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

     /******************************************************************************
      * arch-x86/xen.h
      * 
      * Guest OS interface to x86 Xen.
      * 
      * Permission is hereby granted, free of charge, to any person obtaining a copy
      * of this software and associated documentation files (the "Software"), to
      * deal in the Software without restriction, including without limitation the
      * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
     * sell copies of the Software, and to permit persons to whom the Software is
     * furnished to do so, subject to the following conditions:
     *
     * The above copyright notice and this permission notice shall be included in
     * all copies or substantial portions of the Software.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     * DEALINGS IN THE SOFTWARE.
     *
     * Copyright (c) 2004-2006, K A Fraser
     */
    
    #include "../xen.h"
    
    #ifndef __XEN_PUBLIC_ARCH_X86_XEN_H__
    #define __XEN_PUBLIC_ARCH_X86_XEN_H__
    
    /* Structural guest handles introduced in 0x00030201. */
    #if __XEN_INTERFACE_VERSION__ >= 0x00030201
    #define ___DEFINE_XEN_GUEST_HANDLE(name, type) \
        typedef struct { type *p; } __guest_handle_ ## name
    #else
    #define ___DEFINE_XEN_GUEST_HANDLE(name, type) \
        typedef type * __guest_handle_ ## name
    #endif
    
    /*
     * XEN_GUEST_HANDLE represents a guest pointer, when passed as a field
     * in a struct in memory.
     * XEN_GUEST_HANDLE_PARAM represent a guest pointer, when passed as an
     * hypercall argument.
     * XEN_GUEST_HANDLE_PARAM and XEN_GUEST_HANDLE are the same on X86 but
     * they might not be on other architectures.
     */
    #define __DEFINE_XEN_GUEST_HANDLE(name, type) \
        ___DEFINE_XEN_GUEST_HANDLE(name, type);   \
        ___DEFINE_XEN_GUEST_HANDLE(const_##name, const type)
    #define DEFINE_XEN_GUEST_HANDLE(name)   __DEFINE_XEN_GUEST_HANDLE(name, name)
    #define __XEN_GUEST_HANDLE(name)        __guest_handle_ ## name
    #define XEN_GUEST_HANDLE(name)          __XEN_GUEST_HANDLE(name)
    #define XEN_GUEST_HANDLE_PARAM(name)    XEN_GUEST_HANDLE(name)
    #define set_xen_guest_handle_raw(hnd, val)  do { (hnd).p = val; } while (0)
    #ifdef __XEN_TOOLS__
    #define get_xen_guest_handle(val, hnd)  do { val = (hnd).p; } while (0)
    #endif
    #define set_xen_guest_handle(hnd, val) set_xen_guest_handle_raw(hnd, val)
    
    #if defined(__i386__)
    #include "xen-x86_32.h"
    #elif defined(__x86_64__)
    #include "xen-x86_64.h"
    #endif
    
    #ifndef __ASSEMBLY__
    typedef unsigned long xen_pfn_t;
    #define PRI_xen_pfn "lx"
    #endif
    
    #define XEN_HAVE_PV_GUEST_ENTRY 1
    
    #define XEN_HAVE_PV_UPCALL_MASK 1
    
    /*
     * `incontents 200 segdesc Segment Descriptor Tables
     */
    /*
     * ` enum neg_errnoval
     * ` HYPERVISOR_set_gdt(const xen_pfn_t frames[], unsigned int entries);
     * `
     */
    /*
     * A number of GDT entries are reserved by Xen. These are not situated at the
     * start of the GDT because some stupid OSes export hard-coded selector values
     * in their ABI. These hard-coded values are always near the start of the GDT,
     * so Xen places itself out of the way, at the far end of the GDT.
     *
     * NB The LDT is set using the MMUEXT_SET_LDT op of HYPERVISOR_mmuext_op
     */
    #define FIRST_RESERVED_GDT_PAGE  14
    #define FIRST_RESERVED_GDT_BYTE  (FIRST_RESERVED_GDT_PAGE * 4096)
    #define FIRST_RESERVED_GDT_ENTRY (FIRST_RESERVED_GDT_BYTE / 8)
    
    
    /*
     * ` enum neg_errnoval
    * ` HYPERVISOR_update_descriptor(u64 pa, u64 desc);
    * `
    * ` @pa   The machine physical address of the descriptor to
    * `       update. Must be either a descriptor page or writable.
    * ` @desc The descriptor value to update, in the same format as a
    * `       native descriptor table entry.
    */
   
   /* Maximum number of virtual CPUs in legacy multi-processor guests. */
   #define XEN_LEGACY_MAX_VCPUS 32
   
   #ifndef __ASSEMBLY__
   
   typedef unsigned long xen_ulong_t;
   #define PRI_xen_ulong "lx"
   
   /*
    * ` enum neg_errnoval
    * ` HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp);
    * `
    * Sets the stack segment and pointer for the current vcpu.
    */
   
   /*
    * ` enum neg_errnoval
    * ` HYPERVISOR_set_trap_table(const struct trap_info traps[]);
    * `
    */
   /*
    * Send an array of these to HYPERVISOR_set_trap_table().
    * Terminate the array with a sentinel entry, with traps[].address==0.
    * The privilege level specifies which modes may enter a trap via a software
    * interrupt. On x86/64, since rings 1 and 2 are unavailable, we allocate
    * privilege levels as follows:
    *  Level == 0: Noone may enter
    *  Level == 1: Kernel may enter
    *  Level == 2: Kernel may enter
    *  Level == 3: Everyone may enter
    */
   #define TI_GET_DPL(_ti)      ((_ti)->flags & 3)
   #define TI_GET_IF(_ti)       ((_ti)->flags & 4)
   #define TI_SET_DPL(_ti,_dpl) ((_ti)->flags |= (_dpl))
   #define TI_SET_IF(_ti,_if)   ((_ti)->flags |= ((!!(_if))<<2))
   struct trap_info {
       uint8_t       vector;  /* exception vector                              */
       uint8_t       flags;   /* 0-3: privilege level; 4: clear event enable?  */
       uint16_t      cs;      /* code selector                                 */
       unsigned long address; /* code offset                                   */
   };
   typedef struct trap_info trap_info_t;
   DEFINE_XEN_GUEST_HANDLE(trap_info_t);
   
   typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */
   
   /*
    * The following is all CPU context. Note that the fpu_ctxt block is filled 
    * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used.
    *
    * Also note that when calling DOMCTL_setvcpucontext and VCPU_initialise
    * for HVM and PVH guests, not all information in this structure is updated:
    *
    * - For HVM guests, the structures read include: fpu_ctxt (if
    * VGCT_I387_VALID is set), flags, user_regs, debugreg[*]
    *
    * - PVH guests are the same as HVM guests, but additionally use ctrlreg[3] to
    * set cr3. All other fields not used should be set to 0.
    */
   struct vcpu_guest_context {
       /* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */
       struct { char x[512]; } fpu_ctxt;       /* User-level FPU registers     */
   #define VGCF_I387_VALID                (1<<0)
   #define VGCF_IN_KERNEL                 (1<<2)
   #define _VGCF_i387_valid               0
   #define VGCF_i387_valid                (1<<_VGCF_i387_valid)
   #define _VGCF_in_kernel                2
   #define VGCF_in_kernel                 (1<<_VGCF_in_kernel)
   #define _VGCF_failsafe_disables_events 3
   #define VGCF_failsafe_disables_events  (1<<_VGCF_failsafe_disables_events)
   #define _VGCF_syscall_disables_events  4
   #define VGCF_syscall_disables_events   (1<<_VGCF_syscall_disables_events)
   #define _VGCF_online                   5
   #define VGCF_online                    (1<<_VGCF_online)
       unsigned long flags;                    /* VGCF_* flags                 */
       struct cpu_user_regs user_regs;         /* User-level CPU registers     */
       struct trap_info trap_ctxt[256];        /* Virtual IDT                  */
       unsigned long ldt_base, ldt_ents;       /* LDT (linear address, # ents) */
       unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */
       unsigned long kernel_ss, kernel_sp;     /* Virtual TSS (only SS1/SP1)   */
       /* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */
       unsigned long ctrlreg[8];               /* CR0-CR7 (control registers)  */
       unsigned long debugreg[8];              /* DB0-DB7 (debug registers)    */
   #ifdef __i386__
       unsigned long event_callback_cs;        /* CS:EIP of event callback     */
       unsigned long event_callback_eip;
       unsigned long failsafe_callback_cs;     /* CS:EIP of failsafe callback  */
       unsigned long failsafe_callback_eip;
   #else
       unsigned long event_callback_eip;
       unsigned long failsafe_callback_eip;
   #ifdef __XEN__
       union {
           unsigned long syscall_callback_eip;
           struct {
               unsigned int event_callback_cs;    /* compat CS of event cb     */
               unsigned int failsafe_callback_cs; /* compat CS of failsafe cb  */
           };
       };
   #else
       unsigned long syscall_callback_eip;
   #endif
   #endif
       unsigned long vm_assist;                /* VMASST_TYPE_* bitmap */
   #ifdef __x86_64__
       /* Segment base addresses. */
       uint64_t      fs_base;
       uint64_t      gs_base_kernel;
       uint64_t      gs_base_user;
   #endif
   };
   typedef struct vcpu_guest_context vcpu_guest_context_t;
   DEFINE_XEN_GUEST_HANDLE(vcpu_guest_context_t);
   
   struct arch_shared_info {
       /*
        * Number of valid entries in the p2m table(s) anchored at
        * pfn_to_mfn_frame_list_list and/or p2m_vaddr.
        */
       unsigned long max_pfn;
       /*
        * Frame containing list of mfns containing list of mfns containing p2m.
        * A value of 0 indicates it has not yet been set up, ~0 indicates it has
        * been set to invalid e.g. due to the p2m being too large for the 3-level
        * p2m tree. In this case the linear mapper p2m list anchored at p2m_vaddr
        * is to be used.
        */
       xen_pfn_t     pfn_to_mfn_frame_list_list;
       unsigned long nmi_reason;
       /*
        * Following three fields are valid if p2m_cr3 contains a value different
        * from 0.
        * p2m_cr3 is the root of the address space where p2m_vaddr is valid.
        * p2m_cr3 is in the same format as a cr3 value in the vcpu register state
        * and holds the folded machine frame number (via xen_pfn_to_cr3) of a
        * L3 or L4 page table.
        * p2m_vaddr holds the virtual address of the linear p2m list. All entries
        * in the range [0...max_pfn[ are accessible via this pointer.
        * p2m_generation will be incremented by the guest before and after each
        * change of the mappings of the p2m list. p2m_generation starts at 0 and
        * a value with the least significant bit set indicates that a mapping
        * update is in progress. This allows guest external software (e.g. in Dom0)
        * to verify that read mappings are consistent and whether they have changed
        * since the last check.
        * Modifying a p2m element in the linear p2m list is allowed via an atomic
        * write only.
        */
       unsigned long p2m_cr3;         /* cr3 value of the p2m address space */
       unsigned long p2m_vaddr;       /* virtual address of the p2m list */
       unsigned long p2m_generation;  /* generation count of p2m mapping */
   #ifdef __i386__
       /* There's no room for this field in the generic structure. */
       uint32_t wc_sec_hi;
   #endif
   };
   typedef struct arch_shared_info arch_shared_info_t;
   
   #if defined(__XEN__) || defined(__XEN_TOOLS__)
   /*
    * struct xen_arch_domainconfig's ABI is covered by
    * XEN_DOMCTL_INTERFACE_VERSION.
    */
   struct xen_arch_domainconfig {
       char dummy;
   };
   #endif
   
   #endif /* !__ASSEMBLY__ */
   
   /*
    * ` enum neg_errnoval
    * ` HYPERVISOR_fpu_taskswitch(int set);
    * `
    * Sets (if set!=0) or clears (if set==0) CR0.TS.
    */
   
   /*
    * ` enum neg_errnoval
    * ` HYPERVISOR_set_debugreg(int regno, unsigned long value);
    *
    * ` unsigned long
    * ` HYPERVISOR_get_debugreg(int regno);
    * For 0<=reg<=7, returns the debug register value.
    * For other values of reg, returns ((unsigned long)-EINVAL).
    * (Unfortunately, this interface is defective.)
    */
   
   /*
    * Prefix forces emulation of some non-trapping instructions.
    * Currently only CPUID.
    */
   #ifdef __ASSEMBLY__
   #define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ;
   #define XEN_CPUID          XEN_EMULATE_PREFIX cpuid
   #else
   #define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; "
   #define XEN_CPUID          XEN_EMULATE_PREFIX "cpuid"
   #endif
   
   #endif /* __XEN_PUBLIC_ARCH_X86_XEN_H__ */
   
   /*
    * Local variables:
    * mode: C
    * c-file-style: "BSD"
    * c-basic-offset: 4
    * tab-width: 4
    * indent-tabs-mode: nil
    * End:
    */

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