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1da177e4 LT |
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_H | |
9 | #define __ASM_SH_PROCESSOR_H | |
10 | #ifdef __KERNEL__ | |
11 | ||
12 | #include <asm/page.h> | |
13 | #include <asm/types.h> | |
14 | #include <asm/cache.h> | |
1da177e4 LT |
15 | #include <asm/ptrace.h> |
16 | ||
17 | /* | |
18 | * Default implementation of macro that returns current | |
19 | * instruction pointer ("program counter"). | |
20 | */ | |
21 | #define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n1:":"=z" (pc)); pc; }) | |
22 | ||
23 | /* Core Processor Version Register */ | |
24 | #define CCN_PVR 0xff000030 | |
25 | #define CCN_CVR 0xff000040 | |
26 | #define CCN_PRR 0xff000044 | |
27 | ||
28 | /* | |
29 | * CPU type and hardware bug flags. Kept separately for each CPU. | |
30 | * | |
31 | * Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry | |
de02797a | 32 | * in arch/sh/mm/Kconfig, as well as an entry in arch/sh/kernel/setup.c |
1da177e4 LT |
33 | * for parsing the subtype in get_cpu_subtype(). |
34 | */ | |
35 | enum cpu_type { | |
36 | /* SH-2 types */ | |
37 | CPU_SH7604, | |
38 | ||
39 | /* SH-3 types */ | |
40 | CPU_SH7705, CPU_SH7707, CPU_SH7708, CPU_SH7708S, CPU_SH7708R, | |
41 | CPU_SH7709, CPU_SH7709A, CPU_SH7729, CPU_SH7300, | |
42 | ||
43 | /* SH-4 types */ | |
44 | CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R, | |
45 | CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501, | |
de02797a | 46 | CPU_SH73180, CPU_SH7770, CPU_SH7780, CPU_SH7781, |
1da177e4 LT |
47 | |
48 | /* Unknown subtype */ | |
49 | CPU_SH_NONE | |
50 | }; | |
51 | ||
52 | struct sh_cpuinfo { | |
53 | enum cpu_type type; | |
1da177e4 LT |
54 | unsigned long loops_per_jiffy; |
55 | ||
1da177e4 LT |
56 | struct cache_info icache; |
57 | struct cache_info dcache; | |
58 | ||
59 | unsigned long flags; | |
60 | }; | |
61 | ||
62 | extern struct sh_cpuinfo boot_cpu_data; | |
63 | ||
64 | #ifdef CONFIG_SMP | |
65 | extern struct sh_cpuinfo cpu_data[]; | |
66 | #define current_cpu_data cpu_data[smp_processor_id()] | |
67 | #else | |
68 | #define cpu_data (&boot_cpu_data) | |
69 | #define current_cpu_data boot_cpu_data | |
70 | #endif | |
71 | ||
72 | /* | |
73 | * User space process size: 2GB. | |
74 | * | |
75 | * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff | |
76 | */ | |
77 | #define TASK_SIZE 0x7c000000UL | |
78 | ||
79 | /* This decides where the kernel will search for a free chunk of vm | |
80 | * space during mmap's. | |
81 | */ | |
82 | #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) | |
83 | ||
84 | /* | |
85 | * Bit of SR register | |
86 | * | |
87 | * FD-bit: | |
88 | * When it's set, it means the processor doesn't have right to use FPU, | |
89 | * and it results exception when the floating operation is executed. | |
90 | * | |
91 | * IMASK-bit: | |
92 | * Interrupt level mask | |
93 | */ | |
94 | #define SR_FD 0x00008000 | |
95 | #define SR_DSP 0x00001000 | |
96 | #define SR_IMASK 0x000000f0 | |
97 | ||
98 | /* | |
99 | * FPU structure and data | |
100 | */ | |
101 | ||
102 | struct sh_fpu_hard_struct { | |
103 | unsigned long fp_regs[16]; | |
104 | unsigned long xfp_regs[16]; | |
105 | unsigned long fpscr; | |
106 | unsigned long fpul; | |
107 | ||
108 | long status; /* software status information */ | |
109 | }; | |
110 | ||
111 | /* Dummy fpu emulator */ | |
112 | struct sh_fpu_soft_struct { | |
113 | unsigned long fp_regs[16]; | |
114 | unsigned long xfp_regs[16]; | |
115 | unsigned long fpscr; | |
116 | unsigned long fpul; | |
117 | ||
118 | unsigned char lookahead; | |
119 | unsigned long entry_pc; | |
120 | }; | |
121 | ||
122 | union sh_fpu_union { | |
123 | struct sh_fpu_hard_struct hard; | |
124 | struct sh_fpu_soft_struct soft; | |
125 | }; | |
126 | ||
de02797a | 127 | /* |
1da177e4 LT |
128 | * Processor flags |
129 | */ | |
130 | ||
131 | #define CPU_HAS_FPU 0x0001 /* Hardware FPU support */ | |
132 | #define CPU_HAS_P2_FLUSH_BUG 0x0002 /* Need to flush the cache in P2 area */ | |
133 | #define CPU_HAS_MMU_PAGE_ASSOC 0x0004 /* SH3: TLB way selection bit support */ | |
134 | #define CPU_HAS_DSP 0x0008 /* SH-DSP: DSP support */ | |
135 | #define CPU_HAS_PERF_COUNTER 0x0010 /* Hardware performance counters */ | |
de02797a | 136 | #define CPU_HAS_PTEA 0x0020 /* PTEA register */ |
1da177e4 LT |
137 | |
138 | struct thread_struct { | |
139 | unsigned long sp; | |
140 | unsigned long pc; | |
141 | ||
142 | unsigned long trap_no, error_code; | |
143 | unsigned long address; | |
144 | /* Hardware debugging registers may come here */ | |
145 | unsigned long ubc_pc; | |
146 | ||
147 | /* floating point info */ | |
148 | union sh_fpu_union fpu; | |
149 | }; | |
150 | ||
151 | /* Count of active tasks with UBC settings */ | |
152 | extern int ubc_usercnt; | |
153 | ||
154 | #define INIT_THREAD { \ | |
155 | sizeof(init_stack) + (long) &init_stack, /* sp */ \ | |
156 | 0, /* pc */ \ | |
de02797a PM |
157 | 0, 0, \ |
158 | 0, \ | |
159 | 0, \ | |
160 | {{{0,}},} /* fpu state */ \ | |
1da177e4 LT |
161 | } |
162 | ||
163 | /* | |
164 | * Do necessary setup to start up a newly executed thread. | |
165 | */ | |
166 | #define start_thread(regs, new_pc, new_sp) \ | |
167 | set_fs(USER_DS); \ | |
de02797a | 168 | regs->pr = 0; \ |
1da177e4 LT |
169 | regs->sr = SR_FD; /* User mode. */ \ |
170 | regs->pc = new_pc; \ | |
171 | regs->regs[15] = new_sp | |
172 | ||
173 | /* Forward declaration, a strange C thing */ | |
174 | struct task_struct; | |
175 | struct mm_struct; | |
176 | ||
177 | /* Free all resources held by a thread. */ | |
178 | extern void release_thread(struct task_struct *); | |
179 | ||
180 | /* Prepare to copy thread state - unlazy all lazy status */ | |
181 | #define prepare_to_copy(tsk) do { } while (0) | |
182 | ||
183 | /* | |
184 | * create a kernel thread without removing it from tasklists | |
185 | */ | |
186 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); | |
187 | ||
188 | /* Copy and release all segment info associated with a VM */ | |
189 | #define copy_segments(p, mm) do { } while(0) | |
190 | #define release_segments(mm) do { } while(0) | |
191 | ||
192 | /* | |
193 | * FPU lazy state save handling. | |
194 | */ | |
195 | ||
196 | static __inline__ void disable_fpu(void) | |
197 | { | |
198 | unsigned long __dummy; | |
199 | ||
200 | /* Set FD flag in SR */ | |
201 | __asm__ __volatile__("stc sr, %0\n\t" | |
202 | "or %1, %0\n\t" | |
203 | "ldc %0, sr" | |
204 | : "=&r" (__dummy) | |
205 | : "r" (SR_FD)); | |
206 | } | |
207 | ||
208 | static __inline__ void enable_fpu(void) | |
209 | { | |
210 | unsigned long __dummy; | |
211 | ||
212 | /* Clear out FD flag in SR */ | |
213 | __asm__ __volatile__("stc sr, %0\n\t" | |
214 | "and %1, %0\n\t" | |
215 | "ldc %0, sr" | |
216 | : "=&r" (__dummy) | |
217 | : "r" (~SR_FD)); | |
218 | } | |
219 | ||
220 | static __inline__ void release_fpu(struct pt_regs *regs) | |
221 | { | |
222 | regs->sr |= SR_FD; | |
223 | } | |
224 | ||
225 | static __inline__ void grab_fpu(struct pt_regs *regs) | |
226 | { | |
227 | regs->sr &= ~SR_FD; | |
228 | } | |
229 | ||
230 | #ifdef CONFIG_CPU_SH4 | |
231 | extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs); | |
232 | #else | |
233 | #define save_fpu(tsk) do { } while (0) | |
234 | #endif | |
235 | ||
de02797a | 236 | #define unlazy_fpu(tsk, regs) do { \ |
1da177e4 | 237 | if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \ |
de02797a | 238 | save_fpu(tsk, regs); \ |
1da177e4 LT |
239 | } \ |
240 | } while (0) | |
241 | ||
de02797a PM |
242 | #define clear_fpu(tsk, regs) do { \ |
243 | if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \ | |
244 | clear_tsk_thread_flag(tsk, TIF_USEDFPU); \ | |
245 | release_fpu(regs); \ | |
1da177e4 LT |
246 | } \ |
247 | } while (0) | |
248 | ||
249 | /* Double presision, NANS as NANS, rounding to nearest, no exceptions */ | |
250 | #define FPSCR_INIT 0x00080000 | |
251 | ||
252 | #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */ | |
253 | #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */ | |
254 | ||
255 | /* | |
256 | * Return saved PC of a blocked thread. | |
257 | */ | |
258 | #define thread_saved_pc(tsk) (tsk->thread.pc) | |
259 | ||
260 | extern 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") | |
266 | #define cpu_relax() do { } while (0) | |
267 | ||
268 | #endif /* __KERNEL__ */ | |
269 | #endif /* __ASM_SH_PROCESSOR_H */ |