Annotation of prex/sys/arch/i386/include/arch.h, Revision 1.1
1.1 ! nbrk 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 _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: uint32_t ebx; /* +0 (00) --- s/w trap frame --- */
! 45: uint32_t ecx; /* +4 (04) */
! 46: uint32_t edx; /* +8 (08) */
! 47: uint32_t esi; /* +12 (0C) */
! 48: uint32_t edi; /* +16 (10) */
! 49: uint32_t ebp; /* +20 (14) */
! 50: uint32_t eax; /* +24 (18) */
! 51: uint32_t ds; /* +28 (1C) */
! 52: uint32_t es; /* +32 (20) */
! 53: uint32_t trap_no; /* +36 (24) --- h/w trap frame --- */
! 54: uint32_t err_code; /* +40 (28) */
! 55: uint32_t eip; /* +44 (2C) */
! 56: uint32_t cs; /* +48 (30) */
! 57: uint32_t eflags; /* +52 (34) */
! 58: uint32_t esp; /* +56 (38) */
! 59: uint32_t ss; /* +60 (3C) */
! 60: };
! 61:
! 62: /*
! 63: * Kernel mode context for context switching.
! 64: */
! 65: struct kern_regs {
! 66: uint32_t eip; /* +0 (00) */
! 67: uint32_t ebx; /* +4 (04) */
! 68: uint32_t edi; /* +8 (08) */
! 69: uint32_t esi; /* +12 (0C) */
! 70: uint32_t ebp; /* +16 (10) */
! 71: uint32_t esp; /* +20 (14) */
! 72: };
! 73:
! 74: #ifdef CONFIG_FPU
! 75: /*
! 76: * FPU register for fsave/frstor
! 77: */
! 78: struct fpu_regs {
! 79: uint32_t ctrl_word;
! 80: uint32_t stat_word;
! 81: uint32_t tag_word;
! 82: uint32_t ip_offset;
! 83: uint32_t cs_sel;
! 84: uint32_t op_offset;
! 85: uint32_t op_sel;
! 86: uint32_t st[20];
! 87: };
! 88: #endif
! 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: /* types for context_set */
! 106: #define CTX_KSTACK 0 /* set kernel mode entry address */
! 107: #define CTX_KENTRY 1 /* set kernel mode entry address */
! 108: #define CTX_KARG 2 /* set kernel mode argument */
! 109: #define CTX_USTACK 3 /* set user mode stack address */
! 110: #define CTX_UENTRY 4 /* set user mode entry addres */
! 111: #define CTX_UARG 5 /* set user mode argument */
! 112:
! 113: extern void context_set(context_t, int, vaddr_t);
! 114: extern void context_switch(context_t, context_t);
! 115: extern void context_save(context_t);
! 116: extern void context_restore(context_t);
! 117:
! 118: /*
! 119: * Memory Management Unit
! 120: */
! 121: typedef uint32_t *pgd_t; /* page directory */
! 122:
! 123: /* memory page type */
! 124: #define PG_UNMAP 0 /* no page */
! 125: #define PG_READ 1 /* read only */
! 126: #define PG_WRITE 2 /* read/write */
! 127:
! 128: #ifdef CONFIG_MMU
! 129: extern void mmu_init(void);
! 130: extern pgd_t mmu_newmap(void);
! 131: extern void mmu_delmap(pgd_t);
! 132: extern int mmu_map(pgd_t, void *, void *, size_t, int);
! 133: extern void mmu_switch(pgd_t);
! 134: extern void *mmu_extract(pgd_t, void *, size_t);
! 135: #else /* CONFIG_MMU */
! 136: #define mmu_init() do {} while (0)
! 137: #endif /* CONFIG_MMU */
! 138:
! 139: /*
! 140: * User Memory access
! 141: */
! 142: extern int umem_copyin(const void *, void *, size_t);
! 143: extern int umem_copyout(const void *, void *, size_t);
! 144: extern int umem_strnlen(const char *, size_t, size_t *);
! 145:
! 146: extern void syscall_ret(void);
! 147: extern void breakpoint(void);
! 148:
! 149: #endif /* !_ARCH_H */
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