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 #define __MACH2PHYS_VIRT_START 0xF5800000
  36 #define __MACH2PHYS_VIRT_END   0xF6800000
  37
  38 #define __MACH2PHYS_SHIFT      2
  39
  40 /*
  41  * Virtual addresses beyond this are not modifiable by guest OSes. The
  42  * machine->physical mapping table starts at this address, read-only.
  43  */
  44 #define __HYPERVISOR_VIRT_START 0xF5800000
  45
  46 #ifndef __ASSEMBLY__
  47
  48 struct cpu_user_regs {
  49     uint32_t ebx;
  50     uint32_t ecx;
  51     uint32_t edx;
  52     uint32_t esi;
  53     uint32_t edi;
  54     uint32_t ebp;
  55     uint32_t eax;
  56     uint16_t error_code;    /* private */
  57     uint16_t entry_vector;  /* private */
  58     uint32_t eip;
  59     uint16_t cs;
  60     uint8_t  saved_upcall_mask;
  61     uint8_t  _pad0;
  62     uint32_t eflags;        /* eflags.IF == !saved_upcall_mask */
  63     uint32_t esp;
  64     uint16_t ss, _pad1;
  65     uint16_t es, _pad2;
  66     uint16_t ds, _pad3;
  67     uint16_t fs, _pad4;
  68     uint16_t gs, _pad5;
  69 };
  70 DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
  71
  72 typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */
  73
  74 struct arch_vcpu_info {
  75     unsigned long cr2;
  76     unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */
  77 };
  78
  79 struct xen_callback {
  80         unsigned long cs;
  81         unsigned long eip;
  82 };
  83 typedef struct xen_callback xen_callback_t;
  84
  85 #define XEN_CALLBACK(__cs, __eip)                               \
  86         ((struct xen_callback){ .cs = (__cs), .eip = (unsigned long)(__eip) })
  87 #endif /* !__ASSEMBLY__ */
  88
  89
  90 /*
  91  * Page-directory addresses above 4GB do not fit into architectural %cr3.
  92  * When accessing %cr3, or equivalent field in vcpu_guest_context, guests
  93  * must use the following accessor macros to pack/unpack valid MFNs.
  94  *
  95  * Note that Xen is using the fact that the pagetable base is always
  96  * page-aligned, and putting the 12 MSB of the address into the 12 LSB
  97  * of cr3.
  98  */
  99 #define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20))
 100 #define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20))
 101
 102 #endif /* _ASM_X86_XEN_INTERFACE_32_H */