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Linux/arch/blackfin/include/asm/processor.h

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  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 <mach/blackfin.h>
 18 
 19 static 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 
 27 static inline void wrusp(unsigned long usp)
 28 {
 29         __asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
 30 }
 31 
 32 static 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 
 53 struct 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 
 67 extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
 68                                                unsigned long new_sp);
 69 
 70 /* Forward declaration, a strange C thing */
 71 struct task_struct;
 72 
 73 /* Free all resources held by a thread. */
 74 static inline void release_thread(struct task_struct *dead_task)
 75 {
 76 }
 77 
 78 /*
 79  * Return saved PC of a blocked thread.
 80  */
 81 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 82 
 83 unsigned long get_wchan(struct task_struct *p);
 84 
 85 #define KSTK_EIP(tsk)                                                   \
 86     ({                                                                  \
 87         unsigned long eip = 0;                                          \
 88         if ((tsk)->thread.esp0 > PAGE_SIZE &&                           \
 89             MAP_NR((tsk)->thread.esp0) < max_mapnr)                     \
 90               eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc;        \
 91         eip; })
 92 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
 93 
 94 #define cpu_relax()     smp_mb()
 95 #define cpu_relax_lowlatency() cpu_relax()
 96 
 97 /* Get the Silicon Revision of the chip */
 98 static inline uint32_t __pure bfin_revid(void)
 99 {
100         /* Always use CHIPID, to work around ANOMALY_05000234 */
101         uint32_t revid = (bfin_read_CHIPID() & CHIPID_VERSION) >> 28;
102 
103 #ifdef _BOOTROM_GET_DXE_ADDRESS_TWI
104         /*
105          * ANOMALY_05000364
106          * Incorrect Revision Number in DSPID Register
107          */
108         if (ANOMALY_05000364 &&
109             bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI) == 0x2796)
110                 revid = 1;
111 #endif
112 
113         return revid;
114 }
115 
116 static inline uint16_t __pure bfin_cpuid(void)
117 {
118         return (bfin_read_CHIPID() & CHIPID_FAMILY) >> 12;
119 }
120 
121 static inline uint32_t __pure bfin_dspid(void)
122 {
123         return bfin_read_DSPID();
124 }
125 
126 #define blackfin_core_id() (bfin_dspid() & 0xff)
127 
128 static inline uint32_t __pure bfin_compiled_revid(void)
129 {
130 #if defined(CONFIG_BF_REV_0_0)
131         return 0;
132 #elif defined(CONFIG_BF_REV_0_1)
133         return 1;
134 #elif defined(CONFIG_BF_REV_0_2)
135         return 2;
136 #elif defined(CONFIG_BF_REV_0_3)
137         return 3;
138 #elif defined(CONFIG_BF_REV_0_4)
139         return 4;
140 #elif defined(CONFIG_BF_REV_0_5)
141         return 5;
142 #elif defined(CONFIG_BF_REV_0_6)
143         return 6;
144 #elif defined(CONFIG_BF_REV_ANY)
145         return 0xffff;
146 #else
147         return -1;
148 #endif
149 }
150 
151 #endif
152 

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