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
32struct debug_entry {
33	u32			address;
34	u32			insn;
35};
36
37struct debug_info {
38	int			nsaved;
39	struct debug_entry	bp[2];
40};
41
42struct 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 */
66struct task_struct;
67
68/* Free all resources held by a thread. */
69extern void release_thread(struct task_struct *);
70
71unsigned long get_wchan(struct task_struct *p);
72
73#define cpu_relax()			barrier()
74#define cpu_relax_lowlatency()                cpu_relax()
75
76#define task_pt_regs(p) \
77	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
78
79#define KSTK_EIP(tsk)	(task_pt_regs(tsk)->UCreg_pc)
80#define KSTK_ESP(tsk)	(task_pt_regs(tsk)->UCreg_sp)
81
82#endif
83
84#endif /* __UNICORE_PROCESSOR_H__ */
85