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\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
29struct sh_cpuinfo {
30 unsigned int type;
31 int cut_major, cut_minor;
32 unsigned long loops_per_jiffy;
33 unsigned long asid_cache;
34
35 struct cache_info icache; /* Primary I-cache */
36 struct cache_info dcache; /* Primary D-cache */
37 struct cache_info scache; /* Secondary cache */
38
39 unsigned long flags;
40} __attribute__ ((aligned(L1_CACHE_BYTES)));
41
42extern struct sh_cpuinfo cpu_data[];
43#define boot_cpu_data cpu_data[0]
44#define current_cpu_data cpu_data[smp_processor_id()]
45#define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
46
47/*
48 * User space process size: 2GB.
49 *
50 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
51 */
52#define TASK_SIZE 0x7c000000UL
53
54#define STACK_TOP TASK_SIZE
55#define STACK_TOP_MAX STACK_TOP
56
57/* This decides where the kernel will search for a free chunk of vm
58 * space during mmap's.
59 */
60#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
61
62/*
63 * Bit of SR register
64 *
65 * FD-bit:
66 * When it's set, it means the processor doesn't have right to use FPU,
67 * and it results exception when the floating operation is executed.
68 *
69 * IMASK-bit:
70 * Interrupt level mask
71 */
72#define SR_DSP 0x00001000
73#define SR_IMASK 0x000000f0
74#define SR_FD 0x00008000
75
76/*
77 * FPU structure and data
78 */
79
80struct sh_fpu_hard_struct {
81 unsigned long fp_regs[16];
82 unsigned long xfp_regs[16];
83 unsigned long fpscr;
84 unsigned long fpul;
85
86 long status; /* software status information */
87};
88
89/* Dummy fpu emulator */
90struct sh_fpu_soft_struct {
91 unsigned long fp_regs[16];
92 unsigned long xfp_regs[16];
93 unsigned long fpscr;
94 unsigned long fpul;
95
96 unsigned char lookahead;
97 unsigned long entry_pc;
98};
99
100union sh_fpu_union {
101 struct sh_fpu_hard_struct hard;
102 struct sh_fpu_soft_struct soft;
103};
104
105struct thread_struct {
106 /* Saved registers when thread is descheduled */
107 unsigned long sp;
108 unsigned long pc;
109
110 /* Hardware debugging registers */
111 unsigned long ubc_pc;
112
113 /* floating point info */
114 union sh_fpu_union fpu;
115};
116
117/* Count of active tasks with UBC settings */
118extern int ubc_usercnt;
119
120#define INIT_THREAD { \
121 .sp = sizeof(init_stack) + (long) &init_stack, \
122}
123
124/*
125 * Do necessary setup to start up a newly executed thread.
126 */
127#define start_thread(regs, new_pc, new_sp) \
128 set_fs(USER_DS); \
129 regs->pr = 0; \
130 regs->sr = SR_FD; /* User mode. */ \
131 regs->pc = new_pc; \
132 regs->regs[15] = new_sp
133
134/* Forward declaration, a strange C thing */
135struct task_struct;
136struct mm_struct;
137
138/* Free all resources held by a thread. */
139extern void release_thread(struct task_struct *);
140
141/* Prepare to copy thread state - unlazy all lazy status */
142#define prepare_to_copy(tsk) do { } while (0)
143
144/*
145 * create a kernel thread without removing it from tasklists
146 */
147extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
148
149/* Copy and release all segment info associated with a VM */
150#define copy_segments(p, mm) do { } while(0)
151#define release_segments(mm) do { } while(0)
152
153/*
154 * FPU lazy state save handling.
155 */
156
157static __inline__ void disable_fpu(void)
158{
159 unsigned long __dummy;
160
161 /* Set FD flag in SR */
162 __asm__ __volatile__("stc sr, %0\n\t"
163 "or %1, %0\n\t"
164 "ldc %0, sr"
165 : "=&r" (__dummy)
166 : "r" (SR_FD));
167}
168
169static __inline__ void enable_fpu(void)
170{
171 unsigned long __dummy;
172
173 /* Clear out FD flag in SR */
174 __asm__ __volatile__("stc sr, %0\n\t"
175 "and %1, %0\n\t"
176 "ldc %0, sr"
177 : "=&r" (__dummy)
178 : "r" (~SR_FD));
179}
180
181/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
182#define FPSCR_INIT 0x00080000
183
184#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
185#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
186
187/*
188 * Return saved PC of a blocked thread.
189 */
190#define thread_saved_pc(tsk) (tsk->thread.pc)
191
192void show_trace(struct task_struct *tsk, unsigned long *sp,
193 struct pt_regs *regs);
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 cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
200#define cpu_relax() barrier()
201
202#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
203 defined(CONFIG_CPU_SH4)
204#define PREFETCH_STRIDE L1_CACHE_BYTES
205#define ARCH_HAS_PREFETCH
206#define ARCH_HAS_PREFETCHW
207static inline void prefetch(void *x)
208{
209 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
210}
211
212#define prefetchw(x) prefetch(x)
213#endif
214
215#endif /* __KERNEL__ */
216#endif /* __ASM_SH_PROCESSOR_32_H */