cregit-Linux how code gets into the kernel

Release 4.8 arch/blackfin/include/asm/processor.h

Directory: arch/blackfin/include/asm
/*
 * Copyright 2004-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#ifndef __ASM_BFIN_PROCESSOR_H

#define __ASM_BFIN_PROCESSOR_H

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */

#define current_text_addr() ({ __label__ _l; _l: &&_l;})

#include <asm/ptrace.h>
#include <mach/blackfin.h>




static inline unsigned long rdusp(void)
{
	unsigned long usp;

	__asm__ __volatile__("%0 = usp;\n\t":"=da"(usp));
	return usp;
}


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static inline void wrusp(unsigned long usp)
{
	__asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
}


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static inline unsigned long __get_SP(void)
{
	unsigned long sp;

	__asm__ __volatile__("%0 = sp;\n\t" : "=da"(sp));
	return sp;
}


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/*
 * User space process size: 1st byte beyond user address space.
 * Fairly meaningless on nommu.  Parts of user programs can be scattered
 * in a lot of places, so just disable this by setting it to 0xFFFFFFFF.
 */

#define TASK_SIZE	0xFFFFFFFF

#ifdef __KERNEL__

#define STACK_TOP	TASK_SIZE
#endif


#define TASK_UNMAPPED_BASE	0


struct thread_struct {
	
unsigned long ksp;	/* kernel stack pointer */
	
unsigned long usp;	/* user stack pointer */
	
unsigned short seqstat;	/* saved status register */
	
unsigned long esp0;	/* points to SR of stack frame pt_regs */
	
unsigned long pc;	/* instruction pointer */
	
void *        debuggerinfo;
};


#define INIT_THREAD  {                                               \
        sizeof(init_stack) + (unsigned long) init_stack, 0,     \
        PS_S, 0, 0                                              \
}

extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
					       unsigned long new_sp);

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

/* Free all resources held by a thread. */



static inline void release_thread(struct task_struct *dead_task)
{
}


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/*
 * Return saved PC of a blocked thread.
 */

#define thread_saved_pc(tsk)	(tsk->thread.pc)

unsigned long get_wchan(struct task_struct *p);


#define	KSTK_EIP(tsk)							\
    ({                                                                      \
        unsigned long eip = 0;                                          \
        if ((tsk)->thread.esp0 > PAGE_SIZE &&                           \
            MAP_NR((tsk)->thread.esp0) < max_mapnr)                     \
              eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc;        \
        eip; })

#define	KSTK_ESP(tsk)	((tsk) == current ? rdusp() : (tsk)->thread.usp)


#define cpu_relax()    	smp_mb()

#define cpu_relax_lowlatency() cpu_relax()

/* Get the Silicon Revision of the chip */



static inline uint32_t __pure bfin_revid(void)
{
	/* Always use CHIPID, to work around ANOMALY_05000234 */
	uint32_t revid = (bfin_read_CHIPID() & CHIPID_VERSION) >> 28;

#ifdef _BOOTROM_GET_DXE_ADDRESS_TWI
	/*
         * ANOMALY_05000364
         * Incorrect Revision Number in DSPID Register
         */
	if (ANOMALY_05000364 &&
	    bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI) == 0x2796)
		revid = 1;
#endif

	return revid;
}


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static inline uint16_t __pure bfin_cpuid(void)
{
	return (bfin_read_CHIPID() & CHIPID_FAMILY) >> 12;
}


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static inline uint32_t __pure bfin_dspid(void)
{
	return bfin_read_DSPID();
}


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#define blackfin_core_id() (bfin_dspid() & 0xff)




static inline uint32_t __pure bfin_compiled_revid(void)
{
#if defined(CONFIG_BF_REV_0_0)
	return 0;
#elif defined(CONFIG_BF_REV_0_1)
	return 1;
#elif defined(CONFIG_BF_REV_0_2)
	return 2;
#elif defined(CONFIG_BF_REV_0_3)
	return 3;
#elif defined(CONFIG_BF_REV_0_4)
	return 4;
#elif defined(CONFIG_BF_REV_0_5)
	return 5;
#elif defined(CONFIG_BF_REV_0_6)
	return 6;
#elif defined(CONFIG_BF_REV_ANY)
	return 0xffff;
#else
	return -1;
#endif
}


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#endif

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jie zhangjie zhang153.90%15.88%


mike frysingermike frysinger143.64%15.88%


david howellsdavid howells92.34%15.88%


davidlohr buesodavidlohr bueso51.30%15.88%


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Directory: arch/blackfin/include/asm



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