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 <asm/page.h>
14#include <asm/types.h>
15#include <asm/cache.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\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
29struct sh_cpuinfo {
30 unsigned int type;
31 unsigned long loops_per_jiffy;
32 unsigned long asid_cache;
33
34 struct cache_info icache; /* Primary I-cache */
35 struct cache_info dcache; /* Primary D-cache */
36 struct cache_info scache; /* Secondary cache */
37
38 unsigned long flags;
39} __attribute__ ((aligned(L1_CACHE_BYTES)));
40
41extern struct sh_cpuinfo cpu_data[];
42#define boot_cpu_data cpu_data[0]
43#define current_cpu_data cpu_data[smp_processor_id()]
44#define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
45
46/*
47 * User space process size: 2GB.
48 *
49 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
50 */
51#define TASK_SIZE 0x7c000000UL
52
53#define STACK_TOP TASK_SIZE
54#define STACK_TOP_MAX STACK_TOP
55
56/* This decides where the kernel will search for a free chunk of vm
57 * space during mmap's.
58 */
59#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
60
61/*
62 * Bit of SR register
63 *
64 * FD-bit:
65 * When it's set, it means the processor doesn't have right to use FPU,
66 * and it results exception when the floating operation is executed.
67 *
68 * IMASK-bit:
69 * Interrupt level mask
70 */
71#define SR_DSP 0x00001000
72#define SR_IMASK 0x000000f0
73
74/*
75 * FPU structure and data
76 */
77
78struct sh_fpu_hard_struct {
79 unsigned long fp_regs[16];
80 unsigned long xfp_regs[16];
81 unsigned long fpscr;
82 unsigned long fpul;
83
84 long status; /* software status information */
85};
86
87/* Dummy fpu emulator */
88struct sh_fpu_soft_struct {
89 unsigned long fp_regs[16];
90 unsigned long xfp_regs[16];
91 unsigned long fpscr;
92 unsigned long fpul;
93
94 unsigned char lookahead;
95 unsigned long entry_pc;
96};
97
98union sh_fpu_union {
99 struct sh_fpu_hard_struct hard;
100 struct sh_fpu_soft_struct soft;
101};
102
103struct thread_struct {
104 /* Saved registers when thread is descheduled */
105 unsigned long sp;
106 unsigned long pc;
107
108 /* Hardware debugging registers */
109 unsigned long ubc_pc;
110
111 /* floating point info */
112 union sh_fpu_union fpu;
113};
114
115typedef struct {
116 unsigned long seg;
117} mm_segment_t;
118
119/* Count of active tasks with UBC settings */
120extern int ubc_usercnt;
121
122#define INIT_THREAD { \
123 .sp = sizeof(init_stack) + (long) &init_stack, \
124}
125
126/*
127 * Do necessary setup to start up a newly executed thread.
128 */
129#define start_thread(regs, new_pc, new_sp) \
130 set_fs(USER_DS); \
131 regs->pr = 0; \
132 regs->sr = SR_FD; /* User mode. */ \
133 regs->pc = new_pc; \
134 regs->regs[15] = new_sp
135
136/* Forward declaration, a strange C thing */
137struct task_struct;
138struct mm_struct;
139
140/* Free all resources held by a thread. */
141extern void release_thread(struct task_struct *);
142
143/* Prepare to copy thread state - unlazy all lazy status */
144#define prepare_to_copy(tsk) do { } while (0)
145
146/*
147 * create a kernel thread without removing it from tasklists
148 */
149extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
150
151/* Copy and release all segment info associated with a VM */
152#define copy_segments(p, mm) do { } while(0)
153#define release_segments(mm) do { } while(0)
154
155/*
156 * FPU lazy state save handling.
157 */
158
159static __inline__ void disable_fpu(void)
160{
161 unsigned long __dummy;
162
163 /* Set FD flag in SR */
164 __asm__ __volatile__("stc sr, %0\n\t"
165 "or %1, %0\n\t"
166 "ldc %0, sr"
167 : "=&r" (__dummy)
168 : "r" (SR_FD));
169}
170
171static __inline__ void enable_fpu(void)
172{
173 unsigned long __dummy;
174
175 /* Clear out FD flag in SR */
176 __asm__ __volatile__("stc sr, %0\n\t"
177 "and %1, %0\n\t"
178 "ldc %0, sr"
179 : "=&r" (__dummy)
180 : "r" (~SR_FD));
181}
182
183/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
184#define FPSCR_INIT 0x00080000
185
186#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
187#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
188
189/*
190 * Return saved PC of a blocked thread.
191 */
192#define thread_saved_pc(tsk) (tsk->thread.pc)
193
194void show_trace(struct task_struct *tsk, unsigned long *sp,
195 struct pt_regs *regs);
196extern unsigned long get_wchan(struct task_struct *p);
197
198#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
199#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
200
201#define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
202#define cpu_relax() barrier()
203
204#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
205 defined(CONFIG_CPU_SH4)
206#define PREFETCH_STRIDE L1_CACHE_BYTES
207#define ARCH_HAS_PREFETCH
208#define ARCH_HAS_PREFETCHW
209static inline void prefetch(void *x)
210{
211 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
212}
213
214#define prefetchw(x) prefetch(x)
215#endif
216
217#endif /* __KERNEL__ */
218#endif /* __ASM_SH_PROCESSOR_32_H */