1/*
  2 *  arch/arm/include/asm/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/hw_breakpoint.h>
 23#include <asm/ptrace.h>
 24#include <asm/types.h>
 
 25
 26#ifdef __KERNEL__
 27#define STACK_TOP	((current->personality & ADDR_LIMIT_32BIT) ? \
 28			 TASK_SIZE : TASK_SIZE_26)
 29#define STACK_TOP_MAX	TASK_SIZE
 30#endif
 31
 32struct debug_info {
 33#ifdef CONFIG_HAVE_HW_BREAKPOINT
 34	struct perf_event	*hbp[ARM_MAX_HBP_SLOTS];
 35#endif
 36};
 37
 38struct thread_struct {
 39							/* fault info	  */
 40	unsigned long		address;
 41	unsigned long		trap_no;
 42	unsigned long		error_code;
 43							/* debugging	  */
 44	struct debug_info	debug;
 45};
 46
 47#define INIT_THREAD  {	}
 48
 49#ifdef CONFIG_MMU
 50#define nommu_start_thread(regs) do { } while (0)
 51#else
 52#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
 53#endif
 54
 55#define start_thread(regs,pc,sp)					\
 56({									\
 57	unsigned long *stack = (unsigned long *)sp;			\
 58	memset(regs->uregs, 0, sizeof(regs->uregs));			\
 59	if (current->personality & ADDR_LIMIT_32BIT)			\
 60		regs->ARM_cpsr = USR_MODE;				\
 61	else								\
 62		regs->ARM_cpsr = USR26_MODE;				\
 63	if (elf_hwcap & HWCAP_THUMB && pc & 1)				\
 64		regs->ARM_cpsr |= PSR_T_BIT;				\
 65	regs->ARM_cpsr |= PSR_ENDSTATE;					\
 66	regs->ARM_pc = pc & ~1;		/* pc */			\
 67	regs->ARM_sp = sp;		/* sp */			\
 68	regs->ARM_r2 = stack[2];	/* r2 (envp) */			\
 69	regs->ARM_r1 = stack[1];	/* r1 (argv) */			\
 70	regs->ARM_r0 = stack[0];	/* r0 (argc) */			\
 71	nommu_start_thread(regs);					\
 72})
 73
 74/* Forward declaration, a strange C thing */
 75struct task_struct;
 76
 77/* Free all resources held by a thread. */
 78extern void release_thread(struct task_struct *);
 79
 80unsigned long get_wchan(struct task_struct *p);
 81
 82#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
 83#define cpu_relax()			smp_mb()
 84#else
 85#define cpu_relax()			barrier()
 86#endif
 87
 88/*
 89 * Create a new kernel thread
 90 */
 91extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 92
 93#define task_pt_regs(p) \
 94	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
 95
 96#define KSTK_EIP(tsk)	task_pt_regs(tsk)->ARM_pc
 97#define KSTK_ESP(tsk)	task_pt_regs(tsk)->ARM_sp
 98
 
 
 
 
 
 
 
 
 
 
 
 99/*
100 * Prefetching support - only ARMv5.
101 */
102#if __LINUX_ARM_ARCH__ >= 5
103
104#define ARCH_HAS_PREFETCH
105static inline void prefetch(const void *ptr)
106{
107	__asm__ __volatile__(
108		"pld\t%a0"
109		:
110		: "p" (ptr)
111		: "cc");
112}
113
 
114#define ARCH_HAS_PREFETCHW
115#define prefetchw(ptr)	prefetch(ptr)
116
117#define ARCH_HAS_SPINLOCK_PREFETCH
118#define spin_lock_prefetch(x) do { } while (0)
119
 
 
 
 
 
 
120#endif
121
122#define HAVE_ARCH_PICK_MMAP_LAYOUT
123
124#endif
125
126#endif /* __ASM_ARM_PROCESSOR_H */

  1/*
  2 *  arch/arm/include/asm/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/hw_breakpoint.h>
 23#include <asm/ptrace.h>
 24#include <asm/types.h>
 25#include <asm/unified.h>
 26
 27#ifdef __KERNEL__
 28#define STACK_TOP	((current->personality & ADDR_LIMIT_32BIT) ? \
 29			 TASK_SIZE : TASK_SIZE_26)
 30#define STACK_TOP_MAX	TASK_SIZE
 31#endif
 32
 33struct debug_info {
 34#ifdef CONFIG_HAVE_HW_BREAKPOINT
 35	struct perf_event	*hbp[ARM_MAX_HBP_SLOTS];
 36#endif
 37};
 38
 39struct thread_struct {
 40							/* fault info	  */
 41	unsigned long		address;
 42	unsigned long		trap_no;
 43	unsigned long		error_code;
 44							/* debugging	  */
 45	struct debug_info	debug;
 46};
 47
 48#define INIT_THREAD  {	}
 49
 50#ifdef CONFIG_MMU
 51#define nommu_start_thread(regs) do { } while (0)
 52#else
 53#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
 54#endif
 55
 56#define start_thread(regs,pc,sp)					\
 57({									\
 
 58	memset(regs->uregs, 0, sizeof(regs->uregs));			\
 59	if (current->personality & ADDR_LIMIT_32BIT)			\
 60		regs->ARM_cpsr = USR_MODE;				\
 61	else								\
 62		regs->ARM_cpsr = USR26_MODE;				\
 63	if (elf_hwcap & HWCAP_THUMB && pc & 1)				\
 64		regs->ARM_cpsr |= PSR_T_BIT;				\
 65	regs->ARM_cpsr |= PSR_ENDSTATE;					\
 66	regs->ARM_pc = pc & ~1;		/* pc */			\
 67	regs->ARM_sp = sp;		/* sp */			\
 
 
 
 68	nommu_start_thread(regs);					\
 69})
 70
 71/* Forward declaration, a strange C thing */
 72struct task_struct;
 73
 74/* Free all resources held by a thread. */
 75extern void release_thread(struct task_struct *);
 76
 77unsigned long get_wchan(struct task_struct *p);
 78
 79#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
 80#define cpu_relax()			smp_mb()
 81#else
 82#define cpu_relax()			barrier()
 83#endif
 84
 85#define cpu_relax_lowlatency()                cpu_relax()
 
 
 
 86
 87#define task_pt_regs(p) \
 88	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
 89
 90#define KSTK_EIP(tsk)	task_pt_regs(tsk)->ARM_pc
 91#define KSTK_ESP(tsk)	task_pt_regs(tsk)->ARM_sp
 92
 93#ifdef CONFIG_SMP
 94#define __ALT_SMP_ASM(smp, up)						\
 95	"9998:	" smp "\n"						\
 96	"	.pushsection \".alt.smp.init\", \"a\"\n"		\
 97	"	.long	9998b\n"					\
 98	"	" up "\n"						\
 99	"	.popsection\n"
100#else
101#define __ALT_SMP_ASM(smp, up)	up
102#endif
103
104/*
105 * Prefetching support - only ARMv5.
106 */
107#if __LINUX_ARM_ARCH__ >= 5
108
109#define ARCH_HAS_PREFETCH
110static inline void prefetch(const void *ptr)
111{
112	__asm__ __volatile__(
113		"pld\t%a0"
114		:: "p" (ptr));
 
 
115}
116
117#if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
118#define ARCH_HAS_PREFETCHW
119static inline void prefetchw(const void *ptr)
120{
121	__asm__ __volatile__(
122		".arch_extension	mp\n"
123		__ALT_SMP_ASM(
124			WASM(pldw)		"\t%a0",
125			WASM(pld)		"\t%a0"
126		)
127		:: "p" (ptr));
128}
129#endif
130#endif
131
132#define HAVE_ARCH_PICK_MMAP_LAYOUT
133
134#endif
135
136#endif /* __ASM_ARM_PROCESSOR_H */