processor.h 6.15 KB
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/*
 * include/asm-sh/processor.h
 *
 * Copyright (C) 1999, 2000  Niibe Yutaka
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 * Copyright (C) 2002, 2003  Paul Mundt
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 */

#ifndef __ASM_SH_PROCESSOR_H
#define __ASM_SH_PROCESSOR_H

#include <asm/page.h>
#include <asm/types.h>
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#include <asm/cache.h>
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#include <linux/threads.h>
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#include <asm/ptrace.h>
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/*
 * 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; })

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/* Core Processor Version Register */
#define CCN_PVR		0xff000030
#define CCN_PRR		0xff000044
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/*
 *  CPU type and hardware bug flags. Kept separately for each CPU.
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 *
 *  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().
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 */
enum cpu_type {
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	/* SH-2 types */
	CPU_SH7604,

	/* SH-3 types */
	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,

	/* Unknown subtype */
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	CPU_SH_NONE
};

struct sh_cpuinfo {
	enum cpu_type type;
	char	hard_math;
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	unsigned long loops_per_jiffy;
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	unsigned int cpu_clock, master_clock, bus_clock, module_clock;
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#ifdef CONFIG_CPU_SUBTYPE_ST40STB1
	unsigned int memory_clock;
#endif
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	struct cache_info icache;
	struct cache_info dcache;

	unsigned long flags;
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};

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extern struct sh_cpuinfo boot_cpu_data;

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#ifdef CONFIG_SMP
extern struct sh_cpuinfo cpu_data[];
#define current_cpu_data cpu_data[smp_processor_id()]
#else
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#define cpu_data (&boot_cpu_data)
#define current_cpu_data boot_cpu_data
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#endif
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/*
 * 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
 */
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#define SR_FD		0x00008000
#define SR_DSP		0x00001000
#define SR_IMASK	0x000000f0
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/*
 * FPU structure and data
 */

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

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

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

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/* 
 * 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 */
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struct thread_struct {
	unsigned long sp;
	unsigned long pc;

	unsigned long trap_no, error_code;
	unsigned long address;
	/* Hardware debugging registers may come here */
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	unsigned long ubc_pc;
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	/* floating point info */
	union sh_fpu_union fpu;
};

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

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#define INIT_THREAD  {						\
	sizeof(init_stack) + (long) &init_stack, /* sp */	\
	0,					 /* pc */	\
	0, 0, 							\
	0, 							\
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	0, 							\
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	{{{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;   		 	 \
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	regs->sr = SR_FD;	/* User mode. */ \
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	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 *);
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/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk)	do { } while (0)

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

/*
 * Bus types
 */
#define MCA_bus 0
#define MCA_bus__is_a_macro /* for versions in ksyms.c */

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/* 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)

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/*
 * FPU lazy state save handling.
 */

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static __inline__ void disable_fpu(void)
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{
	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));
}

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static __inline__ void enable_fpu(void)
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{
	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));
}

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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;
}

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

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

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

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

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/*
 * Return saved PC of a blocked thread.
 */
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#define thread_saved_pc(tsk)	(tsk->thread.pc)
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extern unsigned long get_wchan(struct task_struct *p);

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

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#define cpu_relax()	__asm__ __volatile__ ("sleep" : : : "memory")
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#endif /* __ASM_SH_PROCESSOR_H */