LXR linux/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 _LINUX_LGUEST_H
   4#define _LINUX_LGUEST_H
   5
   6#ifndef __ASSEMBLY__
   7#include <linux/time.h>
   8#include <asm/irq.h>
   9#include <asm/lguest_hcall.h>
  10
  11#define LG_CLOCK_MIN_DELTA      100UL
  12#define LG_CLOCK_MAX_DELTA      ULONG_MAX
  13
  14/*G:032 The second method of communicating with the Host is to via "struct
  15 * lguest_data".  Once the Guest's initialization hypercall tells the Host where
  16 * this is, the Guest and Host both publish information in it. :*/
  17struct lguest_data
  18{
  19        /* 512 == enabled (same as eflags in normal hardware).  The Guest
  20         * changes interrupts so often that a hypercall is too slow. */
  21        unsigned int irq_enabled;
  22        /* Fine-grained interrupt disabling by the Guest */
  23        DECLARE_BITMAP(blocked_interrupts, LGUEST_IRQS);
  24
  25        /* The Host writes the virtual address of the last page fault here,
  26         * which saves the Guest a hypercall.  CR2 is the native register where
  27         * this address would normally be found. */
  28        unsigned long cr2;
  29
  30        /* Wallclock time set by the Host. */
  31        struct timespec time;
  32
  33        /* Async hypercall ring.  Instead of directly making hypercalls, we can
  34         * place them in here for processing the next time the Host wants.
  35         * This batching can be quite efficient. */
  36
  37        /* 0xFF == done (set by Host), 0 == pending (set by Guest). */
  38        u8 hcall_status[LHCALL_RING_SIZE];
  39        /* The actual registers for the hypercalls. */
  40        struct hcall_args hcalls[LHCALL_RING_SIZE];
  41
  42/* Fields initialized by the Host at boot: */
  43        /* Memory not to try to access */
  44        unsigned long reserve_mem;
  45        /* KHz for the TSC clock. */
  46        u32 tsc_khz;
  47        /* Page where the top-level pagetable is */
  48        unsigned long pgdir;
  49
  50/* Fields initialized by the Guest at boot: */
  51        /* Instruction range to suppress interrupts even if enabled */
  52        unsigned long noirq_start, noirq_end;
  53        /* Address above which page tables are all identical. */
  54        unsigned long kernel_address;
  55        /* The vector to try to use for system calls (0x40 or 0x80). */
  56        unsigned int syscall_vec;
  57};
  58extern struct lguest_data lguest_data;
  59#endif /* __ASSEMBLY__ */
  60#endif  /* _LINUX_LGUEST_H */
  61