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   1 /*-
   2  * Copyright (c) 2005-2008, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 
  30 #ifndef _X86_CONTEXT_H
  31 #define _X86_CONTEXT_H
  32 
  33 #include <sys/types.h>
  34 
  35 /*
  36  * Common register frame for trap/interrupt.
  37  * These cpu state are saved into top of the kernel stack in
  38  * trap/interrupt entries. Since the arguments of system calls are
  39  * passed via registers, the system call library is completely
  40  * dependent on this register format.
  41  *
  42  * The value of ss & esp are not valid for kernel mode trap
  43  * because these are set only when privilege level is changed.
  44  */
  45 struct cpu_regs {
  46         uint32_t        ebx;            /*  +0 (00) --- s/w trap frame --- */
  47         uint32_t        ecx;            /*  +4 (04) */
  48         uint32_t        edx;            /*  +8 (08) */
  49         uint32_t        esi;            /* +12 (0C) */
  50         uint32_t        eax;            /* +16 (10) */
  51         uint32_t        edi;            /* +20 (14) */
  52         uint32_t        ebp;            /* +24 (18) */
  53         uint32_t        ds;             /* +28 (1C) */
  54         uint32_t        es;             /* +32 (20) */
  55         uint32_t        trap_no;        /* +36 (24) --- h/w trap frame --- */
  56         uint32_t        err_code;       /* +40 (28) */
  57         uint32_t        eip;            /* +44 (2C) */
  58         uint32_t        cs;             /* +48 (30) */
  59         uint32_t        eflags;         /* +52 (34) */
  60         uint32_t        esp;            /* +56 (38) */
  61         uint32_t        ss;             /* +60 (3C) */
  62 };
  63 
  64 /*
  65  * Kernel mode context for context switching.
  66  */
  67 struct kern_regs {
  68         uint32_t        eip;            /*  +0 (00) */
  69         uint32_t        ebx;            /*  +4 (04) */
  70         uint32_t        edi;            /*  +8 (08) */
  71         uint32_t        esi;            /* +12 (0C) */
  72         uint32_t        ebp;            /* +16 (10) */
  73         uint32_t        esp;            /* +20 (14) */
  74 };
  75 
  76 /*
  77  * FPU register for fsave/frstor
  78  */
  79 struct fpu_regs {
  80         uint32_t        ctrl_word;
  81         uint32_t        stat_word;
  82         uint32_t        tag_word;
  83         uint32_t        ip_offset;
  84         uint32_t        cs_sel;
  85         uint32_t        op_offset;
  86         uint32_t        op_sel;
  87         uint32_t        st[20];
  88 };
  89 
  90 /*
  91  * Processor context
  92  */
  93 struct context {
  94         struct kern_regs kregs;         /* kernel mode registers */
  95         struct cpu_regs *uregs;         /* user mode registers */
  96         struct cpu_regs *saved_regs;    /* saved user mode registers */
  97 #ifdef CONFIG_FPU
  98         struct fpu_regs *fregs;         /* co-processor registers */
  99 #endif
 100         uint32_t         esp0;          /* top of kernel stack */
 101 };
 102 
 103 typedef struct context *context_t;      /* context id */
 104 
 105 #endif /* !_X86_CONTEXT_H */
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