fallback.c
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#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/bug.h>
#include <linux/export.h>
#include <asm/hypervisor.h>
#include <asm/xen/hypercall.h>
int xen_event_channel_op_compat(int cmd, void *arg)
{
struct evtchn_op op;
int rc;
op.cmd = cmd;
memcpy(&op.u, arg, sizeof(op.u));
rc = _hypercall1(int, event_channel_op_compat, &op);
switch (cmd) {
case EVTCHNOP_close:
case EVTCHNOP_send:
case EVTCHNOP_bind_vcpu:
case EVTCHNOP_unmask:
/* no output */
break;
#define COPY_BACK(eop) \
case EVTCHNOP_##eop: \
memcpy(arg, &op.u.eop, sizeof(op.u.eop)); \
break
COPY_BACK(bind_interdomain);
COPY_BACK(bind_virq);
COPY_BACK(bind_pirq);
COPY_BACK(status);
COPY_BACK(alloc_unbound);
COPY_BACK(bind_ipi);
#undef COPY_BACK
default:
WARN_ON(rc != -ENOSYS);
break;
}
return rc;
}
EXPORT_SYMBOL_GPL(xen_event_channel_op_compat);
int xen_physdev_op_compat(int cmd, void *arg)
{
struct physdev_op op;
int rc;
op.cmd = cmd;
memcpy(&op.u, arg, sizeof(op.u));
rc = _hypercall1(int, physdev_op_compat, &op);
switch (cmd) {
case PHYSDEVOP_IRQ_UNMASK_NOTIFY:
case PHYSDEVOP_set_iopl:
case PHYSDEVOP_set_iobitmap:
case PHYSDEVOP_apic_write:
/* no output */
break;
#define COPY_BACK(pop, fld) \
case PHYSDEVOP_##pop: \
memcpy(arg, &op.u.fld, sizeof(op.u.fld)); \
break
COPY_BACK(irq_status_query, irq_status_query);
COPY_BACK(apic_read, apic_op);
COPY_BACK(ASSIGN_VECTOR, irq_op);
#undef COPY_BACK
default:
WARN_ON(rc != -ENOSYS);
break;
}
return rc;
}
EXPORT_SYMBOL_GPL(xen_physdev_op_compat);