[PATCH RFC 05/13] xen: implement Xen IO APIC ops

[Roger Pau Monne <roger.pau@citrix.com>]

Implement a different set of hooks for IO APIC to use when running
under Xen Dom0.
---
 sys/x86/xen/pv.c |   44 ++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/sys/x86/xen/pv.c b/sys/x86/xen/pv.c
index ab4afba..e5ad200 100644
--- a/sys/x86/xen/pv.c
+++ b/sys/x86/xen/pv.c
@@ -49,6 +49,7 @@ __FBSDID("$FreeBSD$");
 #include <vm/vm_pager.h>
 #include <vm/vm_param.h>
 
+#include <x86/apicreg.h>
 #include <machine/sysarch.h>
 #include <machine/clock.h>
 #include <machine/pc/bios.h>
@@ -58,6 +59,7 @@ __FBSDID("$FreeBSD$");
 #include <xen/xen-os.h>
 #include <xen/hypervisor.h>
 #include <xen/pv.h>
+#include <xen/xen_intr.h>
 
 #include <xen/interface/vcpu.h>
 
@@ -73,6 +75,11 @@ static caddr_t xen_pv_parse_preload_data(u_int64_t);
 static void xen_pv_parse_memmap(caddr_t, vm_paddr_t *, int *);
 
 static void xen_pv_set_init_ops(void);
+
+static u_int xen_pv_ioapic_read(volatile ioapic_t *, int);
+static void xen_pv_ioapic_write(volatile ioapic_t *, int, u_int);
+static void xen_pv_ioapic_register_intr(struct ioapic_intsrc *);
+
 /*---------------------------- Extern Declarations ---------------------------*/
 /* Variables used by amd64 mp_machdep to start APs */
 extern struct mtx ap_boot_mtx;
@@ -92,6 +99,13 @@ struct init_ops xen_init_ops = {
 	.parse_memmap =		xen_pv_parse_memmap,
 };
 
+/* Xen ioapic_ops implementation */
+struct ioapic_ops xen_ioapic_ops = {
+	.read =			xen_pv_ioapic_read,
+	.write =		xen_pv_ioapic_write,
+	.register_intr =	xen_pv_ioapic_register_intr,
+};
+
 static struct
 {
 	const char	*ev;
@@ -342,6 +356,34 @@ xen_pv_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx)
 	bios_add_smap_entries(xen_smap, size, physmap, physmap_idx);
 }
 
+static u_int
+xen_pv_ioapic_read(volatile ioapic_t *apic, int reg)
+{
+	struct physdev_apic apic_op;
+	int rc;
+
+	mtx_assert(&icu_lock, MA_OWNED);
+
+	apic_op.apic_physbase = pmap_kextract((vm_offset_t) apic);
+	apic_op.reg = reg;
+	rc = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
+	if (rc)
+		panic("apic_read operation failed");
+
+	return (apic_op.value);
+}
+
+static void
+xen_pv_ioapic_write(volatile ioapic_t *apic, int reg, u_int val)
+{
+}
+
+static void
+xen_pv_ioapic_register_intr(struct ioapic_intsrc *pin)
+{
+	xen_register_pirq(pin->io_irq, pin->io_activehi, pin->io_edgetrigger);
+}
+
 static void
 xen_pv_set_init_ops(void)
 {
@@ -349,4 +391,6 @@ xen_pv_set_init_ops(void)
 	init_ops = xen_init_ops;
 	/* Disable lapic */
 	lapic_disabled = true;
+	/* IOAPIC ops for Xen PV */
+	ioapic_ops = xen_ioapic_ops;
 }
-- 
1.7.7.5 (Apple Git-26)