2 * linux/include/asm-arm/processor.h
4 * Copyright (C) 1995-1999 Russell King
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.
11 #ifndef __ASM_ARM_PROCESSOR_H
12 #define __ASM_ARM_PROCESSOR_H
15 * Default implementation of macro that returns current
16 * instruction pointer ("program counter").
18 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
22 #include <asm/ptrace.h>
23 #include <asm/types.h>
32 union debug_insn insn
;
37 struct debug_entry bp
[2];
40 struct thread_struct
{
42 unsigned long address
;
43 unsigned long trap_no
;
44 unsigned long error_code
;
46 struct debug_info debug
;
49 #define INIT_THREAD { }
52 #define nommu_start_thread(regs) do { } while (0)
54 #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
57 #define start_thread(regs,pc,sp) \
59 unsigned long *stack = (unsigned long *)sp; \
61 memzero(regs->uregs, sizeof(regs->uregs)); \
62 if (current->personality & ADDR_LIMIT_32BIT) \
63 regs->ARM_cpsr = USR_MODE; \
65 regs->ARM_cpsr = USR26_MODE; \
66 if (elf_hwcap & HWCAP_THUMB && pc & 1) \
67 regs->ARM_cpsr |= PSR_T_BIT; \
68 regs->ARM_pc = pc & ~1; /* pc */ \
69 regs->ARM_sp = sp; /* sp */ \
70 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \
71 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \
72 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \
73 nommu_start_thread(regs); \
76 /* Forward declaration, a strange C thing */
79 /* Free all resources held by a thread. */
80 extern void release_thread(struct task_struct
*);
82 /* Prepare to copy thread state - unlazy all lazy status */
83 #define prepare_to_copy(tsk) do { } while (0)
85 unsigned long get_wchan(struct task_struct
*p
);
87 #define cpu_relax() barrier()
90 * Create a new kernel thread
92 extern int kernel_thread(int (*fn
)(void *), void *arg
, unsigned long flags
);
94 #define task_pt_regs(p) \
95 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
97 #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
98 #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
101 * Prefetching support - only ARMv5.
103 #if __LINUX_ARM_ARCH__ >= 5
105 #define ARCH_HAS_PREFETCH
106 #define prefetch(ptr) \
108 __asm__ __volatile__( \
111 : "o" (*(char *)(ptr)) \
115 #define ARCH_HAS_PREFETCHW
116 #define prefetchw(ptr) prefetch(ptr)
118 #define ARCH_HAS_SPINLOCK_PREFETCH
119 #define spin_lock_prefetch(x) do { } while (0)
125 #endif /* __ASM_ARM_PROCESSOR_H */