root / prex-0.9.0 / bsp / hal / x86 / include / context.h @ 03e9c04a
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| 1 | 03e9c04a | Brad Neuman | /*-
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| 2 | * Copyright (c) 2005-2008, Kohsuke Ohtani
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 3. Neither the name of the author nor the names of any co-contributors
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| 14 | * may be used to endorse or promote products derived from this software
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| 15 | * without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 27 | * SUCH DAMAGE.
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| 28 | */
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| 29 | |||
| 30 | #ifndef _X86_CONTEXT_H
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| 31 | #define _X86_CONTEXT_H
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| 32 | |||
| 33 | #include <sys/types.h> |
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| 34 | |||
| 35 | /*
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| 36 | * Common register frame for trap/interrupt.
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| 37 | * These cpu state are saved into top of the kernel stack in
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| 38 | * trap/interrupt entries. Since the arguments of system calls are
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| 39 | * passed via registers, the system call library is completely
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| 40 | * dependent on this register format.
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| 41 | *
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| 42 | * The value of ss & esp are not valid for kernel mode trap
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| 43 | * because these are set only when privilege level is changed.
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| 44 | */
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| 45 | struct cpu_regs {
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| 46 | uint32_t ebx; /* +0 (00) --- s/w trap frame --- */
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| 47 | uint32_t ecx; /* +4 (04) */
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| 48 | uint32_t edx; /* +8 (08) */
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| 49 | uint32_t esi; /* +12 (0C) */
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| 50 | uint32_t eax; /* +16 (10) */
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| 51 | uint32_t edi; /* +20 (14) */
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| 52 | uint32_t ebp; /* +24 (18) */
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| 53 | uint32_t ds; /* +28 (1C) */
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| 54 | uint32_t es; /* +32 (20) */
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| 55 | uint32_t trap_no; /* +36 (24) --- h/w trap frame --- */
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| 56 | uint32_t err_code; /* +40 (28) */
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| 57 | uint32_t eip; /* +44 (2C) */
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| 58 | uint32_t cs; /* +48 (30) */
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| 59 | uint32_t eflags; /* +52 (34) */
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| 60 | uint32_t esp; /* +56 (38) */
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| 61 | uint32_t ss; /* +60 (3C) */
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| 62 | }; |
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| 63 | |||
| 64 | /*
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| 65 | * Kernel mode context for context switching.
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| 66 | */
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| 67 | struct kern_regs {
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| 68 | uint32_t eip; /* +0 (00) */
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| 69 | uint32_t ebx; /* +4 (04) */
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| 70 | uint32_t edi; /* +8 (08) */
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| 71 | uint32_t esi; /* +12 (0C) */
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| 72 | uint32_t ebp; /* +16 (10) */
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| 73 | uint32_t esp; /* +20 (14) */
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| 74 | }; |
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| 75 | |||
| 76 | /*
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| 77 | * FPU register for fsave/frstor
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| 78 | */
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| 79 | struct fpu_regs {
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| 80 | uint32_t ctrl_word; |
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| 81 | uint32_t stat_word; |
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| 82 | uint32_t tag_word; |
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| 83 | uint32_t ip_offset; |
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| 84 | uint32_t cs_sel; |
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| 85 | uint32_t op_offset; |
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| 86 | uint32_t op_sel; |
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| 87 | uint32_t st[20];
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| 88 | }; |
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| 89 | |||
| 90 | /*
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| 91 | * Processor context
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| 92 | */
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| 93 | struct context {
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| 94 | struct kern_regs kregs; /* kernel mode registers */ |
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| 95 | struct cpu_regs *uregs; /* user mode registers */ |
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| 96 | struct cpu_regs *saved_regs; /* saved user mode registers */ |
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| 97 | #ifdef CONFIG_FPU
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| 98 | struct fpu_regs *fregs; /* co-processor registers */ |
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| 99 | #endif
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| 100 | uint32_t esp0; /* top of kernel stack */
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| 101 | }; |
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| 102 | |||
| 103 | typedef struct context *context_t; /* context id */ |
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| 104 | |||
| 105 | #endif /* !_X86_CONTEXT_H */ |