processor.h

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/*
 * 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;
}

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

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

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

/*
 * 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)
{
}

extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);

/*
 * Free current thread data structures etc..
 */
static inline void exit_thread(void)
{
}

/*
 * 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()


/* 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;
}

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

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

#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
}

#endif