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