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 unsigned long get_wchan(struct task_struct *p);
79
80 #define KSTK_EIP(tsk) \
81 ({ \
82 unsigned long eip = 0; \
83 if ((tsk)->thread.esp0 > PAGE_SIZE && \
84 MAP_NR((tsk)->thread.esp0) < max_mapnr) \
85 eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
86 eip; })
87 #define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
88
89 #define cpu_relax() smp_mb()
90
91 /* Get the Silicon Revision of the chip */
92 static inline uint32_t __pure bfin_revid(void)
93 {
94 /* Always use CHIPID, to work around ANOMALY_05000234 */
95 uint32_t revid = (bfin_read_CHIPID() & CHIPID_VERSION) >> 28;
96
97 #ifdef _BOOTROM_GET_DXE_ADDRESS_TWI
98 /*
99 * ANOMALY_05000364
100 * Incorrect Revision Number in DSPID Register
101 */
102 if (ANOMALY_05000364 &&
103 bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI) == 0x2796)
104 revid = 1;
105 #endif
106
107 return revid;
108 }
109
110 static inline uint16_t __pure bfin_cpuid(void)
111 {
112 return (bfin_read_CHIPID() & CHIPID_FAMILY) >> 12;
113 }
114
115 static inline uint32_t __pure bfin_dspid(void)
116 {
117 return bfin_read_DSPID();
118 }
119
120 #define blackfin_core_id() (bfin_dspid() & 0xff)
121
122 static inline uint32_t __pure bfin_compiled_revid(void)
123 {
124 #if defined(CONFIG_BF_REV_0_0)
125 return 0;
126 #elif defined(CONFIG_BF_REV_0_1)
127 return 1;
128 #elif defined(CONFIG_BF_REV_0_2)
129 return 2;
130 #elif defined(CONFIG_BF_REV_0_3)
131 return 3;
132 #elif defined(CONFIG_BF_REV_0_4)
133 return 4;
134 #elif defined(CONFIG_BF_REV_0_5)
135 return 5;
136 #elif defined(CONFIG_BF_REV_0_6)
137 return 6;
138 #elif defined(CONFIG_BF_REV_ANY)
139 return 0xffff;
140 #else
141 return -1;
142 #endif
143 }
144
145 #endif
146
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