/*
* 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)
{
}

/*
* 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