[deliverable/linux.git] / arch / arm64 / include / asm / processor.h

/*
 * Based on arch/arm/include/asm/processor.h
 *
 * Copyright (C) 1995-1999 Russell King
 * Copyright (C) 2012 ARM Ltd.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_PROCESSOR_H
#define __ASM_PROCESSOR_H

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

#ifdef __KERNEL__

#include <linux/string.h>

#include <asm/fpsimd.h>
#include <asm/hw_breakpoint.h>
#include <asm/pgtable-hwdef.h>
#include <asm/ptrace.h>
#include <asm/types.h>

#ifdef __KERNEL__
#define STACK_TOP_MAX		TASK_SIZE_64
#ifdef CONFIG_COMPAT
#define AARCH32_VECTORS_BASE	0xffff0000
#define STACK_TOP		(test_thread_flag(TIF_32BIT) ? \
				AARCH32_VECTORS_BASE : STACK_TOP_MAX)
#else
#define STACK_TOP		STACK_TOP_MAX
#endif /* CONFIG_COMPAT */

#define ARCH_LOW_ADDRESS_LIMIT	PHYS_MASK
#endif /* __KERNEL__ */

struct debug_info {
	/* Have we suspended stepping by a debugger? */
	int			suspended_step;
	/* Allow breakpoints and watchpoints to be disabled for this thread. */
	int			bps_disabled;
	int			wps_disabled;
	/* Hardware breakpoints pinned to this task. */
	struct perf_event	*hbp_break[ARM_MAX_BRP];
	struct perf_event	*hbp_watch[ARM_MAX_WRP];
};

struct cpu_context {
	unsigned long x19;
	unsigned long x20;
	unsigned long x21;
	unsigned long x22;
	unsigned long x23;
	unsigned long x24;
	unsigned long x25;
	unsigned long x26;
	unsigned long x27;
	unsigned long x28;
	unsigned long fp;
	unsigned long sp;
	unsigned long pc;
};

struct thread_struct {
	struct cpu_context	cpu_context;	/* cpu context */
	unsigned long		tp_value;
	struct fpsimd_state	fpsimd_state;
	unsigned long		fault_address;	/* fault info */
	unsigned long		fault_code;	/* ESR_EL1 value */
	struct debug_info	debug;		/* debugging */
};

#define INIT_THREAD  {	}

static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
{
	memset(regs, 0, sizeof(*regs));
	regs->syscallno = ~0UL;
	regs->pc = pc;
}

static inline void start_thread(struct pt_regs *regs, unsigned long pc,
				unsigned long sp)
{
	start_thread_common(regs, pc);
	regs->pstate = PSR_MODE_EL0t;
	regs->sp = sp;
}

#ifdef CONFIG_COMPAT
static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
				       unsigned long sp)
{
	start_thread_common(regs, pc);
	regs->pstate = COMPAT_PSR_MODE_USR;
	if (pc & 1)
		regs->pstate |= COMPAT_PSR_T_BIT;

#ifdef __AARCH64EB__
	regs->pstate |= COMPAT_PSR_E_BIT;
#endif

	regs->compat_sp = sp;
}
#endif

/* 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);

#define cpu_relax()			barrier()
#define cpu_relax_lowlatency()                cpu_relax()

/* Thread switching */
extern struct task_struct *cpu_switch_to(struct task_struct *prev,
					 struct task_struct *next);

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

#define KSTK_EIP(tsk)	((unsigned long)task_pt_regs(tsk)->pc)
#define KSTK_ESP(tsk)	user_stack_pointer(task_pt_regs(tsk))

/*
 * Prefetching support
 */
#define ARCH_HAS_PREFETCH
static inline void prefetch(const void *ptr)
{
	asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr));
}

#define ARCH_HAS_PREFETCHW
static inline void prefetchw(const void *ptr)
{
	asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr));
}

#define ARCH_HAS_SPINLOCK_PREFETCH
static inline void spin_lock_prefetch(const void *x)
{
	prefetchw(x);
}

#define HAVE_ARCH_PICK_MMAP_LAYOUT

#endif

#endif /* __ASM_PROCESSOR_H */
Commit	Line	Data
9cce7a43 CM	1	/*
	2	* Based on arch/arm/include/asm/processor.h
	3	*
	4	* Copyright (C) 1995-1999 Russell King
	5	* Copyright (C) 2012 ARM Ltd.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19	#ifndef __ASM_PROCESSOR_H
	20	#define __ASM_PROCESSOR_H
	21
	22	/*
	23	* Default implementation of macro that returns current
	24	* instruction pointer ("program counter").
	25	*/
	26	#define current_text_addr() ({ __label__ _l; _l: &&_l;})
	27
	28	#ifdef __KERNEL__
	29
	30	#include <linux/string.h>
	31
	32	#include <asm/fpsimd.h>
	33	#include <asm/hw_breakpoint.h>
2ec4560b	34	#include <asm/pgtable-hwdef.h>
9cce7a43 CM	35	#include <asm/ptrace.h>
	36	#include <asm/types.h>
	37
	38	#ifdef __KERNEL__
	39	#define STACK_TOP_MAX TASK_SIZE_64
	40	#ifdef CONFIG_COMPAT
	41	#define AARCH32_VECTORS_BASE 0xffff0000
	42	#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
	43	AARCH32_VECTORS_BASE : STACK_TOP_MAX)
	44	#else
	45	#define STACK_TOP STACK_TOP_MAX
	46	#endif /* CONFIG_COMPAT */
f483a853 WD	47
f483a853 WD	48	#define ARCH_LOW_ADDRESS_LIMIT PHYS_MASK
9cce7a43 CM	49	#endif /* __KERNEL__ */
	50
	51	struct debug_info {
	52	/* Have we suspended stepping by a debugger? */
	53	int suspended_step;
	54	/* Allow breakpoints and watchpoints to be disabled for this thread. */
	55	int bps_disabled;
	56	int wps_disabled;
	57	/* Hardware breakpoints pinned to this task. */
	58	struct perf_event *hbp_break[ARM_MAX_BRP];
	59	struct perf_event *hbp_watch[ARM_MAX_WRP];
	60	};
	61
	62	struct cpu_context {
	63	unsigned long x19;
	64	unsigned long x20;
	65	unsigned long x21;
	66	unsigned long x22;
	67	unsigned long x23;
	68	unsigned long x24;
	69	unsigned long x25;
	70	unsigned long x26;
	71	unsigned long x27;
	72	unsigned long x28;
	73	unsigned long fp;
	74	unsigned long sp;
	75	unsigned long pc;
	76	};
	77
	78	struct thread_struct {
	79	struct cpu_context cpu_context; /* cpu context */
	80	unsigned long tp_value;
	81	struct fpsimd_state fpsimd_state;
	82	unsigned long fault_address; /* fault info */
9141300a	83	unsigned long fault_code; /* ESR_EL1 value */
9cce7a43 CM	84	struct debug_info debug; /* debugging */
	85	};
	86
	87	#define INIT_THREAD { }
	88
	89	static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
	90	{
	91	memset(regs, 0, sizeof(*regs));
	92	regs->syscallno = ~0UL;
	93	regs->pc = pc;
	94	}
	95
	96	static inline void start_thread(struct pt_regs *regs, unsigned long pc,
	97	unsigned long sp)
	98	{
9cce7a43 CM	99	start_thread_common(regs, pc);
	100	regs->pstate = PSR_MODE_EL0t;
	101	regs->sp = sp;
9cce7a43 CM	102	}
	103
	104	#ifdef CONFIG_COMPAT
	105	static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
	106	unsigned long sp)
	107	{
9cce7a43 CM	108	start_thread_common(regs, pc);
	109	regs->pstate = COMPAT_PSR_MODE_USR;
	110	if (pc & 1)
	111	regs->pstate \|= COMPAT_PSR_T_BIT;
a795a38e WD	112
	113	#ifdef __AARCH64EB__
	114	regs->pstate \|= COMPAT_PSR_E_BIT;
	115	#endif
	116
9cce7a43	117	regs->compat_sp = sp;
9cce7a43 CM	118	}
	119	#endif
	120
	121	/* Forward declaration, a strange C thing */
	122	struct task_struct;
	123
	124	/* Free all resources held by a thread. */
	125	extern void release_thread(struct task_struct *);
	126
9cce7a43 CM	127	unsigned long get_wchan(struct task_struct *p);
	128
	129	#define cpu_relax() barrier()
3a6bfbc9	130	#define cpu_relax_lowlatency() cpu_relax()
9cce7a43 CM	131
	132	/* Thread switching */
	133	extern struct task_struct cpu_switch_to(struct task_struct prev,
	134	struct task_struct *next);
	135
9cce7a43 CM	136	#define task_pt_regs(p) \
	137	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
	138
ebe6152e	139	#define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc)
3168a743	140	#define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk))
9cce7a43 CM	141
	142	/*
	143	* Prefetching support
	144	*/
	145	#define ARCH_HAS_PREFETCH
	146	static inline void prefetch(const void *ptr)
	147	{
	148	asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr));
	149	}
	150
	151	#define ARCH_HAS_PREFETCHW
	152	static inline void prefetchw(const void *ptr)
	153	{
	154	asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr));
	155	}
	156
	157	#define ARCH_HAS_SPINLOCK_PREFETCH
	158	static inline void spin_lock_prefetch(const void *x)
	159	{
	160	prefetchw(x);
	161	}
	162
	163	#define HAVE_ARCH_PICK_MMAP_LAYOUT
	164
	165	#endif
	166
	167	#endif /* __ASM_PROCESSOR_H */