Annotation of prex-old/sys/arch/i386/include/arch.h, Revision 1.1.1.1
1.1 nbrk 1: /*
2: * Copyright (c) 2005-2007, 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 _ARCH_H
31: #define _ARCH_H
32:
33: /*
34: * Common register frame for trap/interrupt.
35: * These cpu state are saved into top of the kernel stack in
36: * trap/interrupt entries. Since the arguments of system calls are
37: * passed via registers, the system call library is completely
38: * dependent on this register format.
39: *
40: * The value of ss & esp are not valid for kernel mode trap
41: * because these are set only when privilege level is changed.
42: */
43: struct cpu_regs {
44: u_long ebx; /* +0 (00) --- s/w trap frame --- */
45: u_long ecx; /* +4 (04) */
46: u_long edx; /* +8 (08) */
47: u_long esi; /* +12 (0C) */
48: u_long edi; /* +16 (10) */
49: u_long ebp; /* +20 (14) */
50: u_long eax; /* +24 (18) */
51: u_long ds; /* +28 (1C) */
52: u_long es; /* +32 (20) */
53: u_long trap_no; /* +36 (24) --- h/w trap frame --- */
54: u_long err_code; /* +40 (28) */
55: u_long eip; /* +44 (2C) */
56: u_long cs; /* +48 (30) */
57: u_long eflags; /* +52 (34) */
58: u_long esp; /* +56 (38) */
59: u_long ss; /* +60 (3C) */
60: };
61:
62: /*
63: * Kernel mode context for context switching.
64: */
65: struct kern_regs {
66: u_long eip; /* +0 (00) */
67: u_long edi; /* +4 (04) */
68: u_long esi; /* +8 (08) */
69: u_long ebp; /* +12 (0C) */
70: u_long esp; /* +16 (10) */
71: };
72:
73: #ifdef CONFIG_FPU
74: /*
75: * FPU register for fsave/frstor
76: */
77: struct fpu_regs {
78: u_long ctrl_word;
79: u_long stat_word;
80: u_long tag_word;
81: u_long ip_offset;
82: u_long cs_sel;
83: u_long op_offset;
84: u_long op_sel;
85: u_long st[20];
86: };
87: #endif
88:
89: /*
90: * Processor context
91: */
92: struct context {
93: struct kern_regs kregs; /* kernel mode registers */
94: struct cpu_regs *uregs; /* user mode registers */
95: #ifdef CONFIG_FPU
96: struct fpu_regs *fregs; /* co-processor registers */
97: #endif
98: u_long esp0; /* top of kernel stack */
99: };
100:
101: typedef struct context *context_t; /* context id */
102:
103: /* types for context_set */
104: #define CTX_UENTRY 0 /* set user mode entry addres */
105: #define CTX_USTACK 1 /* set user mode stack address */
106: #define CTX_KENTRY 2 /* set kernel mode entry address */
107: #define CTX_KARG 3 /* set kernel mode argument */
108:
109: extern void context_init(context_t, u_long);
110: extern void context_set(context_t, int, u_long);
111: extern void context_switch(context_t, context_t);
112: extern void context_save(context_t, int);
113: extern void context_restore(context_t, void *);
114:
115: /*
116: * Memory Management Unit
117: */
118:
119: typedef long *pgd_t; /* page directory */
120:
121: /* memory page type */
122: #define PG_UNMAP 0 /* no page */
123: #define PG_READ 1 /* read only */
124: #define PG_WRITE 2 /* read/write */
125:
126: #ifdef CONFIG_MMU
127: extern void mmu_init(void);
128: extern pgd_t mmu_newmap(void);
129: extern void mmu_delmap(pgd_t);
130: extern int mmu_map(pgd_t, void *, void *, size_t, int);
131: extern void mmu_switch(pgd_t);
132: extern void *mmu_extract(pgd_t, void *, size_t);
133: #else /* CONFIG_MMU */
134: #define mmu_init() do {} while (0)
135: #endif /* CONFIG_MMU */
136:
137: /*
138: * User Memory access
139: */
140: extern int umem_copyin(void *, void *, size_t);
141: extern int umem_copyout(void *, void *, size_t);
142: extern int umem_strnlen(const char *, size_t, size_t *);
143:
144: #define breakpoint() __asm__ __volatile__("int $3"::)
145:
146: #endif /* !_ARCH_H */
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