/* Architecture specific portion of the lguest hypercalls */

  #ifndef _ASM_X86_LGUEST_HCALL_H
  #define _ASM_X86_LGUEST_HCALL_H

  
  #define LHCALL_FLUSH_ASYNC	0
  #define LHCALL_LGUEST_INIT	1

  #define LHCALL_SHUTDOWN		2

  #define LHCALL_NEW_PGTABLE	4
  #define LHCALL_FLUSH_TLB	5
  #define LHCALL_LOAD_IDT_ENTRY	6
  #define LHCALL_SET_STACK	7
  #define LHCALL_TS		8
  #define LHCALL_SET_CLOCKEVENT	9
  #define LHCALL_HALT		10

  #define LHCALL_SET_PMD		13

  #define LHCALL_SET_PTE		14

  #define LHCALL_SET_PGD		15

  #define LHCALL_LOAD_TLS		16

  #define LHCALL_NOTIFY		17

  #define LHCALL_LOAD_GDT_ENTRY	18

  #define LHCALL_SEND_INTERRUPTS	19

  #define LGUEST_TRAP_ENTRY 0x1F

  /* Argument number 3 to LHCALL_LGUEST_SHUTDOWN */
  #define LGUEST_SHUTDOWN_POWEROFF	1
  #define LGUEST_SHUTDOWN_RESTART		2

  #ifndef __ASSEMBLY__
  #include <asm/hw_irq.h>

  /*G:030
   * But first, how does our Guest contact the Host to ask for privileged

   * operations?  There are two ways: the direct way is to make a "hypercall",
   * to make requests of the Host Itself.
   *

   * Our hypercall mechanism uses the highest unused trap code (traps 32 and
   * above are used by real hardware interrupts).  Seventeen hypercalls are
   * available: the hypercall number is put in the %eax register, and the
   * arguments (when required) are placed in %ebx, %ecx, %edx and %esi.
   * If a return value makes sense, it's returned in %eax.

   *
   * Grossly invalid calls result in Sudden Death at the hands of the vengeful
   * Host, rather than returning failure.  This reflects Winston Churchill's

   * definition of a gentleman: "someone who is only rude intentionally".

   */
  static inline unsigned long
  hcall(unsigned long call,
        unsigned long arg1, unsigned long arg2, unsigned long arg3,
        unsigned long arg4)
  {
  	/* "int" is the Intel instruction to trigger a trap. */
  	asm volatile("int $" __stringify(LGUEST_TRAP_ENTRY)
  		     /* The call in %eax (aka "a") might be overwritten */
  		     : "=a"(call)
  		       /* The arguments are in %eax, %ebx, %ecx, %edx & %esi */
  		     : "a"(call), "b"(arg1), "c"(arg2), "d"(arg3), "S"(arg4)
  		       /* "memory" means this might write somewhere in memory.
  			* This isn't true for all calls, but it's safe to tell
  			* gcc that it might happen so it doesn't get clever. */
  		     : "memory");
  	return call;
  }

  /*:*/

  /* Can't use our min() macro here: needs to be a constant */
  #define LGUEST_IRQS (NR_IRQS < 32 ? NR_IRQS: 32)
  
  #define LHCALL_RING_SIZE 64

  struct hcall_args {

  	/* These map directly onto eax/ebx/ecx/edx/esi in struct lguest_regs */

  	unsigned long arg0, arg1, arg2, arg3, arg4;

  };

  
  #endif /* !__ASSEMBLY__ */

  #endif /* _ASM_X86_LGUEST_HCALL_H */