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
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;			\
61	task_thread_info(current)->l1_task_info.stack_start		\
62		= (void *)current->mm->context.stack_start;		\
63	task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \
64	memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \
65		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 __attribute_pure__ uint32_t bfin_revid(void)
108{
109	/* stored in the upper 4 bits */
110	return bfin_read_CHIPID() >> 28;
111}
112
113static inline __attribute_pure__ 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#elif defined(CONFIG_BF_REV_ANY)
128	return 0xffff;
129#else
130	return -1;
131#endif
132}
133
134#endif
135