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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 */
Yoshinori Satob2296322006-11-05 16:18:08 +090039 CPU_SH7604, CPU_SH7619,
40
41 /* SH-2A types */
42 CPU_SH7206,
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44 /* SH-3 types */
Paul Mundte5723e02006-09-27 17:38:11 +090045 CPU_SH7705, CPU_SH7706, CPU_SH7707,
46 CPU_SH7708, CPU_SH7708S, CPU_SH7708R,
47 CPU_SH7709, CPU_SH7709A, CPU_SH7710,
48 CPU_SH7729, CPU_SH7300,
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50 /* SH-4 types */
51 CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R,
52 CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501,
Paul Mundtb552c7e2006-11-20 14:14:29 +090053
54 /* SH-4A types */
Paul Mundt41504c32006-12-11 20:28:03 +090055 CPU_SH7770, CPU_SH7780, CPU_SH7781, CPU_SH7785,
56
57 /* SH4AL-DSP types */
58 CPU_SH73180, CPU_SH7343, CPU_SH7722,
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60 /* Unknown subtype */
61 CPU_SH_NONE
62};
63
64struct sh_cpuinfo {
Paul Mundt72c35542006-09-27 18:27:43 +090065 unsigned int type;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 unsigned long loops_per_jiffy;
Paul Mundtaec5e0e2006-12-25 09:51:47 +090067 unsigned long asid_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Paul Mundt72c35542006-09-27 18:27:43 +090069 struct cache_info icache; /* Primary I-cache */
70 struct cache_info dcache; /* Primary D-cache */
71 struct cache_info scache; /* Secondary cache */
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73 unsigned long flags;
Paul Mundt72c35542006-09-27 18:27:43 +090074} __attribute__ ((aligned(SMP_CACHE_BYTES)));
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76extern struct sh_cpuinfo boot_cpu_data;
77
78#ifdef CONFIG_SMP
79extern struct sh_cpuinfo cpu_data[];
80#define current_cpu_data cpu_data[smp_processor_id()]
81#else
82#define cpu_data (&boot_cpu_data)
83#define current_cpu_data boot_cpu_data
84#endif
85
86/*
87 * User space process size: 2GB.
88 *
89 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
90 */
91#define TASK_SIZE 0x7c000000UL
92
93/* This decides where the kernel will search for a free chunk of vm
94 * space during mmap's.
95 */
96#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
97
98/*
99 * Bit of SR register
100 *
101 * FD-bit:
102 * When it's set, it means the processor doesn't have right to use FPU,
103 * and it results exception when the floating operation is executed.
104 *
105 * IMASK-bit:
106 * Interrupt level mask
107 */
108#define SR_FD 0x00008000
109#define SR_DSP 0x00001000
110#define SR_IMASK 0x000000f0
111
112/*
113 * FPU structure and data
114 */
115
116struct sh_fpu_hard_struct {
117 unsigned long fp_regs[16];
118 unsigned long xfp_regs[16];
119 unsigned long fpscr;
120 unsigned long fpul;
121
122 long status; /* software status information */
123};
124
125/* Dummy fpu emulator */
126struct sh_fpu_soft_struct {
127 unsigned long fp_regs[16];
128 unsigned long xfp_regs[16];
129 unsigned long fpscr;
130 unsigned long fpul;
131
132 unsigned char lookahead;
133 unsigned long entry_pc;
134};
135
136union sh_fpu_union {
137 struct sh_fpu_hard_struct hard;
138 struct sh_fpu_soft_struct soft;
139};
140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141struct thread_struct {
Stuart Menefyb5a1bcb2006-11-21 13:34:04 +0900142 /* Saved registers when thread is descheduled */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 unsigned long sp;
144 unsigned long pc;
145
Stuart Menefyb5a1bcb2006-11-21 13:34:04 +0900146 /* Hardware debugging registers */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 unsigned long ubc_pc;
148
149 /* floating point info */
150 union sh_fpu_union fpu;
151};
152
Paul Mundt2991be72006-09-27 17:07:07 +0900153typedef struct {
154 unsigned long seg;
155} mm_segment_t;
156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157/* Count of active tasks with UBC settings */
158extern int ubc_usercnt;
159
160#define INIT_THREAD { \
Stuart Menefyb5a1bcb2006-11-21 13:34:04 +0900161 .sp = sizeof(init_stack) + (long) &init_stack, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162}
163
164/*
165 * Do necessary setup to start up a newly executed thread.
166 */
167#define start_thread(regs, new_pc, new_sp) \
168 set_fs(USER_DS); \
Paul Mundtde027972006-02-01 03:06:02 -0800169 regs->pr = 0; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 regs->sr = SR_FD; /* User mode. */ \
171 regs->pc = new_pc; \
172 regs->regs[15] = new_sp
173
174/* Forward declaration, a strange C thing */
175struct task_struct;
176struct mm_struct;
177
178/* Free all resources held by a thread. */
179extern void release_thread(struct task_struct *);
180
181/* Prepare to copy thread state - unlazy all lazy status */
182#define prepare_to_copy(tsk) do { } while (0)
183
184/*
185 * create a kernel thread without removing it from tasklists
186 */
187extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
188
189/* Copy and release all segment info associated with a VM */
190#define copy_segments(p, mm) do { } while(0)
191#define release_segments(mm) do { } while(0)
192
193/*
194 * FPU lazy state save handling.
195 */
196
197static __inline__ void disable_fpu(void)
198{
199 unsigned long __dummy;
200
201 /* Set FD flag in SR */
202 __asm__ __volatile__("stc sr, %0\n\t"
203 "or %1, %0\n\t"
204 "ldc %0, sr"
205 : "=&r" (__dummy)
206 : "r" (SR_FD));
207}
208
209static __inline__ void enable_fpu(void)
210{
211 unsigned long __dummy;
212
213 /* Clear out FD flag in SR */
214 __asm__ __volatile__("stc sr, %0\n\t"
215 "and %1, %0\n\t"
216 "ldc %0, sr"
217 : "=&r" (__dummy)
218 : "r" (~SR_FD));
219}
220
221static __inline__ void release_fpu(struct pt_regs *regs)
222{
223 regs->sr |= SR_FD;
224}
225
226static __inline__ void grab_fpu(struct pt_regs *regs)
227{
228 regs->sr &= ~SR_FD;
229}
230
231#ifdef CONFIG_CPU_SH4
232extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
233#else
234#define save_fpu(tsk) do { } while (0)
235#endif
236
Paul Mundtde027972006-02-01 03:06:02 -0800237#define unlazy_fpu(tsk, regs) do { \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
Paul Mundtde027972006-02-01 03:06:02 -0800239 save_fpu(tsk, regs); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 } \
241} while (0)
242
Paul Mundtde027972006-02-01 03:06:02 -0800243#define clear_fpu(tsk, regs) do { \
244 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \
245 clear_tsk_thread_flag(tsk, TIF_USEDFPU); \
246 release_fpu(regs); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 } \
248} while (0)
249
250/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
251#define FPSCR_INIT 0x00080000
252
253#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */
254#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */
255
256/*
257 * Return saved PC of a blocked thread.
258 */
259#define thread_saved_pc(tsk) (tsk->thread.pc)
260
Paul Mundt6b002232006-10-12 17:07:45 +0900261void show_trace(struct task_struct *tsk, unsigned long *sp,
262 struct pt_regs *regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263extern unsigned long get_wchan(struct task_struct *p);
264
Stuart Menefyc9f0b1c2006-11-24 12:53:02 +0900265#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
266#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
268#define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory")
Chase Ventersf6dc8c52006-07-08 11:10:29 -0500269#define cpu_relax() barrier()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
Paul Mundte86d6b62006-09-27 14:20:54 +0900271#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
272 defined(CONFIG_CPU_SH4)
273#define PREFETCH_STRIDE L1_CACHE_BYTES
274#define ARCH_HAS_PREFETCH
275#define ARCH_HAS_PREFETCHW
276static inline void prefetch(void *x)
277{
278 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
279}
280
281#define prefetchw(x) prefetch(x)
282#endif
283
Paul Mundt19f9a342006-09-27 18:33:49 +0900284#ifdef CONFIG_VSYSCALL
285extern int vsyscall_init(void);
286#else
287#define vsyscall_init() do { } while (0)
288#endif
289
Paul Mundt11c19652006-12-25 10:19:56 +0900290/* arch/sh/kernel/setup.c */
291const char *get_cpu_subtype(struct sh_cpuinfo *c);
292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293#endif /* __KERNEL__ */
294#endif /* __ASM_SH_PROCESSOR_H */