include/asm-blackfin/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 /*
  28  * User space process size: 1st byte beyond user address space.
  29  */
  30 extern unsigned long memory_end;
  31 #define TASK_SIZE       (memory_end)
  32
  33 #ifdef __KERNEL__
  34 #define STACK_TOP       TASK_SIZE
  35 #endif
  36
  37 #define TASK_UNMAPPED_BASE      0
  38
  39 struct thread_struct {
  40         unsigned long ksp;      /* kernel stack pointer */
  41         unsigned long usp;      /* user stack pointer */
  42         unsigned short seqstat; /* saved status register */
  43         unsigned long esp0;     /* points to SR of stack frame pt_regs */
  44         unsigned long pc;       /* instruction pointer */
  45         void *        debuggerinfo;
  46 };
  47
  48 #define INIT_THREAD  {                                          \
  49         sizeof(init_stack) + (unsigned long) init_stack, 0,     \
  50         PS_S, 0, 0                                              \
  51 }
  52
  53 /*
  54  * Do necessary setup to start up a newly executed thread.
  55  *
  56  * pass the data segment into user programs if it exists,
  57  * it can't hurt anything as far as I can tell
  58  */
  59 #define start_thread(_regs, _pc, _usp)                                  \
  60 do {                                                                    \
  61         set_fs(USER_DS);                                                \
  62         (_regs)->pc = (_pc);                                            \
  63         if (current->mm)                                                \
  64                 (_regs)->p5 = current->mm->start_data;                  \
  65         task_thread_info(current)->l1_task_info.stack_start             \
  66                 = (void *)current->mm->context.stack_start;             \
  67         task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \
  68         memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \
  69                 sizeof(*L1_SCRATCH_TASK_INFO));                         \
  70         wrusp(_usp);                                                    \
  71 } while(0)
  72
  73 /* Forward declaration, a strange C thing */
  74 struct task_struct;
  75
  76 /* Free all resources held by a thread. */
  77 static inline void release_thread(struct task_struct *dead_task)
  78 {
  79 }
  80
  81 #define prepare_to_copy(tsk)    do { } while (0)
  82
  83 extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
  84
  85 /*
  86  * Free current thread data structures etc..
  87  */
  88 static inline void exit_thread(void)
  89 {
  90 }
  91
  92 /*
  93  * Return saved PC of a blocked thread.
  94  */
  95 #define thread_saved_pc(tsk)    (tsk->thread.pc)
  96
  97 unsigned long get_wchan(struct task_struct *p);
  98
  99 #define KSTK_EIP(tsk)                                                   \
 100     ({                                                                  \
 101         unsigned long eip = 0;                                          \
 102         if ((tsk)->thread.esp0 > PAGE_SIZE &&                           \
 103             MAP_NR((tsk)->thread.esp0) < max_mapnr)                     \
 104               eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc;        \
 105         eip; })
 106 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
 107
 108 #define cpu_relax()     barrier()
 109
 110 /* Get the Silicon Revision of the chip */
 111 static inline uint32_t __pure bfin_revid(void)
 112 {
 113         /* stored in the upper 4 bits */
 114         return bfin_read_CHIPID() >> 28;
 115 }
 116
 117 static inline uint32_t __pure bfin_compiled_revid(void)
 118 {
 119 #if defined(CONFIG_BF_REV_0_0)
 120         return 0;
 121 #elif defined(CONFIG_BF_REV_0_1)
 122         return 1;
 123 #elif defined(CONFIG_BF_REV_0_2)
 124         return 2;
 125 #elif defined(CONFIG_BF_REV_0_3)
 126         return 3;
 127 #elif defined(CONFIG_BF_REV_0_4)
 128         return 4;
 129 #elif defined(CONFIG_BF_REV_0_5)
 130         return 5;
 131 #elif defined(CONFIG_BF_REV_ANY)
 132         return 0xffff;
 133 #else
 134         return -1;
 135 #endif
 136 }
 137
 138 #endif