arch/blackfin/include/asm/processor.h

   1 #ifndef __ASM_BFIN_PROCESSOR_H
   2 #define __ASM_BFIN_PROCESSOR_H
   3
   4 /*
   5  * Default implementation of macro that returns current
   6  * instruction pointer ("program counter").
   7  */
   8 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
   9
  10 #include <asm/blackfin.h>
  11 #include <asm/segment.h>
  12 #include <linux/compiler.h>
  13
  14 static inline unsigned long rdusp(void)
  15 {
  16         unsigned long usp;
  17
  18         __asm__ __volatile__("%0 = usp;\n\t":"=da"(usp));
  19         return usp;
  20 }
  21
  22 static inline void wrusp(unsigned long usp)
  23 {
  24         __asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
  25 }
  26
  27 static inline unsigned long __get_SP(void)
  28 {
  29         unsigned long sp;
  30
  31         __asm__ __volatile__("%0 = sp;\n\t" : "=da"(sp));
  32         return sp;
  33 }
  34
  35 /*
  36  * User space process size: 1st byte beyond user address space.
  37  * Fairly meaningless on nommu.  Parts of user programs can be scattered
  38  * in a lot of places, so just disable this by setting it to 0xFFFFFFFF.
  39  */
  40 #define TASK_SIZE       0xFFFFFFFF
  41
  42 #ifdef __KERNEL__
  43 #define STACK_TOP       TASK_SIZE
  44 #endif
  45
  46 #define TASK_UNMAPPED_BASE      0
  47
  48 struct thread_struct {
  49         unsigned long ksp;      /* kernel stack pointer */
  50         unsigned long usp;      /* user stack pointer */
  51         unsigned short seqstat; /* saved status register */
  52         unsigned long esp0;     /* points to SR of stack frame pt_regs */
  53         unsigned long pc;       /* instruction pointer */
  54         void *        debuggerinfo;
  55 };
  56
  57 #define INIT_THREAD  {                                          \
  58         sizeof(init_stack) + (unsigned long) init_stack, 0,     \
  59         PS_S, 0, 0                                              \
  60 }
  61
  62 /*
  63  * Do necessary setup to start up a newly executed thread.
  64  *
  65  * pass the data segment into user programs if it exists,
  66  * it can't hurt anything as far as I can tell
  67  */
  68 #define start_thread(_regs, _pc, _usp)                                  \
  69 do {                                                                    \
  70         set_fs(USER_DS);                                                \
  71         (_regs)->pc = (_pc);                                            \
  72         if (current->mm)                                                \
  73                 (_regs)->p5 = current->mm->start_data;                  \
  74         task_thread_info(current)->l1_task_info.stack_start             \
  75                 = (void *)current->mm->context.stack_start;             \
  76         task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \
  77         memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \
  78                 sizeof(*L1_SCRATCH_TASK_INFO));                         \
  79         wrusp(_usp);                                                    \
  80 } while(0)
  81
  82 /* Forward declaration, a strange C thing */
  83 struct task_struct;
  84
  85 /* Free all resources held by a thread. */
  86 static inline void release_thread(struct task_struct *dead_task)
  87 {
  88 }
  89
  90 #define prepare_to_copy(tsk)    do { } while (0)
  91
  92 extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
  93
  94 /*
  95  * Free current thread data structures etc..
  96  */
  97 static inline void exit_thread(void)
  98 {
  99 }
 100
 101 /*
 102  * Return saved PC of a blocked thread.
 103  */
 104 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 105
 106 unsigned long get_wchan(struct task_struct *p);
 107
 108 #define KSTK_EIP(tsk)                                                   \
 109     ({                                                                  \
 110         unsigned long eip = 0;                                          \
 111         if ((tsk)->thread.esp0 > PAGE_SIZE &&                           \
 112             MAP_NR((tsk)->thread.esp0) < max_mapnr)                     \
 113               eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc;        \
 114         eip; })
 115 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
 116
 117 #define cpu_relax()     smp_mb()
 118
 119
 120 /* Get the Silicon Revision of the chip */
 121 static inline uint32_t __pure bfin_revid(void)
 122 {
 123         /* stored in the upper 4 bits */
 124         uint32_t revid = bfin_read_CHIPID() >> 28;
 125
 126 #ifdef CONFIG_BF52x
 127         /* ANOMALY_05000357
 128          * Incorrect Revision Number in DSPID Register
 129          */
 130         if (revid == 0)
 131                 switch (bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI)) {
 132                 case 0x0010:
 133                         revid = 0;
 134                         break;
 135                 case 0x2796:
 136                         revid = 1;
 137                         break;
 138                 default:
 139                         revid = 0xFFFF;
 140                         break;
 141                 }
 142 #endif
 143         return revid;
 144 }
 145
 146 static inline uint16_t __pure bfin_cpuid(void)
 147 {
 148         return (bfin_read_CHIPID() & CHIPID_FAMILY) >> 12;
 149 }
 150
 151 static inline uint32_t __pure bfin_dspid(void)
 152 {
 153         return bfin_read_DSPID();
 154 }
 155
 156 static inline uint32_t __pure bfin_compiled_revid(void)
 157 {
 158 #if defined(CONFIG_BF_REV_0_0)
 159         return 0;
 160 #elif defined(CONFIG_BF_REV_0_1)
 161         return 1;
 162 #elif defined(CONFIG_BF_REV_0_2)
 163         return 2;
 164 #elif defined(CONFIG_BF_REV_0_3)
 165         return 3;
 166 #elif defined(CONFIG_BF_REV_0_4)
 167         return 4;
 168 #elif defined(CONFIG_BF_REV_0_5)
 169         return 5;
 170 #elif defined(CONFIG_BF_REV_0_6)
 171         return 6;
 172 #elif defined(CONFIG_BF_REV_ANY)
 173         return 0xffff;
 174 #else
 175         return -1;
 176 #endif
 177 }
 178
 179 #endif