kernel/include/task.h

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *  Copyright (C) 2008  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   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 as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20
  21 #ifndef _TASK_H
  22 #define _TASK_H
  23
  24 #include <build.h>
  25 #include <setjmp.h>
  26 #include <spinlock.h>
  27 #include <paging.h>
  28 #include <mytypes.h>
  29
  30 /* jmp_buf (E)IP and (E)SP register names for various environments:
  31                         Tinylib         TurboC  DJGPP   Linux (glibc5) */
  32 #define JMPBUF_IP       eip     /*      j_ip    __eip   __pc    */
  33 #define JMPBUF_SP       esp     /*      j_sp    __esp   __sp    */
  34 #define JMPBUF_FLAGS    eflags  /*      j_flag  __eflags ?      */
  35
  36 #ifdef ARCH_i386
  37 #define USER_STACK_SIZE 10240
  38 #endif
  39
  40 #ifdef ARCH_arm
  41 #define USER_STACK_SIZE 8192
  42 #endif
  43
  44 /* Task structure */
  45 typedef struct task_context {
  46         struct task_context *next, *prev;
  47
  48         char name[25];
  49         unsigned char stacks[USER_STACK_SIZE];
  50 #ifdef ARCH_i386
  51         jmp_buf state;
  52 #endif
  53 #ifdef ARCH_arm
  54         unsigned int *sp;
  55         unsigned int *entry;
  56 #endif
  57         unsigned char priority;
  58         unsigned char attick;
  59         unsigned short id;
  60         unsigned lasttick;
  61
  62         spinlock_t *spinlock;
  63         page_ent_t *page_cover;
  64
  65         enum {
  66                 TS_NULL = 0, TS_RUNNABLE = 1, TS_BLOCKED = 2, TS_ZOMBIE = 3
  67         } status;
  68 } task_t;
  69
  70
  71 extern task_t *_curr_task;
  72 extern task_t *task_create (char *name, unsigned entry, unsigned priority);
  73 extern bool task_done (task_t *task);
  74 extern task_t *task_find (unsigned short id);
  75
  76 #endif