Statistics
| Branch: | Revision:

scoutos / prex-0.9.0 / bsp / hal / x86 / include / context.h @ 03e9c04a

History | View | Annotate | Download (3.43 KB)

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 */