linux/drivers/xen/fallback.c
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   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
   8int 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}
  45EXPORT_SYMBOL_GPL(xen_event_channel_op_compat);
  46
  47int HYPERVISOR_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
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