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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/hw_breakpoint.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
29/*
30 * User space process size: 2GB.
31 *
32 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
33 */
34#define TASK_SIZE 0x7c000000UL
35
36#define STACK_TOP TASK_SIZE
37#define STACK_TOP_MAX STACK_TOP
38
39/* This decides where the kernel will search for a free chunk of vm
40 * space during mmap's.
41 */
42#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
43
44/*
45 * Bit of SR register
46 *
47 * FD-bit:
48 * When it's set, it means the processor doesn't have right to use FPU,
49 * and it results exception when the floating operation is executed.
50 *
51 * IMASK-bit:
52 * Interrupt level mask
53 */
54#define SR_DSP 0x00001000
55#define SR_IMASK 0x000000f0
56#define SR_FD 0x00008000
57#define SR_MD 0x40000000
58
59/*
60 * DSP structure and data
61 */
62struct sh_dsp_struct {
63 unsigned long dsp_regs[14];
64 long status;
65};
66
67/*
68 * FPU structure and data
69 */
70
71struct sh_fpu_hard_struct {
72 unsigned long fp_regs[16];
73 unsigned long xfp_regs[16];
74 unsigned long fpscr;
75 unsigned long fpul;
76
77 long status; /* software status information */
78};
79
80/* Dummy fpu emulator */
81struct sh_fpu_soft_struct {
82 unsigned long fp_regs[16];
83 unsigned long xfp_regs[16];
84 unsigned long fpscr;
85 unsigned long fpul;
86
87 unsigned char lookahead;
88 unsigned long entry_pc;
89};
90
91union thread_xstate {
92 struct sh_fpu_hard_struct hardfpu;
93 struct sh_fpu_soft_struct softfpu;
94};
95
96struct thread_struct {
97 /* Saved registers when thread is descheduled */
98 unsigned long sp;
99 unsigned long pc;
100
101 /* Various thread flags, see SH_THREAD_xxx */
102 unsigned long flags;
103
104 /* Save middle states of ptrace breakpoints */
105 struct perf_event *ptrace_bps[HBP_NUM];
106
107#ifdef CONFIG_SH_DSP
108 /* Dsp status information */
109 struct sh_dsp_struct dsp_status;
110#endif
111
112 /* Extended processor state */
113 union thread_xstate *xstate;
114
115 /*
116 * fpu_counter contains the number of consecutive context switches
117 * that the FPU is used. If this is over a threshold, the lazy fpu
118 * saving becomes unlazy to save the trap. This is an unsigned char
119 * so that after 256 times the counter wraps and the behavior turns
120 * lazy again; this to deal with bursty apps that only use FPU for
121 * a short time
122 */
123 unsigned char fpu_counter;
124};
125
126#define INIT_THREAD { \
127 .sp = sizeof(init_stack) + (long) &init_stack, \
128 .flags = 0, \
129}
130
131/* Forward declaration, a strange C thing */
132struct task_struct;
133
134extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp);
135
136/* Free all resources held by a thread. */
137extern void release_thread(struct task_struct *);
138
139/*
140 * FPU lazy state save handling.
141 */
142
143static __inline__ void disable_fpu(void)
144{
145 unsigned long __dummy;
146
147 /* Set FD flag in SR */
148 __asm__ __volatile__("stc sr, %0\n\t"
149 "or %1, %0\n\t"
150 "ldc %0, sr"
151 : "=&r" (__dummy)
152 : "r" (SR_FD));
153}
154
155static __inline__ void enable_fpu(void)
156{
157 unsigned long __dummy;
158
159 /* Clear out FD flag in SR */
160 __asm__ __volatile__("stc sr, %0\n\t"
161 "and %1, %0\n\t"
162 "ldc %0, sr"
163 : "=&r" (__dummy)
164 : "r" (~SR_FD));
165}
166
167/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
168#define FPSCR_INIT 0x00080000
169
170#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
171#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
172
173/*
174 * Return saved PC of a blocked thread.
175 */
176#define thread_saved_pc(tsk) (tsk->thread.pc)
177
178void show_trace(struct task_struct *tsk, unsigned long *sp,
179 struct pt_regs *regs);
180
181#ifdef CONFIG_DUMP_CODE
182void show_code(struct pt_regs *regs);
183#else
184static inline void show_code(struct pt_regs *regs)
185{
186}
187#endif
188
189extern unsigned long get_wchan(struct task_struct *p);
190
191#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
192#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
193
194#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
195
196#define PREFETCH_STRIDE L1_CACHE_BYTES
197#define ARCH_HAS_PREFETCH
198#define ARCH_HAS_PREFETCHW
199
200static inline void prefetch(const void *x)
201{
202 __builtin_prefetch(x, 0, 3);
203}
204
205static inline void prefetchw(const void *x)
206{
207 __builtin_prefetch(x, 1, 3);
208}
209#endif
210
211#endif /* __KERNEL__ */
212#endif /* __ASM_SH_PROCESSOR_32_H */