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