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qemu-e2k/hw/timer/hpet.c
Peter Maydell d17008bc29 hw/timer/hpet.c: Avoid signed integer overflow which results in bugs on OSX 
Signed integer overflow in C is undefined behaviour, and the compiler
is at liberty to assume it can never happen and optimize accordingly.
In particular, the subtractions in hpet_time_after() and hpet_time_after64()
were causing OSX clang to optimize the code such that it was prone to
hangs and complaints about the main loop stalling (presumably because
we were spending all our time trying to service very high frequency
HPET timer callbacks). The clang sanitizer confirms the UB:

hw/timer/hpet.c:119:26: runtime error: signed integer overflow: -2146967296 - 2147003978 cannot be represented in type 'int'

Fix this by doing the subtraction as an unsigned operation and then
converting to signed for the comparison.

Reported-by: Aaron Elkins <threcius@yahoo.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1447080991-24995-1-git-send-email-peter.maydell@linaro.org
2015-11-09 15:48:21 +00:00

798 lines
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/*
* High Precision Event Timer emulation
*
* Copyright (c) 2007 Alexander Graf
* Copyright (c) 2008 IBM Corporation
*
* Authors: Beth Kon <bkon@us.ibm.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* *****************************************************************
*
* This driver attempts to emulate an HPET device in software.
*/
#include "hw/hw.h"
#include "hw/i386/pc.h"
#include "ui/console.h"
#include "qemu/error-report.h"
#include "qemu/timer.h"
#include "hw/timer/hpet.h"
#include "hw/sysbus.h"
#include "hw/timer/mc146818rtc.h"
#include "hw/timer/i8254.h"
//#define HPET_DEBUG
#ifdef HPET_DEBUG
#define DPRINTF printf
#else
#define DPRINTF(...)
#endif
#define HPET_MSI_SUPPORT 0
#define HPET(obj) OBJECT_CHECK(HPETState, (obj), TYPE_HPET)
struct HPETState;
typedef struct HPETTimer { /* timers */
uint8_t tn; /*timer number*/
QEMUTimer *qemu_timer;
struct HPETState *state;
/* Memory-mapped, software visible timer registers */
uint64_t config; /* configuration/cap */
uint64_t cmp; /* comparator */
uint64_t fsb; /* FSB route */
/* Hidden register state */
uint64_t period; /* Last value written to comparator */
uint8_t wrap_flag; /* timer pop will indicate wrap for one-shot 32-bit
* mode. Next pop will be actual timer expiration.
*/
} HPETTimer;
typedef struct HPETState {
/*< private >*/
SysBusDevice parent_obj;
/*< public >*/
MemoryRegion iomem;
uint64_t hpet_offset;
qemu_irq irqs[HPET_NUM_IRQ_ROUTES];
uint32_t flags;
uint8_t rtc_irq_level;
qemu_irq pit_enabled;
uint8_t num_timers;
uint32_t intcap;
HPETTimer timer[HPET_MAX_TIMERS];
/* Memory-mapped, software visible registers */
uint64_t capability; /* capabilities */
uint64_t config; /* configuration */
uint64_t isr; /* interrupt status reg */
uint64_t hpet_counter; /* main counter */
uint8_t hpet_id; /* instance id */
} HPETState;
static uint32_t hpet_in_legacy_mode(HPETState *s)
{
return s->config & HPET_CFG_LEGACY;
}
static uint32_t timer_int_route(struct HPETTimer *timer)
{
return (timer->config & HPET_TN_INT_ROUTE_MASK) >> HPET_TN_INT_ROUTE_SHIFT;
}
static uint32_t timer_fsb_route(HPETTimer *t)
{
return t->config & HPET_TN_FSB_ENABLE;
}
static uint32_t hpet_enabled(HPETState *s)
{
return s->config & HPET_CFG_ENABLE;
}
static uint32_t timer_is_periodic(HPETTimer *t)
{
return t->config & HPET_TN_PERIODIC;
}
static uint32_t timer_enabled(HPETTimer *t)
{
return t->config & HPET_TN_ENABLE;
}
static uint32_t hpet_time_after(uint64_t a, uint64_t b)
{
return ((int32_t)(b - a) < 0);
}
static uint32_t hpet_time_after64(uint64_t a, uint64_t b)
{
return ((int64_t)(b - a) < 0);
}
static uint64_t ticks_to_ns(uint64_t value)
{
return value * HPET_CLK_PERIOD;
}
static uint64_t ns_to_ticks(uint64_t value)
{
return value / HPET_CLK_PERIOD;
}
static uint64_t hpet_fixup_reg(uint64_t new, uint64_t old, uint64_t mask)
{
new &= mask;
new |= old & ~mask;
return new;
}
static int activating_bit(uint64_t old, uint64_t new, uint64_t mask)
{
return (!(old & mask) && (new & mask));
}
static int deactivating_bit(uint64_t old, uint64_t new, uint64_t mask)
{
return ((old & mask) && !(new & mask));
}
static uint64_t hpet_get_ticks(HPETState *s)
{
return ns_to_ticks(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->hpet_offset);
}
/*
* calculate diff between comparator value and current ticks
*/
static inline uint64_t hpet_calculate_diff(HPETTimer *t, uint64_t current)
{
if (t->config & HPET_TN_32BIT) {
uint32_t diff, cmp;
cmp = (uint32_t)t->cmp;
diff = cmp - (uint32_t)current;
diff = (int32_t)diff > 0 ? diff : (uint32_t)1;
return (uint64_t)diff;
} else {
uint64_t diff, cmp;
cmp = t->cmp;
diff = cmp - current;
diff = (int64_t)diff > 0 ? diff : (uint64_t)1;
return diff;
}
}
static void update_irq(struct HPETTimer *timer, int set)
{
uint64_t mask;
HPETState *s;
int route;
if (timer->tn <= 1 && hpet_in_legacy_mode(timer->state)) {
/* if LegacyReplacementRoute bit is set, HPET specification requires
* timer0 be routed to IRQ0 in NON-APIC or IRQ2 in the I/O APIC,
* timer1 be routed to IRQ8 in NON-APIC or IRQ8 in the I/O APIC.
*/
route = (timer->tn == 0) ? 0 : RTC_ISA_IRQ;
} else {
route = timer_int_route(timer);
}
s = timer->state;
mask = 1 << timer->tn;
if (!set || !timer_enabled(timer) || !hpet_enabled(timer->state)) {
s->isr &= ~mask;
if (!timer_fsb_route(timer)) {
/* fold the ICH PIRQ# pin's internal inversion logic into hpet */
if (route >= ISA_NUM_IRQS) {
qemu_irq_raise(s->irqs[route]);
} else {
qemu_irq_lower(s->irqs[route]);
}
}
} else if (timer_fsb_route(timer)) {
address_space_stl_le(&address_space_memory, timer->fsb >> 32,
timer->fsb & 0xffffffff, MEMTXATTRS_UNSPECIFIED,
NULL);
} else if (timer->config & HPET_TN_TYPE_LEVEL) {
s->isr |= mask;
/* fold the ICH PIRQ# pin's internal inversion logic into hpet */
if (route >= ISA_NUM_IRQS) {
qemu_irq_lower(s->irqs[route]);
} else {
qemu_irq_raise(s->irqs[route]);
}
} else {
s->isr &= ~mask;
qemu_irq_pulse(s->irqs[route]);
}
}
static void hpet_pre_save(void *opaque)
{
HPETState *s = opaque;
/* save current counter value */
s->hpet_counter = hpet_get_ticks(s);
}
static int hpet_pre_load(void *opaque)
{
HPETState *s = opaque;
/* version 1 only supports 3, later versions will load the actual value */
s->num_timers = HPET_MIN_TIMERS;
return 0;
}
static bool hpet_validate_num_timers(void *opaque, int version_id)
{
HPETState *s = opaque;
if (s->num_timers < HPET_MIN_TIMERS) {
return false;
} else if (s->num_timers > HPET_MAX_TIMERS) {
return false;
}
return true;
}
static int hpet_post_load(void *opaque, int version_id)
{
HPETState *s = opaque;
/* Recalculate the offset between the main counter and guest time */
s->hpet_offset = ticks_to_ns(s->hpet_counter) - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
/* Push number of timers into capability returned via HPET_ID */
s->capability &= ~HPET_ID_NUM_TIM_MASK;
s->capability |= (s->num_timers - 1) << HPET_ID_NUM_TIM_SHIFT;
hpet_cfg.hpet[s->hpet_id].event_timer_block_id = (uint32_t)s->capability;
/* Derive HPET_MSI_SUPPORT from the capability of the first timer. */
s->flags &= ~(1 << HPET_MSI_SUPPORT);
if (s->timer[0].config & HPET_TN_FSB_CAP) {
s->flags |= 1 << HPET_MSI_SUPPORT;
}
return 0;
}
static bool hpet_rtc_irq_level_needed(void *opaque)
{
HPETState *s = opaque;
return s->rtc_irq_level != 0;
}
static const VMStateDescription vmstate_hpet_rtc_irq_level = {
.name = "hpet/rtc_irq_level",
.version_id = 1,
.minimum_version_id = 1,
.needed = hpet_rtc_irq_level_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT8(rtc_irq_level, HPETState),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_hpet_timer = {
.name = "hpet_timer",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT8(tn, HPETTimer),
VMSTATE_UINT64(config, HPETTimer),
VMSTATE_UINT64(cmp, HPETTimer),
VMSTATE_UINT64(fsb, HPETTimer),
VMSTATE_UINT64(period, HPETTimer),
VMSTATE_UINT8(wrap_flag, HPETTimer),
VMSTATE_TIMER_PTR(qemu_timer, HPETTimer),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_hpet = {
.name = "hpet",
.version_id = 2,
.minimum_version_id = 1,
.pre_save = hpet_pre_save,
.pre_load = hpet_pre_load,
.post_load = hpet_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT64(config, HPETState),
VMSTATE_UINT64(isr, HPETState),
VMSTATE_UINT64(hpet_counter, HPETState),
VMSTATE_UINT8_V(num_timers, HPETState, 2),
VMSTATE_VALIDATE("num_timers in range", hpet_validate_num_timers),
VMSTATE_STRUCT_VARRAY_UINT8(timer, HPETState, num_timers, 0,
vmstate_hpet_timer, HPETTimer),
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription*[]) {
&vmstate_hpet_rtc_irq_level,
NULL
}
};
/*
* timer expiration callback
*/
static void hpet_timer(void *opaque)
{
HPETTimer *t = opaque;
uint64_t diff;
uint64_t period = t->period;
uint64_t cur_tick = hpet_get_ticks(t->state);
if (timer_is_periodic(t) && period != 0) {
if (t->config & HPET_TN_32BIT) {
while (hpet_time_after(cur_tick, t->cmp)) {
t->cmp = (uint32_t)(t->cmp + t->period);
}
} else {
while (hpet_time_after64(cur_tick, t->cmp)) {
t->cmp += period;
}
}
diff = hpet_calculate_diff(t, cur_tick);
timer_mod(t->qemu_timer,
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + (int64_t)ticks_to_ns(diff));
} else if (t->config & HPET_TN_32BIT && !timer_is_periodic(t)) {
if (t->wrap_flag) {
diff = hpet_calculate_diff(t, cur_tick);
timer_mod(t->qemu_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
(int64_t)ticks_to_ns(diff));
t->wrap_flag = 0;
}
}
update_irq(t, 1);
}
static void hpet_set_timer(HPETTimer *t)
{
uint64_t diff;
uint32_t wrap_diff; /* how many ticks until we wrap? */
uint64_t cur_tick = hpet_get_ticks(t->state);
/* whenever new timer is being set up, make sure wrap_flag is 0 */
t->wrap_flag = 0;
diff = hpet_calculate_diff(t, cur_tick);
/* hpet spec says in one-shot 32-bit mode, generate an interrupt when
* counter wraps in addition to an interrupt with comparator match.
*/
if (t->config & HPET_TN_32BIT && !timer_is_periodic(t)) {
wrap_diff = 0xffffffff - (uint32_t)cur_tick;
if (wrap_diff < (uint32_t)diff) {
diff = wrap_diff;
t->wrap_flag = 1;
}
}
timer_mod(t->qemu_timer,
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + (int64_t)ticks_to_ns(diff));
}
static void hpet_del_timer(HPETTimer *t)
{
timer_del(t->qemu_timer);
update_irq(t, 0);
}
#ifdef HPET_DEBUG
static uint32_t hpet_ram_readb(void *opaque, hwaddr addr)
{
printf("qemu: hpet_read b at %" PRIx64 "\n", addr);
return 0;
}
static uint32_t hpet_ram_readw(void *opaque, hwaddr addr)
{
printf("qemu: hpet_read w at %" PRIx64 "\n", addr);
return 0;
}
#endif
static uint64_t hpet_ram_read(void *opaque, hwaddr addr,
unsigned size)
{
HPETState *s = opaque;
uint64_t cur_tick, index;
DPRINTF("qemu: Enter hpet_ram_readl at %" PRIx64 "\n", addr);
index = addr;
/*address range of all TN regs*/
if (index >= 0x100 && index <= 0x3ff) {
uint8_t timer_id = (addr - 0x100) / 0x20;
HPETTimer *timer = &s->timer[timer_id];
if (timer_id > s->num_timers) {
DPRINTF("qemu: timer id out of range\n");
return 0;
}
switch ((addr - 0x100) % 0x20) {
case HPET_TN_CFG:
return timer->config;
case HPET_TN_CFG + 4: // Interrupt capabilities
return timer->config >> 32;
case HPET_TN_CMP: // comparator register
return timer->cmp;
case HPET_TN_CMP + 4:
return timer->cmp >> 32;
case HPET_TN_ROUTE:
return timer->fsb;
case HPET_TN_ROUTE + 4:
return timer->fsb >> 32;
default:
DPRINTF("qemu: invalid hpet_ram_readl\n");
break;
}
} else {
switch (index) {
case HPET_ID:
return s->capability;
case HPET_PERIOD:
return s->capability >> 32;
case HPET_CFG:
return s->config;
case HPET_CFG + 4:
DPRINTF("qemu: invalid HPET_CFG + 4 hpet_ram_readl\n");
return 0;
case HPET_COUNTER:
if (hpet_enabled(s)) {
cur_tick = hpet_get_ticks(s);
} else {
cur_tick = s->hpet_counter;
}
DPRINTF("qemu: reading counter = %" PRIx64 "\n", cur_tick);
return cur_tick;
case HPET_COUNTER + 4:
if (hpet_enabled(s)) {
cur_tick = hpet_get_ticks(s);
} else {
cur_tick = s->hpet_counter;
}
DPRINTF("qemu: reading counter + 4 = %" PRIx64 "\n", cur_tick);
return cur_tick >> 32;
case HPET_STATUS:
return s->isr;
default:
DPRINTF("qemu: invalid hpet_ram_readl\n");
break;
}
}
return 0;
}
static void hpet_ram_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
int i;
HPETState *s = opaque;
uint64_t old_val, new_val, val, index;
DPRINTF("qemu: Enter hpet_ram_writel at %" PRIx64 " = %#x\n", addr, value);
index = addr;
old_val = hpet_ram_read(opaque, addr, 4);
new_val = value;
/*address range of all TN regs*/
if (index >= 0x100 && index <= 0x3ff) {
uint8_t timer_id = (addr - 0x100) / 0x20;
HPETTimer *timer = &s->timer[timer_id];
DPRINTF("qemu: hpet_ram_writel timer_id = %#x\n", timer_id);
if (timer_id > s->num_timers) {
DPRINTF("qemu: timer id out of range\n");
return;
}
switch ((addr - 0x100) % 0x20) {
case HPET_TN_CFG:
DPRINTF("qemu: hpet_ram_writel HPET_TN_CFG\n");
if (activating_bit(old_val, new_val, HPET_TN_FSB_ENABLE)) {
update_irq(timer, 0);
}
val = hpet_fixup_reg(new_val, old_val, HPET_TN_CFG_WRITE_MASK);
timer->config = (timer->config & 0xffffffff00000000ULL) | val;
if (new_val & HPET_TN_32BIT) {
timer->cmp = (uint32_t)timer->cmp;
timer->period = (uint32_t)timer->period;
}
if (activating_bit(old_val, new_val, HPET_TN_ENABLE) &&
hpet_enabled(s)) {
hpet_set_timer(timer);
} else if (deactivating_bit(old_val, new_val, HPET_TN_ENABLE)) {
hpet_del_timer(timer);
}
break;
case HPET_TN_CFG + 4: // Interrupt capabilities
DPRINTF("qemu: invalid HPET_TN_CFG+4 write\n");
break;
case HPET_TN_CMP: // comparator register
DPRINTF("qemu: hpet_ram_writel HPET_TN_CMP\n");
if (timer->config & HPET_TN_32BIT) {
new_val = (uint32_t)new_val;
}
if (!timer_is_periodic(timer)
|| (timer->config & HPET_TN_SETVAL)) {
timer->cmp = (timer->cmp & 0xffffffff00000000ULL) | new_val;
}
if (timer_is_periodic(timer)) {
/*
* FIXME: Clamp period to reasonable min value?
* Clamp period to reasonable max value
*/
new_val &= (timer->config & HPET_TN_32BIT ? ~0u : ~0ull) >> 1;
timer->period =
(timer->period & 0xffffffff00000000ULL) | new_val;
}
timer->config &= ~HPET_TN_SETVAL;
if (hpet_enabled(s)) {
hpet_set_timer(timer);
}
break;
case HPET_TN_CMP + 4: // comparator register high order
DPRINTF("qemu: hpet_ram_writel HPET_TN_CMP + 4\n");
if (!timer_is_periodic(timer)
|| (timer->config & HPET_TN_SETVAL)) {
timer->cmp = (timer->cmp & 0xffffffffULL) | new_val << 32;
} else {
/*
* FIXME: Clamp period to reasonable min value?
* Clamp period to reasonable max value
*/
new_val &= (timer->config & HPET_TN_32BIT ? ~0u : ~0ull) >> 1;
timer->period =
(timer->period & 0xffffffffULL) | new_val << 32;
}
timer->config &= ~HPET_TN_SETVAL;
if (hpet_enabled(s)) {
hpet_set_timer(timer);
}
break;
case HPET_TN_ROUTE:
timer->fsb = (timer->fsb & 0xffffffff00000000ULL) | new_val;
break;
case HPET_TN_ROUTE + 4:
timer->fsb = (new_val << 32) | (timer->fsb & 0xffffffff);
break;
default:
DPRINTF("qemu: invalid hpet_ram_writel\n");
break;
}
return;
} else {
switch (index) {
case HPET_ID:
return;
case HPET_CFG:
val = hpet_fixup_reg(new_val, old_val, HPET_CFG_WRITE_MASK);
s->config = (s->config & 0xffffffff00000000ULL) | val;
if (activating_bit(old_val, new_val, HPET_CFG_ENABLE)) {
/* Enable main counter and interrupt generation. */
s->hpet_offset =
ticks_to_ns(s->hpet_counter) - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
for (i = 0; i < s->num_timers; i++) {
if ((&s->timer[i])->cmp != ~0ULL) {
hpet_set_timer(&s->timer[i]);
}
}
} else if (deactivating_bit(old_val, new_val, HPET_CFG_ENABLE)) {
/* Halt main counter and disable interrupt generation. */
s->hpet_counter = hpet_get_ticks(s);
for (i = 0; i < s->num_timers; i++) {
hpet_del_timer(&s->timer[i]);
}
}
/* i8254 and RTC output pins are disabled
* when HPET is in legacy mode */
if (activating_bit(old_val, new_val, HPET_CFG_LEGACY)) {
qemu_set_irq(s->pit_enabled, 0);
qemu_irq_lower(s->irqs[0]);
qemu_irq_lower(s->irqs[RTC_ISA_IRQ]);
} else if (deactivating_bit(old_val, new_val, HPET_CFG_LEGACY)) {
qemu_irq_lower(s->irqs[0]);
qemu_set_irq(s->pit_enabled, 1);
qemu_set_irq(s->irqs[RTC_ISA_IRQ], s->rtc_irq_level);
}
break;
case HPET_CFG + 4:
DPRINTF("qemu: invalid HPET_CFG+4 write\n");
break;
case HPET_STATUS:
val = new_val & s->isr;
for (i = 0; i < s->num_timers; i++) {
if (val & (1 << i)) {
update_irq(&s->timer[i], 0);
}
}
break;
case HPET_COUNTER:
if (hpet_enabled(s)) {
DPRINTF("qemu: Writing counter while HPET enabled!\n");
}
s->hpet_counter =
(s->hpet_counter & 0xffffffff00000000ULL) | value;
DPRINTF("qemu: HPET counter written. ctr = %#x -> %" PRIx64 "\n",
value, s->hpet_counter);
break;
case HPET_COUNTER + 4:
if (hpet_enabled(s)) {
DPRINTF("qemu: Writing counter while HPET enabled!\n");
}
s->hpet_counter =
(s->hpet_counter & 0xffffffffULL) | (((uint64_t)value) << 32);
DPRINTF("qemu: HPET counter + 4 written. ctr = %#x -> %" PRIx64 "\n",
value, s->hpet_counter);
break;
default:
DPRINTF("qemu: invalid hpet_ram_writel\n");
break;
}
}
}
static const MemoryRegionOps hpet_ram_ops = {
.read = hpet_ram_read,
.write = hpet_ram_write,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void hpet_reset(DeviceState *d)
{
HPETState *s = HPET(d);
SysBusDevice *sbd = SYS_BUS_DEVICE(d);
int i;
for (i = 0; i < s->num_timers; i++) {
HPETTimer *timer = &s->timer[i];
hpet_del_timer(timer);
timer->cmp = ~0ULL;
timer->config = HPET_TN_PERIODIC_CAP | HPET_TN_SIZE_CAP;
if (s->flags & (1 << HPET_MSI_SUPPORT)) {
timer->config |= HPET_TN_FSB_CAP;
}
/* advertise availability of ioapic int */
timer->config |= (uint64_t)s->intcap << 32;
timer->period = 0ULL;
timer->wrap_flag = 0;
}
qemu_set_irq(s->pit_enabled, 1);
s->hpet_counter = 0ULL;
s->hpet_offset = 0ULL;
s->config = 0ULL;
hpet_cfg.hpet[s->hpet_id].event_timer_block_id = (uint32_t)s->capability;
hpet_cfg.hpet[s->hpet_id].address = sbd->mmio[0].addr;
/* to document that the RTC lowers its output on reset as well */
s->rtc_irq_level = 0;
}
static void hpet_handle_legacy_irq(void *opaque, int n, int level)
{
HPETState *s = HPET(opaque);
if (n == HPET_LEGACY_PIT_INT) {
if (!hpet_in_legacy_mode(s)) {
qemu_set_irq(s->irqs[0], level);
}
} else {
s->rtc_irq_level = level;
if (!hpet_in_legacy_mode(s)) {
qemu_set_irq(s->irqs[RTC_ISA_IRQ], level);
}
}
}
static void hpet_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
HPETState *s = HPET(obj);
/* HPET Area */
memory_region_init_io(&s->iomem, obj, &hpet_ram_ops, s, "hpet", 0x400);
sysbus_init_mmio(sbd, &s->iomem);
}
static void hpet_realize(DeviceState *dev, Error **errp)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
HPETState *s = HPET(dev);
int i;
HPETTimer *timer;
if (!s->intcap) {
error_printf("Hpet's intcap not initialized.\n");
}
if (hpet_cfg.count == UINT8_MAX) {
/* first instance */
hpet_cfg.count = 0;
}
if (hpet_cfg.count == 8) {
error_setg(errp, "Only 8 instances of HPET is allowed");
return;
}
s->hpet_id = hpet_cfg.count++;
for (i = 0; i < HPET_NUM_IRQ_ROUTES; i++) {
sysbus_init_irq(sbd, &s->irqs[i]);
}
if (s->num_timers < HPET_MIN_TIMERS) {
s->num_timers = HPET_MIN_TIMERS;
} else if (s->num_timers > HPET_MAX_TIMERS) {
s->num_timers = HPET_MAX_TIMERS;
}
for (i = 0; i < HPET_MAX_TIMERS; i++) {
timer = &s->timer[i];
timer->qemu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, hpet_timer, timer);
timer->tn = i;
timer->state = s;
}
/* 64-bit main counter; LegacyReplacementRoute. */
s->capability = 0x8086a001ULL;
s->capability |= (s->num_timers - 1) << HPET_ID_NUM_TIM_SHIFT;
s->capability |= ((uint64_t)(HPET_CLK_PERIOD * FS_PER_NS) << 32);
qdev_init_gpio_in(dev, hpet_handle_legacy_irq, 2);
qdev_init_gpio_out(dev, &s->pit_enabled, 1);
}
static Property hpet_device_properties[] = {
DEFINE_PROP_UINT8("timers", HPETState, num_timers, HPET_MIN_TIMERS),
DEFINE_PROP_BIT("msi", HPETState, flags, HPET_MSI_SUPPORT, false),
DEFINE_PROP_UINT32(HPET_INTCAP, HPETState, intcap, 0),
DEFINE_PROP_END_OF_LIST(),
};
static void hpet_device_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = hpet_realize;
dc->reset = hpet_reset;
dc->vmsd = &vmstate_hpet;
dc->props = hpet_device_properties;
}
static const TypeInfo hpet_device_info = {
.name = TYPE_HPET,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(HPETState),
.instance_init = hpet_init,
.class_init = hpet_device_class_init,
};
static void hpet_register_types(void)
{
type_register_static(&hpet_device_info);
}
type_init(hpet_register_types)
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