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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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_H
9#define __ASM_SH_PROCESSOR_H
10#ifdef __KERNEL__
11
Chase Ventersf6dc8c52006-07-08 11:10:29 -050012#include <linux/compiler.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <asm/page.h>
14#include <asm/types.h>
15#include <asm/cache.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <asm/ptrace.h>
Paul Mundt315bb962006-09-27 18:22:53 +090017#include <asm/cpu-features.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
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\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 * CPU type and hardware bug flags. Kept separately for each CPU.
32 *
33 * Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry
Paul Mundtde027972006-02-01 03:06:02 -080034 * in arch/sh/mm/Kconfig, as well as an entry in arch/sh/kernel/setup.c
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 * for parsing the subtype in get_cpu_subtype().
36 */
37enum cpu_type {
38 /* SH-2 types */
39 CPU_SH7604,
40
41 /* SH-3 types */
Paul Mundte5723e02006-09-27 17:38:11 +090042 CPU_SH7705, CPU_SH7706, CPU_SH7707,
43 CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
44 CPU_SH7709, CPU_SH7709A, CPU_SH7710,
45 CPU_SH7729, CPU_SH7300,
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47 /* SH-4 types */
48 CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
49 CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
Paul Mundte5723e02006-09-27 17:38:11 +090050 CPU_SH73180, CPU_SH7343, CPU_SH7770, CPU_SH7780, CPU_SH7781,
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52 /* Unknown subtype */
53 CPU_SH_NONE
54};
55
56struct sh_cpuinfo {
Paul Mundt72c35542006-09-27 18:27:43 +090057 unsigned int type;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 unsigned long loops_per_jiffy;
59
Paul Mundt72c35542006-09-27 18:27:43 +090060 struct cache_info icache; /* Primary I-cache */
61 struct cache_info dcache; /* Primary D-cache */
62 struct cache_info scache; /* Secondary cache */
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64 unsigned long flags;
Paul Mundt72c35542006-09-27 18:27:43 +090065} __attribute__ ((aligned(SMP_CACHE_BYTES)));
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
67extern struct sh_cpuinfo boot_cpu_data;
68
69#ifdef CONFIG_SMP
70extern struct sh_cpuinfo cpu_data[];
71#define current_cpu_data cpu_data[smp_processor_id()]
72#else
73#define cpu_data (&boot_cpu_data)
74#define current_cpu_data boot_cpu_data
75#endif
76
77/*
78 * User space process size: 2GB.
79 *
80 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
81 */
82#define TASK_SIZE 0x7c000000UL
83
84/* This decides where the kernel will search for a free chunk of vm
85 * space during mmap's.
86 */
87#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
88
89/*
90 * Bit of SR register
91 *
92 * FD-bit:
93 * When it's set, it means the processor doesn't have right to use FPU,
94 * and it results exception when the floating operation is executed.
95 *
96 * IMASK-bit:
97 * Interrupt level mask
98 */
99#define SR_FD 0x00008000
100#define SR_DSP 0x00001000
101#define SR_IMASK 0x000000f0
102
103/*
104 * FPU structure and data
105 */
106
107struct sh_fpu_hard_struct {
108 unsigned long fp_regs[16];
109 unsigned long xfp_regs[16];
110 unsigned long fpscr;
111 unsigned long fpul;
112
113 long status; /* software status information */
114};
115
116/* Dummy fpu emulator */
117struct sh_fpu_soft_struct {
118 unsigned long fp_regs[16];
119 unsigned long xfp_regs[16];
120 unsigned long fpscr;
121 unsigned long fpul;
122
123 unsigned char lookahead;
124 unsigned long entry_pc;
125};
126
127union sh_fpu_union {
128 struct sh_fpu_hard_struct hard;
129 struct sh_fpu_soft_struct soft;
130};
131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132struct thread_struct {
133 unsigned long sp;
134 unsigned long pc;
135
136 unsigned long trap_no, error_code;
137 unsigned long address;
138 /* Hardware debugging registers may come here */
139 unsigned long ubc_pc;
140
141 /* floating point info */
142 union sh_fpu_union fpu;
143};
144
Paul Mundt2991be72006-09-27 17:07:07 +0900145typedef struct {
146 unsigned long seg;
147} mm_segment_t;
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149/* Count of active tasks with UBC settings */
150extern int ubc_usercnt;
151
152#define INIT_THREAD { \
153 sizeof(init_stack) + (long) &init_stack, /* sp */ \
154 0, /* pc */ \
Paul Mundtde027972006-02-01 03:06:02 -0800155 0, 0, \
156 0, \
157 0, \
158 {{{0,}},} /* fpu state */ \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159}
160
161/*
162 * Do necessary setup to start up a newly executed thread.
163 */
164#define start_thread(regs, new_pc, new_sp) \
165 set_fs(USER_DS); \
Paul Mundtde027972006-02-01 03:06:02 -0800166 regs->pr = 0; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 regs->sr = SR_FD; /* User mode. */ \
168 regs->pc = new_pc; \
169 regs->regs[15] = new_sp
170
171/* Forward declaration, a strange C thing */
172struct task_struct;
173struct mm_struct;
174
175/* Free all resources held by a thread. */
176extern void release_thread(struct task_struct *);
177
178/* Prepare to copy thread state - unlazy all lazy status */
179#define prepare_to_copy(tsk) do { } while (0)
180
181/*
182 * create a kernel thread without removing it from tasklists
183 */
184extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
185
186/* Copy and release all segment info associated with a VM */
187#define copy_segments(p, mm) do { } while(0)
188#define release_segments(mm) do { } while(0)
189
190/*
191 * FPU lazy state save handling.
192 */
193
194static __inline__ void disable_fpu(void)
195{
196 unsigned long __dummy;
197
198 /* Set FD flag in SR */
199 __asm__ __volatile__("stc sr, %0\n\t"
200 "or %1, %0\n\t"
201 "ldc %0, sr"
202 : "=&r" (__dummy)
203 : "r" (SR_FD));
204}
205
206static __inline__ void enable_fpu(void)
207{
208 unsigned long __dummy;
209
210 /* Clear out FD flag in SR */
211 __asm__ __volatile__("stc sr, %0\n\t"
212 "and %1, %0\n\t"
213 "ldc %0, sr"
214 : "=&r" (__dummy)
215 : "r" (~SR_FD));
216}
217
218static __inline__ void release_fpu(struct pt_regs *regs)
219{
220 regs->sr |= SR_FD;
221}
222
223static __inline__ void grab_fpu(struct pt_regs *regs)
224{
225 regs->sr &= ~SR_FD;
226}
227
228#ifdef CONFIG_CPU_SH4
229extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
230#else
231#define save_fpu(tsk) do { } while (0)
232#endif
233
Paul Mundtde027972006-02-01 03:06:02 -0800234#define unlazy_fpu(tsk, regs) do { \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
Paul Mundtde027972006-02-01 03:06:02 -0800236 save_fpu(tsk, regs); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 } \
238} while (0)
239
Paul Mundtde027972006-02-01 03:06:02 -0800240#define clear_fpu(tsk, regs) do { \
241 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
242 clear_tsk_thread_flag(tsk, TIF_USEDFPU); \
243 release_fpu(regs); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 } \
245} while (0)
246
247/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
248#define FPSCR_INIT 0x00080000
249
250#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
251#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
252
253/*
254 * Return saved PC of a blocked thread.
255 */
256#define thread_saved_pc(tsk) (tsk->thread.pc)
257
Paul Mundt6b002232006-10-12 17:07:45 +0900258void show_trace(struct task_struct *tsk, unsigned long *sp,
259 struct pt_regs *regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260extern unsigned long get_wchan(struct task_struct *p);
261
262#define KSTK_EIP(tsk) ((tsk)->thread.pc)
263#define KSTK_ESP(tsk) ((tsk)->thread.sp)
264
265#define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
Chase Ventersf6dc8c52006-07-08 11:10:29 -0500266#define cpu_relax() barrier()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Paul Mundte86d6b62006-09-27 14:20:54 +0900268#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
269 defined(CONFIG_CPU_SH4)
270#define PREFETCH_STRIDE L1_CACHE_BYTES
271#define ARCH_HAS_PREFETCH
272#define ARCH_HAS_PREFETCHW
273static inline void prefetch(void *x)
274{
275 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
276}
277
278#define prefetchw(x) prefetch(x)
279#endif
280
Paul Mundt19f9a342006-09-27 18:33:49 +0900281#ifdef CONFIG_VSYSCALL
282extern int vsyscall_init(void);
283#else
284#define vsyscall_init() do { } while (0)
285#endif
286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287#endif /* __KERNEL__ */
288#endif /* __ASM_SH_PROCESSOR_H */