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Bryan Wu1394f032007-05-06 14:50:22 -07001#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
14static 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
22static 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 */
30extern unsigned long memory_end;
31#define TASK_SIZE (memory_end)
32
33#define TASK_UNMAPPED_BASE 0
34
35struct thread_struct {
36 unsigned long ksp; /* kernel stack pointer */
37 unsigned long usp; /* user stack pointer */
38 unsigned short seqstat; /* saved status register */
39 unsigned long esp0; /* points to SR of stack frame pt_regs */
40 unsigned long pc; /* instruction pointer */
41 void * debuggerinfo;
42};
43
44#define INIT_THREAD { \
45 sizeof(init_stack) + (unsigned long) init_stack, 0, \
46 PS_S, 0, 0 \
47}
48
49/*
50 * Do necessary setup to start up a newly executed thread.
51 *
52 * pass the data segment into user programs if it exists,
53 * it can't hurt anything as far as I can tell
54 */
55#define start_thread(_regs, _pc, _usp) \
56do { \
57 set_fs(USER_DS); \
58 (_regs)->pc = (_pc); \
59 if (current->mm) \
60 (_regs)->p5 = current->mm->start_data; \
Roman Zippelf7e42172007-05-09 02:35:17 -070061 task_thread_info(current)->l1_task_info.stack_start \
Bryan Wu1394f032007-05-06 14:50:22 -070062 = (void *)current->mm->context.stack_start; \
Roman Zippelf7e42172007-05-09 02:35:17 -070063 task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \
64 memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \
Bryan Wu1394f032007-05-06 14:50:22 -070065 sizeof(*L1_SCRATCH_TASK_INFO)); \
66 wrusp(_usp); \
67} while(0)
68
69/* Forward declaration, a strange C thing */
70struct task_struct;
71
72/* Free all resources held by a thread. */
73static inline void release_thread(struct task_struct *dead_task)
74{
75}
76
77#define prepare_to_copy(tsk) do { } while (0)
78
79extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
80
81/*
82 * Free current thread data structures etc..
83 */
84static inline void exit_thread(void)
85{
86}
87
88/*
89 * Return saved PC of a blocked thread.
90 */
91#define thread_saved_pc(tsk) (tsk->thread.pc)
92
93unsigned long get_wchan(struct task_struct *p);
94
95#define KSTK_EIP(tsk) \
96 ({ \
97 unsigned long eip = 0; \
98 if ((tsk)->thread.esp0 > PAGE_SIZE && \
99 MAP_NR((tsk)->thread.esp0) < max_mapnr) \
100 eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
101 eip; })
102#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
103
104#define cpu_relax() barrier()
105
106/* Get the Silicon Revision of the chip */
107static inline uint32_t bfin_revid(void)
108{
109 /* stored in the upper 4 bits */
110 return bfin_read_CHIPID() >> 28;
111}
112
113static inline uint32_t bfin_compiled_revid(void)
114{
115#if defined(CONFIG_BF_REV_0_0)
116 return 0;
117#elif defined(CONFIG_BF_REV_0_1)
118 return 1;
119#elif defined(CONFIG_BF_REV_0_2)
120 return 2;
121#elif defined(CONFIG_BF_REV_0_3)
122 return 3;
123#elif defined(CONFIG_BF_REV_0_4)
124 return 4;
125#elif defined(CONFIG_BF_REV_0_5)
126 return 5;
127#endif
128}
129
130#endif