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qemu/hw/hpet.c
Glauber Costa c169998802 v3: don't call reset functions on cpu initialization 
There is absolutely no need to call reset functions when initializing
devices. Since we are already registering them, calling qemu_system_reset()
should suffice. Actually, it is what happens when we reboot the machine,
and using the same process instead of a special case semantics will even
allow us to find bugs easier.

Furthermore, the fact that we initialize things like the cpu quite early,
leads to the need to introduce synchronization stuff like qemu_system_cond.
This patch removes it entirely. All we need to do is call qemu_system_reset()
only when we're already sure the system is up and running

I tested it with qemu (with and without io-thread) and qemu-kvm, and it
seems to be doing okay - although qemu-kvm uses a slightly different patch.

[ v2: user mode still needs cpu_reset, so put it in ifdef. ]
[ v3: leave qemu_system_cond for now. ]

Signed-off-by: Glauber Costa <glommer@redhat.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2009-11-07 08:06:58 +00:00

587 lines
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/*
* High Precisition 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.h"
#include "pc.h"
#include "console.h"
#include "qemu-timer.h"
#include "hpet_emul.h"
//#define HPET_DEBUG
#ifdef HPET_DEBUG
#define dprintf printf
#else
#define dprintf(...)
#endif
static HPETState *hpet_statep;
uint32_t hpet_in_legacy_mode(void)
{
if (hpet_statep)
return hpet_statep->config & HPET_CFG_LEGACY;
else
return 0;
}
static uint32_t timer_int_route(struct HPETTimer *timer)
{
uint32_t route;
route = (timer->config & HPET_TN_INT_ROUTE_MASK) >> HPET_TN_INT_ROUTE_SHIFT;
return route;
}
static uint32_t hpet_enabled(void)
{
return hpet_statep->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) - (int32_t)(a) < 0);
}
static uint32_t hpet_time_after64(uint64_t a, uint64_t b)
{
return ((int64_t)(b) - (int64_t)(a) < 0);
}
static uint64_t ticks_to_ns(uint64_t value)
{
return (muldiv64(value, HPET_CLK_PERIOD, FS_PER_NS));
}
static uint64_t ns_to_ticks(uint64_t value)
{
return (muldiv64(value, FS_PER_NS, 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(void)
{
uint64_t ticks;
ticks = ns_to_ticks(qemu_get_clock(vm_clock) + hpet_statep->hpet_offset);
return ticks;
}
/*
* 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)0;
return (uint64_t)diff;
} else {
uint64_t diff, cmp;
cmp = t->cmp;
diff = cmp - current;
diff = (int64_t)diff > 0 ? diff : (uint64_t)0;
return diff;
}
}
static void update_irq(struct HPETTimer *timer)
{
qemu_irq irq;
int route;
if (timer->tn <= 1 && hpet_in_legacy_mode()) {
/* 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.
*/
if (timer->tn == 0) {
irq=timer->state->irqs[0];
} else
irq=timer->state->irqs[8];
} else {
route=timer_int_route(timer);
irq=timer->state->irqs[route];
}
if (timer_enabled(timer) && hpet_enabled()) {
qemu_irq_pulse(irq);
}
}
static void hpet_pre_save(void *opaque)
{
HPETState *s = opaque;
/* save current counter value */
s->hpet_counter = hpet_get_ticks();
}
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_get_clock(vm_clock);
return 0;
}
static const VMStateDescription vmstate_hpet_timer = {
.name = "hpet_timer",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 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(qemu_timer, HPETTimer),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_hpet = {
.name = "hpet",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.pre_save = hpet_pre_save,
.post_load = hpet_post_load,
.fields = (VMStateField []) {
VMSTATE_UINT64(config, HPETState),
VMSTATE_UINT64(isr, HPETState),
VMSTATE_UINT64(hpet_counter, HPETState),
VMSTATE_STRUCT_ARRAY(timer, HPETState, HPET_NUM_TIMERS, 0,
vmstate_hpet_timer, HPETTimer),
VMSTATE_END_OF_LIST()
}
};
/*
* timer expiration callback
*/
static void hpet_timer(void *opaque)
{
HPETTimer *t = (HPETTimer*)opaque;
uint64_t diff;
uint64_t period = t->period;
uint64_t cur_tick = hpet_get_ticks();
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);
qemu_mod_timer(t->qemu_timer, qemu_get_clock(vm_clock)
+ (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);
qemu_mod_timer(t->qemu_timer, qemu_get_clock(vm_clock)
+ (int64_t)ticks_to_ns(diff));
t->wrap_flag = 0;
}
}
update_irq(t);
}
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();
/* 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;
}
}
qemu_mod_timer(t->qemu_timer, qemu_get_clock(vm_clock)
+ (int64_t)ticks_to_ns(diff));
}
static void hpet_del_timer(HPETTimer *t)
{
qemu_del_timer(t->qemu_timer);
}
#ifdef HPET_DEBUG
static uint32_t hpet_ram_readb(void *opaque, target_phys_addr_t addr)
{
printf("qemu: hpet_read b at %" PRIx64 "\n", addr);
return 0;
}
static uint32_t hpet_ram_readw(void *opaque, target_phys_addr_t addr)
{
printf("qemu: hpet_read w at %" PRIx64 "\n", addr);
return 0;
}
#endif
static uint32_t hpet_ram_readl(void *opaque, target_phys_addr_t addr)
{
HPETState *s = (HPETState *)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;
if (timer_id > HPET_NUM_TIMERS - 1) {
printf("qemu: timer id out of range\n");
return 0;
}
HPETTimer *timer = &s->timer[timer_id];
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 >> 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())
cur_tick = hpet_get_ticks();
else
cur_tick = s->hpet_counter;
dprintf("qemu: reading counter = %" PRIx64 "\n", cur_tick);
return cur_tick;
case HPET_COUNTER + 4:
if (hpet_enabled())
cur_tick = hpet_get_ticks();
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;
}
#ifdef HPET_DEBUG
static void hpet_ram_writeb(void *opaque, target_phys_addr_t addr,
uint32_t value)
{
printf("qemu: invalid hpet_write b at %" PRIx64 " = %#x\n",
addr, value);
}
static void hpet_ram_writew(void *opaque, target_phys_addr_t addr,
uint32_t value)
{
printf("qemu: invalid hpet_write w at %" PRIx64 " = %#x\n",
addr, value);
}
#endif
static void hpet_ram_writel(void *opaque, target_phys_addr_t addr,
uint32_t value)
{
int i;
HPETState *s = (HPETState *)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_readl(opaque, addr);
new_val = value;
/*address range of all TN regs*/
if (index >= 0x100 && index <= 0x3ff) {
uint8_t timer_id = (addr - 0x100) / 0x20;
dprintf("qemu: hpet_ram_writel timer_id = %#x \n", timer_id);
HPETTimer *timer = &s->timer[timer_id];
switch ((addr - 0x100) % 0x20) {
case HPET_TN_CFG:
dprintf("qemu: hpet_ram_writel HPET_TN_CFG\n");
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 (new_val & HPET_TIMER_TYPE_LEVEL) {
printf("qemu: level-triggered hpet not supported\n");
exit (-1);
}
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())
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())
hpet_set_timer(timer);
break;
case HPET_TN_ROUTE + 4:
dprintf("qemu: hpet_ram_writel HPET_TN_ROUTE + 4\n");
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_get_clock(vm_clock);
for (i = 0; i < HPET_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();
for (i = 0; i < HPET_NUM_TIMERS; i++)
hpet_del_timer(&s->timer[i]);
}
/* i8254 and RTC are disabled when HPET is in legacy mode */
if (activating_bit(old_val, new_val, HPET_CFG_LEGACY)) {
hpet_pit_disable();
} else if (deactivating_bit(old_val, new_val, HPET_CFG_LEGACY)) {
hpet_pit_enable();
}
break;
case HPET_CFG + 4:
dprintf("qemu: invalid HPET_CFG+4 write \n");
break;
case HPET_STATUS:
/* FIXME: need to handle level-triggered interrupts */
break;
case HPET_COUNTER:
if (hpet_enabled())
printf("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())
printf("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 CPUReadMemoryFunc * const hpet_ram_read[] = {
#ifdef HPET_DEBUG
hpet_ram_readb,
hpet_ram_readw,
#else
NULL,
NULL,
#endif
hpet_ram_readl,
};
static CPUWriteMemoryFunc * const hpet_ram_write[] = {
#ifdef HPET_DEBUG
hpet_ram_writeb,
hpet_ram_writew,
#else
NULL,
NULL,
#endif
hpet_ram_writel,
};
static void hpet_reset(void *opaque) {
HPETState *s = opaque;
int i;
static int count = 0;
for (i=0; i<HPET_NUM_TIMERS; i++) {
HPETTimer *timer = &s->timer[i];
hpet_del_timer(timer);
timer->tn = i;
timer->cmp = ~0ULL;
timer->config = HPET_TN_PERIODIC_CAP | HPET_TN_SIZE_CAP;
/* advertise availability of ioapic inti2 */
timer->config |= 0x00000004ULL << 32;
timer->state = s;
timer->period = 0ULL;
timer->wrap_flag = 0;
}
s->hpet_counter = 0ULL;
s->hpet_offset = 0ULL;
/* 64-bit main counter; 3 timers supported; LegacyReplacementRoute. */
s->capability = 0x8086a201ULL;
s->capability |= ((HPET_CLK_PERIOD) << 32);
s->config = 0ULL;
if (count > 0)
/* we don't enable pit when hpet_reset is first called (by hpet_init)
* because hpet is taking over for pit here. On subsequent invocations,
* hpet_reset is called due to system reset. At this point control must
* be returned to pit until SW reenables hpet.
*/
hpet_pit_enable();
count = 1;
}
void hpet_init(qemu_irq *irq) {
int i, iomemtype;
HPETState *s;
dprintf ("hpet_init\n");
s = qemu_mallocz(sizeof(HPETState));
hpet_statep = s;
s->irqs = irq;
for (i=0; i<HPET_NUM_TIMERS; i++) {
HPETTimer *timer = &s->timer[i];
timer->qemu_timer = qemu_new_timer(vm_clock, hpet_timer, timer);
}
vmstate_register(-1, &vmstate_hpet, s);
qemu_register_reset(hpet_reset, s);
/* HPET Area */
iomemtype = cpu_register_io_memory(hpet_ram_read,
hpet_ram_write, s);
cpu_register_physical_memory(HPET_BASE, 0x400, iomemtype);
}
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