1 /* 2 * linux/include/asm-arm/proc-armo/processor.h 3 * 4 * Copyright (C) 1996 Russell King. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * Changelog: 11 * 27-06-1996 RMK Created 12 * 10-10-1996 RMK Brought up to date with SA110 13 * 26-09-1996 RMK Added 'EXTRA_THREAD_STRUCT*' 14 * 28-09-1996 RMK Moved start_thread into the processor dependencies 15 * 11-01-1998 RMK Added new uaccess_t 16 * 09-09-1998 PJB Delete redundant `wp_works_ok' 17 * 30-05-1999 PJB Save sl across context switches 18 */ 19 #ifndef __ASM_PROC_PROCESSOR_H 20 #define __ASM_PROC_PROCESSOR_H 21 22 #include <linux/string.h> 23 24 #define KERNEL_STACK_SIZE 4096 25 26 struct context_save_struct { 27 unsigned long r4; 28 unsigned long r5; 29 unsigned long r6; 30 unsigned long r7; 31 unsigned long r8; 32 unsigned long r9; 33 unsigned long sl; 34 unsigned long fp; 35 unsigned long pc; 36 }; 37 38 #define INIT_CSS (struct context_save_struct){ 0, 0, 0, 0, 0, 0, 0, 0, SVC26_MODE } 39 40 typedef struct { 41 void (*put_byte)(void); /* Special calling convention */ 42 void (*get_byte)(void); /* Special calling convention */ 43 void (*put_half)(void); /* Special calling convention */ 44 void (*get_half)(void); /* Special calling convention */ 45 void (*put_word)(void); /* Special calling convention */ 46 void (*get_word)(void); /* Special calling convention */ 47 unsigned long (*copy_from_user)(void *to, const void *from, unsigned long sz); 48 unsigned long (*copy_to_user)(void *to, const void *from, unsigned long sz); 49 unsigned long (*clear_user)(void *addr, unsigned long sz); 50 unsigned long (*strncpy_from_user)(char *to, const char *from, unsigned long sz); 51 unsigned long (*strnlen_user)(const char *s, long n); 52 } uaccess_t; 53 54 extern uaccess_t uaccess_user, uaccess_kernel; 55 56 #define EXTRA_THREAD_STRUCT \ 57 uaccess_t *uaccess; /* User access functions*/ 58 59 #define EXTRA_THREAD_STRUCT_INIT \ 60 .uaccess = &uaccess_kernel, 61 62 #define start_thread(regs,pc,sp) \ 63 ({ \ 64 unsigned long *stack = (unsigned long *)sp; \ 65 set_fs(USER_DS); \ 66 memzero(regs->uregs, sizeof (regs->uregs)); \ 67 regs->ARM_pc = pc; /* pc */ \ 68 regs->ARM_sp = sp; /* sp */ \ 69 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \ 70 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \ 71 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \ 72 }) 73 74 #define KSTK_EIP(tsk) (((unsigned long *)(4096+(unsigned long)(tsk)))[1020]) 75 #define KSTK_ESP(tsk) (((unsigned long *)(4096+(unsigned long)(tsk)))[1018]) 76 77 /* Allocation and freeing of basic task resources. */ 78 /* 79 * NOTE! The task struct and the stack go together 80 */ 81 extern unsigned long get_page_8k(int priority); 82 extern void free_page_8k(unsigned long page); 83 84 #define ll_alloc_task_struct() ((struct task_struct *)get_page_8k(GFP_KERNEL)) 85 #define ll_free_task_struct(p) free_page_8k((unsigned long)(p)) 86 87 #endif 88