Linux kernel mirror (for testing)
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1/*
2 * include/asm-sh/processor.h
3 *
4 * Copyright (C) 1999, 2000 Niibe Yutaka
5 * Copyright (C) 2002, 2003 Paul Mundt
6 */
7
8#ifndef __ASM_SH_PROCESSOR_32_H
9#define __ASM_SH_PROCESSOR_32_H
10#ifdef __KERNEL__
11
12#include <linux/compiler.h>
13#include <linux/linkage.h>
14#include <asm/page.h>
15#include <asm/types.h>
16#include <asm/ptrace.h>
17
18/*
19 * Default implementation of macro that returns current
20 * instruction pointer ("program counter").
21 */
22#define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n.align 2\n1:":"=z" (pc)); pc; })
23
24/* Core Processor Version Register */
25#define CCN_PVR 0xff000030
26#define CCN_CVR 0xff000040
27#define CCN_PRR 0xff000044
28
29asmlinkage void __init sh_cpu_init(void);
30
31/*
32 * User space process size: 2GB.
33 *
34 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
35 */
36#define TASK_SIZE 0x7c000000UL
37
38#define STACK_TOP TASK_SIZE
39#define STACK_TOP_MAX STACK_TOP
40
41/* This decides where the kernel will search for a free chunk of vm
42 * space during mmap's.
43 */
44#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
45
46/*
47 * Bit of SR register
48 *
49 * FD-bit:
50 * When it's set, it means the processor doesn't have right to use FPU,
51 * and it results exception when the floating operation is executed.
52 *
53 * IMASK-bit:
54 * Interrupt level mask
55 */
56#define SR_DSP 0x00001000
57#define SR_IMASK 0x000000f0
58#define SR_FD 0x00008000
59#define SR_MD 0x40000000
60
61/*
62 * DSP structure and data
63 */
64struct sh_dsp_struct {
65 unsigned long dsp_regs[14];
66 long status;
67};
68
69/*
70 * FPU structure and data
71 */
72
73struct sh_fpu_hard_struct {
74 unsigned long fp_regs[16];
75 unsigned long xfp_regs[16];
76 unsigned long fpscr;
77 unsigned long fpul;
78
79 long status; /* software status information */
80};
81
82/* Dummy fpu emulator */
83struct sh_fpu_soft_struct {
84 unsigned long fp_regs[16];
85 unsigned long xfp_regs[16];
86 unsigned long fpscr;
87 unsigned long fpul;
88
89 unsigned char lookahead;
90 unsigned long entry_pc;
91};
92
93union sh_fpu_union {
94 struct sh_fpu_hard_struct hard;
95 struct sh_fpu_soft_struct soft;
96};
97
98struct thread_struct {
99 /* Saved registers when thread is descheduled */
100 unsigned long sp;
101 unsigned long pc;
102
103 /* Hardware debugging registers */
104 unsigned long ubc_pc;
105
106 /* floating point info */
107 union sh_fpu_union fpu;
108
109#ifdef CONFIG_SH_DSP
110 /* Dsp status information */
111 struct sh_dsp_struct dsp_status;
112#endif
113};
114
115/* Count of active tasks with UBC settings */
116extern int ubc_usercnt;
117
118#define INIT_THREAD { \
119 .sp = sizeof(init_stack) + (long) &init_stack, \
120}
121
122/*
123 * Do necessary setup to start up a newly executed thread.
124 */
125#define start_thread(_regs, new_pc, new_sp) \
126 set_fs(USER_DS); \
127 _regs->pr = 0; \
128 _regs->sr = SR_FD; /* User mode. */ \
129 _regs->pc = new_pc; \
130 _regs->regs[15] = new_sp
131
132/* Forward declaration, a strange C thing */
133struct task_struct;
134struct mm_struct;
135
136/* Free all resources held by a thread. */
137extern void release_thread(struct task_struct *);
138
139/* Prepare to copy thread state - unlazy all lazy status */
140void prepare_to_copy(struct task_struct *tsk);
141
142/*
143 * create a kernel thread without removing it from tasklists
144 */
145extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
146
147/* Copy and release all segment info associated with a VM */
148#define copy_segments(p, mm) do { } while(0)
149#define release_segments(mm) do { } while(0)
150
151/*
152 * FPU lazy state save handling.
153 */
154
155static __inline__ void disable_fpu(void)
156{
157 unsigned long __dummy;
158
159 /* Set FD flag in SR */
160 __asm__ __volatile__("stc sr, %0\n\t"
161 "or %1, %0\n\t"
162 "ldc %0, sr"
163 : "=&r" (__dummy)
164 : "r" (SR_FD));
165}
166
167static __inline__ void enable_fpu(void)
168{
169 unsigned long __dummy;
170
171 /* Clear out FD flag in SR */
172 __asm__ __volatile__("stc sr, %0\n\t"
173 "and %1, %0\n\t"
174 "ldc %0, sr"
175 : "=&r" (__dummy)
176 : "r" (~SR_FD));
177}
178
179/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
180#define FPSCR_INIT 0x00080000
181
182#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
183#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
184
185/*
186 * Return saved PC of a blocked thread.
187 */
188#define thread_saved_pc(tsk) (tsk->thread.pc)
189
190void show_trace(struct task_struct *tsk, unsigned long *sp,
191 struct pt_regs *regs);
192
193#ifdef CONFIG_DUMP_CODE
194void show_code(struct pt_regs *regs);
195#else
196static inline void show_code(struct pt_regs *regs)
197{
198}
199#endif
200
201extern unsigned long get_wchan(struct task_struct *p);
202
203#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
204#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
205
206#define user_stack_pointer(_regs) ((_regs)->regs[15])
207
208#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
209#define PREFETCH_STRIDE L1_CACHE_BYTES
210#define ARCH_HAS_PREFETCH
211#define ARCH_HAS_PREFETCHW
212static inline void prefetch(void *x)
213{
214 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
215}
216
217#define prefetchw(x) prefetch(x)
218#endif
219
220#endif /* __KERNEL__ */
221#endif /* __ASM_SH_PROCESSOR_32_H */