[linux-2.6-block.git] / arch / sh / include / asm / processor_32.h

/*
 * include/asm-sh/processor.h
 *
 * Copyright (C) 1999, 2000  Niibe Yutaka
 * Copyright (C) 2002, 2003  Paul Mundt
 */

#ifndef __ASM_SH_PROCESSOR_32_H
#define __ASM_SH_PROCESSOR_32_H
#ifdef __KERNEL__

#include <linux/compiler.h>
#include <linux/linkage.h>
#include <asm/page.h>
#include <asm/types.h>
#include <asm/cache.h>
#include <asm/ptrace.h>

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr() ({ void *pc; __asm__("mova	1f, %0\n.align 2\n1:":"=z" (pc)); pc; })

/* Core Processor Version Register */
#define CCN_PVR		0xff000030
#define CCN_CVR		0xff000040
#define CCN_PRR		0xff000044

struct sh_cpuinfo {
	unsigned int type;
	int cut_major, cut_minor;
	unsigned long loops_per_jiffy;
	unsigned long asid_cache;

	struct cache_info icache;	/* Primary I-cache */
	struct cache_info dcache;	/* Primary D-cache */
	struct cache_info scache;	/* Secondary cache */

	unsigned long flags;
} __attribute__ ((aligned(L1_CACHE_BYTES)));

extern struct sh_cpuinfo cpu_data[];
#define boot_cpu_data cpu_data[0]
#define current_cpu_data cpu_data[smp_processor_id()]
#define raw_current_cpu_data cpu_data[raw_smp_processor_id()]

asmlinkage void __init sh_cpu_init(void);

/*
 * User space process size: 2GB.
 *
 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
 */
#define TASK_SIZE	0x7c000000UL

#define STACK_TOP	TASK_SIZE
#define STACK_TOP_MAX	STACK_TOP

/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE	(TASK_SIZE / 3)

/*
 * Bit of SR register
 *
 * FD-bit:
 *     When it's set, it means the processor doesn't have right to use FPU,
 *     and it results exception when the floating operation is executed.
 *
 * IMASK-bit:
 *     Interrupt level mask
 */
#define SR_DSP		0x00001000
#define SR_IMASK	0x000000f0
#define SR_FD		0x00008000

/*
 * FPU structure and data
 */

struct sh_fpu_hard_struct {
	unsigned long fp_regs[16];
	unsigned long xfp_regs[16];
	unsigned long fpscr;
	unsigned long fpul;

	long status; /* software status information */
};

/* Dummy fpu emulator  */
struct sh_fpu_soft_struct {
	unsigned long fp_regs[16];
	unsigned long xfp_regs[16];
	unsigned long fpscr;
	unsigned long fpul;

	unsigned char lookahead;
	unsigned long entry_pc;
};

union sh_fpu_union {
	struct sh_fpu_hard_struct hard;
	struct sh_fpu_soft_struct soft;
};

struct thread_struct {
	/* Saved registers when thread is descheduled */
	unsigned long sp;
	unsigned long pc;

	/* Hardware debugging registers */
	unsigned long ubc_pc;

	/* floating point info */
	union sh_fpu_union fpu;
};

/* Count of active tasks with UBC settings */
extern int ubc_usercnt;

#define INIT_THREAD  {						\
	.sp = sizeof(init_stack) + (long) &init_stack,		\
}

/*
 * Do necessary setup to start up a newly executed thread.
 */
#define start_thread(regs, new_pc, new_sp)	 \
	set_fs(USER_DS);			 \
	regs->pr = 0;				 \
	regs->sr = SR_FD;	/* User mode. */ \
	regs->pc = new_pc;			 \
	regs->regs[15] = new_sp

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

/*
 * create a kernel thread without removing it from tasklists
 */
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

/* Copy and release all segment info associated with a VM */
#define copy_segments(p, mm)	do { } while(0)
#define release_segments(mm)	do { } while(0)

/*
 * FPU lazy state save handling.
 */

static __inline__ void disable_fpu(void)
{
	unsigned long __dummy;

	/* Set FD flag in SR */
	__asm__ __volatile__("stc	sr, %0\n\t"
			     "or	%1, %0\n\t"
			     "ldc	%0, sr"
			     : "=&r" (__dummy)
			     : "r" (SR_FD));
}

static __inline__ void enable_fpu(void)
{
	unsigned long __dummy;

	/* Clear out FD flag in SR */
	__asm__ __volatile__("stc	sr, %0\n\t"
			     "and	%1, %0\n\t"
			     "ldc	%0, sr"
			     : "=&r" (__dummy)
			     : "r" (~SR_FD));
}

/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
#define FPSCR_INIT  0x00080000

#define	FPSCR_CAUSE_MASK	0x0001f000	/* Cause bits */
#define	FPSCR_FLAG_MASK		0x0000007c	/* Flag bits */

/*
 * Return saved PC of a blocked thread.
 */
#define thread_saved_pc(tsk)	(tsk->thread.pc)

void show_trace(struct task_struct *tsk, unsigned long *sp,
		struct pt_regs *regs);
extern unsigned long get_wchan(struct task_struct *p);

#define KSTK_EIP(tsk)  (task_pt_regs(tsk)->pc)
#define KSTK_ESP(tsk)  (task_pt_regs(tsk)->regs[15])

#define cpu_sleep()	__asm__ __volatile__ ("sleep" : : : "memory")
#define cpu_relax()	barrier()

#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
    defined(CONFIG_CPU_SH4)
#define PREFETCH_STRIDE		L1_CACHE_BYTES
#define ARCH_HAS_PREFETCH
#define ARCH_HAS_PREFETCHW
static inline void prefetch(void *x)
{
	__asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
}

#define prefetchw(x)	prefetch(x)
#endif

#endif /* __KERNEL__ */
#endif /* __ASM_SH_PROCESSOR_32_H */
Commit	Line	Data
af3c7dfe PM	1	/*
	2	* include/asm-sh/processor.h
	3	*
	4	* Copyright (C) 1999, 2000 Niibe Yutaka
	5	* Copyright (C) 2002, 2003 Paul Mundt
	6	*/
	7
	8	#ifndef __ASM_SH_PROCESSOR_32_H
	9	#define __ASM_SH_PROCESSOR_32_H
	10	#ifdef __KERNEL__
	11
	12	#include <linux/compiler.h>
fa43972f	13	#include <linux/linkage.h>
af3c7dfe PM	14	#include <asm/page.h>
	15	#include <asm/types.h>
	16	#include <asm/cache.h>
	17	#include <asm/ptrace.h>
af3c7dfe PM	18
	19	/*
	20	* Default implementation of macro that returns current
	21	* instruction pointer ("program counter").
	22	*/
103340cc	23	#define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n.align 2\n1:":"=z" (pc)); pc; })
af3c7dfe PM	24
	25	/* Core Processor Version Register */
	26	#define CCN_PVR 0xff000030
	27	#define CCN_CVR 0xff000040
	28	#define CCN_PRR 0xff000044
	29
	30	struct sh_cpuinfo {
	31	unsigned int type;
3611ee7a	32	int cut_major, cut_minor;
af3c7dfe PM	33	unsigned long loops_per_jiffy;
	34	unsigned long asid_cache;
	35
	36	struct cache_info icache; /* Primary I-cache */
	37	struct cache_info dcache; /* Primary D-cache */
	38	struct cache_info scache; /* Secondary cache */
	39
	40	unsigned long flags;
	41	} __attribute__ ((aligned(L1_CACHE_BYTES)));
	42
	43	extern struct sh_cpuinfo cpu_data[];
	44	#define boot_cpu_data cpu_data[0]
	45	#define current_cpu_data cpu_data[smp_processor_id()]
	46	#define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
	47
fa43972f PM	48	asmlinkage void __init sh_cpu_init(void);
fa43972f PM	49
af3c7dfe PM	50	/*
	51	* User space process size: 2GB.
	52	*
	53	* Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
	54	*/
	55	#define TASK_SIZE 0x7c000000UL
	56
922a70d3 DH	57	#define STACK_TOP TASK_SIZE
	58	#define STACK_TOP_MAX STACK_TOP
	59
af3c7dfe PM	60	/* This decides where the kernel will search for a free chunk of vm
	61	* space during mmap's.
	62	*/
	63	#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
	64
	65	/*
	66	* Bit of SR register
	67	*
	68	* FD-bit:
	69	* When it's set, it means the processor doesn't have right to use FPU,
	70	* and it results exception when the floating operation is executed.
	71	*
	72	* IMASK-bit:
	73	* Interrupt level mask
	74	*/
af3c7dfe PM	75	#define SR_DSP 0x00001000
af3c7dfe PM	76	#define SR_IMASK 0x000000f0
9bbafce2	77	#define SR_FD 0x00008000
af3c7dfe PM	78
	79	/*
	80	* FPU structure and data
	81	*/
	82
	83	struct sh_fpu_hard_struct {
	84	unsigned long fp_regs[16];
	85	unsigned long xfp_regs[16];
	86	unsigned long fpscr;
	87	unsigned long fpul;
	88
	89	long status; /* software status information */
	90	};
	91
	92	/* Dummy fpu emulator */
	93	struct sh_fpu_soft_struct {
	94	unsigned long fp_regs[16];
	95	unsigned long xfp_regs[16];
	96	unsigned long fpscr;
	97	unsigned long fpul;
	98
	99	unsigned char lookahead;
	100	unsigned long entry_pc;
	101	};
	102
	103	union sh_fpu_union {
	104	struct sh_fpu_hard_struct hard;
	105	struct sh_fpu_soft_struct soft;
	106	};
	107
	108	struct thread_struct {
	109	/* Saved registers when thread is descheduled */
	110	unsigned long sp;
	111	unsigned long pc;
	112
	113	/* Hardware debugging registers */
	114	unsigned long ubc_pc;
	115
	116	/* floating point info */
	117	union sh_fpu_union fpu;
	118	};
	119
af3c7dfe PM	120	/* Count of active tasks with UBC settings */
	121	extern int ubc_usercnt;
	122
	123	#define INIT_THREAD { \
	124	.sp = sizeof(init_stack) + (long) &init_stack, \
	125	}
	126
	127	/*
	128	* Do necessary setup to start up a newly executed thread.
	129	*/
	130	#define start_thread(regs, new_pc, new_sp) \
	131	set_fs(USER_DS); \
	132	regs->pr = 0; \
	133	regs->sr = SR_FD; /* User mode. */ \
	134	regs->pc = new_pc; \
	135	regs->regs[15] = new_sp
	136
	137	/* Forward declaration, a strange C thing */
	138	struct task_struct;
	139	struct mm_struct;
	140
	141	/* Free all resources held by a thread. */
	142	extern void release_thread(struct task_struct *);
	143
	144	/* Prepare to copy thread state - unlazy all lazy status */
	145	#define prepare_to_copy(tsk) do { } while (0)
	146
	147	/*
	148	* create a kernel thread without removing it from tasklists
	149	*/
	150	extern int kernel_thread(int (fn)(void ), void * arg, unsigned long flags);
	151
	152	/* Copy and release all segment info associated with a VM */
	153	#define copy_segments(p, mm) do { } while(0)
	154	#define release_segments(mm) do { } while(0)
	155
	156	/*
	157	* FPU lazy state save handling.
	158	*/
	159
	160	static __inline__ void disable_fpu(void)
	161	{
	162	unsigned long __dummy;
	163
	164	/* Set FD flag in SR */
	165	__asm__ __volatile__("stc sr, %0\n\t"
	166	"or %1, %0\n\t"
	167	"ldc %0, sr"
	168	: "=&r" (__dummy)
	169	: "r" (SR_FD));
	170	}
	171
	172	static __inline__ void enable_fpu(void)
	173	{
	174	unsigned long __dummy;
	175
	176	/* Clear out FD flag in SR */
	177	__asm__ __volatile__("stc sr, %0\n\t"
	178	"and %1, %0\n\t"
	179	"ldc %0, sr"
	180	: "=&r" (__dummy)
	181	: "r" (~SR_FD));
	182	}
	183
af3c7dfe PM	184	/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
	185	#define FPSCR_INIT 0x00080000
	186
	187	#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
	188	#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
	189
	190	/*
	191	* Return saved PC of a blocked thread.
	192	*/
	193	#define thread_saved_pc(tsk) (tsk->thread.pc)
	194
	195	void show_trace(struct task_struct tsk, unsigned long sp,
	196	struct pt_regs *regs);
	197	extern unsigned long get_wchan(struct task_struct *p);
	198
	199	#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
	200	#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
	201
	202	#define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
	203	#define cpu_relax() barrier()
	204
	205	#if defined(CONFIG_CPU_SH2A) \|\| defined(CONFIG_CPU_SH3) \|\| \
	206	defined(CONFIG_CPU_SH4)
	207	#define PREFETCH_STRIDE L1_CACHE_BYTES
	208	#define ARCH_HAS_PREFETCH
	209	#define ARCH_HAS_PREFETCHW
	210	static inline void prefetch(void *x)
	211	{
	212	__asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
	213	}
	214
	215	#define prefetchw(x) prefetch(x)
	216	#endif
	217
af3c7dfe PM	218	#endif /* __KERNEL__ */
af3c7dfe PM	219	#endif /* __ASM_SH_PROCESSOR_32_H */