[linux-2.6-block.git] / include / asm-sh / 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 <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\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;
	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()]

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

/* 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

/*
 * 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;
};

typedef struct {
	unsigned long seg;
} mm_segment_t;

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