The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/xen/interface/arch-x86/xen-x86_64.h

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    1 /******************************************************************************
    2  * xen-x86_64.h
    3  * 
    4  * Guest OS interface to x86 64-bit Xen.
    5  * 
    6  * Permission is hereby granted, free of charge, to any person obtaining a copy
    7  * of this software and associated documentation files (the "Software"), to
    8  * deal in the Software without restriction, including without limitation the
    9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   10  * sell copies of the Software, and to permit persons to whom the Software is
   11  * furnished to do so, subject to the following conditions:
   12  *
   13  * The above copyright notice and this permission notice shall be included in
   14  * all copies or substantial portions of the Software.
   15  *
   16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   22  * DEALINGS IN THE SOFTWARE.
   23  *
   24  * Copyright (c) 2004-2006, K A Fraser
   25  */
   26 
   27 #ifndef __XEN_PUBLIC_ARCH_X86_XEN_X86_64_H__
   28 #define __XEN_PUBLIC_ARCH_X86_XEN_X86_64_H__
   29 
   30 /*
   31  * Hypercall interface:
   32  *  Input:  %rdi, %rsi, %rdx, %r10, %r8, %r9 (arguments 1-6)
   33  *  Output: %rax
   34  * Access is via hypercall page (set up by guest loader or via a Xen MSR):
   35  *  call hypercall_page + hypercall-number * 32
   36  * Clobbered: argument registers (e.g., 2-arg hypercall clobbers %rdi,%rsi)
   37  */
   38 
   39 /*
   40  * 64-bit segment selectors
   41  * These flat segments are in the Xen-private section of every GDT. Since these
   42  * are also present in the initial GDT, many OSes will be able to avoid
   43  * installing their own GDT.
   44  */
   45 
   46 #define FLAT_RING3_CS32 0xe023  /* GDT index 260 */
   47 #define FLAT_RING3_CS64 0xe033  /* GDT index 261 */
   48 #define FLAT_RING3_DS32 0xe02b  /* GDT index 262 */
   49 #define FLAT_RING3_DS64 0x0000  /* NULL selector */
   50 #define FLAT_RING3_SS32 0xe02b  /* GDT index 262 */
   51 #define FLAT_RING3_SS64 0xe02b  /* GDT index 262 */
   52 
   53 #define FLAT_KERNEL_DS64 FLAT_RING3_DS64
   54 #define FLAT_KERNEL_DS32 FLAT_RING3_DS32
   55 #define FLAT_KERNEL_DS   FLAT_KERNEL_DS64
   56 #define FLAT_KERNEL_CS64 FLAT_RING3_CS64
   57 #define FLAT_KERNEL_CS32 FLAT_RING3_CS32
   58 #define FLAT_KERNEL_CS   FLAT_KERNEL_CS64
   59 #define FLAT_KERNEL_SS64 FLAT_RING3_SS64
   60 #define FLAT_KERNEL_SS32 FLAT_RING3_SS32
   61 #define FLAT_KERNEL_SS   FLAT_KERNEL_SS64
   62 
   63 #define FLAT_USER_DS64 FLAT_RING3_DS64
   64 #define FLAT_USER_DS32 FLAT_RING3_DS32
   65 #define FLAT_USER_DS   FLAT_USER_DS64
   66 #define FLAT_USER_CS64 FLAT_RING3_CS64
   67 #define FLAT_USER_CS32 FLAT_RING3_CS32
   68 #define FLAT_USER_CS   FLAT_USER_CS64
   69 #define FLAT_USER_SS64 FLAT_RING3_SS64
   70 #define FLAT_USER_SS32 FLAT_RING3_SS32
   71 #define FLAT_USER_SS   FLAT_USER_SS64
   72 
   73 #define __HYPERVISOR_VIRT_START 0xFFFF800000000000
   74 #define __HYPERVISOR_VIRT_END   0xFFFF880000000000
   75 #define __MACH2PHYS_VIRT_START  0xFFFF800000000000
   76 #define __MACH2PHYS_VIRT_END    0xFFFF804000000000
   77 
   78 #ifndef HYPERVISOR_VIRT_START
   79 #define HYPERVISOR_VIRT_START mk_unsigned_long(__HYPERVISOR_VIRT_START)
   80 #define HYPERVISOR_VIRT_END   mk_unsigned_long(__HYPERVISOR_VIRT_END)
   81 #endif
   82 
   83 #define MACH2PHYS_VIRT_START  mk_unsigned_long(__MACH2PHYS_VIRT_START)
   84 #define MACH2PHYS_VIRT_END    mk_unsigned_long(__MACH2PHYS_VIRT_END)
   85 #define MACH2PHYS_NR_ENTRIES  ((MACH2PHYS_VIRT_END-MACH2PHYS_VIRT_START)>>3)
   86 #ifndef machine_to_phys_mapping
   87 #define machine_to_phys_mapping ((unsigned long *)HYPERVISOR_VIRT_START)
   88 #endif
   89 
   90 /*
   91  * int HYPERVISOR_set_segment_base(unsigned int which, unsigned long base)
   92  *  @which == SEGBASE_*  ;  @base == 64-bit base address
   93  * Returns 0 on success.
   94  */
   95 #define SEGBASE_FS          0
   96 #define SEGBASE_GS_USER     1
   97 #define SEGBASE_GS_KERNEL   2
   98 #define SEGBASE_GS_USER_SEL 3 /* Set user %gs specified in base[15:0] */
   99 
  100 /*
  101  * int HYPERVISOR_iret(void)
  102  * All arguments are on the kernel stack, in the following format.
  103  * Never returns if successful. Current kernel context is lost.
  104  * The saved CS is mapped as follows:
  105  *   RING0 -> RING3 kernel mode.
  106  *   RING1 -> RING3 kernel mode.
  107  *   RING2 -> RING3 kernel mode.
  108  *   RING3 -> RING3 user mode.
  109  * However RING0 indicates that the guest kernel should return to iteself
  110  * directly with
  111  *      orb   $3,1*8(%rsp)
  112  *      iretq
  113  * If flags contains VGCF_in_syscall:
  114  *   Restore RAX, RIP, RFLAGS, RSP.
  115  *   Discard R11, RCX, CS, SS.
  116  * Otherwise:
  117  *   Restore RAX, R11, RCX, CS:RIP, RFLAGS, SS:RSP.
  118  * All other registers are saved on hypercall entry and restored to user.
  119  */
  120 /* Guest exited in SYSCALL context? Return to guest with SYSRET? */
  121 #define _VGCF_in_syscall 8
  122 #define VGCF_in_syscall  (1<<_VGCF_in_syscall)
  123 #define VGCF_IN_SYSCALL  VGCF_in_syscall
  124 
  125 #ifndef __ASSEMBLY__
  126 
  127 struct iret_context {
  128     /* Top of stack (%rsp at point of hypercall). */
  129     uint64_t rax, r11, rcx, flags, rip, cs, rflags, rsp, ss;
  130     /* Bottom of iret stack frame. */
  131 };
  132 
  133 #if defined(__GNUC__) && !defined(__STRICT_ANSI__)
  134 /* Anonymous union includes both 32- and 64-bit names (e.g., eax/rax). */
  135 #define __DECL_REG(name) union { \
  136     uint64_t r ## name, e ## name; \
  137     uint32_t _e ## name; \
  138 }
  139 #else
  140 /* Non-gcc sources must always use the proper 64-bit name (e.g., rax). */
  141 #define __DECL_REG(name) uint64_t r ## name
  142 #endif
  143 
  144 struct cpu_user_regs {
  145     uint64_t r15;
  146     uint64_t r14;
  147     uint64_t r13;
  148     uint64_t r12;
  149     __DECL_REG(bp);
  150     __DECL_REG(bx);
  151     uint64_t r11;
  152     uint64_t r10;
  153     uint64_t r9;
  154     uint64_t r8;
  155     __DECL_REG(ax);
  156     __DECL_REG(cx);
  157     __DECL_REG(dx);
  158     __DECL_REG(si);
  159     __DECL_REG(di);
  160     uint32_t error_code;    /* private */
  161     uint32_t entry_vector;  /* private */
  162     __DECL_REG(ip);
  163     uint16_t cs, _pad0[1];
  164     uint8_t  saved_upcall_mask;
  165     uint8_t  _pad1[3];
  166     __DECL_REG(flags);      /* rflags.IF == !saved_upcall_mask */
  167     __DECL_REG(sp);
  168     uint16_t ss, _pad2[3];
  169     uint16_t es, _pad3[3];
  170     uint16_t ds, _pad4[3];
  171     uint16_t fs, _pad5[3]; /* Non-zero => takes precedence over fs_base.     */
  172     uint16_t gs, _pad6[3]; /* Non-zero => takes precedence over gs_base_usr. */
  173 };
  174 typedef struct cpu_user_regs cpu_user_regs_t;
  175 DEFINE_XEN_GUEST_HANDLE(cpu_user_regs_t);
  176 
  177 #undef __DECL_REG
  178 
  179 #define xen_pfn_to_cr3(pfn) ((unsigned long)(pfn) << 12)
  180 #define xen_cr3_to_pfn(cr3) ((unsigned long)(cr3) >> 12)
  181 
  182 struct arch_vcpu_info {
  183     unsigned long cr2;
  184     unsigned long pad; /* sizeof(vcpu_info_t) == 64 */
  185 };
  186 typedef struct arch_vcpu_info arch_vcpu_info_t;
  187 
  188 typedef unsigned long xen_callback_t;
  189 
  190 #endif /* !__ASSEMBLY__ */
  191 
  192 #endif /* __XEN_PUBLIC_ARCH_X86_XEN_X86_64_H__ */
  193 
  194 /*
  195  * Local variables:
  196  * mode: C
  197  * c-file-style: "BSD"
  198  * c-basic-offset: 4
  199  * tab-width: 4
  200  * indent-tabs-mode: nil
  201  * End:
  202  */

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