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