Linux kernel mirror (for testing)
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linux
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
60/*
61 * DSP structure and data
62 */
63struct sh_dsp_struct {
64 unsigned long dsp_regs[14];
65 long status;
66};
67
68/*
69 * FPU structure and data
70 */
71
72struct sh_fpu_hard_struct {
73 unsigned long fp_regs[16];
74 unsigned long xfp_regs[16];
75 unsigned long fpscr;
76 unsigned long fpul;
77
78 long status; /* software status information */
79};
80
81/* Dummy fpu emulator */
82struct sh_fpu_soft_struct {
83 unsigned long fp_regs[16];
84 unsigned long xfp_regs[16];
85 unsigned long fpscr;
86 unsigned long fpul;
87
88 unsigned char lookahead;
89 unsigned long entry_pc;
90};
91
92union sh_fpu_union {
93 struct sh_fpu_hard_struct hard;
94 struct sh_fpu_soft_struct soft;
95};
96
97struct thread_struct {
98 /* Saved registers when thread is descheduled */
99 unsigned long sp;
100 unsigned long pc;
101
102 /* Hardware debugging registers */
103 unsigned long ubc_pc;
104
105 /* floating point info */
106 union sh_fpu_union fpu;
107
108#ifdef CONFIG_SH_DSP
109 /* Dsp status information */
110 struct sh_dsp_struct dsp_status;
111#endif
112};
113
114/* Count of active tasks with UBC settings */
115extern int ubc_usercnt;
116
117#define INIT_THREAD { \
118 .sp = sizeof(init_stack) + (long) &init_stack, \
119}
120
121/*
122 * Do necessary setup to start up a newly executed thread.
123 */
124#define start_thread(_regs, new_pc, new_sp) \
125 set_fs(USER_DS); \
126 _regs->pr = 0; \
127 _regs->sr = SR_FD; /* User mode. */ \
128 _regs->pc = new_pc; \
129 _regs->regs[15] = new_sp
130
131/* Forward declaration, a strange C thing */
132struct task_struct;
133struct mm_struct;
134
135/* Free all resources held by a thread. */
136extern void release_thread(struct task_struct *);
137
138/* Prepare to copy thread state - unlazy all lazy status */
139#define prepare_to_copy(tsk) do { } while (0)
140
141/*
142 * create a kernel thread without removing it from tasklists
143 */
144extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
145
146/* Copy and release all segment info associated with a VM */
147#define copy_segments(p, mm) do { } while(0)
148#define release_segments(mm) do { } while(0)
149
150/*
151 * FPU lazy state save handling.
152 */
153
154static __inline__ void disable_fpu(void)
155{
156 unsigned long __dummy;
157
158 /* Set FD flag in SR */
159 __asm__ __volatile__("stc sr, %0\n\t"
160 "or %1, %0\n\t"
161 "ldc %0, sr"
162 : "=&r" (__dummy)
163 : "r" (SR_FD));
164}
165
166static __inline__ void enable_fpu(void)
167{
168 unsigned long __dummy;
169
170 /* Clear out FD flag in SR */
171 __asm__ __volatile__("stc sr, %0\n\t"
172 "and %1, %0\n\t"
173 "ldc %0, sr"
174 : "=&r" (__dummy)
175 : "r" (~SR_FD));
176}
177
178/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
179#define FPSCR_INIT 0x00080000
180
181#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
182#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
183
184/*
185 * Return saved PC of a blocked thread.
186 */
187#define thread_saved_pc(tsk) (tsk->thread.pc)
188
189void show_trace(struct task_struct *tsk, unsigned long *sp,
190 struct pt_regs *regs);
191
192#ifdef CONFIG_DUMP_CODE
193void show_code(struct pt_regs *regs);
194#else
195static inline void show_code(struct pt_regs *regs)
196{
197}
198#endif
199
200extern unsigned long get_wchan(struct task_struct *p);
201
202#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
203#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
204
205#define user_stack_pointer(_regs) ((_regs)->regs[15])
206
207#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
208#define PREFETCH_STRIDE L1_CACHE_BYTES
209#define ARCH_HAS_PREFETCH
210#define ARCH_HAS_PREFETCHW
211static inline void prefetch(void *x)
212{
213 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
214}
215
216#define prefetchw(x) prefetch(x)
217#endif
218
219#endif /* __KERNEL__ */
220#endif /* __ASM_SH_PROCESSOR_32_H */