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      1 /*
      2  *  linux/include/asm-arm/processor.h
      3  *
      4  *  Copyright (C) 1995-1999 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 
     11 #ifndef __ASM_ARM_PROCESSOR_H
     12 #define __ASM_ARM_PROCESSOR_H
     13 
     14 /*
     15  * Default implementation of macro that returns current
     16  * instruction pointer ("program counter").
     17  */
     18 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
     19 
     20 #ifdef __KERNEL__
     21 
     22 #include <asm/ptrace.h>
     23 #include <asm/procinfo.h>
     24 #include <asm/types.h>
     25 
     26 union debug_insn {
     27 	u32	arm;
     28 	u16	thumb;
     29 };
     30 
     31 struct debug_entry {
     32 	u32			address;
     33 	union debug_insn	insn;
     34 };
     35 
     36 struct debug_info {
     37 	int			nsaved;
     38 	struct debug_entry	bp[2];
     39 };
     40 
     41 struct thread_struct {
     42 							/* fault info	  */
     43 	unsigned long		address;
     44 	unsigned long		trap_no;
     45 	unsigned long		error_code;
     46 							/* debugging	  */
     47 	struct debug_info	debug;
     48 };
     49 
     50 #define INIT_THREAD  {	}
     51 
     52 #ifdef CONFIG_MMU
     53 #define nommu_start_thread(regs) do { } while (0)
     54 #else
     55 #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
     56 #endif
     57 
     58 #define start_thread(regs,pc,sp)					\
     59 ({									\
     60 	unsigned long *stack = (unsigned long *)sp;			\
     61 	set_fs(USER_DS);						\
     62 	memzero(regs->uregs, sizeof(regs->uregs));			\
     63 	if (current->personality & ADDR_LIMIT_32BIT)			\
     64 		regs->ARM_cpsr = USR_MODE;				\
     65 	else								\
     66 		regs->ARM_cpsr = USR26_MODE;				\
     67 	if (elf_hwcap & HWCAP_THUMB && pc & 1)				\
     68 		regs->ARM_cpsr |= PSR_T_BIT;				\
     69 	regs->ARM_pc = pc & ~1;		/* pc */			\
     70 	regs->ARM_sp = sp;		/* sp */			\
     71 	regs->ARM_r2 = stack[2];	/* r2 (envp) */			\
     72 	regs->ARM_r1 = stack[1];	/* r1 (argv) */			\
     73 	regs->ARM_r0 = stack[0];	/* r0 (argc) */			\
     74 	nommu_start_thread(regs);					\
     75 })
     76 
     77 /* Forward declaration, a strange C thing */
     78 struct task_struct;
     79 
     80 /* Free all resources held by a thread. */
     81 extern void release_thread(struct task_struct *);
     82 
     83 /* Prepare to copy thread state - unlazy all lazy status */
     84 #define prepare_to_copy(tsk)	do { } while (0)
     85 
     86 unsigned long get_wchan(struct task_struct *p);
     87 
     88 #define cpu_relax()			barrier()
     89 
     90 /*
     91  * Create a new kernel thread
     92  */
     93 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
     94 
     95 #define task_pt_regs(p) \
     96 	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
     97 
     98 #define KSTK_EIP(tsk)	task_pt_regs(tsk)->ARM_pc
     99 #define KSTK_ESP(tsk)	task_pt_regs(tsk)->ARM_sp
    100 
    101 /*
    102  * Prefetching support - only ARMv5.
    103  */
    104 #if __LINUX_ARM_ARCH__ >= 5
    105 
    106 #define ARCH_HAS_PREFETCH
    107 #define prefetch(ptr)				\
    108 	({					\
    109 		__asm__ __volatile__(		\
    110 		"pld\t%0"			\
    111 		:				\
    112 		: "o" (*(char *)(ptr))		\
    113 		: "cc");			\
    114 	})
    115 
    116 #define ARCH_HAS_PREFETCHW
    117 #define prefetchw(ptr)	prefetch(ptr)
    118 
    119 #define ARCH_HAS_SPINLOCK_PREFETCH
    120 #define spin_lock_prefetch(x) do { } while (0)
    121 
    122 #endif
    123 
    124 #endif
    125 
    126 #endif /* __ASM_ARM_PROCESSOR_H */
    127