LXR linux/arch/blackfin/include/asm/processor.h

   1/*
   2 * Copyright 2004-2009 Analog Devices Inc.
   3 *
   4 * Licensed under the GPL-2 or later.
   5 */
   6
   7#ifndef __ASM_BFIN_PROCESSOR_H
   8#define __ASM_BFIN_PROCESSOR_H
   9
  10/*
  11 * Default implementation of macro that returns current
  12 * instruction pointer ("program counter").
  13 */
  14#define current_text_addr() ({ __label__ _l; _l: &&_l;})
  15
  16#include <asm/ptrace.h>
  17#include <asm/blackfin.h>
  18
  19static inline unsigned long rdusp(void)
  20{
  21        unsigned long usp;
  22
  23        __asm__ __volatile__("%0 = usp;\n\t":"=da"(usp));
  24        return usp;
  25}
  26
  27static inline void wrusp(unsigned long usp)
  28{
  29        __asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
  30}
  31
  32static inline unsigned long __get_SP(void)
  33{
  34        unsigned long sp;
  35
  36        __asm__ __volatile__("%0 = sp;\n\t" : "=da"(sp));
  37        return sp;
  38}
  39
  40/*
  41 * User space process size: 1st byte beyond user address space.
  42 * Fairly meaningless on nommu.  Parts of user programs can be scattered
  43 * in a lot of places, so just disable this by setting it to 0xFFFFFFFF.
  44 */
  45#define TASK_SIZE       0xFFFFFFFF
  46
  47#ifdef __KERNEL__
  48#define STACK_TOP       TASK_SIZE
  49#endif
  50
  51#define TASK_UNMAPPED_BASE      0
  52
  53struct thread_struct {
  54        unsigned long ksp;      /* kernel stack pointer */
  55        unsigned long usp;      /* user stack pointer */
  56        unsigned short seqstat; /* saved status register */
  57        unsigned long esp0;     /* points to SR of stack frame pt_regs */
  58        unsigned long pc;       /* instruction pointer */
  59        void *        debuggerinfo;
  60};
  61
  62#define INIT_THREAD  {                                          \
  63        sizeof(init_stack) + (unsigned long) init_stack, 0,     \
  64        PS_S, 0, 0                                              \
  65}
  66
  67extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
  68                                               unsigned long new_sp);
  69
  70/* Forward declaration, a strange C thing */
  71struct task_struct;
  72
  73/* Free all resources held by a thread. */
  74static inline void release_thread(struct task_struct *dead_task)
  75{
  76}
  77
  78#define prepare_to_copy(tsk)    do { } while (0)
  79
  80extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
  81
  82/*
  83 * Free current thread data structures etc..
  84 */
  85static inline void exit_thread(void)
  86{
  87}
  88
  89/*
  90 * Return saved PC of a blocked thread.
  91 */
  92#define thread_saved_pc(tsk)    (tsk->thread.pc)
  93
  94unsigned long get_wchan(struct task_struct *p);
  95
  96#define KSTK_EIP(tsk)                                                   \
  97    ({                                                                  \
  98        unsigned long eip = 0;                                          \
  99        if ((tsk)->thread.esp0 > PAGE_SIZE &&                           \
 100            MAP_NR((tsk)->thread.esp0) < max_mapnr)                     \
 101              eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc;        \
 102        eip; })
 103#define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
 104
 105#define cpu_relax()     smp_mb()
 106
 107
 108/* Get the Silicon Revision of the chip */
 109static inline uint32_t __pure bfin_revid(void)
 110{
 111        /* Always use CHIPID, to work around ANOMALY_05000234 */
 112        uint32_t revid = (bfin_read_CHIPID() & CHIPID_VERSION) >> 28;
 113
 114#ifdef _BOOTROM_GET_DXE_ADDRESS_TWI
 115        /*
 116         * ANOMALY_05000364
 117         * Incorrect Revision Number in DSPID Register
 118         */
 119        if (ANOMALY_05000364 &&
 120            bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI) == 0x2796)
 121                revid = 1;
 122#endif
 123
 124        return revid;
 125}
 126
 127static inline uint16_t __pure bfin_cpuid(void)
 128{
 129        return (bfin_read_CHIPID() & CHIPID_FAMILY) >> 12;
 130}
 131
 132static inline uint32_t __pure bfin_dspid(void)
 133{
 134        return bfin_read_DSPID();
 135}
 136
 137static inline uint32_t __pure bfin_compiled_revid(void)
 138{
 139#if defined(CONFIG_BF_REV_0_0)
 140        return 0;
 141#elif defined(CONFIG_BF_REV_0_1)
 142        return 1;
 143#elif defined(CONFIG_BF_REV_0_2)
 144        return 2;
 145#elif defined(CONFIG_BF_REV_0_3)
 146        return 3;
 147#elif defined(CONFIG_BF_REV_0_4)
 148        return 4;
 149#elif defined(CONFIG_BF_REV_0_5)
 150        return 5;
 151#elif defined(CONFIG_BF_REV_0_6)
 152        return 6;
 153#elif defined(CONFIG_BF_REV_ANY)
 154        return 0xffff;
 155#else
 156        return -1;
 157#endif
 158}
 159
 160#endif
 161