1 #ifndef _ASM_SCORE_PROCESSOR_H
2 #define _ASM_SCORE_PROCESSOR_H
3 
4 #include <linux/cpumask.h>
5 #include <linux/threads.h>
6 
7 #include <asm/segment.h>
8 
9 struct task_struct;
10 
11 /*
12  * System setup and hardware flags..
13  */
14 extern void (*cpu_wait)(void);
15 
16 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
17 extern unsigned long thread_saved_pc(struct task_struct *tsk);
18 extern void start_thread(struct pt_regs *regs,
19 			unsigned long pc, unsigned long sp);
20 extern unsigned long get_wchan(struct task_struct *p);
21 
22 /*
23  * Return current * instruction pointer ("program counter").
24  */
25 #define current_text_addr() ({ __label__ _l; _l: &&_l; })
26 
27 #define cpu_relax()		barrier()
28 #define release_thread(thread)	do {} while (0)
29 #define prepare_to_copy(tsk)	do {} while (0)
30 
31 /*
32  * User space process size: 2GB. This is hardcoded into a few places,
33  * so don't change it unless you know what you are doing.
34  */
35 #define TASK_SIZE	0x7fff8000UL
36 
37 /*
38  * This decides where the kernel will search for a free chunk of vm
39  * space during mmap's.
40  */
41 #define TASK_UNMAPPED_BASE	((TASK_SIZE / 3) & ~(PAGE_SIZE))
42 
43 #ifdef __KERNEL__
44 #define STACK_TOP	TASK_SIZE
45 #define STACK_TOP_MAX	TASK_SIZE
46 #endif
47 
48 /*
49  * If you change thread_struct remember to change the #defines below too!
50  */
51 struct thread_struct {
52 	unsigned long reg0, reg2, reg3;
53 	unsigned long reg12, reg13, reg14, reg15, reg16;
54 	unsigned long reg17, reg18, reg19, reg20, reg21;
55 
56 	unsigned long cp0_psr;
57 	unsigned long cp0_ema;		/* Last user fault */
58 	unsigned long cp0_badvaddr;	/* Last user fault */
59 	unsigned long cp0_baduaddr;	/* Last kernel fault accessing USEG */
60 	unsigned long error_code;
61 	unsigned long trap_no;
62 
63 	unsigned long mflags;
64 	unsigned long reg29;
65 
66 	unsigned long single_step;
67 	unsigned long ss_nextcnt;
68 
69 	unsigned long insn1_type;
70 	unsigned long addr1;
71 	unsigned long insn1;
72 
73 	unsigned long insn2_type;
74 	unsigned long addr2;
75 	unsigned long insn2;
76 
77 	mm_segment_t current_ds;
78 };
79 
80 #define INIT_THREAD {						\
81 	.reg0			= 0,				\
82 	.reg2			= 0,				\
83 	.reg3			= 0,				\
84 	.reg12			= 0,				\
85 	.reg13			= 0,				\
86 	.reg14			= 0,				\
87 	.reg15			= 0,				\
88 	.reg16			= 0,				\
89 	.reg17			= 0,				\
90 	.reg18			= 0,				\
91 	.reg19			= 0,				\
92 	.reg20			= 0,				\
93 	.reg21			= 0,				\
94 	.cp0_psr		= 0,				\
95 	.error_code		= 0,				\
96 	.trap_no		= 0,				\
97 }
98 
99 #define kstk_tos(tsk)		\
100 	((unsigned long)task_stack_page(tsk) + THREAD_SIZE - 32)
101 #define task_pt_regs(tsk)	((struct pt_regs *)kstk_tos(tsk) - 1)
102 
103 #define KSTK_EIP(tsk)		(task_pt_regs(tsk)->cp0_epc)
104 #define KSTK_ESP(tsk)		(task_pt_regs(tsk)->regs[29])
105 
106 #endif /* _ASM_SCORE_PROCESSOR_H */
107