Add HPET device emulation to bhyve.

bhyve supports a single timer block with 8 timers. The timers are all 32-bit
and capable of being operated in periodic mode. All timers support interrupt
delivery using MSI. Timers 0 and 1 also support legacy interrupt routing.

At the moment the timers are not connected to any ioapic pins but that will
be addressed in a subsequent commit.

This change is based on a patch from Tycho Nightingale (tycho.nightingale@pluribusnetworks.com).

2 files changed, 15 insertions, 0 deletions

diff --git a/lib/libvmmapi/vmmapi.c b/lib/libvmmapi/vmmapi.c
index 85b1069..c2851a4 100644
--- a/lib/libvmmapi/vmmapi.c
+++ b/lib/libvmmapi/vmmapi.c
@@ -825,3 +825,16 @@ vm_get_gpa_pmap(struct vmctx *ctx, uint64_t gpa, uint64_t *pte, int *num)
 
 	return (error);
 }
+
+int
+vm_get_hpet_capabilities(struct vmctx *ctx, uint32_t *capabilities)
+{
+	int error;
+	struct vm_hpet_cap cap;
+
+	bzero(&cap, sizeof(struct vm_hpet_cap));
+	error = ioctl(ctx->fd, VM_GET_HPET_CAPABILITIES, &cap);
+	if (capabilities != NULL)
+		*capabilities = cap.capabilities;
+	return (error);
+}
diff --git a/lib/libvmmapi/vmmapi.h b/lib/libvmmapi/vmmapi.h
index 8eaea29..293c431 100644
--- a/lib/libvmmapi/vmmapi.h
+++ b/lib/libvmmapi/vmmapi.h
@@ -96,6 +96,8 @@ const char *vm_get_stat_desc(struct vmctx *ctx, int index);
 int	vm_get_x2apic_state(struct vmctx *ctx, int vcpu, enum x2apic_state *s);
 int	vm_set_x2apic_state(struct vmctx *ctx, int vcpu, enum x2apic_state s);
 
+int	vm_get_hpet_capabilities(struct vmctx *ctx, uint32_t *capabilities);
+
 /* Reset vcpu register state */
 int	vcpu_reset(struct vmctx *ctx, int vcpu);