Annotation of prex-old/sys/arch/arm/include/arch.h, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 2005, 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: * ARM register reference:
! 35: *
! 36: * Name Number ARM Procedure Calling Standard Role
! 37: *
! 38: * a1 r0 argument 1 / integer result / scratch register / argc
! 39: * a2 r1 argument 2 / scratch register / argv
! 40: * a3 r2 argument 3 / scratch register / envp
! 41: * a4 r3 argument 4 / scratch register
! 42: * v1 r4 register variable
! 43: * v2 r5 register variable
! 44: * v3 r6 register variable
! 45: * v4 r7 register variable
! 46: * v5 r8 register variable
! 47: * sb/v6 r9 static base / register variable
! 48: * sl/v7 r10 stack limit / stack chunk handle / reg. variable
! 49: * fp r11 frame pointer
! 50: * ip r12 scratch register / new-sb in inter-link-unit calls
! 51: * sp r13 lower end of current stack frame
! 52: * lr r14 link address / scratch register
! 53: * pc r15 program counter
! 54: */
! 55:
! 56: /*
! 57: * Common register frame for trap/interrupt.
! 58: * These cpu state are saved into top of the kernel stack in
! 59: * trap/interrupt entries. Since the arguments of system calls are
! 60: * passed via registers, the system call library is completely
! 61: * dependent on this register format.
! 62: */
! 63: struct cpu_regs {
! 64: u_long r0; /* +0 (00) */
! 65: u_long r1; /* +4 (04) */
! 66: u_long r2; /* +8 (08) */
! 67: u_long r3; /* +12 (0C) */
! 68: u_long r4; /* +16 (10) */
! 69: u_long r5; /* +20 (14) */
! 70: u_long r6; /* +24 (18) */
! 71: u_long r7; /* +28 (1C) */
! 72: u_long r8; /* +32 (20) */
! 73: u_long r9; /* +36 (24) */
! 74: u_long r10; /* +40 (28) */
! 75: u_long r11; /* +44 (2C) */
! 76: u_long r12; /* +48 (30) */
! 77: u_long sp; /* +52 (34) */
! 78: u_long lr; /* +56 (38) */
! 79: u_long svc_sp; /* +60 (3C) */
! 80: u_long svc_lr; /* +64 (40) */
! 81: u_long pc; /* +68 (44) */
! 82: u_long cpsr; /* +72 (48) */
! 83: };
! 84:
! 85: /*
! 86: * Kernel mode context for context switching.
! 87: */
! 88: struct kern_regs {
! 89: u_long r4;
! 90: u_long r5;
! 91: u_long r6;
! 92: u_long r7;
! 93: u_long r8;
! 94: u_long r9;
! 95: u_long r10;
! 96: u_long r11;
! 97: u_long sp;
! 98: u_long lr;
! 99: };
! 100:
! 101: /*
! 102: * Processor context
! 103: */
! 104: struct context {
! 105: struct kern_regs kregs; /* Kernel mode registers */
! 106: struct cpu_regs *uregs; /* User mode registers */
! 107: };
! 108:
! 109: typedef struct context *context_t; /* context id */
! 110:
! 111: /* Types for context_set */
! 112: #define CTX_UENTRY 0 /* Set user mode entry addres */
! 113: #define CTX_USTACK 1 /* Set user mode stack address */
! 114: #define CTX_KENTRY 2 /* Set kernel mode entry address */
! 115: #define CTX_KARG 3 /* Set kernel mode argument */
! 116:
! 117: extern void context_init(context_t, u_long);
! 118: extern void context_set(context_t, int type, u_long);
! 119: extern void context_switch(context_t, context_t);
! 120: extern void context_save(context_t, int);
! 121: extern void context_restore(context_t, void *);
! 122:
! 123: /*
! 124: * Memory Management Unit
! 125: */
! 126:
! 127: typedef long *pgd_t; /* Page directory */
! 128:
! 129: /* Memory page type */
! 130: #define PG_UNMAP 0 /* no page */
! 131: #define PG_READ 1 /* read only */
! 132: #define PG_WRITE 2 /* read/write */
! 133:
! 134: #ifdef CONFIG_MMU
! 135: extern void mmu_init(void);
! 136: extern int mmu_map(pgd_t, void *, void *, size_t, int);
! 137: extern pgd_t mmu_newmap(void);
! 138: extern void mmu_delmap(pgd_t);
! 139: extern void mmu_switch(pgd_t);
! 140: extern void *mmu_extract(pgd_t, void *, size_t);
! 141: #else /* CONFIG_MMU */
! 142: #define mmu_init() do {} while (0)
! 143: #endif /* !CONFIG_MMU */
! 144:
! 145: /*
! 146: * User Memory access
! 147: */
! 148: extern int umem_copyin(void *, void *, size_t);
! 149: extern int umem_copyout(void *, void *, size_t);
! 150: extern int umem_strnlen(const char *, size_t, size_t *);
! 151:
! 152: /* #define breakpoint() __asm__ __volatile__("bkpt"::) */
! 153: #define breakpoint() do {} while (0);
! 154:
! 155: #endif /* !_ARCH_H */
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