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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen master] x86: PIT emulation is common to both PV and HVM
commit 833a81b439912498e2f554560e296eb6abcf3de7
Author: Wei Liu <wei.liu2@xxxxxxxxxx>
AuthorDate: Tue Sep 4 17:15:22 2018 +0100
Commit: Wei Liu <wei.liu2@xxxxxxxxxx>
CommitDate: Thu Sep 6 16:54:38 2018 +0100
x86: PIT emulation is common to both PV and HVM
Move the file to x86 common code and change its name to emul-i8254.c.
Put HVM only code under CONFIG_HVM or is_hvm_domain.
Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
xen/arch/x86/Makefile | 1 +
xen/arch/x86/emul-i8254.c | 605 ++++++++++++++++++++++++++++++++++++++++++++++
xen/arch/x86/hvm/Makefile | 1 -
xen/arch/x86/hvm/i8254.c | 597 ---------------------------------------------
4 files changed, 606 insertions(+), 598 deletions(-)
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index 2f2ad3adfd..162b0b94c0 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -27,6 +27,7 @@ obj-y += domain.o
obj-bin-y += dom0_build.init.o
obj-y += domain_page.o
obj-y += e820.o
+obj-y += emul-i8254.o
obj-y += extable.o
obj-y += flushtlb.o
obj-$(CONFIG_CRASH_DEBUG) += gdbstub.o
diff --git a/xen/arch/x86/emul-i8254.c b/xen/arch/x86/emul-i8254.c
new file mode 100644
index 0000000000..7f1ded2623
--- /dev/null
+++ b/xen/arch/x86/emul-i8254.c
@@ -0,0 +1,605 @@
+/*
+ * QEMU 8253/8254 interval timer emulation
+ *
+ * Copyright (c) 2003-2004 Fabrice Bellard
+ * Copyright (c) 2006 Intel Corperation
+ * Copyright (c) 2007 Keir Fraser, XenSource Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <xen/types.h>
+#include <xen/mm.h>
+#include <xen/xmalloc.h>
+#include <xen/lib.h>
+#include <xen/errno.h>
+#include <xen/sched.h>
+#include <xen/trace.h>
+#include <asm/time.h>
+#include <asm/hvm/hvm.h>
+#include <asm/hvm/io.h>
+#include <asm/hvm/support.h>
+#include <asm/hvm/vpt.h>
+#include <asm/current.h>
+
+#define domain_vpit(x) (&(x)->arch.vpit)
+#define vcpu_vpit(x) (domain_vpit((x)->domain))
+#define vpit_domain(x) (container_of((x), struct domain, arch.vpit))
+#define vpit_vcpu(x) (pt_global_vcpu_target(vpit_domain(x)))
+
+#define RW_STATE_LSB 1
+#define RW_STATE_MSB 2
+#define RW_STATE_WORD0 3
+#define RW_STATE_WORD1 4
+
+static int handle_pit_io(
+ int dir, unsigned int port, unsigned int bytes, uint32_t *val);
+static int handle_speaker_io(
+ int dir, unsigned int port, unsigned int bytes, uint32_t *val);
+
+#define get_guest_time(v) \
+ (is_hvm_vcpu(v) ? hvm_get_guest_time(v) : (u64)get_s_time())
+
+static int pit_get_count(PITState *pit, int channel)
+{
+ uint64_t d;
+ int counter;
+ struct hvm_hw_pit_channel *c = &pit->hw.channels[channel];
+ struct vcpu *v = vpit_vcpu(pit);
+
+ ASSERT(spin_is_locked(&pit->lock));
+
+ d = muldiv64(get_guest_time(v) - pit->count_load_time[channel],
+ PIT_FREQ, SYSTEM_TIME_HZ);
+
+ switch ( c->mode )
+ {
+ case 0:
+ case 1:
+ case 4:
+ case 5:
+ counter = (c->count - d) & 0xffff;
+ break;
+ case 3:
+ /* XXX: may be incorrect for odd counts */
+ counter = c->count - ((2 * d) % c->count);
+ break;
+ default:
+ counter = c->count - (d % c->count);
+ break;
+ }
+ return counter;
+}
+
+static int pit_get_out(PITState *pit, int channel)
+{
+ struct hvm_hw_pit_channel *s = &pit->hw.channels[channel];
+ uint64_t d;
+ int out;
+ struct vcpu *v = vpit_vcpu(pit);
+
+ ASSERT(spin_is_locked(&pit->lock));
+
+ d = muldiv64(get_guest_time(v) - pit->count_load_time[channel],
+ PIT_FREQ, SYSTEM_TIME_HZ);
+
+ switch ( s->mode )
+ {
+ default:
+ case 0:
+ out = (d >= s->count);
+ break;
+ case 1:
+ out = (d < s->count);
+ break;
+ case 2:
+ out = (((d % s->count) == 0) && (d != 0));
+ break;
+ case 3:
+ out = ((d % s->count) < ((s->count + 1) >> 1));
+ break;
+ case 4:
+ case 5:
+ out = (d == s->count);
+ break;
+ }
+
+ return out;
+}
+
+static void pit_set_gate(PITState *pit, int channel, int val)
+{
+ struct hvm_hw_pit_channel *s = &pit->hw.channels[channel];
+ struct vcpu *v = vpit_vcpu(pit);
+
+ ASSERT(spin_is_locked(&pit->lock));
+
+ switch ( s->mode )
+ {
+ default:
+ case 0:
+ case 4:
+ /* XXX: just disable/enable counting */
+ break;
+ case 1:
+ case 5:
+ case 2:
+ case 3:
+ /* Restart counting on rising edge. */
+ if ( s->gate < val )
+ pit->count_load_time[channel] = get_guest_time(v);
+ break;
+ }
+
+ s->gate = val;
+}
+
+static int pit_get_gate(PITState *pit, int channel)
+{
+ ASSERT(spin_is_locked(&pit->lock));
+ return pit->hw.channels[channel].gate;
+}
+
+static void pit_time_fired(struct vcpu *v, void *priv)
+{
+ uint64_t *count_load_time = priv;
+ TRACE_0D(TRC_HVM_EMUL_PIT_TIMER_CB);
+ *count_load_time = get_guest_time(v);
+}
+
+static void pit_load_count(PITState *pit, int channel, int val)
+{
+ u32 period;
+ struct hvm_hw_pit_channel *s = &pit->hw.channels[channel];
+ struct vcpu *v = vpit_vcpu(pit);
+
+ ASSERT(spin_is_locked(&pit->lock));
+
+ if ( val == 0 )
+ val = 0x10000;
+
+ if ( v == NULL )
+ pit->count_load_time[channel] = 0;
+ else
+ pit->count_load_time[channel] = get_guest_time(v);
+ s->count = val;
+ period = DIV_ROUND(val * SYSTEM_TIME_HZ, PIT_FREQ);
+
+ if ( (v == NULL) || !is_hvm_vcpu(v) || (channel != 0) )
+ return;
+
+ switch ( s->mode )
+ {
+ case 2:
+ case 3:
+ /* Periodic timer. */
+ TRACE_2D(TRC_HVM_EMUL_PIT_START_TIMER, period, period);
+ create_periodic_time(v, &pit->pt0, period, period, 0, pit_time_fired,
+ &pit->count_load_time[channel], false);
+ break;
+ case 1:
+ case 4:
+ /* One-shot timer. */
+ TRACE_2D(TRC_HVM_EMUL_PIT_START_TIMER, period, 0);
+ create_periodic_time(v, &pit->pt0, period, 0, 0, pit_time_fired,
+ &pit->count_load_time[channel], false);
+ break;
+ default:
+ TRACE_0D(TRC_HVM_EMUL_PIT_STOP_TIMER);
+ destroy_periodic_time(&pit->pt0);
+ break;
+ }
+}
+
+static void pit_latch_count(PITState *pit, int channel)
+{
+ struct hvm_hw_pit_channel *c = &pit->hw.channels[channel];
+
+ ASSERT(spin_is_locked(&pit->lock));
+
+ if ( !c->count_latched )
+ {
+ c->latched_count = pit_get_count(pit, channel);
+ c->count_latched = c->rw_mode;
+ }
+}
+
+static void pit_latch_status(PITState *pit, int channel)
+{
+ struct hvm_hw_pit_channel *c = &pit->hw.channels[channel];
+
+ ASSERT(spin_is_locked(&pit->lock));
+
+ if ( !c->status_latched )
+ {
+ /* TODO: Return NULL COUNT (bit 6). */
+ c->status = ((pit_get_out(pit, channel) << 7) |
+ (c->rw_mode << 4) |
+ (c->mode << 1) |
+ c->bcd);
+ c->status_latched = 1;
+ }
+}
+
+static void pit_ioport_write(struct PITState *pit, uint32_t addr, uint32_t val)
+{
+ int channel, access;
+ struct hvm_hw_pit_channel *s;
+
+ val &= 0xff;
+ addr &= 3;
+
+ spin_lock(&pit->lock);
+
+ if ( addr == 3 )
+ {
+ channel = val >> 6;
+ if ( channel == 3 )
+ {
+ /* Read-Back Command. */
+ for ( channel = 0; channel < 3; channel++ )
+ {
+ s = &pit->hw.channels[channel];
+ if ( val & (2 << channel) )
+ {
+ if ( !(val & 0x20) )
+ pit_latch_count(pit, channel);
+ if ( !(val & 0x10) )
+ pit_latch_status(pit, channel);
+ }
+ }
+ }
+ else
+ {
+ /* Select Counter <channel>. */
+ s = &pit->hw.channels[channel];
+ access = (val >> 4) & 3;
+ if ( access == 0 )
+ {
+ pit_latch_count(pit, channel);
+ }
+ else
+ {
+ s->rw_mode = access;
+ s->read_state = access;
+ s->write_state = access;
+ s->mode = (val >> 1) & 7;
+ if ( s->mode > 5 )
+ s->mode -= 4;
+ s->bcd = val & 1;
+ /* XXX: update irq timer ? */
+ }
+ }
+ }
+ else
+ {
+ /* Write Count. */
+ s = &pit->hw.channels[addr];
+ switch ( s->write_state )
+ {
+ default:
+ case RW_STATE_LSB:
+ pit_load_count(pit, addr, val);
+ break;
+ case RW_STATE_MSB:
+ pit_load_count(pit, addr, val << 8);
+ break;
+ case RW_STATE_WORD0:
+ s->write_latch = val;
+ s->write_state = RW_STATE_WORD1;
+ break;
+ case RW_STATE_WORD1:
+ pit_load_count(pit, addr, s->write_latch | (val << 8));
+ s->write_state = RW_STATE_WORD0;
+ break;
+ }
+ }
+
+ spin_unlock(&pit->lock);
+}
+
+static uint32_t pit_ioport_read(struct PITState *pit, uint32_t addr)
+{
+ int ret, count;
+ struct hvm_hw_pit_channel *s;
+
+ addr &= 3;
+ s = &pit->hw.channels[addr];
+
+ spin_lock(&pit->lock);
+
+ if ( s->status_latched )
+ {
+ s->status_latched = 0;
+ ret = s->status;
+ }
+ else if ( s->count_latched )
+ {
+ switch ( s->count_latched )
+ {
+ default:
+ case RW_STATE_LSB:
+ ret = s->latched_count & 0xff;
+ s->count_latched = 0;
+ break;
+ case RW_STATE_MSB:
+ ret = s->latched_count >> 8;
+ s->count_latched = 0;
+ break;
+ case RW_STATE_WORD0:
+ ret = s->latched_count & 0xff;
+ s->count_latched = RW_STATE_MSB;
+ break;
+ }
+ }
+ else
+ {
+ switch ( s->read_state )
+ {
+ default:
+ case RW_STATE_LSB:
+ count = pit_get_count(pit, addr);
+ ret = count & 0xff;
+ break;
+ case RW_STATE_MSB:
+ count = pit_get_count(pit, addr);
+ ret = (count >> 8) & 0xff;
+ break;
+ case RW_STATE_WORD0:
+ count = pit_get_count(pit, addr);
+ ret = count & 0xff;
+ s->read_state = RW_STATE_WORD1;
+ break;
+ case RW_STATE_WORD1:
+ count = pit_get_count(pit, addr);
+ ret = (count >> 8) & 0xff;
+ s->read_state = RW_STATE_WORD0;
+ break;
+ }
+ }
+
+ spin_unlock(&pit->lock);
+
+ return ret;
+}
+
+#ifdef CONFIG_HVM
+void pit_stop_channel0_irq(PITState *pit)
+{
+ if ( !has_vpit(current->domain) )
+ return;
+
+ TRACE_0D(TRC_HVM_EMUL_PIT_STOP_TIMER);
+ spin_lock(&pit->lock);
+ destroy_periodic_time(&pit->pt0);
+ spin_unlock(&pit->lock);
+}
+
+static int pit_save(struct domain *d, hvm_domain_context_t *h)
+{
+ PITState *pit = domain_vpit(d);
+ int rc;
+
+ if ( !has_vpit(d) )
+ return 0;
+
+ spin_lock(&pit->lock);
+
+ rc = hvm_save_entry(PIT, 0, h, &pit->hw);
+
+ spin_unlock(&pit->lock);
+
+ return rc;
+}
+
+static int pit_load(struct domain *d, hvm_domain_context_t *h)
+{
+ PITState *pit = domain_vpit(d);
+ int i;
+
+ if ( !has_vpit(d) )
+ return -ENODEV;
+
+ spin_lock(&pit->lock);
+
+ if ( hvm_load_entry(PIT, h, &pit->hw) )
+ {
+ spin_unlock(&pit->lock);
+ return 1;
+ }
+
+ /*
+ * Recreate platform timers from hardware state. There will be some
+ * time jitter here, but the wall-clock will have jumped massively, so
+ * we hope the guest can handle it.
+ */
+ pit->pt0.last_plt_gtime = get_guest_time(d->vcpu[0]);
+ for ( i = 0; i < 3; i++ )
+ pit_load_count(pit, i, pit->hw.channels[i].count);
+
+ spin_unlock(&pit->lock);
+
+ return 0;
+}
+
+HVM_REGISTER_SAVE_RESTORE(PIT, pit_save, pit_load, 1, HVMSR_PER_DOM);
+#endif
+
+void pit_reset(struct domain *d)
+{
+ PITState *pit = domain_vpit(d);
+ struct hvm_hw_pit_channel *s;
+ int i;
+
+ if ( !has_vpit(d) )
+ return;
+
+ if ( is_hvm_domain(d) )
+ {
+ TRACE_0D(TRC_HVM_EMUL_PIT_STOP_TIMER);
+ destroy_periodic_time(&pit->pt0);
+ pit->pt0.source = PTSRC_isa;
+ }
+
+ spin_lock(&pit->lock);
+
+ for ( i = 0; i < 3; i++ )
+ {
+ s = &pit->hw.channels[i];
+ s->mode = 0xff; /* the init mode */
+ s->gate = (i != 2);
+ pit_load_count(pit, i, 0);
+ }
+
+ spin_unlock(&pit->lock);
+}
+
+void pit_init(struct domain *d, unsigned long cpu_khz)
+{
+ PITState *pit = domain_vpit(d);
+
+ if ( !has_vpit(d) )
+ return;
+
+ spin_lock_init(&pit->lock);
+
+ if ( is_hvm_domain(d) )
+ {
+ register_portio_handler(d, PIT_BASE, 4, handle_pit_io);
+ register_portio_handler(d, 0x61, 1, handle_speaker_io);
+ }
+
+ pit_reset(d);
+}
+
+void pit_deinit(struct domain *d)
+{
+ PITState *pit = domain_vpit(d);
+
+ if ( !has_vpit(d) )
+ return;
+
+ if ( is_hvm_domain(d) )
+ {
+ TRACE_0D(TRC_HVM_EMUL_PIT_STOP_TIMER);
+ destroy_periodic_time(&pit->pt0);
+ }
+}
+
+/* the intercept action for PIT DM retval:0--not handled; 1--handled */
+static int handle_pit_io(
+ int dir, unsigned int port, unsigned int bytes, uint32_t *val)
+{
+ struct PITState *vpit = vcpu_vpit(current);
+
+ if ( bytes != 1 )
+ {
+ gdprintk(XENLOG_WARNING, "PIT bad access\n");
+ *val = ~0;
+ return X86EMUL_OKAY;
+ }
+
+ if ( dir == IOREQ_WRITE )
+ {
+ pit_ioport_write(vpit, port, *val);
+ }
+ else
+ {
+ if ( (port & 3) != 3 )
+ *val = pit_ioport_read(vpit, port);
+ else
+ gdprintk(XENLOG_WARNING, "PIT: read A1:A0=3!\n");
+ }
+
+ return X86EMUL_OKAY;
+}
+
+static void speaker_ioport_write(
+ struct PITState *pit, uint32_t addr, uint32_t val)
+{
+ pit->hw.speaker_data_on = (val >> 1) & 1;
+ pit_set_gate(pit, 2, val & 1);
+}
+
+static uint32_t speaker_ioport_read(
+ struct PITState *pit, uint32_t addr)
+{
+ /* Refresh clock toggles at about 15us. We approximate as 2^14ns. */
+ unsigned int refresh_clock = ((unsigned int)NOW() >> 14) & 1;
+ return ((pit->hw.speaker_data_on << 1) | pit_get_gate(pit, 2) |
+ (pit_get_out(pit, 2) << 5) | (refresh_clock << 4));
+}
+
+static int handle_speaker_io(
+ int dir, unsigned int port, uint32_t bytes, uint32_t *val)
+{
+ struct PITState *vpit = vcpu_vpit(current);
+
+ BUG_ON(bytes != 1);
+
+ spin_lock(&vpit->lock);
+
+ if ( dir == IOREQ_WRITE )
+ speaker_ioport_write(vpit, port, *val);
+ else
+ *val = speaker_ioport_read(vpit, port);
+
+ spin_unlock(&vpit->lock);
+
+ return X86EMUL_OKAY;
+}
+
+int pv_pit_handler(int port, int data, int write)
+{
+ ioreq_t ioreq = {
+ .size = 1,
+ .type = IOREQ_TYPE_PIO,
+ .addr = port,
+ .dir = write ? IOREQ_WRITE : IOREQ_READ,
+ .data = data
+ };
+
+ if ( !has_vpit(current->domain) )
+ return ~0;
+
+ if ( is_hardware_domain(current->domain) && hwdom_pit_access(&ioreq) )
+ {
+ /* nothing to do */;
+ }
+ else
+ {
+ uint32_t val = data;
+ if ( port == 0x61 )
+ handle_speaker_io(ioreq.dir, port, 1, &val);
+ else
+ handle_pit_io(ioreq.dir, port, 1, &val);
+ ioreq.data = val;
+ }
+
+ return !write ? ioreq.data : 0;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/x86/hvm/Makefile b/xen/arch/x86/hvm/Makefile
index 5bd38f633f..5e04bc1429 100644
--- a/xen/arch/x86/hvm/Makefile
+++ b/xen/arch/x86/hvm/Makefile
@@ -10,7 +10,6 @@ obj-y += grant_table.o
obj-y += hpet.o
obj-y += hvm.o
obj-y += hypercall.o
-obj-y += i8254.o
obj-y += intercept.o
obj-y += io.o
obj-y += ioreq.o
diff --git a/xen/arch/x86/hvm/i8254.c b/xen/arch/x86/hvm/i8254.c
deleted file mode 100644
index b8ec56f8d3..0000000000
--- a/xen/arch/x86/hvm/i8254.c
+++ /dev/null
@@ -1,597 +0,0 @@
-/*
- * QEMU 8253/8254 interval timer emulation
- *
- * Copyright (c) 2003-2004 Fabrice Bellard
- * Copyright (c) 2006 Intel Corperation
- * Copyright (c) 2007 Keir Fraser, XenSource Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-
-#include <xen/types.h>
-#include <xen/mm.h>
-#include <xen/xmalloc.h>
-#include <xen/lib.h>
-#include <xen/errno.h>
-#include <xen/sched.h>
-#include <xen/trace.h>
-#include <asm/time.h>
-#include <asm/hvm/hvm.h>
-#include <asm/hvm/io.h>
-#include <asm/hvm/support.h>
-#include <asm/hvm/vpt.h>
-#include <asm/current.h>
-
-#define domain_vpit(x) (&(x)->arch.vpit)
-#define vcpu_vpit(x) (domain_vpit((x)->domain))
-#define vpit_domain(x) (container_of((x), struct domain, arch.vpit))
-#define vpit_vcpu(x) (pt_global_vcpu_target(vpit_domain(x)))
-
-#define RW_STATE_LSB 1
-#define RW_STATE_MSB 2
-#define RW_STATE_WORD0 3
-#define RW_STATE_WORD1 4
-
-static int handle_pit_io(
- int dir, unsigned int port, unsigned int bytes, uint32_t *val);
-static int handle_speaker_io(
- int dir, unsigned int port, unsigned int bytes, uint32_t *val);
-
-#define get_guest_time(v) \
- (is_hvm_vcpu(v) ? hvm_get_guest_time(v) : (u64)get_s_time())
-
-static int pit_get_count(PITState *pit, int channel)
-{
- uint64_t d;
- int counter;
- struct hvm_hw_pit_channel *c = &pit->hw.channels[channel];
- struct vcpu *v = vpit_vcpu(pit);
-
- ASSERT(spin_is_locked(&pit->lock));
-
- d = muldiv64(get_guest_time(v) - pit->count_load_time[channel],
- PIT_FREQ, SYSTEM_TIME_HZ);
-
- switch ( c->mode )
- {
- case 0:
- case 1:
- case 4:
- case 5:
- counter = (c->count - d) & 0xffff;
- break;
- case 3:
- /* XXX: may be incorrect for odd counts */
- counter = c->count - ((2 * d) % c->count);
- break;
- default:
- counter = c->count - (d % c->count);
- break;
- }
- return counter;
-}
-
-static int pit_get_out(PITState *pit, int channel)
-{
- struct hvm_hw_pit_channel *s = &pit->hw.channels[channel];
- uint64_t d;
- int out;
- struct vcpu *v = vpit_vcpu(pit);
-
- ASSERT(spin_is_locked(&pit->lock));
-
- d = muldiv64(get_guest_time(v) - pit->count_load_time[channel],
- PIT_FREQ, SYSTEM_TIME_HZ);
-
- switch ( s->mode )
- {
- default:
- case 0:
- out = (d >= s->count);
- break;
- case 1:
- out = (d < s->count);
- break;
- case 2:
- out = (((d % s->count) == 0) && (d != 0));
- break;
- case 3:
- out = ((d % s->count) < ((s->count + 1) >> 1));
- break;
- case 4:
- case 5:
- out = (d == s->count);
- break;
- }
-
- return out;
-}
-
-static void pit_set_gate(PITState *pit, int channel, int val)
-{
- struct hvm_hw_pit_channel *s = &pit->hw.channels[channel];
- struct vcpu *v = vpit_vcpu(pit);
-
- ASSERT(spin_is_locked(&pit->lock));
-
- switch ( s->mode )
- {
- default:
- case 0:
- case 4:
- /* XXX: just disable/enable counting */
- break;
- case 1:
- case 5:
- case 2:
- case 3:
- /* Restart counting on rising edge. */
- if ( s->gate < val )
- pit->count_load_time[channel] = get_guest_time(v);
- break;
- }
-
- s->gate = val;
-}
-
-static int pit_get_gate(PITState *pit, int channel)
-{
- ASSERT(spin_is_locked(&pit->lock));
- return pit->hw.channels[channel].gate;
-}
-
-static void pit_time_fired(struct vcpu *v, void *priv)
-{
- uint64_t *count_load_time = priv;
- TRACE_0D(TRC_HVM_EMUL_PIT_TIMER_CB);
- *count_load_time = get_guest_time(v);
-}
-
-static void pit_load_count(PITState *pit, int channel, int val)
-{
- u32 period;
- struct hvm_hw_pit_channel *s = &pit->hw.channels[channel];
- struct vcpu *v = vpit_vcpu(pit);
-
- ASSERT(spin_is_locked(&pit->lock));
-
- if ( val == 0 )
- val = 0x10000;
-
- if ( v == NULL )
- pit->count_load_time[channel] = 0;
- else
- pit->count_load_time[channel] = get_guest_time(v);
- s->count = val;
- period = DIV_ROUND(val * SYSTEM_TIME_HZ, PIT_FREQ);
-
- if ( (v == NULL) || !is_hvm_vcpu(v) || (channel != 0) )
- return;
-
- switch ( s->mode )
- {
- case 2:
- case 3:
- /* Periodic timer. */
- TRACE_2D(TRC_HVM_EMUL_PIT_START_TIMER, period, period);
- create_periodic_time(v, &pit->pt0, period, period, 0, pit_time_fired,
- &pit->count_load_time[channel], false);
- break;
- case 1:
- case 4:
- /* One-shot timer. */
- TRACE_2D(TRC_HVM_EMUL_PIT_START_TIMER, period, 0);
- create_periodic_time(v, &pit->pt0, period, 0, 0, pit_time_fired,
- &pit->count_load_time[channel], false);
- break;
- default:
- TRACE_0D(TRC_HVM_EMUL_PIT_STOP_TIMER);
- destroy_periodic_time(&pit->pt0);
- break;
- }
-}
-
-static void pit_latch_count(PITState *pit, int channel)
-{
- struct hvm_hw_pit_channel *c = &pit->hw.channels[channel];
-
- ASSERT(spin_is_locked(&pit->lock));
-
- if ( !c->count_latched )
- {
- c->latched_count = pit_get_count(pit, channel);
- c->count_latched = c->rw_mode;
- }
-}
-
-static void pit_latch_status(PITState *pit, int channel)
-{
- struct hvm_hw_pit_channel *c = &pit->hw.channels[channel];
-
- ASSERT(spin_is_locked(&pit->lock));
-
- if ( !c->status_latched )
- {
- /* TODO: Return NULL COUNT (bit 6). */
- c->status = ((pit_get_out(pit, channel) << 7) |
- (c->rw_mode << 4) |
- (c->mode << 1) |
- c->bcd);
- c->status_latched = 1;
- }
-}
-
-static void pit_ioport_write(struct PITState *pit, uint32_t addr, uint32_t val)
-{
- int channel, access;
- struct hvm_hw_pit_channel *s;
-
- val &= 0xff;
- addr &= 3;
-
- spin_lock(&pit->lock);
-
- if ( addr == 3 )
- {
- channel = val >> 6;
- if ( channel == 3 )
- {
- /* Read-Back Command. */
- for ( channel = 0; channel < 3; channel++ )
- {
- s = &pit->hw.channels[channel];
- if ( val & (2 << channel) )
- {
- if ( !(val & 0x20) )
- pit_latch_count(pit, channel);
- if ( !(val & 0x10) )
- pit_latch_status(pit, channel);
- }
- }
- }
- else
- {
- /* Select Counter <channel>. */
- s = &pit->hw.channels[channel];
- access = (val >> 4) & 3;
- if ( access == 0 )
- {
- pit_latch_count(pit, channel);
- }
- else
- {
- s->rw_mode = access;
- s->read_state = access;
- s->write_state = access;
- s->mode = (val >> 1) & 7;
- if ( s->mode > 5 )
- s->mode -= 4;
- s->bcd = val & 1;
- /* XXX: update irq timer ? */
- }
- }
- }
- else
- {
- /* Write Count. */
- s = &pit->hw.channels[addr];
- switch ( s->write_state )
- {
- default:
- case RW_STATE_LSB:
- pit_load_count(pit, addr, val);
- break;
- case RW_STATE_MSB:
- pit_load_count(pit, addr, val << 8);
- break;
- case RW_STATE_WORD0:
- s->write_latch = val;
- s->write_state = RW_STATE_WORD1;
- break;
- case RW_STATE_WORD1:
- pit_load_count(pit, addr, s->write_latch | (val << 8));
- s->write_state = RW_STATE_WORD0;
- break;
- }
- }
-
- spin_unlock(&pit->lock);
-}
-
-static uint32_t pit_ioport_read(struct PITState *pit, uint32_t addr)
-{
- int ret, count;
- struct hvm_hw_pit_channel *s;
-
- addr &= 3;
- s = &pit->hw.channels[addr];
-
- spin_lock(&pit->lock);
-
- if ( s->status_latched )
- {
- s->status_latched = 0;
- ret = s->status;
- }
- else if ( s->count_latched )
- {
- switch ( s->count_latched )
- {
- default:
- case RW_STATE_LSB:
- ret = s->latched_count & 0xff;
- s->count_latched = 0;
- break;
- case RW_STATE_MSB:
- ret = s->latched_count >> 8;
- s->count_latched = 0;
- break;
- case RW_STATE_WORD0:
- ret = s->latched_count & 0xff;
- s->count_latched = RW_STATE_MSB;
- break;
- }
- }
- else
- {
- switch ( s->read_state )
- {
- default:
- case RW_STATE_LSB:
- count = pit_get_count(pit, addr);
- ret = count & 0xff;
- break;
- case RW_STATE_MSB:
- count = pit_get_count(pit, addr);
- ret = (count >> 8) & 0xff;
- break;
- case RW_STATE_WORD0:
- count = pit_get_count(pit, addr);
- ret = count & 0xff;
- s->read_state = RW_STATE_WORD1;
- break;
- case RW_STATE_WORD1:
- count = pit_get_count(pit, addr);
- ret = (count >> 8) & 0xff;
- s->read_state = RW_STATE_WORD0;
- break;
- }
- }
-
- spin_unlock(&pit->lock);
-
- return ret;
-}
-
-void pit_stop_channel0_irq(PITState *pit)
-{
- if ( !has_vpit(current->domain) )
- return;
-
- TRACE_0D(TRC_HVM_EMUL_PIT_STOP_TIMER);
- spin_lock(&pit->lock);
- destroy_periodic_time(&pit->pt0);
- spin_unlock(&pit->lock);
-}
-
-static int pit_save(struct domain *d, hvm_domain_context_t *h)
-{
- PITState *pit = domain_vpit(d);
- int rc;
-
- if ( !has_vpit(d) )
- return 0;
-
- spin_lock(&pit->lock);
-
- rc = hvm_save_entry(PIT, 0, h, &pit->hw);
-
- spin_unlock(&pit->lock);
-
- return rc;
-}
-
-static int pit_load(struct domain *d, hvm_domain_context_t *h)
-{
- PITState *pit = domain_vpit(d);
- int i;
-
- if ( !has_vpit(d) )
- return -ENODEV;
-
- spin_lock(&pit->lock);
-
- if ( hvm_load_entry(PIT, h, &pit->hw) )
- {
- spin_unlock(&pit->lock);
- return 1;
- }
-
- /*
- * Recreate platform timers from hardware state. There will be some
- * time jitter here, but the wall-clock will have jumped massively, so
- * we hope the guest can handle it.
- */
- pit->pt0.last_plt_gtime = get_guest_time(d->vcpu[0]);
- for ( i = 0; i < 3; i++ )
- pit_load_count(pit, i, pit->hw.channels[i].count);
-
- spin_unlock(&pit->lock);
-
- return 0;
-}
-
-HVM_REGISTER_SAVE_RESTORE(PIT, pit_save, pit_load, 1, HVMSR_PER_DOM);
-
-void pit_reset(struct domain *d)
-{
- PITState *pit = domain_vpit(d);
- struct hvm_hw_pit_channel *s;
- int i;
-
- if ( !has_vpit(d) )
- return;
-
- TRACE_0D(TRC_HVM_EMUL_PIT_STOP_TIMER);
- destroy_periodic_time(&pit->pt0);
- pit->pt0.source = PTSRC_isa;
-
- spin_lock(&pit->lock);
-
- for ( i = 0; i < 3; i++ )
- {
- s = &pit->hw.channels[i];
- s->mode = 0xff; /* the init mode */
- s->gate = (i != 2);
- pit_load_count(pit, i, 0);
- }
-
- spin_unlock(&pit->lock);
-}
-
-void pit_init(struct domain *d, unsigned long cpu_khz)
-{
- PITState *pit = domain_vpit(d);
-
- if ( !has_vpit(d) )
- return;
-
- spin_lock_init(&pit->lock);
-
- if ( is_hvm_domain(d) )
- {
- register_portio_handler(d, PIT_BASE, 4, handle_pit_io);
- register_portio_handler(d, 0x61, 1, handle_speaker_io);
- }
-
- pit_reset(d);
-}
-
-void pit_deinit(struct domain *d)
-{
- PITState *pit = domain_vpit(d);
-
- if ( !has_vpit(d) )
- return;
-
- TRACE_0D(TRC_HVM_EMUL_PIT_STOP_TIMER);
- destroy_periodic_time(&pit->pt0);
-}
-
-/* the intercept action for PIT DM retval:0--not handled; 1--handled */
-static int handle_pit_io(
- int dir, unsigned int port, unsigned int bytes, uint32_t *val)
-{
- struct PITState *vpit = vcpu_vpit(current);
-
- if ( bytes != 1 )
- {
- gdprintk(XENLOG_WARNING, "PIT bad access\n");
- *val = ~0;
- return X86EMUL_OKAY;
- }
-
- if ( dir == IOREQ_WRITE )
- {
- pit_ioport_write(vpit, port, *val);
- }
- else
- {
- if ( (port & 3) != 3 )
- *val = pit_ioport_read(vpit, port);
- else
- gdprintk(XENLOG_WARNING, "PIT: read A1:A0=3!\n");
- }
-
- return X86EMUL_OKAY;
-}
-
-static void speaker_ioport_write(
- struct PITState *pit, uint32_t addr, uint32_t val)
-{
- pit->hw.speaker_data_on = (val >> 1) & 1;
- pit_set_gate(pit, 2, val & 1);
-}
-
-static uint32_t speaker_ioport_read(
- struct PITState *pit, uint32_t addr)
-{
- /* Refresh clock toggles at about 15us. We approximate as 2^14ns. */
- unsigned int refresh_clock = ((unsigned int)NOW() >> 14) & 1;
- return ((pit->hw.speaker_data_on << 1) | pit_get_gate(pit, 2) |
- (pit_get_out(pit, 2) << 5) | (refresh_clock << 4));
-}
-
-static int handle_speaker_io(
- int dir, unsigned int port, uint32_t bytes, uint32_t *val)
-{
- struct PITState *vpit = vcpu_vpit(current);
-
- BUG_ON(bytes != 1);
-
- spin_lock(&vpit->lock);
-
- if ( dir == IOREQ_WRITE )
- speaker_ioport_write(vpit, port, *val);
- else
- *val = speaker_ioport_read(vpit, port);
-
- spin_unlock(&vpit->lock);
-
- return X86EMUL_OKAY;
-}
-
-int pv_pit_handler(int port, int data, int write)
-{
- ioreq_t ioreq = {
- .size = 1,
- .type = IOREQ_TYPE_PIO,
- .addr = port,
- .dir = write ? IOREQ_WRITE : IOREQ_READ,
- .data = data
- };
-
- if ( !has_vpit(current->domain) )
- return ~0;
-
- if ( is_hardware_domain(current->domain) && hwdom_pit_access(&ioreq) )
- {
- /* nothing to do */;
- }
- else
- {
- uint32_t val = data;
- if ( port == 0x61 )
- handle_speaker_io(ioreq.dir, port, 1, &val);
- else
- handle_pit_io(ioreq.dir, port, 1, &val);
- ioreq.data = val;
- }
-
- return !write ? ioreq.data : 0;
-}
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * indent-tabs-mode: nil
- * End:
- */
--
generated by git-patchbot for /home/xen/git/xen.git#master
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