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/arch/x86/include/asm/xen/interface_64.h

https://gitlab.com/Team-OSE-old/SimpleKernel
C Header | 148 lines | 93 code | 19 blank | 36 comment | 1 complexity | 607c832d667b0a35bc09134409900b3f MD5 | raw file
  1#ifndef _ASM_X86_XEN_INTERFACE_64_H
  2#define _ASM_X86_XEN_INTERFACE_64_H
  3
  4/*
  5 * 64-bit segment selectors
  6 * These flat segments are in the Xen-private section of every GDT. Since these
  7 * are also present in the initial GDT, many OSes will be able to avoid
  8 * installing their own GDT.
  9 */
 10
 11#define FLAT_RING3_CS32 0xe023  /* GDT index 260 */
 12#define FLAT_RING3_CS64 0xe033  /* GDT index 261 */
 13#define FLAT_RING3_DS32 0xe02b  /* GDT index 262 */
 14#define FLAT_RING3_DS64 0x0000  /* NULL selector */
 15#define FLAT_RING3_SS32 0xe02b  /* GDT index 262 */
 16#define FLAT_RING3_SS64 0xe02b  /* GDT index 262 */
 17
 18#define FLAT_KERNEL_DS64 FLAT_RING3_DS64
 19#define FLAT_KERNEL_DS32 FLAT_RING3_DS32
 20#define FLAT_KERNEL_DS   FLAT_KERNEL_DS64
 21#define FLAT_KERNEL_CS64 FLAT_RING3_CS64
 22#define FLAT_KERNEL_CS32 FLAT_RING3_CS32
 23#define FLAT_KERNEL_CS   FLAT_KERNEL_CS64
 24#define FLAT_KERNEL_SS64 FLAT_RING3_SS64
 25#define FLAT_KERNEL_SS32 FLAT_RING3_SS32
 26#define FLAT_KERNEL_SS   FLAT_KERNEL_SS64
 27
 28#define FLAT_USER_DS64 FLAT_RING3_DS64
 29#define FLAT_USER_DS32 FLAT_RING3_DS32
 30#define FLAT_USER_DS   FLAT_USER_DS64
 31#define FLAT_USER_CS64 FLAT_RING3_CS64
 32#define FLAT_USER_CS32 FLAT_RING3_CS32
 33#define FLAT_USER_CS   FLAT_USER_CS64
 34#define FLAT_USER_SS64 FLAT_RING3_SS64
 35#define FLAT_USER_SS32 FLAT_RING3_SS32
 36#define FLAT_USER_SS   FLAT_USER_SS64
 37
 38#define __HYPERVISOR_VIRT_START 0xFFFF800000000000
 39#define __HYPERVISOR_VIRT_END   0xFFFF880000000000
 40#define __MACH2PHYS_VIRT_START  0xFFFF800000000000
 41#define __MACH2PHYS_VIRT_END    0xFFFF804000000000
 42#define __MACH2PHYS_SHIFT       3
 43
 44/*
 45 * int HYPERVISOR_set_segment_base(unsigned int which, unsigned long base)
 46 *  @which == SEGBASE_*  ;  @base == 64-bit base address
 47 * Returns 0 on success.
 48 */
 49#define SEGBASE_FS          0
 50#define SEGBASE_GS_USER     1
 51#define SEGBASE_GS_KERNEL   2
 52#define SEGBASE_GS_USER_SEL 3 /* Set user %gs specified in base[15:0] */
 53
 54/*
 55 * int HYPERVISOR_iret(void)
 56 * All arguments are on the kernel stack, in the following format.
 57 * Never returns if successful. Current kernel context is lost.
 58 * The saved CS is mapped as follows:
 59 *   RING0 -> RING3 kernel mode.
 60 *   RING1 -> RING3 kernel mode.
 61 *   RING2 -> RING3 kernel mode.
 62 *   RING3 -> RING3 user mode.
 63 * However RING0 indicates that the guest kernel should return to iteself
 64 * directly with
 65 *      orb   $3,1*8(%rsp)
 66 *      iretq
 67 * If flags contains VGCF_in_syscall:
 68 *   Restore RAX, RIP, RFLAGS, RSP.
 69 *   Discard R11, RCX, CS, SS.
 70 * Otherwise:
 71 *   Restore RAX, R11, RCX, CS:RIP, RFLAGS, SS:RSP.
 72 * All other registers are saved on hypercall entry and restored to user.
 73 */
 74/* Guest exited in SYSCALL context? Return to guest with SYSRET? */
 75#define _VGCF_in_syscall 8
 76#define VGCF_in_syscall  (1<<_VGCF_in_syscall)
 77#define VGCF_IN_SYSCALL  VGCF_in_syscall
 78
 79#ifndef __ASSEMBLY__
 80
 81struct iret_context {
 82    /* Top of stack (%rsp at point of hypercall). */
 83    uint64_t rax, r11, rcx, flags, rip, cs, rflags, rsp, ss;
 84    /* Bottom of iret stack frame. */
 85};
 86
 87#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
 88/* Anonymous union includes both 32- and 64-bit names (e.g., eax/rax). */
 89#define __DECL_REG(name) union { \
 90    uint64_t r ## name, e ## name; \
 91    uint32_t _e ## name; \
 92}
 93#else
 94/* Non-gcc sources must always use the proper 64-bit name (e.g., rax). */
 95#define __DECL_REG(name) uint64_t r ## name
 96#endif
 97
 98struct cpu_user_regs {
 99    uint64_t r15;
100    uint64_t r14;
101    uint64_t r13;
102    uint64_t r12;
103    __DECL_REG(bp);
104    __DECL_REG(bx);
105    uint64_t r11;
106    uint64_t r10;
107    uint64_t r9;
108    uint64_t r8;
109    __DECL_REG(ax);
110    __DECL_REG(cx);
111    __DECL_REG(dx);
112    __DECL_REG(si);
113    __DECL_REG(di);
114    uint32_t error_code;    /* private */
115    uint32_t entry_vector;  /* private */
116    __DECL_REG(ip);
117    uint16_t cs, _pad0[1];
118    uint8_t  saved_upcall_mask;
119    uint8_t  _pad1[3];
120    __DECL_REG(flags);      /* rflags.IF == !saved_upcall_mask */
121    __DECL_REG(sp);
122    uint16_t ss, _pad2[3];
123    uint16_t es, _pad3[3];
124    uint16_t ds, _pad4[3];
125    uint16_t fs, _pad5[3]; /* Non-zero => takes precedence over fs_base.     */
126    uint16_t gs, _pad6[3]; /* Non-zero => takes precedence over gs_base_usr. */
127};
128DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
129
130#undef __DECL_REG
131
132#define xen_pfn_to_cr3(pfn) ((unsigned long)(pfn) << 12)
133#define xen_cr3_to_pfn(cr3) ((unsigned long)(cr3) >> 12)
134
135struct arch_vcpu_info {
136    unsigned long cr2;
137    unsigned long pad; /* sizeof(vcpu_info_t) == 64 */
138};
139
140typedef unsigned long xen_callback_t;
141
142#define XEN_CALLBACK(__cs, __rip)				\
143	((unsigned long)(__rip))
144
145#endif /* !__ASSEMBLY__ */
146
147
148#endif /* _ASM_X86_XEN_INTERFACE_64_H */