include/linux/lguest.h

   1 /* Things the lguest guest needs to know.  Note: like all lguest interfaces,
   2  * this is subject to wild and random change between versions. */
   3 #ifndef _ASM_LGUEST_H
   4 #define _ASM_LGUEST_H
   5
   6 #ifndef __ASSEMBLY__
   7 #include <asm/irq.h>
   8
   9 #define LHCALL_FLUSH_ASYNC      0
  10 #define LHCALL_LGUEST_INIT      1
  11 #define LHCALL_CRASH            2
  12 #define LHCALL_LOAD_GDT         3
  13 #define LHCALL_NEW_PGTABLE      4
  14 #define LHCALL_FLUSH_TLB        5
  15 #define LHCALL_LOAD_IDT_ENTRY   6
  16 #define LHCALL_SET_STACK        7
  17 #define LHCALL_TS               8
  18 #define LHCALL_SET_CLOCKEVENT   9
  19 #define LHCALL_HALT             10
  20 #define LHCALL_GET_WALLCLOCK    11
  21 #define LHCALL_BIND_DMA         12
  22 #define LHCALL_SEND_DMA         13
  23 #define LHCALL_SET_PTE          14
  24 #define LHCALL_SET_PMD          15
  25 #define LHCALL_LOAD_TLS         16
  26
  27 #define LG_CLOCK_MIN_DELTA      100UL
  28 #define LG_CLOCK_MAX_DELTA      ULONG_MAX
  29
  30 #define LGUEST_TRAP_ENTRY 0x1F
  31
  32 static inline unsigned long
  33 hcall(unsigned long call,
  34       unsigned long arg1, unsigned long arg2, unsigned long arg3)
  35 {
  36         asm volatile("int $" __stringify(LGUEST_TRAP_ENTRY)
  37                      : "=a"(call)
  38                      : "a"(call), "d"(arg1), "b"(arg2), "c"(arg3)
  39                      : "memory");
  40         return call;
  41 }
  42
  43 void async_hcall(unsigned long call,
  44                  unsigned long arg1, unsigned long arg2, unsigned long arg3);
  45
  46 /* Can't use our min() macro here: needs to be a constant */
  47 #define LGUEST_IRQS (NR_IRQS < 32 ? NR_IRQS: 32)
  48
  49 #define LHCALL_RING_SIZE 64
  50 struct hcall_ring
  51 {
  52         u32 eax, edx, ebx, ecx;
  53 };
  54
  55 /* All the good stuff happens here: guest registers it with LGUEST_INIT */
  56 struct lguest_data
  57 {
  58 /* Fields which change during running: */
  59         /* 512 == enabled (same as eflags) */
  60         unsigned int irq_enabled;
  61         /* Interrupts blocked by guest. */
  62         DECLARE_BITMAP(blocked_interrupts, LGUEST_IRQS);
  63
  64         /* Virtual address of page fault. */
  65         unsigned long cr2;
  66
  67         /* Async hypercall ring.  0xFF == done, 0 == pending. */
  68         u8 hcall_status[LHCALL_RING_SIZE];
  69         struct hcall_ring hcalls[LHCALL_RING_SIZE];
  70
  71 /* Fields initialized by the hypervisor at boot: */
  72         /* Memory not to try to access */
  73         unsigned long reserve_mem;
  74         /* ID of this guest (used by network driver to set ethernet address) */
  75         u16 guestid;
  76         /* KHz for the TSC clock. */
  77         u32 tsc_khz;
  78
  79 /* Fields initialized by the guest at boot: */
  80         /* Instruction range to suppress interrupts even if enabled */
  81         unsigned long noirq_start, noirq_end;
  82 };
  83 extern struct lguest_data lguest_data;
  84 #endif /* __ASSEMBLY__ */
  85 #endif  /* _ASM_LGUEST_H */