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processor.h

#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/blackfin.h>
#include <asm/segment.h>
#include <linux/compiler.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));
}

/*
 * 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                                \
}

/*
 * Do necessary setup to start up a newly executed thread.
 *
 * pass the data segment into user programs if it exists,
 * it can't hurt anything as far as I can tell
 */
#define start_thread(_regs, _pc, _usp)                            \
do {                                                  \
      set_fs(USER_DS);                                \
      (_regs)->pc = (_pc);                                  \
      if (current->mm)                                \
            (_regs)->p5 = current->mm->start_data;                \
      task_thread_info(current)->l1_task_info.stack_start         \
            = (void *)current->mm->context.stack_start;           \
      task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \
      memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \
            sizeof(*L1_SCRATCH_TASK_INFO));                       \
      wrusp(_usp);                                          \
} while(0)

/* 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)
{
}

#define prepare_to_copy(tsk)  do { } while (0)

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()     barrier()

/* Get the Silicon Revision of the chip */
static inline uint32_t __pure bfin_revid(void)
{
      /* stored in the upper 4 bits */
      uint32_t revid = bfin_read_CHIPID() >> 28;

#ifdef CONFIG_BF52x
      /* ANOMALY_05000357
       * Incorrect Revision Number in DSPID Register
       */
      if (revid == 0)
            switch (bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI)) {
            case 0x0010:
                  revid = 0;
                  break;
            case 0x2796:
                  revid = 1;
                  break;
            default:
                  revid = 0xFFFF;
                  break;
            }
#endif
      return revid;
}

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

}

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_ANY)
      return 0xffff;
#else
      return -1;
#endif
}

#endif

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