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

/*
 *  linux/include/asm-arm/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/ptrace.h>
#include <asm/types.h>

union debug_insn {
	u32	arm;
	u16	thumb;
};

struct debug_entry {
	u32			address;
	union debug_insn	insn;
};

struct debug_info {
	int			nsaved;
	struct debug_entry	bp[2];
};

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)					\
({									\
	unsigned long *stack = (unsigned long *)sp;			\
	set_fs(USER_DS);						\
	memzero(regs->uregs, 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_pc = pc & ~1;		/* pc */			\
	regs->ARM_sp = sp;		/* sp */			\
	regs->ARM_r2 = stack[2];	/* r2 (envp) */			\
	regs->ARM_r1 = stack[1];	/* r1 (argv) */			\
	regs->ARM_r0 = stack[0];	/* r0 (argc) */			\
	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 *);

/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk)	do { } while (0)

unsigned long get_wchan(struct task_struct *p);

#define cpu_relax()			barrier()

/*
 * Create a new kernel thread
 */
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);

#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

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

#define ARCH_HAS_PREFETCH
static inline void prefetch(const void *ptr)
{
	__asm__ __volatile__(
		"pld\t%0"
		:
		: "o" (*(char *)ptr)
		: "cc");
}

#define ARCH_HAS_PREFETCHW
#define prefetchw(ptr)	prefetch(ptr)

#define ARCH_HAS_SPINLOCK_PREFETCH
#define spin_lock_prefetch(x) do { } while (0)

#endif

#endif

#endif /* __ASM_ARM_PROCESSOR_H */
Commit	Line	Data
1da177e4 LT	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>
1da177e4 LT	23	#include <asm/types.h>
1da177e4 LT	24
1da177e4 LT	25	union debug_insn {
	26	u32 arm;
	27	u16 thumb;
	28	};
	29
	30	struct debug_entry {
	31	u32 address;
	32	union debug_insn insn;
	33	};
	34
	35	struct debug_info {
	36	int nsaved;
	37	struct debug_entry bp[2];
	38	};
	39
	40	struct thread_struct {
	41	/* fault info */
	42	unsigned long address;
	43	unsigned long trap_no;
	44	unsigned long error_code;
	45	/* debugging */
	46	struct debug_info debug;
	47	};
	48
	49	#define INIT_THREAD { }
	50
e72b0475 HC	51	#ifdef CONFIG_MMU
	52	#define nommu_start_thread(regs) do { } while (0)
	53	#else
	54	#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
	55	#endif
	56
1da177e4 LT	57	#define start_thread(regs,pc,sp) \
	58	({ \
	59	unsigned long stack = (unsigned long )sp; \
	60	set_fs(USER_DS); \
	61	memzero(regs->uregs, sizeof(regs->uregs)); \
	62	if (current->personality & ADDR_LIMIT_32BIT) \
	63	regs->ARM_cpsr = USR_MODE; \
	64	else \
	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) */ \
e72b0475	73	nommu_start_thread(regs); \
1da177e4 LT	74	})
	75
	76	/* Forward declaration, a strange C thing */
	77	struct task_struct;
	78
	79	/* Free all resources held by a thread. */
	80	extern void release_thread(struct task_struct *);
	81
	82	/* Prepare to copy thread state - unlazy all lazy status */
	83	#define prepare_to_copy(tsk) do { } while (0)
	84
	85	unsigned long get_wchan(struct task_struct *p);
	86
	87	#define cpu_relax() barrier()
	88
	89	/*
	90	* Create a new kernel thread
	91	*/
	92	extern int kernel_thread(int (fn)(void ), void *arg, unsigned long flags);
	93
815d5ec8	94	#define task_pt_regs(p) \
32d39a93	95	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
815d5ec8 AV	96
	97	#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
	98	#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
1da177e4 LT	99
	100	/*
	101	* Prefetching support - only ARMv5.
	102	*/
	103	#if __LINUX_ARM_ARCH__ >= 5
	104
	105	#define ARCH_HAS_PREFETCH
02828845 NP	106	static inline void prefetch(const void *ptr)
	107	{
	108	__asm__ __volatile__(
	109	"pld\t%0"
	110	:
	111	: "o" ((char )ptr)
	112	: "cc");
	113	}
1da177e4 LT	114
	115	#define ARCH_HAS_PREFETCHW
	116	#define prefetchw(ptr) prefetch(ptr)
	117
	118	#define ARCH_HAS_SPINLOCK_PREFETCH
	119	#define spin_lock_prefetch(x) do { } while (0)
	120
	121	#endif
	122
	123	#endif
	124
	125	#endif /* __ASM_ARM_PROCESSOR_H */