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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 extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
79 
80 /*
81  * Free current thread data structures etc..
82  */
83 static inline void exit_thread(void)
84 {
85 }
86 
87 /*
88  * Return saved PC of a blocked thread.
89  */
90 #define thread_saved_pc(tsk) (tsk->thread.pc)
91 
92 unsigned long get_wchan(struct task_struct *p);
93 
94 #define KSTK_EIP(tsk) \
95  ({ \
96  unsigned long eip = 0; \
97  if ((tsk)->thread.esp0 > PAGE_SIZE && \
98  MAP_NR((tsk)->thread.esp0) < max_mapnr) \
99  eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
100  eip; })
101 #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
102 
103 #define cpu_relax() smp_mb()
104 
105 
106 /* Get the Silicon Revision of the chip */
107 static inline uint32_t __pure bfin_revid(void)
108 {
109  /* Always use CHIPID, to work around ANOMALY_05000234 */
110  uint32_t revid = (bfin_read_CHIPID() & CHIPID_VERSION) >> 28;
111 
112 #ifdef _BOOTROM_GET_DXE_ADDRESS_TWI
113  /*
114  * ANOMALY_05000364
115  * Incorrect Revision Number in DSPID Register
116  */
117  if (ANOMALY_05000364 &&
119  revid = 1;
120 #endif
121 
122  return revid;
123 }
124 
125 static inline uint16_t __pure bfin_cpuid(void)
126 {
127  return (bfin_read_CHIPID() & CHIPID_FAMILY) >> 12;
128 }
129 
130 static inline uint32_t __pure bfin_dspid(void)
131 {
132  return bfin_read_DSPID();
133 }
134 
135 #define blackfin_core_id() (bfin_dspid() & 0xff)
136 
137 static 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