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