1 /*
2  * linux/arch/unicore32/include/asm/processor.h
3  *
4  * Code specific to PKUnity SoC and UniCore ISA
5  *
6  * Copyright (C) 2001-2010 GUAN Xue-tao
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12 
13 #ifndef __UNICORE_PROCESSOR_H__
14 #define __UNICORE_PROCESSOR_H__
15 
16 /*
17  * Default implementation of macro that returns current
18  * instruction pointer ("program counter").
19  */
20 #define current_text_addr() ({ __label__ _l; _l: &&_l; })
21 
22 #ifdef __KERNEL__
23 
24 #include <asm/ptrace.h>
25 #include <asm/types.h>
26 
27 #ifdef __KERNEL__
28 #define STACK_TOP	TASK_SIZE
29 #define STACK_TOP_MAX	TASK_SIZE
30 #endif
31 
32 struct debug_entry {
33 	u32			address;
34 	u32			insn;
35 };
36 
37 struct debug_info {
38 	int			nsaved;
39 	struct debug_entry	bp[2];
40 };
41 
42 struct thread_struct {
43 							/* fault info	  */
44 	unsigned long		address;
45 	unsigned long		trap_no;
46 	unsigned long		error_code;
47 							/* debugging	  */
48 	struct debug_info	debug;
49 };
50 
51 #define INIT_THREAD  {	}
52 
53 #define start_thread(regs, pc, sp)					\
54 ({									\
55 	unsigned long *stack = (unsigned long *)sp;			\
56 	memset(regs->uregs, 0, sizeof(regs->uregs));			\
57 	regs->UCreg_asr = USER_MODE;					\
58 	regs->UCreg_pc = pc & ~1;	/* pc */                        \
59 	regs->UCreg_sp = sp;		/* sp */                        \
60 	regs->UCreg_02 = stack[2];	/* r2 (envp) */                 \
61 	regs->UCreg_01 = stack[1];	/* r1 (argv) */                 \
62 	regs->UCreg_00 = stack[0];	/* r0 (argc) */                 \
63 })
64 
65 /* Forward declaration, a strange C thing */
66 struct task_struct;
67 
68 /* Free all resources held by a thread. */
69 extern void release_thread(struct task_struct *);
70 
71 /* Prepare to copy thread state - unlazy all lazy status */
72 #define prepare_to_copy(tsk)	do { } while (0)
73 
74 unsigned long get_wchan(struct task_struct *p);
75 
76 #define cpu_relax()			barrier()
77 
78 /*
79  * Create a new kernel thread
80  */
81 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
82 
83 #define task_pt_regs(p) \
84 	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
85 
86 #define KSTK_EIP(tsk)	(task_pt_regs(tsk)->UCreg_pc)
87 #define KSTK_ESP(tsk)	(task_pt_regs(tsk)->UCreg_sp)
88 
89 #endif
90 
91 #endif /* __UNICORE_PROCESSOR_H__ */
92