[deliverable/linux.git] / arch / arm / include / asm / processor.h

/*
 *  arch/arm/include/asm/processor.h
 *
 *  Copyright (C) 1995-1999 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __ASM_ARM_PROCESSOR_H
#define __ASM_ARM_PROCESSOR_H

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr() ({ __label__ _l; _l: &&_l;})

#ifdef __KERNEL__

#include <asm/hw_breakpoint.h>
#include <asm/ptrace.h>
#include <asm/types.h>
#include <asm/unified.h>

#ifdef __KERNEL__
#define STACK_TOP	((current->personality & ADDR_LIMIT_32BIT) ? \
			 TASK_SIZE : TASK_SIZE_26)
#define STACK_TOP_MAX	TASK_SIZE
#endif

struct debug_info {
#ifdef CONFIG_HAVE_HW_BREAKPOINT
	struct perf_event	*hbp[ARM_MAX_HBP_SLOTS];
#endif
};

struct thread_struct {
							/* fault info	  */
	unsigned long		address;
	unsigned long		trap_no;
	unsigned long		error_code;
							/* debugging	  */
	struct debug_info	debug;
};

#define INIT_THREAD  {	}

#ifdef CONFIG_MMU
#define nommu_start_thread(regs) do { } while (0)
#else
#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
#endif

#define start_thread(regs,pc,sp)					\
({									\
	memset(regs->uregs, 0, sizeof(regs->uregs));			\
	if (current->personality & ADDR_LIMIT_32BIT)			\
		regs->ARM_cpsr = USR_MODE;				\
	else								\
		regs->ARM_cpsr = USR26_MODE;				\
	if (elf_hwcap & HWCAP_THUMB && pc & 1)				\
		regs->ARM_cpsr |= PSR_T_BIT;				\
	regs->ARM_cpsr |= PSR_ENDSTATE;					\
	regs->ARM_pc = pc & ~1;		/* pc */			\
	regs->ARM_sp = sp;		/* sp */			\
	nommu_start_thread(regs);					\
})

/* Forward declaration, a strange C thing */
struct task_struct;

/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);

unsigned long get_wchan(struct task_struct *p);

#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
#define cpu_relax()			smp_mb()
#else
#define cpu_relax()			barrier()
#endif

#define cpu_relax_lowlatency()                cpu_relax()

#define task_pt_regs(p) \
	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)

#define KSTK_EIP(tsk)	task_pt_regs(tsk)->ARM_pc
#define KSTK_ESP(tsk)	task_pt_regs(tsk)->ARM_sp

#ifdef CONFIG_SMP
#define __ALT_SMP_ASM(smp, up)						\
	"9998:	" smp "\n"						\
	"	.pushsection \".alt.smp.init\", \"a\"\n"		\
	"	.long	9998b\n"					\
	"	" up "\n"						\
	"	.popsection\n"
#else
#define __ALT_SMP_ASM(smp, up)	up
#endif

/*
 * Prefetching support - only ARMv5.
 */
#if __LINUX_ARM_ARCH__ >= 5

#define ARCH_HAS_PREFETCH
static inline void prefetch(const void *ptr)
{
	__asm__ __volatile__(
		"pld\t%a0"
		:: "p" (ptr));
}

#if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
#define ARCH_HAS_PREFETCHW
static inline void prefetchw(const void *ptr)
{
	__asm__ __volatile__(
		".arch_extension	mp\n"
		__ALT_SMP_ASM(
			WASM(pldw)		"\t%a0",
			WASM(pld)		"\t%a0"
		)
		:: "p" (ptr));
}
#endif
#endif

#define HAVE_ARCH_PICK_MMAP_LAYOUT

#endif

#endif /* __ASM_ARM_PROCESSOR_H */
Commit	Line	Data
1da177e4	1	/*
4baa9922	2	* arch/arm/include/asm/processor.h
1da177e4 LT	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
864232fa	22	#include <asm/hw_breakpoint.h>
1da177e4	23	#include <asm/ptrace.h>
1da177e4	24	#include <asm/types.h>
27a84793	25	#include <asm/unified.h>
1da177e4	26
922a70d3	27	#ifdef __KERNEL__
794baba6	28	#define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \
922a70d3 DH	29	TASK_SIZE : TASK_SIZE_26)
	30	#define STACK_TOP_MAX TASK_SIZE
	31	#endif
	32
1da177e4	33	struct debug_info {
864232fa WD	34	#ifdef CONFIG_HAVE_HW_BREAKPOINT
	35	struct perf_event *hbp[ARM_MAX_HBP_SLOTS];
	36	#endif
1da177e4 LT	37	};
	38
	39	struct 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
e72b0475 HC	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
1da177e4 LT	56	#define start_thread(regs,pc,sp) \
1da177e4 LT	57	({ \
59f0cb0f	58	memset(regs->uregs, 0, sizeof(regs->uregs)); \
1da177e4 LT	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; \
26584853	65	regs->ARM_cpsr \|= PSR_ENDSTATE; \
1da177e4 LT	66	regs->ARM_pc = pc & ~1; /* pc */ \
1da177e4 LT	67	regs->ARM_sp = sp; /* sp */ \
e72b0475	68	nommu_start_thread(regs); \
1da177e4 LT	69	})
	70
	71	/* Forward declaration, a strange C thing */
	72	struct task_struct;
	73
	74	/* Free all resources held by a thread. */
	75	extern void release_thread(struct task_struct *);
	76
1da177e4 LT	77	unsigned long get_wchan(struct task_struct *p);
1da177e4 LT	78
5dab26af	79	#if __LINUX_ARM_ARCH__ == 6 \|\| defined(CONFIG_ARM_ERRATA_754327)
534be1d5 WD	80	#define cpu_relax() smp_mb()
534be1d5 WD	81	#else
1da177e4	82	#define cpu_relax() barrier()
534be1d5	83	#endif
1da177e4	84
3a6bfbc9 DB	85	#define cpu_relax_lowlatency() cpu_relax()
3a6bfbc9 DB	86
815d5ec8	87	#define task_pt_regs(p) \
32d39a93	88	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
815d5ec8 AV	89
	90	#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
	91	#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
1da177e4	92
27a84793 WD	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
1da177e4 LT	104	/*
	105	* Prefetching support - only ARMv5.
	106	*/
	107	#if __LINUX_ARM_ARCH__ >= 5
	108
	109	#define ARCH_HAS_PREFETCH
02828845 NP	110	static inline void prefetch(const void *ptr)
	111	{
	112	__asm__ __volatile__(
16f719de	113	"pld\t%a0"
e744dff7	114	:: "p" (ptr));
02828845	115	}
1da177e4	116
d8f57aa4	117	#if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
1da177e4	118	#define ARCH_HAS_PREFETCHW
d8f57aa4 WD	119	static 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
1da177e4 LT	130	#endif
1da177e4 LT	131
7dbaa466 RH	132	#define HAVE_ARCH_PICK_MMAP_LAYOUT
7dbaa466 RH	133
1da177e4 LT	134	#endif
	135
	136	#endif /* __ASM_ARM_PROCESSOR_H */