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;})
23 #define MCA_bus__is_a_macro
25 #include <asm/atomic.h>
26 #include <asm/ptrace.h>
27 #include <asm/procinfo.h>
28 #include <asm/types.h>
30 #define KERNEL_STACK_SIZE PAGE_SIZE
39 union debug_insn insn;
44 struct debug_entry bp[2];
47 struct thread_struct {
49 unsigned long address;
50 unsigned long trap_no;
51 unsigned long error_code;
53 struct debug_info debug;
56 #define INIT_THREAD { }
58 #define start_thread(regs,pc,sp) \
60 unsigned long *stack = (unsigned long *)sp; \
62 memzero(regs->uregs, sizeof(regs->uregs)); \
63 if (current->personality & ADDR_LIMIT_32BIT) \
64 regs->ARM_cpsr = USR_MODE; \
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) */ \
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 KSTK_EIP(tsk) (((unsigned long *)(4096+(unsigned long)(tsk)->thread_info))[1019])
95 #define KSTK_ESP(tsk) (((unsigned long *)(4096+(unsigned long)(tsk)->thread_info))[1017])
98 * Prefetching support - only ARMv5.
100 #if __LINUX_ARM_ARCH__ >= 5
102 #define ARCH_HAS_PREFETCH
103 #define prefetch(ptr) \
105 __asm__ __volatile__( \
108 : "o" (*(char *)(ptr)) \
112 #define ARCH_HAS_PREFETCHW
113 #define prefetchw(ptr) prefetch(ptr)
115 #define ARCH_HAS_SPINLOCK_PREFETCH
116 #define spin_lock_prefetch(x) do { } while (0)
122 #endif /* __ASM_ARM_PROCESSOR_H */