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Bochs/bochs/iodev/hpet.cc

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/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// High Precision Event Timer emulation ported from Qemu
//
// Copyright (c) 2007 Alexander Graf
// Copyright (c) 2008 IBM Corporation
//
// Authors: Beth Kon <bkon@us.ibm.com>
//
// Copyright (C) 2017 The Bochs Project
//
// 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, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
/////////////////////////////////////////////////////////////////////////
// Define BX_PLUGGABLE in files that can be compiled into plugins. For
// platforms that require a special tag on exported symbols, BX_PLUGGABLE
// is used to know when we are exporting symbols and when we are importing.
#define BX_PLUGGABLE
#include "iodev.h"
#if BX_SUPPORT_PCI
#include "hpet.h"
#define LOG_THIS theHPET->
bx_hpet_c *theHPET = NULL;
// device plugin entry points
int CDECL libhpet_LTX_plugin_init(plugin_t *plugin, plugintype_t type)
{
theHPET = new bx_hpet_c();
BX_REGISTER_DEVICE_DEVMODEL(plugin, type, theHPET, BX_PLUGIN_HPET);
return(0); // Success
}
void CDECL libhpet_LTX_plugin_fini(void)
{
delete theHPET;
}
// helper functions
static Bit32u hpet_time_after(Bit64u a, Bit64u b)
{
return ((Bit32s)(b - a) < 0);
}
static Bit32u hpet_time_after64(Bit64u a, Bit64u b)
{
return ((Bit64s)(b - a) < 0);
}
static Bit64u ticks_to_ns(Bit64u value)
{
return value * HPET_CLK_PERIOD;
}
static Bit64u ns_to_ticks(Bit64u value)
{
return value / HPET_CLK_PERIOD;
}
static Bit64u hpet_fixup_reg(Bit64u _new, Bit64u old, Bit64u mask)
{
_new &= mask;
_new |= old & ~mask;
return _new;
}
static int activating_bit(Bit64u old, Bit64u _new, Bit64u mask)
{
return (!(old & mask) && (_new & mask));
}
static int deactivating_bit(Bit64u old, Bit64u _new, Bit64u mask)
{
return ((old & mask) && !(_new & mask));
}
// static memory read/write functions
static bx_bool hpet_read(bx_phy_address a20addr, unsigned len, void *data, void *param)
{
Bit32u value1;
Bit64u value2;
if (len == 4) { // must be 32-bit aligned
if ((a20addr & 0x3) != 0) {
BX_PANIC(("Unaligned HPET read at address 0x" FMT_PHY_ADDRX, a20addr));
return 1;
}
value1 = theHPET->read_aligned(a20addr);
*((Bit32u *)data) = value1;
return 1;
} else if (len == 8) { // must be 64-bit aligned
if ((a20addr & 0x7) != 0) {
BX_PANIC(("Unaligned HPET read at address 0x" FMT_PHY_ADDRX, a20addr));
return 1;
}
value1 = theHPET->read_aligned(a20addr);
value2 = theHPET->read_aligned(a20addr + 4);
*((Bit64u *)data) = (value1 | (value2 << 32));
return 1;
} else {
BX_PANIC(("Unsupported HPET read at address 0x" FMT_PHY_ADDRX, a20addr));
}
return 1;
}
static bx_bool hpet_write(bx_phy_address a20addr, unsigned len, void *data, void *param)
{
if (len == 4) { // must be 32-bit aligned
if ((a20addr & 0x3) != 0) {
BX_PANIC(("Unaligned HPET write at address 0x" FMT_PHY_ADDRX, a20addr));
return 1;
}
theHPET->write_aligned(a20addr, *((Bit32u*) data));
return 1;
} else if (len == 8) { // must be 64-bit aligned
if ((a20addr & 0x7) != 0) {
BX_PANIC(("Unaligned HPET write at address 0x" FMT_PHY_ADDRX, a20addr));
return 1;
}
Bit64u val64 = *((Bit64u*) data);
theHPET->write_aligned(a20addr, (Bit32u)val64);
theHPET->write_aligned(a20addr + 4, (Bit32u)(val64 >> 32));
} else {
BX_PANIC(("Unsupported HPET write at address 0x" FMT_PHY_ADDRX, a20addr));
}
return 1;
}
// the device object
bx_hpet_c::bx_hpet_c()
{
put("HPET");
}
bx_hpet_c::~bx_hpet_c()
{
SIM->get_bochs_root()->remove("hpet");
BX_DEBUG(("Exit"));
}
void bx_hpet_c::init(void)
{
BX_INFO(("initializing HPET"));
s.num_timers = HPET_MIN_TIMERS;
s.capability = BX_CONST64(0x8086a001) | ((s.num_timers - 1) << 8);
s.capability |= ((Bit64u)(HPET_CLK_PERIOD * FS_PER_NS) << 32);
s.isr = 0x00;
DEV_register_memory_handlers(theHPET, hpet_read, hpet_write,
HPET_BASE, HPET_BASE + HPET_LEN - 1);
for (int i = 0; i < HPET_MAX_TIMERS; i++) {
s.timer[i].tn = i;
s.timer[i].timer_id =
DEV_register_timer(this, timer_handler, 1, 0, 0, "hpet");
bx_pc_system.setTimerParam(s.timer[i].timer_id, i);
}
#if BX_DEBUGGER
// register device for the 'info device' command (calls debug_dump())
bx_dbg_register_debug_info("hpet", this);
#endif
}
void bx_hpet_c::reset(unsigned type)
{
for (int i = 0; i < s.num_timers; i++) {
HPETTimer *timer = &s.timer[i];
hpet_del_timer(timer);
timer->cmp = ~BX_CONST64(0);
timer->config = HPET_TN_PERIODIC_CAP | HPET_TN_SIZE_CAP;
timer->period = BX_CONST64(0);
timer->wrap_flag = 0;
}
s.hpet_counter = BX_CONST64(0);
s.hpet_offset = BX_CONST64(0);
s.config = BX_CONST64(0);
}
void bx_hpet_c::register_state(void)
{
char tnum[10];
bx_list_c *tim;
bx_list_c *list = new bx_list_c(SIM->get_bochs_root(), "hpet", "HPET State");
BXRS_HEX_PARAM_FIELD(list, config, s.config);
BXRS_HEX_PARAM_FIELD(list, isr, s.isr);
BXRS_HEX_PARAM_FIELD(list, hpet_counter, s.hpet_counter);
for (int i = 0; i < s.num_timers; i++) {
sprintf(tnum, "timer%d", i);
tim = new bx_list_c(list, tnum);
BXRS_HEX_PARAM_FIELD(tim, config, s.timer[i].config);
BXRS_HEX_PARAM_FIELD(tim, cmp, s.timer[i].cmp);
BXRS_HEX_PARAM_FIELD(tim, fsb, s.timer[i].fsb);
BXRS_DEC_PARAM_FIELD(tim, period, s.timer[i].period);
BXRS_DEC_PARAM_FIELD(tim, wrap_flag, s.timer[i].wrap_flag);
}
}
Bit64u bx_hpet_c::hpet_get_ticks(void)
{
return ns_to_ticks(bx_pc_system.time_nsec() + s.hpet_offset);
}
/*
* calculate diff between comparator value and current ticks
*/
Bit64u bx_hpet_c::hpet_calculate_diff(HPETTimer *t, Bit64u current)
{
if (t->config & HPET_TN_32BIT) {
Bit32u diff, cmp;
cmp = (Bit32u)t->cmp;
diff = cmp - (Bit32u)current;
diff = (Bit32s)diff > 0 ? diff : (Bit32u)1;
return (Bit64u)diff;
} else {
Bit64u diff2, cmp2;
cmp2 = t->cmp;
diff2 = cmp2 - current;
diff2 = (Bit64s)diff2 > 0 ? diff2 : (Bit64u)1;
return diff2;
}
}
void bx_hpet_c::update_irq(HPETTimer *timer, bx_bool set)
{
Bit64u mask;
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.
*/
route = (timer->tn == 0) ? 0 : RTC_ISA_IRQ;
} else {
route = timer_int_route(timer);
}
mask = (BX_CONST64(1) << timer->tn);
if (!set || !timer_enabled(timer) || !hpet_enabled()) {
s.isr &= ~mask;
if (!timer_fsb_route(timer)) {
DEV_pic_lower_irq(route);
}
} else if (timer_fsb_route(timer)) {
Bit32u val32 = (Bit32u)timer->fsb;
DEV_MEM_WRITE_PHYSICAL((bx_phy_address) (timer->fsb >> 32), sizeof(Bit32u), (Bit8u *) &val32);
} else if (timer->config & HPET_TN_TYPE_LEVEL) {
s.isr |= mask;
DEV_pic_raise_irq(route);
} else {
s.isr &= ~mask;
DEV_pic_raise_irq(route);
DEV_pic_lower_irq(route);
}
}
void bx_hpet_c::timer_handler(void *this_ptr)
{
bx_hpet_c *class_ptr = (bx_hpet_c *) this_ptr;
class_ptr->hpet_timer();
}
void bx_hpet_c::hpet_timer()
{
HPETTimer *t = &s.timer[bx_pc_system.triggeredTimerParam()];
Bit64u diff;
Bit64u period = t->period;
Bit64u 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 = (Bit32u)(t->cmp + t->period);
}
} else {
while (hpet_time_after64(cur_tick, t->cmp)) {
t->cmp += period;
}
}
diff = hpet_calculate_diff(t, cur_tick);
bx_pc_system.activate_timer_nsec(t->timer_id, ticks_to_ns(diff),
timer_is_periodic(t));
} else if ((t->config & HPET_TN_32BIT) && !timer_is_periodic(t)) {
if (t->wrap_flag) {
diff = hpet_calculate_diff(t, cur_tick);
bx_pc_system.activate_timer_nsec(t->timer_id, ticks_to_ns(diff),
timer_is_periodic(t));
t->wrap_flag = 0;
}
}
update_irq(t, 1);
}
void bx_hpet_c::hpet_set_timer(HPETTimer *t)
{
Bit64u diff;
Bit32u wrap_diff; /* how many ticks until we wrap? */
Bit64u 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 - (Bit32u)cur_tick;
if (wrap_diff < (Bit32u)diff) {
diff = wrap_diff;
t->wrap_flag = 1;
}
}
bx_pc_system.activate_timer_nsec(t->timer_id, ticks_to_ns(diff),
timer_is_periodic(t));
}
void bx_hpet_c::hpet_del_timer(HPETTimer *t)
{
bx_pc_system.deactivate_timer(t->timer_id);
update_irq(t, 0);
}
Bit32u bx_hpet_c::read_aligned(bx_phy_address address)
{
Bit32u value = 0;
BX_DEBUG(("read aligned addr=0x" FMT_PHY_ADDRX, address));
Bit16u index = (Bit16u)(address & 0x3ff);
if (index < 0x100) {
switch (index) {
case HPET_ID:
value = (Bit32u)s.capability;
break;
case HPET_PERIOD:
value = (Bit32u)(s.capability >> 32);
break;
case HPET_CFG:
value = (Bit32u)s.config;
break;
case HPET_CFG + 4:
value = (Bit32u)(s.config >> 32);
break;
case HPET_STATUS:
value = (Bit32u)s.isr;
break;
case HPET_STATUS + 2:
value = (Bit32u)(s.isr >> 32);
break;
case HPET_COUNTER:
if (hpet_enabled()) {
value = (Bit32u)hpet_get_ticks();
} else {
value = (Bit32u)s.hpet_counter;
}
break;
case HPET_COUNTER + 4:
if (hpet_enabled()) {
value = (Bit32u)(hpet_get_ticks() >> 32);
} else {
value = (Bit32u)(s.hpet_counter >> 32);
}
break;
default:
BX_ERROR(("read from reserved offset 0x%04x", index));
}
} else {
Bit8u id = (index - 0x100) / 0x20;
if (id >= s.num_timers) {
BX_ERROR(("read: timer id out of range"));
return 0;
}
HPETTimer *timer = &s.timer[id];
switch (index & 0x1f) {
case HPET_TN_CFG:
value = (Bit32u)timer->config;
break;
case HPET_TN_CFG + 4:
value = (Bit32u)(timer->config >> 32);
break;
case HPET_TN_CMP:
value = (Bit32u)timer->cmp;
break;
case HPET_TN_CMP + 4:
value = (Bit32u)(timer->cmp >> 32);
break;
case HPET_TN_ROUTE:
value = (Bit32u)timer->fsb;
break;
case HPET_TN_ROUTE + 4:
value = (Bit32u)(timer->fsb >> 32);
break;
default:
BX_ERROR(("read from reserved offset 0x%04x", index));
}
}
return value;
}
void bx_hpet_c::write_aligned(bx_phy_address address, Bit32u value)
{
int i;
Bit16u index = (Bit16u)(address & 0x3ff);
Bit64u val, new_val = value, old_val = read_aligned(address);
BX_DEBUG(("write aligned addr=0x" FMT_PHY_ADDRX ", data=0x%08x", address, value));
if (index < 0x100) {
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 & BX_CONST64(0xffffffff00000000)) | 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) - bx_pc_system.time_nsec();
for (i = 0; i < s.num_timers; i++) {
if (s.timer[i].cmp != ~BX_CONST64(0U)) {
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 < 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)) {
BX_INFO(("Entering legacy mode"));
DEV_pit_enable_irq(0);
DEV_cmos_enable_irq(0);
} else if (deactivating_bit(old_val, new_val, HPET_CFG_LEGACY)) {
BX_INFO(("Leaving legacy mode"));
DEV_pit_enable_irq(1);
DEV_cmos_enable_irq(1);
}
break;
case HPET_STATUS:
val = new_val & s.isr;
for (i = 0; i < s.num_timers; i++) {
if (val & (BX_CONST64(1) << i)) {
update_irq(&s.timer[i], 0);
}
}
break;
case HPET_COUNTER:
if (hpet_enabled()) {
BX_DEBUG(("Writing counter while HPET enabled!"));
}
s.hpet_counter = (s.hpet_counter & BX_CONST64(0xffffffff00000000)) | value;
break;
case HPET_COUNTER + 4:
if (hpet_enabled()) {
BX_DEBUG(("Writing counter while HPET enabled!"));
}
s.hpet_counter = (s.hpet_counter & BX_CONST64(0xffffffff)) | (((Bit64u)value) << 32);
break;
default:
BX_ERROR(("write to reserved offset 0x%04x", index));
}
} else {
Bit8u id = (index - 0x100) / 0x20;
if (id >= s.num_timers) {
BX_ERROR(("write: timer id out of range"));
return;
}
HPETTimer *timer = &s.timer[id];
switch (index & 0x1f) {
case HPET_TN_CFG:
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 & BX_CONST64(0xffffffff00000000)) | val;
if (new_val & HPET_TN_32BIT) {
timer->cmp = (Bit32u)timer->cmp;
timer->period = (Bit32u)timer->period;
}
if (activating_bit(old_val, new_val, HPET_TN_ENABLE) && hpet_enabled()) {
hpet_set_timer(timer);
} else if (deactivating_bit(old_val, new_val, HPET_TN_ENABLE)) {
hpet_del_timer(timer);
}
break;
case HPET_TN_CMP:
if (timer->config & HPET_TN_32BIT) {
new_val = (Bit32u)new_val;
}
if (!timer_is_periodic(timer) || (timer->config & HPET_TN_SETVAL)) {
timer->cmp = (timer->cmp & BX_CONST64(0xffffffff00000000)) | 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 : ~BX_CONST64(0)) >> 1;
timer->period = (timer->period & BX_CONST64(0xffffffff00000000)) | new_val;
}
timer->config &= ~HPET_TN_SETVAL;
if (hpet_enabled()) {
hpet_set_timer(timer);
}
break;
case HPET_TN_CMP + 4:
if (!timer_is_periodic(timer) || (timer->config & HPET_TN_SETVAL)) {
timer->cmp = (timer->cmp & BX_CONST64(0xffffffff)) | (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 : ~BX_CONST64(0)) >> 1;
timer->period = (timer->period & BX_CONST64(0xffffffff)) | (new_val << 32);
}
timer->config &= ~HPET_TN_SETVAL;
if (hpet_enabled()) {
hpet_set_timer(timer);
}
break;
case HPET_TN_ROUTE:
timer->fsb = (timer->fsb & BX_CONST64(0xffffffff00000000)) | new_val;
break;
case HPET_TN_ROUTE + 4:
timer->fsb = (new_val << 32) | (timer->fsb & 0xffffffff);
break;
default:
BX_ERROR(("write to reserved offset 0x%04x", index));
}
}
}
#if BX_DEBUGGER
void bx_hpet_c::debug_dump(int argc, char **argv)
{
Bit64u value;
dbg_printf("HPET\n\n");
dbg_printf("enable config = %d\n", s.config & 1);
dbg_printf("legacy config = %d\n", (s.config >> 1) & 1);
dbg_printf("interrupt status = 0x%08x\n", (Bit32u)s.isr);
if (hpet_enabled()) {
value = hpet_get_ticks();
} else {
value = s.hpet_counter;
}
dbg_printf("main counter = 0x" FMT_LL "x\n\n", value);
for (int i = 0; i < s.num_timers; i++) {
HPETTimer *timer = &s.timer[i];
dbg_printf("timer #%d (%d-bit)\n", i, ((timer->config & HPET_TN_32BIT) > 0) ? 32:64);
dbg_printf("interrupt enable = %d\n", timer_enabled(timer) > 0);
dbg_printf("periodic mode = %d\n", timer_is_periodic(timer) > 0);
dbg_printf("level sensitive = %d\n", (timer->config & HPET_TN_TYPE_LEVEL) > 0);
if (timer->config & HPET_TN_32BIT) {
dbg_printf("comparator value = 0x%08x\n", (Bit32u)timer->cmp);
dbg_printf("period = 0x%08x\n", (Bit32u)timer->period);
} else {
dbg_printf("comparator value = 0x" FMT_LL "x\n", timer->cmp);
dbg_printf("period = 0x" FMT_LL "x\n", timer->period);
}
}
if (argc > 0) {
dbg_printf("\nAdditional options not supported\n");
}
}
#endif
#endif /* if BX_SUPPORT_PCI */
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