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.h

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    1 /******************************************************************************
    2  * arch-x86/xen.h
    3  * 
    4  * Guest OS interface to x86 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 #include "../xen.h"
   28 
   29 #ifndef __XEN_PUBLIC_ARCH_X86_XEN_H__
   30 #define __XEN_PUBLIC_ARCH_X86_XEN_H__
   31 
   32 /* Structural guest handles introduced in 0x00030201. */
   33 #if __XEN_INTERFACE_VERSION__ >= 0x00030201
   34 #define ___DEFINE_XEN_GUEST_HANDLE(name, type) \
   35     typedef struct { type *p; } __guest_handle_ ## name
   36 #else
   37 #define ___DEFINE_XEN_GUEST_HANDLE(name, type) \
   38     typedef type * __guest_handle_ ## name
   39 #endif
   40 
   41 #define __DEFINE_XEN_GUEST_HANDLE(name, type) \
   42     ___DEFINE_XEN_GUEST_HANDLE(name, type);   \
   43     ___DEFINE_XEN_GUEST_HANDLE(const_##name, const type)
   44 #define DEFINE_XEN_GUEST_HANDLE(name)   __DEFINE_XEN_GUEST_HANDLE(name, name)
   45 #define __XEN_GUEST_HANDLE(name)        __guest_handle_ ## name
   46 #define XEN_GUEST_HANDLE(name)          __XEN_GUEST_HANDLE(name)
   47 #define set_xen_guest_handle_raw(hnd, val)  do { (hnd).p = val; } while (0)
   48 #ifdef __XEN_TOOLS__
   49 #define get_xen_guest_handle(val, hnd)  do { val = (hnd).p; } while (0)
   50 #endif
   51 #define set_xen_guest_handle(hnd, val) set_xen_guest_handle_raw(hnd, val)
   52 
   53 #if defined(__i386__)
   54 #include "xen-x86_32.h"
   55 #elif defined(__x86_64__)
   56 #include "xen-x86_64.h"
   57 #endif
   58 
   59 #ifndef __ASSEMBLY__
   60 typedef unsigned long xen_pfn_t;
   61 #define PRI_xen_pfn "lx"
   62 #endif
   63 
   64 /*
   65  * SEGMENT DESCRIPTOR TABLES
   66  */
   67 /*
   68  * ` enum neg_errnoval
   69  * ` HYPERVISOR_set_gdt(const xen_pfn_t frames[], unsigned int entries);
   70  * `
   71  */
   72 /*
   73  * A number of GDT entries are reserved by Xen. These are not situated at the
   74  * start of the GDT because some stupid OSes export hard-coded selector values
   75  * in their ABI. These hard-coded values are always near the start of the GDT,
   76  * so Xen places itself out of the way, at the far end of the GDT.
   77  */
   78 #define FIRST_RESERVED_GDT_PAGE  14
   79 #define FIRST_RESERVED_GDT_BYTE  (FIRST_RESERVED_GDT_PAGE * 4096)
   80 #define FIRST_RESERVED_GDT_ENTRY (FIRST_RESERVED_GDT_BYTE / 8)
   81 
   82 /* Maximum number of virtual CPUs in legacy multi-processor guests. */
   83 #define XEN_LEGACY_MAX_VCPUS 32
   84 
   85 #ifndef __ASSEMBLY__
   86 
   87 typedef unsigned long xen_ulong_t;
   88 
   89 /*
   90  * ` enum neg_errnoval
   91  * ` HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp);
   92  * `
   93  * Sets the stack segment and pointer for the current vcpu.
   94  */
   95 
   96 /*
   97  * ` enum neg_errnoval
   98  * ` HYPERVISOR_set_trap_table(const struct trap_info traps[]);
   99  * `
  100  */
  101 /*
  102  * Send an array of these to HYPERVISOR_set_trap_table().
  103  * Terminate the array with a sentinel entry, with traps[].address==0.
  104  * The privilege level specifies which modes may enter a trap via a software
  105  * interrupt. On x86/64, since rings 1 and 2 are unavailable, we allocate
  106  * privilege levels as follows:
  107  *  Level == 0: Noone may enter
  108  *  Level == 1: Kernel may enter
  109  *  Level == 2: Kernel may enter
  110  *  Level == 3: Everyone may enter
  111  */
  112 #define TI_GET_DPL(_ti)      ((_ti)->flags & 3)
  113 #define TI_GET_IF(_ti)       ((_ti)->flags & 4)
  114 #define TI_SET_DPL(_ti,_dpl) ((_ti)->flags |= (_dpl))
  115 #define TI_SET_IF(_ti,_if)   ((_ti)->flags |= ((!!(_if))<<2))
  116 struct trap_info {
  117     uint8_t       vector;  /* exception vector                              */
  118     uint8_t       flags;   /* 0-3: privilege level; 4: clear event enable?  */
  119     uint16_t      cs;      /* code selector                                 */
  120     unsigned long address; /* code offset                                   */
  121 };
  122 typedef struct trap_info trap_info_t;
  123 DEFINE_XEN_GUEST_HANDLE(trap_info_t);
  124 
  125 typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */
  126 
  127 /*
  128  * The following is all CPU context. Note that the fpu_ctxt block is filled 
  129  * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used.
  130  */
  131 struct vcpu_guest_context {
  132     /* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */
  133     struct { char x[512]; } fpu_ctxt;       /* User-level FPU registers     */
  134 #define VGCF_I387_VALID                (1<<0)
  135 #define VGCF_IN_KERNEL                 (1<<2)
  136 #define _VGCF_i387_valid               0
  137 #define VGCF_i387_valid                (1<<_VGCF_i387_valid)
  138 #define _VGCF_in_kernel                2
  139 #define VGCF_in_kernel                 (1<<_VGCF_in_kernel)
  140 #define _VGCF_failsafe_disables_events 3
  141 #define VGCF_failsafe_disables_events  (1<<_VGCF_failsafe_disables_events)
  142 #define _VGCF_syscall_disables_events  4
  143 #define VGCF_syscall_disables_events   (1<<_VGCF_syscall_disables_events)
  144 #define _VGCF_online                   5
  145 #define VGCF_online                    (1<<_VGCF_online)
  146     unsigned long flags;                    /* VGCF_* flags                 */
  147     struct cpu_user_regs user_regs;         /* User-level CPU registers     */
  148     struct trap_info trap_ctxt[256];        /* Virtual IDT                  */
  149     unsigned long ldt_base, ldt_ents;       /* LDT (linear address, # ents) */
  150     unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */
  151     unsigned long kernel_ss, kernel_sp;     /* Virtual TSS (only SS1/SP1)   */
  152     /* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */
  153     unsigned long ctrlreg[8];               /* CR0-CR7 (control registers)  */
  154     unsigned long debugreg[8];              /* DB0-DB7 (debug registers)    */
  155 #ifdef __i386__
  156     unsigned long event_callback_cs;        /* CS:EIP of event callback     */
  157     unsigned long event_callback_eip;
  158     unsigned long failsafe_callback_cs;     /* CS:EIP of failsafe callback  */
  159     unsigned long failsafe_callback_eip;
  160 #else
  161     unsigned long event_callback_eip;
  162     unsigned long failsafe_callback_eip;
  163 #ifdef __XEN__
  164     union {
  165         unsigned long syscall_callback_eip;
  166         struct {
  167             unsigned int event_callback_cs;    /* compat CS of event cb     */
  168             unsigned int failsafe_callback_cs; /* compat CS of failsafe cb  */
  169         };
  170     };
  171 #else
  172     unsigned long syscall_callback_eip;
  173 #endif
  174 #endif
  175     unsigned long vm_assist;                /* VMASST_TYPE_* bitmap */
  176 #ifdef __x86_64__
  177     /* Segment base addresses. */
  178     uint64_t      fs_base;
  179     uint64_t      gs_base_kernel;
  180     uint64_t      gs_base_user;
  181 #endif
  182 };
  183 typedef struct vcpu_guest_context vcpu_guest_context_t;
  184 DEFINE_XEN_GUEST_HANDLE(vcpu_guest_context_t);
  185 
  186 struct arch_shared_info {
  187     unsigned long max_pfn;                  /* max pfn that appears in table */
  188     /* Frame containing list of mfns containing list of mfns containing p2m. */
  189     xen_pfn_t     pfn_to_mfn_frame_list_list;
  190     unsigned long nmi_reason;
  191     uint64_t pad[32];
  192 };
  193 typedef struct arch_shared_info arch_shared_info_t;
  194 
  195 #endif /* !__ASSEMBLY__ */
  196 
  197 /*
  198  * ` enum neg_errnoval
  199  * ` HYPERVISOR_fpu_taskswitch(int set);
  200  * `
  201  * Sets (if set!=0) or clears (if set==0) CR0.TS.
  202  */
  203 
  204 /*
  205  * ` enum neg_errnoval
  206  * ` HYPERVISOR_set_debugreg(int regno, unsigned long value);
  207  *
  208  * ` unsigned long
  209  * ` HYPERVISOR_get_debugreg(int regno);
  210  * For 0<=reg<=7, returns the debug register value.
  211  * For other values of reg, returns ((unsigned long)-EINVAL).
  212  * (Unfortunately, this interface is defective.)
  213  */
  214 
  215 /*
  216  * Prefix forces emulation of some non-trapping instructions.
  217  * Currently only CPUID.
  218  */
  219 #ifdef __ASSEMBLY__
  220 #define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ;
  221 #define XEN_CPUID          XEN_EMULATE_PREFIX cpuid
  222 #else
  223 #define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; "
  224 #define XEN_CPUID          XEN_EMULATE_PREFIX "cpuid"
  225 #endif
  226 
  227 #endif /* __XEN_PUBLIC_ARCH_X86_XEN_H__ */
  228 
  229 /*
  230  * Local variables:
  231  * mode: C
  232  * c-set-style: "BSD"
  233  * c-basic-offset: 4
  234  * tab-width: 4
  235  * indent-tabs-mode: nil
  236  * End:
  237  */

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