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Annotation of Gnu-Mach/xen/public/arch-x86/xen-x86_64.h, revision 1.1

1.1     ! root        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 (arguments 1-5)
        !            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: #if __XEN_INTERFACE_VERSION__ < 0x00030203
        !            40: /*
        !            41:  * Legacy hypercall interface:
        !            42:  * As above, except the entry sequence to the hypervisor is:
        !            43:  *  mov $hypercall-number*32,%eax ; syscall
        !            44:  * Clobbered: %rcx, %r11, argument registers (as above)
        !            45:  */
        !            46: #define TRAP_INSTR "syscall"
        !            47: #endif
        !            48: 
        !            49: /*
        !            50:  * 64-bit segment selectors
        !            51:  * These flat segments are in the Xen-private section of every GDT. Since these
        !            52:  * are also present in the initial GDT, many OSes will be able to avoid
        !            53:  * installing their own GDT.
        !            54:  */
        !            55: 
        !            56: #define FLAT_RING3_CS32 0xe023  /* GDT index 260 */
        !            57: #define FLAT_RING3_CS64 0xe033  /* GDT index 261 */
        !            58: #define FLAT_RING3_DS32 0xe02b  /* GDT index 262 */
        !            59: #define FLAT_RING3_DS64 0x0000  /* NULL selector */
        !            60: #define FLAT_RING3_SS32 0xe02b  /* GDT index 262 */
        !            61: #define FLAT_RING3_SS64 0xe02b  /* GDT index 262 */
        !            62: 
        !            63: #define FLAT_KERNEL_DS64 FLAT_RING3_DS64
        !            64: #define FLAT_KERNEL_DS32 FLAT_RING3_DS32
        !            65: #define FLAT_KERNEL_DS   FLAT_KERNEL_DS64
        !            66: #define FLAT_KERNEL_CS64 FLAT_RING3_CS64
        !            67: #define FLAT_KERNEL_CS32 FLAT_RING3_CS32
        !            68: #define FLAT_KERNEL_CS   FLAT_KERNEL_CS64
        !            69: #define FLAT_KERNEL_SS64 FLAT_RING3_SS64
        !            70: #define FLAT_KERNEL_SS32 FLAT_RING3_SS32
        !            71: #define FLAT_KERNEL_SS   FLAT_KERNEL_SS64
        !            72: 
        !            73: #define FLAT_USER_DS64 FLAT_RING3_DS64
        !            74: #define FLAT_USER_DS32 FLAT_RING3_DS32
        !            75: #define FLAT_USER_DS   FLAT_USER_DS64
        !            76: #define FLAT_USER_CS64 FLAT_RING3_CS64
        !            77: #define FLAT_USER_CS32 FLAT_RING3_CS32
        !            78: #define FLAT_USER_CS   FLAT_USER_CS64
        !            79: #define FLAT_USER_SS64 FLAT_RING3_SS64
        !            80: #define FLAT_USER_SS32 FLAT_RING3_SS32
        !            81: #define FLAT_USER_SS   FLAT_USER_SS64
        !            82: 
        !            83: #define __HYPERVISOR_VIRT_START 0xFFFF800000000000
        !            84: #define __HYPERVISOR_VIRT_END   0xFFFF880000000000
        !            85: #define __MACH2PHYS_VIRT_START  0xFFFF800000000000
        !            86: #define __MACH2PHYS_VIRT_END    0xFFFF804000000000
        !            87: 
        !            88: #ifndef HYPERVISOR_VIRT_START
        !            89: #define HYPERVISOR_VIRT_START mk_unsigned_long(__HYPERVISOR_VIRT_START)
        !            90: #define HYPERVISOR_VIRT_END   mk_unsigned_long(__HYPERVISOR_VIRT_END)
        !            91: #endif
        !            92: 
        !            93: #define MACH2PHYS_VIRT_START  mk_unsigned_long(__MACH2PHYS_VIRT_START)
        !            94: #define MACH2PHYS_VIRT_END    mk_unsigned_long(__MACH2PHYS_VIRT_END)
        !            95: #define MACH2PHYS_NR_ENTRIES  ((MACH2PHYS_VIRT_END-MACH2PHYS_VIRT_START)>>3)
        !            96: #ifndef machine_to_phys_mapping
        !            97: #define machine_to_phys_mapping ((unsigned long *)HYPERVISOR_VIRT_START)
        !            98: #endif
        !            99: 
        !           100: /*
        !           101:  * int HYPERVISOR_set_segment_base(unsigned int which, unsigned long base)
        !           102:  *  @which == SEGBASE_*  ;  @base == 64-bit base address
        !           103:  * Returns 0 on success.
        !           104:  */
        !           105: #define SEGBASE_FS          0
        !           106: #define SEGBASE_GS_USER     1
        !           107: #define SEGBASE_GS_KERNEL   2
        !           108: #define SEGBASE_GS_USER_SEL 3 /* Set user %gs specified in base[15:0] */
        !           109: 
        !           110: /*
        !           111:  * int HYPERVISOR_iret(void)
        !           112:  * All arguments are on the kernel stack, in the following format.
        !           113:  * Never returns if successful. Current kernel context is lost.
        !           114:  * The saved CS is mapped as follows:
        !           115:  *   RING0 -> RING3 kernel mode.
        !           116:  *   RING1 -> RING3 kernel mode.
        !           117:  *   RING2 -> RING3 kernel mode.
        !           118:  *   RING3 -> RING3 user mode.
        !           119:  * However RING0 indicates that the guest kernel should return to iteself
        !           120:  * directly with
        !           121:  *      orb   $3,1*8(%rsp)
        !           122:  *      iretq
        !           123:  * If flags contains VGCF_in_syscall:
        !           124:  *   Restore RAX, RIP, RFLAGS, RSP.
        !           125:  *   Discard R11, RCX, CS, SS.
        !           126:  * Otherwise:
        !           127:  *   Restore RAX, R11, RCX, CS:RIP, RFLAGS, SS:RSP.
        !           128:  * All other registers are saved on hypercall entry and restored to user.
        !           129:  */
        !           130: /* Guest exited in SYSCALL context? Return to guest with SYSRET? */
        !           131: #define _VGCF_in_syscall 8
        !           132: #define VGCF_in_syscall  (1<<_VGCF_in_syscall)
        !           133: #define VGCF_IN_SYSCALL  VGCF_in_syscall
        !           134: 
        !           135: #ifndef __ASSEMBLY__
        !           136: 
        !           137: struct iret_context {
        !           138:     /* Top of stack (%rsp at point of hypercall). */
        !           139:     uint64_t rax, r11, rcx, flags, rip, cs, rflags, rsp, ss;
        !           140:     /* Bottom of iret stack frame. */
        !           141: };
        !           142: 
        !           143: #if defined(__GNUC__) && !defined(__STRICT_ANSI__)
        !           144: /* Anonymous union includes both 32- and 64-bit names (e.g., eax/rax). */
        !           145: #define __DECL_REG(name) union { \
        !           146:     uint64_t r ## name, e ## name; \
        !           147:     uint32_t _e ## name; \
        !           148: }
        !           149: #else
        !           150: /* Non-gcc sources must always use the proper 64-bit name (e.g., rax). */
        !           151: #define __DECL_REG(name) uint64_t r ## name
        !           152: #endif
        !           153: 
        !           154: struct cpu_user_regs {
        !           155:     uint64_t r15;
        !           156:     uint64_t r14;
        !           157:     uint64_t r13;
        !           158:     uint64_t r12;
        !           159:     __DECL_REG(bp);
        !           160:     __DECL_REG(bx);
        !           161:     uint64_t r11;
        !           162:     uint64_t r10;
        !           163:     uint64_t r9;
        !           164:     uint64_t r8;
        !           165:     __DECL_REG(ax);
        !           166:     __DECL_REG(cx);
        !           167:     __DECL_REG(dx);
        !           168:     __DECL_REG(si);
        !           169:     __DECL_REG(di);
        !           170:     uint32_t error_code;    /* private */
        !           171:     uint32_t entry_vector;  /* private */
        !           172:     __DECL_REG(ip);
        !           173:     uint16_t cs, _pad0[1];
        !           174:     uint8_t  saved_upcall_mask;
        !           175:     uint8_t  _pad1[3];
        !           176:     __DECL_REG(flags);      /* rflags.IF == !saved_upcall_mask */
        !           177:     __DECL_REG(sp);
        !           178:     uint16_t ss, _pad2[3];
        !           179:     uint16_t es, _pad3[3];
        !           180:     uint16_t ds, _pad4[3];
        !           181:     uint16_t fs, _pad5[3]; /* Non-zero => takes precedence over fs_base.     */
        !           182:     uint16_t gs, _pad6[3]; /* Non-zero => takes precedence over gs_base_usr. */
        !           183: };
        !           184: typedef struct cpu_user_regs cpu_user_regs_t;
        !           185: DEFINE_XEN_GUEST_HANDLE(cpu_user_regs_t);
        !           186: 
        !           187: #undef __DECL_REG
        !           188: 
        !           189: #define xen_pfn_to_cr3(pfn) ((unsigned long)(pfn) << 12)
        !           190: #define xen_cr3_to_pfn(cr3) ((unsigned long)(cr3) >> 12)
        !           191: 
        !           192: struct arch_vcpu_info {
        !           193:     unsigned long cr2;
        !           194:     unsigned long pad; /* sizeof(vcpu_info_t) == 64 */
        !           195: };
        !           196: typedef struct arch_vcpu_info arch_vcpu_info_t;
        !           197: 
        !           198: typedef unsigned long xen_callback_t;
        !           199: 
        !           200: #endif /* !__ASSEMBLY__ */
        !           201: 
        !           202: #endif /* __XEN_PUBLIC_ARCH_X86_XEN_X86_64_H__ */
        !           203: 
        !           204: /*
        !           205:  * Local variables:
        !           206:  * mode: C
        !           207:  * c-set-style: "BSD"
        !           208:  * c-basic-offset: 4
        !           209:  * tab-width: 4
        !           210:  * indent-tabs-mode: nil
        !           211:  * End:
        !           212:  */

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