arch/avr32/include/asm/processor.h

   1 /*
   2  * Copyright (C) 2006 Atmel Corporation
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22 #ifndef __ASM_AVR32_PROCESSOR_H
  23 #define __ASM_AVR32_PROCESSOR_H
  24
  25 #ifndef __ASSEMBLY__
  26
  27 #define current_text_addr() ({ void *pc; __asm__("mov %0,pc" : "=r"(pc)); pc; })
  28
  29 struct avr32_cpuinfo {
  30         unsigned long loops_per_jiffy;
  31 };
  32
  33 extern struct avr32_cpuinfo boot_cpu_data;
  34
  35 #ifdef CONFIG_SMP
  36 extern struct avr32_cpuinfo cpu_data[];
  37 #define current_cpu_data cpu_data[smp_processor_id()]
  38 #else
  39 #define cpu_data (&boot_cpu_data)
  40 #define current_cpu_data boot_cpu_data
  41 #endif
  42
  43 /* TODO: Make configurable (2GB will serve as a reasonable default) */
  44 #define TASK_SIZE       0x80000000
  45
  46 /* This decides where the kernel will search for a free chunk of vm
  47  * space during mmap's
  48  */
  49 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
  50
  51 #define cpu_relax()             barrier()
  52 #define cpu_sync_pipeline()     asm volatile("sub pc, -2" : : : "memory")
  53
  54 /* This struct contains the CPU context as stored by switch_to() */
  55 struct thread_struct {
  56         unsigned long pc;
  57         unsigned long ksp;      /* Kernel stack pointer */
  58         unsigned long r7;
  59         unsigned long r6;
  60         unsigned long r5;
  61         unsigned long r4;
  62         unsigned long r3;
  63         unsigned long r2;
  64         unsigned long r1;
  65         unsigned long r0;
  66 };
  67
  68 #define INIT_THREAD {                                           \
  69         .ksp = sizeof(init_stack) + (long)&init_stack,          \
  70 }
  71
  72 /*
  73  * Do necessary setup to start up a newly executed thread.
  74  */
  75 #define start_thread(regs, new_pc, new_sp)       \
  76         set_fs(USER_DS);                         \
  77         regs->sr = 0;           /* User mode. */ \
  78         regs->gr[REG_PC] = new_pc;               \
  79         regs->gr[REG_SP] = new_sp
  80
  81 struct task_struct;
  82
  83 /* Free all resources held by a thread */
  84 extern void release_thread(struct task_struct *);
  85
  86 /* Create a kernel thread without removing it from tasklists */
  87 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  88
  89 /* Prepare to copy thread state - unlazy all lazy status */
  90 #define prepare_to_copy(tsk) do { } while(0)
  91
  92 /* Return saved PC of a blocked thread */
  93 #define thread_saved_pc(tsk)    (tsk->thread.pc)
  94
  95 #endif /* __ASSEMBLY__ */
  96
  97 #endif /* __ASM_AVR32_PROCESSOR_H */