scoutos / prex-0.9.0 / bsp / hal / x86 / include / context.h @ 03e9c04a
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/*-
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* Copyright (c) 2005-2008, Kohsuke Ohtani
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _X86_CONTEXT_H
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#define _X86_CONTEXT_H
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#include <sys/types.h> |
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/*
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* Common register frame for trap/interrupt.
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* These cpu state are saved into top of the kernel stack in
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* trap/interrupt entries. Since the arguments of system calls are
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* passed via registers, the system call library is completely
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* dependent on this register format.
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*
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* The value of ss & esp are not valid for kernel mode trap
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* because these are set only when privilege level is changed.
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*/
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struct cpu_regs {
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uint32_t ebx; /* +0 (00) --- s/w trap frame --- */
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uint32_t ecx; /* +4 (04) */
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uint32_t edx; /* +8 (08) */
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uint32_t esi; /* +12 (0C) */
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uint32_t eax; /* +16 (10) */
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uint32_t edi; /* +20 (14) */
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uint32_t ebp; /* +24 (18) */
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uint32_t ds; /* +28 (1C) */
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uint32_t es; /* +32 (20) */
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uint32_t trap_no; /* +36 (24) --- h/w trap frame --- */
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uint32_t err_code; /* +40 (28) */
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uint32_t eip; /* +44 (2C) */
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uint32_t cs; /* +48 (30) */
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uint32_t eflags; /* +52 (34) */
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uint32_t esp; /* +56 (38) */
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uint32_t ss; /* +60 (3C) */
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}; |
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/*
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* Kernel mode context for context switching.
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*/
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struct kern_regs {
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uint32_t eip; /* +0 (00) */
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uint32_t ebx; /* +4 (04) */
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uint32_t edi; /* +8 (08) */
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uint32_t esi; /* +12 (0C) */
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uint32_t ebp; /* +16 (10) */
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uint32_t esp; /* +20 (14) */
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}; |
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/*
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* FPU register for fsave/frstor
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*/
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struct fpu_regs {
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uint32_t ctrl_word; |
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uint32_t stat_word; |
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uint32_t tag_word; |
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uint32_t ip_offset; |
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uint32_t cs_sel; |
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uint32_t op_offset; |
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uint32_t op_sel; |
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uint32_t st[20];
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}; |
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/*
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* Processor context
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*/
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struct context {
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struct kern_regs kregs; /* kernel mode registers */ |
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struct cpu_regs *uregs; /* user mode registers */ |
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struct cpu_regs *saved_regs; /* saved user mode registers */ |
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#ifdef CONFIG_FPU
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struct fpu_regs *fregs; /* co-processor registers */ |
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#endif
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uint32_t esp0; /* top of kernel stack */
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}; |
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typedef struct context *context_t; /* context id */ |
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#endif /* !_X86_CONTEXT_H */ |