arch/avr32/include/asm/processor.h

   1 /*
   2  * Copyright (C) 2006 Atmel Corporation
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6 #ifndef __ASM_AVR32_PROCESSOR_H
   7 #define __ASM_AVR32_PROCESSOR_H
   8
   9 #ifndef __ASSEMBLY__
  10
  11 #define current_text_addr() ({ void *pc; __asm__("mov %0,pc" : "=r"(pc)); pc; })
  12
  13 struct avr32_cpuinfo {
  14         unsigned long loops_per_jiffy;
  15 };
  16
  17 extern struct avr32_cpuinfo boot_cpu_data;
  18
  19 #ifdef CONFIG_SMP
  20 extern struct avr32_cpuinfo cpu_data[];
  21 #define current_cpu_data cpu_data[smp_processor_id()]
  22 #else
  23 #define cpu_data (&boot_cpu_data)
  24 #define current_cpu_data boot_cpu_data
  25 #endif
  26
  27 /* TODO: Make configurable (2GB will serve as a reasonable default) */
  28 #define TASK_SIZE       0x80000000
  29
  30 /* This decides where the kernel will search for a free chunk of vm
  31  * space during mmap's
  32  */
  33 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
  34
  35 #define cpu_relax()             barrier()
  36 #define cpu_sync_pipeline()     asm volatile("sub pc, -2" : : : "memory")
  37
  38 /* This struct contains the CPU context as stored by switch_to() */
  39 struct thread_struct {
  40         unsigned long pc;
  41         unsigned long ksp;      /* Kernel stack pointer */
  42         unsigned long r7;
  43         unsigned long r6;
  44         unsigned long r5;
  45         unsigned long r4;
  46         unsigned long r3;
  47         unsigned long r2;
  48         unsigned long r1;
  49         unsigned long r0;
  50 };
  51
  52 #define INIT_THREAD {                                           \
  53         .ksp = sizeof(init_stack) + (long)&init_stack,          \
  54 }
  55
  56 /*
  57  * Do necessary setup to start up a newly executed thread.
  58  */
  59 #define start_thread(regs, new_pc, new_sp)       \
  60         set_fs(USER_DS);                         \
  61         regs->sr = 0;           /* User mode. */ \
  62         regs->gr[REG_PC] = new_pc;               \
  63         regs->gr[REG_SP] = new_sp
  64
  65 struct task_struct;
  66
  67 /* Free all resources held by a thread */
  68 extern void release_thread(struct task_struct *);
  69
  70 /* Create a kernel thread without removing it from tasklists */
  71 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  72
  73 /* Prepare to copy thread state - unlazy all lazy status */
  74 #define prepare_to_copy(tsk) do { } while(0)
  75
  76 /* Return saved PC of a blocked thread */
  77 #define thread_saved_pc(tsk)    (tsk->thread.pc)
  78
  79 #endif /* __ASSEMBLY__ */
  80
  81 #endif /* __ASM_AVR32_PROCESSOR_H */