drivers/xen/fallback.c

   1 #include <linux/kernel.h>
   2 #include <linux/string.h>
   3 #include <linux/bug.h>
   4 #include <linux/export.h>
   5 #include <asm/hypervisor.h>
   6 #include <asm/xen/hypercall.h>
   7
   8 int xen_event_channel_op_compat(int cmd, void *arg)
   9 {
  10         struct evtchn_op op;
  11         int rc;
  12
  13         op.cmd = cmd;
  14         memcpy(&op.u, arg, sizeof(op.u));
  15         rc = _hypercall1(int, event_channel_op_compat, &op);
  16
  17         switch (cmd) {
  18         case EVTCHNOP_close:
  19         case EVTCHNOP_send:
  20         case EVTCHNOP_bind_vcpu:
  21         case EVTCHNOP_unmask:
  22                 /* no output */
  23                 break;
  24
  25 #define COPY_BACK(eop) \
  26         case EVTCHNOP_##eop: \
  27                 memcpy(arg, &op.u.eop, sizeof(op.u.eop)); \
  28                 break
  29
  30         COPY_BACK(bind_interdomain);
  31         COPY_BACK(bind_virq);
  32         COPY_BACK(bind_pirq);
  33         COPY_BACK(status);
  34         COPY_BACK(alloc_unbound);
  35         COPY_BACK(bind_ipi);
  36 #undef COPY_BACK
  37
  38         default:
  39                 WARN_ON(rc != -ENOSYS);
  40                 break;
  41         }
  42
  43         return rc;
  44 }
  45 EXPORT_SYMBOL_GPL(xen_event_channel_op_compat);
  46
  47 int xen_physdev_op_compat(int cmd, void *arg)
  48 {
  49         struct physdev_op op;
  50         int rc;
  51
  52         op.cmd = cmd;
  53         memcpy(&op.u, arg, sizeof(op.u));
  54         rc = _hypercall1(int, physdev_op_compat, &op);
  55
  56         switch (cmd) {
  57         case PHYSDEVOP_IRQ_UNMASK_NOTIFY:
  58         case PHYSDEVOP_set_iopl:
  59         case PHYSDEVOP_set_iobitmap:
  60         case PHYSDEVOP_apic_write:
  61                 /* no output */
  62                 break;
  63
  64 #define COPY_BACK(pop, fld) \
  65         case PHYSDEVOP_##pop: \
  66                 memcpy(arg, &op.u.fld, sizeof(op.u.fld)); \
  67                 break
  68
  69         COPY_BACK(irq_status_query, irq_status_query);
  70         COPY_BACK(apic_read, apic_op);
  71         COPY_BACK(ASSIGN_VECTOR, irq_op);
  72 #undef COPY_BACK
  73
  74         default:
  75                 WARN_ON(rc != -ENOSYS);
  76                 break;
  77         }
  78
  79         return rc;
  80 }
  81 EXPORT_SYMBOL_GPL(xen_physdev_op_compat);