arch/x86/include/asm/xen/interface_32.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /******************************************************************************
   3  * arch-x86_32.h
   4  *
   5  * Guest OS interface to x86 32-bit Xen.
   6  *
   7  * Copyright (c) 2004, K A Fraser
   8  */
   9
  10 #ifndef _ASM_X86_XEN_INTERFACE_32_H
  11 #define _ASM_X86_XEN_INTERFACE_32_H
  12
  13
  14 /*
  15  * These flat segments are in the Xen-private section of every GDT. Since these
  16  * are also present in the initial GDT, many OSes will be able to avoid
  17  * installing their own GDT.
  18  */
  19 #define FLAT_RING1_CS 0xe019    /* GDT index 259 */
  20 #define FLAT_RING1_DS 0xe021    /* GDT index 260 */
  21 #define FLAT_RING1_SS 0xe021    /* GDT index 260 */
  22 #define FLAT_RING3_CS 0xe02b    /* GDT index 261 */
  23 #define FLAT_RING3_DS 0xe033    /* GDT index 262 */
  24 #define FLAT_RING3_SS 0xe033    /* GDT index 262 */
  25
  26 #define FLAT_KERNEL_CS FLAT_RING1_CS
  27 #define FLAT_KERNEL_DS FLAT_RING1_DS
  28 #define FLAT_KERNEL_SS FLAT_RING1_SS
  29 #define FLAT_USER_CS    FLAT_RING3_CS
  30 #define FLAT_USER_DS    FLAT_RING3_DS
  31 #define FLAT_USER_SS    FLAT_RING3_SS
  32
  33 /* And the trap vector is... */
  34 #define TRAP_INSTR "int $0x82"
  35
  36 #define __MACH2PHYS_VIRT_START 0xF5800000
  37 #define __MACH2PHYS_VIRT_END   0xF6800000
  38
  39 #define __MACH2PHYS_SHIFT      2
  40
  41 /*
  42  * Virtual addresses beyond this are not modifiable by guest OSes. The
  43  * machine->physical mapping table starts at this address, read-only.
  44  */
  45 #define __HYPERVISOR_VIRT_START 0xF5800000
  46
  47 #ifndef __ASSEMBLY__
  48
  49 struct cpu_user_regs {
  50     uint32_t ebx;
  51     uint32_t ecx;
  52     uint32_t edx;
  53     uint32_t esi;
  54     uint32_t edi;
  55     uint32_t ebp;
  56     uint32_t eax;
  57     uint16_t error_code;    /* private */
  58     uint16_t entry_vector;  /* private */
  59     uint32_t eip;
  60     uint16_t cs;
  61     uint8_t  saved_upcall_mask;
  62     uint8_t  _pad0;
  63     uint32_t eflags;        /* eflags.IF == !saved_upcall_mask */
  64     uint32_t esp;
  65     uint16_t ss, _pad1;
  66     uint16_t es, _pad2;
  67     uint16_t ds, _pad3;
  68     uint16_t fs, _pad4;
  69     uint16_t gs, _pad5;
  70 };
  71 DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
  72
  73 typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */
  74
  75 struct arch_vcpu_info {
  76     unsigned long cr2;
  77     unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */
  78 };
  79
  80 struct xen_callback {
  81         unsigned long cs;
  82         unsigned long eip;
  83 };
  84 typedef struct xen_callback xen_callback_t;
  85
  86 #define XEN_CALLBACK(__cs, __eip)                               \
  87         ((struct xen_callback){ .cs = (__cs), .eip = (unsigned long)(__eip) })
  88 #endif /* !__ASSEMBLY__ */
  89
  90
  91 /*
  92  * Page-directory addresses above 4GB do not fit into architectural %cr3.
  93  * When accessing %cr3, or equivalent field in vcpu_guest_context, guests
  94  * must use the following accessor macros to pack/unpack valid MFNs.
  95  *
  96  * Note that Xen is using the fact that the pagetable base is always
  97  * page-aligned, and putting the 12 MSB of the address into the 12 LSB
  98  * of cr3.
  99  */
 100 #define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20))
 101 #define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20))
 102
 103 #endif /* _ASM_X86_XEN_INTERFACE_32_H */