1 /* include/asm/processor.h
2  *
3  * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
4  */
5 
6 #ifndef __ASM_SPARC_PROCESSOR_H
7 #define __ASM_SPARC_PROCESSOR_H
8 
9 /*
10  * Sparc32 implementation of macro that returns current
11  * instruction pointer ("program counter").
12  */
13 #define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
14 
15 #include <asm/psr.h>
16 #include <asm/ptrace.h>
17 #include <asm/head.h>
18 #include <asm/signal.h>
19 #include <asm/page.h>
20 
21 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
22  * That one page is used to protect kernel from intruders, so that
23  * we can make our access_ok test faster
24  */
25 #define TASK_SIZE	PAGE_OFFSET
26 #ifdef __KERNEL__
27 #define STACK_TOP	(PAGE_OFFSET - PAGE_SIZE)
28 #define STACK_TOP_MAX	STACK_TOP
29 #endif /* __KERNEL__ */
30 
31 struct task_struct;
32 
33 #ifdef __KERNEL__
34 struct fpq {
35 	unsigned long *insn_addr;
36 	unsigned long insn;
37 };
38 #endif
39 
40 typedef struct {
41 	int seg;
42 } mm_segment_t;
43 
44 /* The Sparc processor specific thread struct. */
45 struct thread_struct {
46 	struct pt_regs *kregs;
47 	unsigned int _pad1;
48 
49 	/* Special child fork kpsr/kwim values. */
50 	unsigned long fork_kpsr __attribute__ ((aligned (8)));
51 	unsigned long fork_kwim;
52 
53 	/* Floating point regs */
54 	unsigned long   float_regs[32] __attribute__ ((aligned (8)));
55 	unsigned long   fsr;
56 	unsigned long   fpqdepth;
57 	struct fpq	fpqueue[16];
58 	unsigned long flags;
59 	mm_segment_t current_ds;
60 };
61 
62 #define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
63 #define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
64 
65 #define INIT_THREAD  { \
66 	.flags = SPARC_FLAG_KTHREAD, \
67 	.current_ds = KERNEL_DS, \
68 }
69 
70 /* Return saved PC of a blocked thread. */
71 unsigned long thread_saved_pc(struct task_struct *t);
72 
73 /* Do necessary setup to start up a newly executed thread. */
74 static inline void start_thread(struct pt_regs * regs, unsigned long pc,
75 				    unsigned long sp)
76 {
77 	register unsigned long zero asm("g1");
78 
79 	regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
80 	regs->pc = ((pc & (~3)) - 4);
81 	regs->npc = regs->pc + 4;
82 	regs->y = 0;
83 	zero = 0;
84 	__asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
85 			     "std\t%%g0, [%0 + %3 + 0x08]\n\t"
86 			     "std\t%%g0, [%0 + %3 + 0x10]\n\t"
87 			     "std\t%%g0, [%0 + %3 + 0x18]\n\t"
88 			     "std\t%%g0, [%0 + %3 + 0x20]\n\t"
89 			     "std\t%%g0, [%0 + %3 + 0x28]\n\t"
90 			     "std\t%%g0, [%0 + %3 + 0x30]\n\t"
91 			     "st\t%1, [%0 + %3 + 0x38]\n\t"
92 			     "st\t%%g0, [%0 + %3 + 0x3c]"
93 			     : /* no outputs */
94 			     : "r" (regs),
95 			       "r" (sp - sizeof(struct reg_window32)),
96 			       "r" (zero),
97 			       "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
98 			     : "memory");
99 }
100 
101 /* Free all resources held by a thread. */
102 #define release_thread(tsk)		do { } while(0)
103 
104 unsigned long get_wchan(struct task_struct *);
105 
106 #define task_pt_regs(tsk) ((tsk)->thread.kregs)
107 #define KSTK_EIP(tsk)  ((tsk)->thread.kregs->pc)
108 #define KSTK_ESP(tsk)  ((tsk)->thread.kregs->u_regs[UREG_FP])
109 
110 #ifdef __KERNEL__
111 
112 extern struct task_struct *last_task_used_math;
113 int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
114 
115 #define cpu_relax()	barrier()
116 
117 extern void (*sparc_idle)(void);
118 
119 #endif
120 
121 #endif /* __ASM_SPARC_PROCESSOR_H */
122