LXR linux/arch/x86/include/asm/xen/interface

   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
  49struct 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};
  71DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
  72
  73typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */
  74
  75struct arch_vcpu_info {
  76    unsigned long cr2;
  77    unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */
  78};
  79
  80struct xen_callback {
  81        unsigned long cs;
  82        unsigned long eip;
  83};
  84typedef 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 */
 104