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

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

#ifndef __ASM_SH_PROCESSOR_H
#define __ASM_SH_PROCESSOR_H
#ifdef __KERNEL__

#include <asm/page.h>
#include <asm/types.h>
#include <asm/cache.h>
#include <linux/threads.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

/*
 *  CPU type and hardware bug flags. Kept separately for each CPU.
 *
 *  Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry
 *  in arch/sh/Kconfig, as well as an entry in arch/sh/kernel/setup.c
 *  for parsing the subtype in get_cpu_subtype().
 */
enum cpu_type {
	/* SH-2 types */
	CPU_SH7604,

	/* SH-3 types */
	CPU_SH7705, CPU_SH7707,  CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
	CPU_SH7709, CPU_SH7709A, CPU_SH7729, CPU_SH7300,

	/* SH-4 types */
	CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
	CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
	CPU_SH73180,

	/* Unknown subtype */
	CPU_SH_NONE
};

struct sh_cpuinfo {
	enum cpu_type type;
	char	hard_math;
	unsigned long loops_per_jiffy;

	unsigned int cpu_clock, master_clock, bus_clock, module_clock;
#ifdef CONFIG_CPU_SUBTYPE_ST40STB1
	unsigned int memory_clock;
#endif

	struct cache_info icache;
	struct cache_info dcache;

	unsigned long flags;
};

extern struct sh_cpuinfo boot_cpu_data;

#ifdef CONFIG_SMP
extern struct sh_cpuinfo cpu_data[];
#define current_cpu_data cpu_data[smp_processor_id()]
#else
#define cpu_data (&boot_cpu_data)
#define current_cpu_data boot_cpu_data
#endif

/*
 * 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_FD		0x00008000
#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;
};

/* 
 * Processor flags
 */

#define CPU_HAS_FPU		0x0001	/* Hardware FPU support */
#define CPU_HAS_P2_FLUSH_BUG	0x0002	/* Need to flush the cache in P2 area */
#define CPU_HAS_MMU_PAGE_ASSOC	0x0004	/* SH3: TLB way selection bit support */
#define CPU_HAS_DSP		0x0008	/* SH-DSP: DSP support */
#define CPU_HAS_PERF_COUNTER	0x0010	/* Hardware performance counters */

struct thread_struct {
	unsigned long sp;
	unsigned long pc;

	unsigned long trap_no, error_code;
	unsigned long address;
	/* Hardware debugging registers may come here */
	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  {						\
	sizeof(init_stack) + (long) &init_stack, /* sp */	\
	0,					 /* pc */	\
	0, 0, 							\
	0, 							\
	0, 							\
	{{{0,}},} 				/* fpu state */	\
}

/*
 * 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));
}

static __inline__ void release_fpu(struct pt_regs *regs)
{
	regs->sr |= SR_FD;
}

static __inline__ void grab_fpu(struct pt_regs *regs)
{
	regs->sr &= ~SR_FD;
}

#ifdef CONFIG_CPU_SH4
extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
#else
#define save_fpu(tsk)	do { } while (0)
#endif

#define unlazy_fpu(tsk, regs) do { 				\
	if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {	\
		save_fpu(tsk, regs); 				\
	}						\
} while (0)

#define clear_fpu(tsk, regs) do { 					\
	if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { 		\
		clear_tsk_thread_flag(tsk, TIF_USEDFPU); 	\
		release_fpu(regs);					\
	}							\
} while (0)

/* 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)

extern unsigned long get_wchan(struct task_struct *p);

#define KSTK_EIP(tsk)  ((tsk)->thread.pc)
#define KSTK_ESP(tsk)  ((tsk)->thread.sp)

#define cpu_sleep()	__asm__ __volatile__ ("sleep" : : : "memory")
#define cpu_relax()	do { } while (0)

#endif /* __KERNEL__ */
#endif /* __ASM_SH_PROCESSOR_H */
Commit	Line	Data
1da177e4 LT	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_H
	9	#define __ASM_SH_PROCESSOR_H
	10	#ifdef __KERNEL__
	11
	12	#include <asm/page.h>
	13	#include <asm/types.h>
	14	#include <asm/cache.h>
	15	#include <linux/threads.h>
	16	#include <asm/ptrace.h>
	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	/*
	30	* CPU type and hardware bug flags. Kept separately for each CPU.
	31	*
	32	* Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry
	33	* in arch/sh/Kconfig, as well as an entry in arch/sh/kernel/setup.c
	34	* for parsing the subtype in get_cpu_subtype().
	35	*/
	36	enum cpu_type {
	37	/* SH-2 types */
	38	CPU_SH7604,
	39
	40	/* SH-3 types */
	41	CPU_SH7705, CPU_SH7707, CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
	42	CPU_SH7709, CPU_SH7709A, CPU_SH7729, CPU_SH7300,
	43
	44	/* SH-4 types */
	45	CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
	46	CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
	47	CPU_SH73180,
	48
	49	/* Unknown subtype */
	50	CPU_SH_NONE
	51	};
	52
	53	struct sh_cpuinfo {
	54	enum cpu_type type;
	55	char hard_math;
	56	unsigned long loops_per_jiffy;
	57
	58	unsigned int cpu_clock, master_clock, bus_clock, module_clock;
	59	#ifdef CONFIG_CPU_SUBTYPE_ST40STB1
	60	unsigned int memory_clock;
	61	#endif
	62
	63	struct cache_info icache;
	64	struct cache_info dcache;
65
66	unsigned long flags;
67	};
68
69	extern struct sh_cpuinfo boot_cpu_data;
70
71	#ifdef CONFIG_SMP
72	extern struct sh_cpuinfo cpu_data[];
73	#define current_cpu_data cpu_data[smp_processor_id()]
74	#else
75	#define cpu_data (&boot_cpu_data)
76	#define current_cpu_data boot_cpu_data
77	#endif
78
79	/*
80	* User space process size: 2GB.
81	*
82	* Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
83	*/
84	#define TASK_SIZE 0x7c000000UL
85
86	/* This decides where the kernel will search for a free chunk of vm
87	* space during mmap's.
88	*/
89	#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
90
91	/*
92	* Bit of SR register
93	*
94	* FD-bit:
95	* When it's set, it means the processor doesn't have right to use FPU,
96	* and it results exception when the floating operation is executed.
97	*
98	* IMASK-bit:
99	* Interrupt level mask
100	*/
101	#define SR_FD 0x00008000
102	#define SR_DSP 0x00001000
103	#define SR_IMASK 0x000000f0
104
105	/*
106	* FPU structure and data
107	*/
108
109	struct sh_fpu_hard_struct {
110	unsigned long fp_regs[16];
111	unsigned long xfp_regs[16];
112	unsigned long fpscr;
113	unsigned long fpul;
114
115	long status; /* software status information */
116	};
117
118	/* Dummy fpu emulator */
119	struct sh_fpu_soft_struct {
120	unsigned long fp_regs[16];
121	unsigned long xfp_regs[16];
122	unsigned long fpscr;
123	unsigned long fpul;
124
125	unsigned char lookahead;
126	unsigned long entry_pc;
127	};
128
129	union sh_fpu_union {
130	struct sh_fpu_hard_struct hard;
131	struct sh_fpu_soft_struct soft;
132	};
133
134	/*
135	* Processor flags
136	*/
137
138	#define CPU_HAS_FPU 0x0001 /* Hardware FPU support */
139	#define CPU_HAS_P2_FLUSH_BUG 0x0002 /* Need to flush the cache in P2 area */
140	#define CPU_HAS_MMU_PAGE_ASSOC 0x0004 /* SH3: TLB way selection bit support */
141	#define CPU_HAS_DSP 0x0008 /* SH-DSP: DSP support */
142	#define CPU_HAS_PERF_COUNTER 0x0010 /* Hardware performance counters */
143
144	struct thread_struct {
145	unsigned long sp;
146	unsigned long pc;
147
148	unsigned long trap_no, error_code;
149	unsigned long address;
150	/* Hardware debugging registers may come here */
151	unsigned long ubc_pc;
152
153	/* floating point info */
154	union sh_fpu_union fpu;
155	};
156
157	/* Count of active tasks with UBC settings */
158	extern int ubc_usercnt;
159
160	#define INIT_THREAD { \
161	sizeof(init_stack) + (long) &init_stack, /* sp */ \
162	0, /* pc */ \
163	0, 0, \
164	0, \
165	0, \
166	{{{0,}},} /* fpu state */ \
167	}
168
169	/*
170	* Do necessary setup to start up a newly executed thread.
171	*/
172	#define start_thread(regs, new_pc, new_sp) \
173	set_fs(USER_DS); \
174	regs->pr = 0; \
175	regs->sr = SR_FD; /* User mode. */ \
176	regs->pc = new_pc; \
177	regs->regs[15] = new_sp
178
179	/* Forward declaration, a strange C thing */
180	struct task_struct;
181	struct mm_struct;
182
183	/* Free all resources held by a thread. */
184	extern void release_thread(struct task_struct *);
185
186	/* Prepare to copy thread state - unlazy all lazy status */
187	#define prepare_to_copy(tsk) do { } while (0)
188
189	/*
190	* create a kernel thread without removing it from tasklists
191	*/
192	extern int kernel_thread(int (fn)(void ), void * arg, unsigned long flags);
193
194	/* Copy and release all segment info associated with a VM */
195	#define copy_segments(p, mm) do { } while(0)
196	#define release_segments(mm) do { } while(0)
197
198	/*
199	* FPU lazy state save handling.
200	*/
201
202	static __inline__ void disable_fpu(void)
203	{
204	unsigned long __dummy;
205
206	/* Set FD flag in SR */
207	__asm__ __volatile__("stc sr, %0\n\t"
208	"or %1, %0\n\t"
209	"ldc %0, sr"
210	: "=&r" (__dummy)
211	: "r" (SR_FD));
212	}
213
214	static __inline__ void enable_fpu(void)
215	{
216	unsigned long __dummy;
217
218	/* Clear out FD flag in SR */
219	__asm__ __volatile__("stc sr, %0\n\t"
220	"and %1, %0\n\t"
221	"ldc %0, sr"
222	: "=&r" (__dummy)
223	: "r" (~SR_FD));
224	}
225
226	static __inline__ void release_fpu(struct pt_regs *regs)
227	{
228	regs->sr \|= SR_FD;
229	}
230
231	static __inline__ void grab_fpu(struct pt_regs *regs)
232	{
233	regs->sr &= ~SR_FD;
234	}
235
236	#ifdef CONFIG_CPU_SH4
237	extern void save_fpu(struct task_struct __tsk, struct pt_regs regs);
238	#else
239	#define save_fpu(tsk) do { } while (0)
240	#endif
241
242	#define unlazy_fpu(tsk, regs) do { \
243	if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
244	save_fpu(tsk, regs); \
245	} \
246	} while (0)
247
248	#define clear_fpu(tsk, regs) do { \
249	if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
250	clear_tsk_thread_flag(tsk, TIF_USEDFPU); \
251	release_fpu(regs); \
252	} \
253	} while (0)
254
255	/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
256	#define FPSCR_INIT 0x00080000
257
258	#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
259	#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
260
261	/*
262	* Return saved PC of a blocked thread.
263	*/
264	#define thread_saved_pc(tsk) (tsk->thread.pc)
265
266	extern unsigned long get_wchan(struct task_struct *p);
267
268	#define KSTK_EIP(tsk) ((tsk)->thread.pc)
269	#define KSTK_ESP(tsk) ((tsk)->thread.sp)
270
271	#define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
272	#define cpu_relax() do { } while (0)
273
274	#endif /* __KERNEL__ */
275	#endif /* __ASM_SH_PROCESSOR_H */