include/asm-arm/proc-armo/processor.h

   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