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Subject[PATCH 30 of 38] xen: implement io_apic_ops
Date
From
Writes to the IO APIC are paravirtualized via hypercalls, so implement
the appropriate operations.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
arch/x86/xen/Makefile | 3 +-
arch/x86/xen/apic.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++
arch/x86/xen/enlighten.c | 2 +
arch/x86/xen/xen-ops.h | 2 +
4 files changed, 72 insertions(+), 1 deletion(-)

diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -9,4 +9,5 @@
time.o xen-asm_$(BITS).o grant-table.o suspend.o

obj-$(CONFIG_SMP) += smp.o spinlock.o
-obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
\ No newline at end of file
+obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
+obj-$(CONFIG_XEN_DOM0) += apic.o
diff --git a/arch/x86/xen/apic.c b/arch/x86/xen/apic.c
new file mode 100644
--- /dev/null
+++ b/arch/x86/xen/apic.c
@@ -0,0 +1,66 @@
+#include <linux/kernel.h>
+#include <linux/threads.h>
+#include <linux/bitmap.h>
+
+#include <asm/io_apic.h>
+#include <asm/acpi.h>
+
+#include <asm/xen/hypervisor.h>
+#include <asm/xen/hypercall.h>
+
+#include <xen/interface/xen.h>
+#include <xen/interface/physdev.h>
+
+static void __init xen_io_apic_init(void)
+{
+ printk("xen apic init\n");
+ dump_stack();
+}
+
+static unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
+{
+ struct physdev_apic apic_op;
+ int ret;
+
+ apic_op.apic_physbase = mp_ioapics[apic].mp_apicaddr;
+ apic_op.reg = reg;
+ ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
+ if (ret)
+ BUG();
+ return apic_op.value;
+}
+
+
+static void xen_io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
+{
+ struct physdev_apic apic_op;
+
+ apic_op.apic_physbase = mp_ioapics[apic].mp_apicaddr;
+ apic_op.reg = reg;
+ apic_op.value = value;
+ if (HYPERVISOR_physdev_op(PHYSDEVOP_apic_write, &apic_op))
+ BUG();
+}
+
+static struct io_apic_ops __initdata xen_ioapic_ops = {
+ .init = xen_io_apic_init,
+ .read = xen_io_apic_read,
+ .write = xen_io_apic_write,
+ .modify = xen_io_apic_write,
+};
+
+void xen_init_apic(void)
+{
+ if (!xen_initial_domain())
+ return;
+
+ set_io_apic_ops(&xen_ioapic_ops);
+
+#ifdef CONFIG_ACPI
+ /*
+ * Pretend ACPI found our lapic even though we've disabled it,
+ * to prevent MP tables from setting up lapics.
+ */
+ acpi_lapic = 1;
+#endif
+}
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1750,6 +1750,8 @@
set_iopl.iopl = 1;
if (HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl) == -1)
BUG();
+
+ xen_init_apic();
}

/* set the limit of our address space */
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -64,6 +64,8 @@
#endif


+void xen_init_apic(void);
+
/* Declare an asm function, along with symbols needed to make it
inlineable */
#define DECL_ASM(ret, name, ...) \



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