release/src-rt-6.x.4708/linux/linux-2.6.36/arch/x86/include/asm/xen/interface_32.h

   1 /******************************************************************************
   2  * arch-x86_32.h
   3  *
   4  * Guest OS interface to x86 32-bit Xen.
   5  *
   6  * Copyright (c) 2004, K A Fraser
   7  */
   8
   9 #ifndef _ASM_X86_XEN_INTERFACE_32_H
  10 #define _ASM_X86_XEN_INTERFACE_32_H
  11
  12
  13 /*
  14  * These flat segments are in the Xen-private section of every GDT. Since these
  15  * are also present in the initial GDT, many OSes will be able to avoid
  16  * installing their own GDT.
  17  */
  18 #define FLAT_RING1_CS 0xe019    /* GDT index 259 */
  19 #define FLAT_RING1_DS 0xe021    /* GDT index 260 */
  20 #define FLAT_RING1_SS 0xe021    /* GDT index 260 */
  21 #define FLAT_RING3_CS 0xe02b    /* GDT index 261 */
  22 #define FLAT_RING3_DS 0xe033    /* GDT index 262 */
  23 #define FLAT_RING3_SS 0xe033    /* GDT index 262 */
  24
  25 #define FLAT_KERNEL_CS FLAT_RING1_CS
  26 #define FLAT_KERNEL_DS FLAT_RING1_DS
  27 #define FLAT_KERNEL_SS FLAT_RING1_SS
  28 #define FLAT_USER_CS    FLAT_RING3_CS
  29 #define FLAT_USER_DS    FLAT_RING3_DS
  30 #define FLAT_USER_SS    FLAT_RING3_SS
  31
  32 /* And the trap vector is... */
  33 #define TRAP_INSTR "int $0x82"
  34
  35 /*
  36  * Virtual addresses beyond this are not modifiable by guest OSes. The
  37  * machine->physical mapping table starts at this address, read-only.
  38  */
  39 #define __HYPERVISOR_VIRT_START 0xF5800000
  40
  41 #ifndef __ASSEMBLY__
  42
  43 struct cpu_user_regs {
  44     uint32_t ebx;
  45     uint32_t ecx;
  46     uint32_t edx;
  47     uint32_t esi;
  48     uint32_t edi;
  49     uint32_t ebp;
  50     uint32_t eax;
  51     uint16_t error_code;    /* private */
  52     uint16_t entry_vector;  /* private */
  53     uint32_t eip;
  54     uint16_t cs;
  55     uint8_t  saved_upcall_mask;
  56     uint8_t  _pad0;
  57     uint32_t eflags;        /* eflags.IF == !saved_upcall_mask */
  58     uint32_t esp;
  59     uint16_t ss, _pad1;
  60     uint16_t es, _pad2;
  61     uint16_t ds, _pad3;
  62     uint16_t fs, _pad4;
  63     uint16_t gs, _pad5;
  64 };
  65 DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
  66
  67 typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */
  68
  69 struct arch_vcpu_info {
  70     unsigned long cr2;
  71     unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */
  72 };
  73
  74 struct xen_callback {
  75         unsigned long cs;
  76         unsigned long eip;
  77 };
  78 typedef struct xen_callback xen_callback_t;
  79
  80 #define XEN_CALLBACK(__cs, __eip)                               \
  81         ((struct xen_callback){ .cs = (__cs), .eip = (unsigned long)(__eip) })
  82 #endif /* !__ASSEMBLY__ */
  83
  84
  85 /*
  86  * Page-directory addresses above 4GB do not fit into architectural %cr3.
  87  * When accessing %cr3, or equivalent field in vcpu_guest_context, guests
  88  * must use the following accessor macros to pack/unpack valid MFNs.
  89  *
  90  * Note that Xen is using the fact that the pagetable base is always
  91  * page-aligned, and putting the 12 MSB of the address into the 12 LSB
  92  * of cr3.
  93  */
  94 #define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20))
  95 #define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20))
  96
  97 #endif /* _ASM_X86_XEN_INTERFACE_32_H */