static inline void pit_load_count(PITChannelState *s, int val) @@ -239,7 +113,7 @@ static void pit_latch_count(PITChannelState *s) static void pit_ioport_write(void *opaque, uint32_t addr, uint32_t val) { - PITState *pit = opaque; + PITCommonState *pit = opaque; int channel, access; PITChannelState *s; @@ -306,7 +180,7 @@ static void pit_ioport_write(void *opaque, uint32_t addr, uint32_t val) static uint32_t pit_ioport_read(void *opaque, uint32_t addr) { - PITState *pit = opaque; + PITCommonState *pit = opaque; int ret, count; PITChannelState *s; @@ -387,94 +261,16 @@ static void pit_irq_timer(void *opaque) pit_irq_timer_update(s, s->next_transition_time); } -static const VMStateDescription vmstate_pit_channel = { - .name = "pit channel", - .version_id = 2, - .minimum_version_id = 2, - .minimum_version_id_old = 2, - .fields = (VMStateField []) { - VMSTATE_INT32(count, PITChannelState), - VMSTATE_UINT16(latched_count, PITChannelState), - VMSTATE_UINT8(count_latched, PITChannelState), - VMSTATE_UINT8(status_latched, PITChannelState), - VMSTATE_UINT8(status, PITChannelState), - VMSTATE_UINT8(read_state, PITChannelState), - VMSTATE_UINT8(write_state, PITChannelState), - VMSTATE_UINT8(write_latch, PITChannelState), - VMSTATE_UINT8(rw_mode, PITChannelState), - VMSTATE_UINT8(mode, PITChannelState), - VMSTATE_UINT8(bcd, PITChannelState), - VMSTATE_UINT8(gate, PITChannelState), - VMSTATE_INT64(count_load_time, PITChannelState), - VMSTATE_INT64(next_transition_time, PITChannelState), - VMSTATE_END_OF_LIST() - } -}; - -static int pit_load_old(QEMUFile *f, void *opaque, int version_id) +static void pit_reset(DeviceState *dev) { - PITState *pit = opaque; + PITCommonState *pit = DO_UPCAST(PITCommonState, dev.qdev, dev); PITChannelState *s; - int i; - - if (version_id != 1) - return -EINVAL; - - for(i = 0; i < 3; i++) { - s = &pit->channels[i]; - s->count=qemu_get_be32(f); - qemu_get_be16s(f, &s->latched_count); - qemu_get_8s(f, &s->count_latched); - qemu_get_8s(f, &s->status_latched); - qemu_get_8s(f, &s->status); - qemu_get_8s(f, &s->read_state); - qemu_get_8s(f, &s->write_state); - qemu_get_8s(f, &s->write_latch); - qemu_get_8s(f, &s->rw_mode); - qemu_get_8s(f, &s->mode); - qemu_get_8s(f, &s->bcd); - qemu_get_8s(f, &s->gate); - s->count_load_time=qemu_get_be64(f); - s->irq_disabled = 0; - if (s->irq_timer) { - s->next_transition_time=qemu_get_be64(f); - qemu_get_timer(f, s->irq_timer); - } - } - return 0; -} -static const VMStateDescription vmstate_pit = { - .name = "i8254", - .version_id = 3, - .minimum_version_id = 2, - .minimum_version_id_old = 1, - .load_state_old = pit_load_old, - .fields = (VMStateField []) { - VMSTATE_UINT32_V(channels[0].irq_disabled, PITState, 3), - VMSTATE_STRUCT_ARRAY(channels, PITState, 3, 2, vmstate_pit_channel, PITChannelState), - VMSTATE_TIMER(channels[0].irq_timer, PITState), - VMSTATE_END_OF_LIST() - } -}; + pit_reset_common(pit); -static void pit_reset(DeviceState *dev) -{ - PITState *pit = container_of(dev, PITState, dev.qdev); - PITChannelState *s; - int i; - - for(i = 0;i < 3; i++) { - s = &pit->channels[i]; - s->mode = 3; - s->gate = (i != 2); - s->count_load_time = qemu_get_clock_ns(vm_clock); - s->count = 0x10000; - if (i == 0 && !s->irq_disabled) { - s->next_transition_time = - pit_get_next_transition_time(s, s->count_load_time); - qemu_mod_timer(s->irq_timer, s->next_transition_time); - } + s = &pit->channels[0]; + if (!s->irq_disabled) { + qemu_mod_timer(s->irq_timer, s->next_transition_time); } } @@ -482,7 +278,7 @@ static void pit_reset(DeviceState *dev) * reenable it when legacy mode is left again. */ static void pit_irq_control(void *opaque, int n, int enable) { - PITState *pit = opaque; + PITCommonState *pit = opaque; PITChannelState *s = &pit->channels[0]; if (enable) { @@ -504,46 +300,43 @@ static const MemoryRegionOps pit_ioport_ops = { .old_portio = pit_portio }; -static int pit_initfn(ISADevice *dev) +static int pit_initfn(PITCommonState *pit) { - PITState *pit = DO_UPCAST(PITState, dev, dev); PITChannelState *s; s = &pit->channels[0]; /* the timer 0 is connected to an IRQ */ s->irq_timer = qemu_new_timer_ns(vm_clock, pit_irq_timer, s); - qdev_init_gpio_out(&dev->qdev, &s->irq, 1); + qdev_init_gpio_out(&pit->dev.qdev, &s->irq, 1); memory_region_init_io(&pit->ioports, &pit_ioport_ops, pit, "pit", 4); - isa_register_ioport(dev, &pit->ioports, pit->iobase); - - qdev_init_gpio_in(&dev->qdev, pit_irq_control, 1); - qdev_set_legacy_instance_id(&dev->qdev, pit->iobase, 2); + qdev_init_gpio_in(&pit->dev.qdev, pit_irq_control, 1); return 0; } static Property pit_properties[] = { - DEFINE_PROP_HEX32("iobase", PITState, iobase, -1), + DEFINE_PROP_HEX32("iobase", PITCommonState, iobase, -1), DEFINE_PROP_END_OF_LIST(), }; static void pit_class_initfn(ObjectClass *klass, void *data) { + PITCommonClass *k = PIT_COMMON_CLASS(klass); DeviceClass *dc = DEVICE_CLASS(klass); - ISADeviceClass *ic = ISA_DEVICE_CLASS(klass); - ic->init = pit_initfn; - dc->no_user = 1; + + k->init = pit_initfn; + k->set_channel_gate = pit_set_channel_gate; + k->get_channel_info = pit_get_channel_info_common; dc->reset = pit_reset; - dc->vmsd = &vmstate_pit; dc->props = pit_properties; } static TypeInfo pit_info = { .name = "isa-pit", - .parent = TYPE_ISA_DEVICE, - .instance_size = sizeof(PITState), + .parent = TYPE_PIT_COMMON, + .instance_size = sizeof(PITCommonState), .class_init = pit_class_initfn, }; -- cgit v1.2.3