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1 | #ifndef __ASM_SH64_PROCESSOR_H |
2 | #define __ASM_SH64_PROCESSOR_H | |
3 | ||
4 | /* | |
5 | * This file is subject to the terms and conditions of the GNU General Public | |
6 | * License. See the file "COPYING" in the main directory of this archive | |
7 | * for more details. | |
8 | * | |
9 | * include/asm-sh64/processor.h | |
10 | * | |
11 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
12 | * Copyright (C) 2003 Paul Mundt | |
13 | * Copyright (C) 2004 Richard Curnow | |
14 | * | |
15 | */ | |
16 | ||
17 | #include <asm/page.h> | |
18 | ||
19 | #ifndef __ASSEMBLY__ | |
20 | ||
21 | #include <asm/types.h> | |
22 | #include <asm/cache.h> | |
23 | #include <asm/registers.h> | |
24 | #include <linux/threads.h> | |
25 | ||
26 | /* | |
27 | * Default implementation of macro that returns current | |
28 | * instruction pointer ("program counter"). | |
29 | */ | |
30 | #define current_text_addr() ({ \ | |
31 | void *pc; \ | |
32 | unsigned long long __dummy = 0; \ | |
33 | __asm__("gettr tr0, %1\n\t" \ | |
34 | "pta 4, tr0\n\t" \ | |
35 | "gettr tr0, %0\n\t" \ | |
36 | "ptabs %1, tr0\n\t" \ | |
37 | :"=r" (pc), "=r" (__dummy) \ | |
38 | : "1" (__dummy)); \ | |
39 | pc; }) | |
40 | ||
41 | /* | |
42 | * CPU type and hardware bug flags. Kept separately for each CPU. | |
43 | */ | |
44 | enum cpu_type { | |
45 | CPU_SH5_101, | |
46 | CPU_SH5_103, | |
47 | CPU_SH_NONE | |
48 | }; | |
49 | ||
50 | /* | |
51 | * TLB information structure | |
52 | * | |
53 | * Defined for both I and D tlb, per-processor. | |
54 | */ | |
55 | struct tlb_info { | |
56 | unsigned long long next; | |
57 | unsigned long long first; | |
58 | unsigned long long last; | |
59 | ||
60 | unsigned int entries; | |
61 | unsigned int step; | |
62 | ||
63 | unsigned long flags; | |
64 | }; | |
65 | ||
66 | struct sh_cpuinfo { | |
67 | enum cpu_type type; | |
68 | unsigned long loops_per_jiffy; | |
69 | ||
70 | char hard_math; | |
71 | ||
72 | unsigned long *pgd_quick; | |
73 | unsigned long *pmd_quick; | |
74 | unsigned long *pte_quick; | |
75 | unsigned long pgtable_cache_sz; | |
76 | unsigned int cpu_clock, master_clock, bus_clock, module_clock; | |
77 | ||
78 | /* Cache info */ | |
79 | struct cache_info icache; | |
80 | struct cache_info dcache; | |
81 | ||
82 | /* TLB info */ | |
83 | struct tlb_info itlb; | |
84 | struct tlb_info dtlb; | |
85 | }; | |
86 | ||
87 | extern struct sh_cpuinfo boot_cpu_data; | |
88 | ||
89 | #define cpu_data (&boot_cpu_data) | |
90 | #define current_cpu_data boot_cpu_data | |
91 | ||
92 | #endif | |
93 | ||
94 | /* | |
95 | * User space process size: 2GB - 4k. | |
96 | */ | |
97 | #define TASK_SIZE 0x7ffff000UL | |
98 | ||
99 | /* This decides where the kernel will search for a free chunk of vm | |
100 | * space during mmap's. | |
101 | */ | |
102 | #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) | |
103 | ||
104 | /* | |
105 | * Bit of SR register | |
106 | * | |
107 | * FD-bit: | |
108 | * When it's set, it means the processor doesn't have right to use FPU, | |
109 | * and it results exception when the floating operation is executed. | |
110 | * | |
111 | * IMASK-bit: | |
112 | * Interrupt level mask | |
113 | * | |
114 | * STEP-bit: | |
115 | * Single step bit | |
116 | * | |
117 | */ | |
118 | #define SR_FD 0x00008000 | |
119 | ||
120 | #if defined(CONFIG_SH64_SR_WATCH) | |
121 | #define SR_MMU 0x84000000 | |
122 | #else | |
123 | #define SR_MMU 0x80000000 | |
124 | #endif | |
125 | ||
126 | #define SR_IMASK 0x000000f0 | |
127 | #define SR_SSTEP 0x08000000 | |
128 | ||
129 | #ifndef __ASSEMBLY__ | |
130 | ||
131 | /* | |
132 | * FPU structure and data : require 8-byte alignment as we need to access it | |
133 | with fld.p, fst.p | |
134 | */ | |
135 | ||
136 | struct sh_fpu_hard_struct { | |
137 | unsigned long fp_regs[64]; | |
138 | unsigned int fpscr; | |
139 | /* long status; * software status information */ | |
140 | }; | |
141 | ||
142 | #if 0 | |
143 | /* Dummy fpu emulator */ | |
144 | struct sh_fpu_soft_struct { | |
145 | unsigned long long fp_regs[32]; | |
146 | unsigned int fpscr; | |
147 | unsigned char lookahead; | |
148 | unsigned long entry_pc; | |
149 | }; | |
150 | #endif | |
151 | ||
152 | union sh_fpu_union { | |
153 | struct sh_fpu_hard_struct hard; | |
154 | /* 'hard' itself only produces 32 bit alignment, yet we need | |
155 | to access it using 64 bit load/store as well. */ | |
156 | unsigned long long alignment_dummy; | |
157 | }; | |
158 | ||
159 | struct thread_struct { | |
160 | unsigned long sp; | |
161 | unsigned long pc; | |
162 | /* This stores the address of the pt_regs built during a context | |
163 | switch, or of the register save area built for a kernel mode | |
164 | exception. It is used for backtracing the stack of a sleeping task | |
165 | or one that traps in kernel mode. */ | |
166 | struct pt_regs *kregs; | |
167 | /* This stores the address of the pt_regs constructed on entry from | |
168 | user mode. It is a fixed value over the lifetime of a process, or | |
169 | NULL for a kernel thread. */ | |
170 | struct pt_regs *uregs; | |
171 | ||
172 | unsigned long trap_no, error_code; | |
173 | unsigned long address; | |
174 | /* Hardware debugging registers may come here */ | |
175 | ||
176 | /* floating point info */ | |
177 | union sh_fpu_union fpu; | |
178 | }; | |
179 | ||
180 | #define INIT_MMAP \ | |
181 | { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL } | |
182 | ||
183 | extern struct pt_regs fake_swapper_regs; | |
184 | ||
185 | #define INIT_THREAD { \ | |
186 | .sp = sizeof(init_stack) + \ | |
187 | (long) &init_stack, \ | |
188 | .pc = 0, \ | |
189 | .kregs = &fake_swapper_regs, \ | |
190 | .uregs = NULL, \ | |
191 | .trap_no = 0, \ | |
192 | .error_code = 0, \ | |
193 | .address = 0, \ | |
194 | .fpu = { { { 0, } }, } \ | |
195 | } | |
196 | ||
197 | /* | |
198 | * Do necessary setup to start up a newly executed thread. | |
199 | */ | |
200 | #define SR_USER (SR_MMU | SR_FD) | |
201 | ||
202 | #define start_thread(regs, new_pc, new_sp) \ | |
203 | set_fs(USER_DS); \ | |
204 | regs->sr = SR_USER; /* User mode. */ \ | |
205 | regs->pc = new_pc - 4; /* Compensate syscall exit */ \ | |
206 | regs->pc |= 1; /* Set SHmedia ! */ \ | |
207 | regs->regs[18] = 0; \ | |
208 | regs->regs[15] = new_sp | |
209 | ||
210 | /* Forward declaration, a strange C thing */ | |
211 | struct task_struct; | |
212 | struct mm_struct; | |
213 | ||
214 | /* Free all resources held by a thread. */ | |
215 | extern void release_thread(struct task_struct *); | |
216 | /* | |
217 | * create a kernel thread without removing it from tasklists | |
218 | */ | |
219 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); | |
220 | ||
221 | ||
222 | /* Copy and release all segment info associated with a VM */ | |
223 | #define copy_segments(p, mm) do { } while (0) | |
224 | #define release_segments(mm) do { } while (0) | |
225 | #define forget_segments() do { } while (0) | |
226 | #define prepare_to_copy(tsk) do { } while (0) | |
227 | /* | |
228 | * FPU lazy state save handling. | |
229 | */ | |
230 | ||
231 | extern __inline__ void release_fpu(void) | |
232 | { | |
233 | unsigned long long __dummy; | |
234 | ||
235 | /* Set FD flag in SR */ | |
236 | __asm__ __volatile__("getcon " __SR ", %0\n\t" | |
237 | "or %0, %1, %0\n\t" | |
238 | "putcon %0, " __SR "\n\t" | |
239 | : "=&r" (__dummy) | |
240 | : "r" (SR_FD)); | |
241 | } | |
242 | ||
243 | extern __inline__ void grab_fpu(void) | |
244 | { | |
245 | unsigned long long __dummy; | |
246 | ||
247 | /* Clear out FD flag in SR */ | |
248 | __asm__ __volatile__("getcon " __SR ", %0\n\t" | |
249 | "and %0, %1, %0\n\t" | |
250 | "putcon %0, " __SR "\n\t" | |
251 | : "=&r" (__dummy) | |
252 | : "r" (~SR_FD)); | |
253 | } | |
254 | ||
255 | /* Round to nearest, no exceptions on inexact, overflow, underflow, | |
256 | zero-divide, invalid. Configure option for whether to flush denorms to | |
257 | zero, or except if a denorm is encountered. */ | |
258 | #if defined(CONFIG_SH64_FPU_DENORM_FLUSH) | |
259 | #define FPSCR_INIT 0x00040000 | |
260 | #else | |
261 | #define FPSCR_INIT 0x00000000 | |
262 | #endif | |
263 | ||
264 | /* Save the current FP regs */ | |
265 | void fpsave(struct sh_fpu_hard_struct *fpregs); | |
266 | ||
267 | /* Initialise the FP state of a task */ | |
268 | void fpinit(struct sh_fpu_hard_struct *fpregs); | |
269 | ||
270 | extern struct task_struct *last_task_used_math; | |
271 | ||
272 | /* | |
273 | * Return saved PC of a blocked thread. | |
274 | */ | |
275 | #define thread_saved_pc(tsk) (tsk->thread.pc) | |
276 | ||
277 | extern unsigned long get_wchan(struct task_struct *p); | |
278 | ||
279 | #define KSTK_EIP(tsk) ((tsk)->thread.pc) | |
280 | #define KSTK_ESP(tsk) ((tsk)->thread.sp) | |
281 | ||
282 | #define cpu_relax() do { } while (0) | |
283 | ||
284 | #endif /* __ASSEMBLY__ */ | |
285 | #endif /* __ASM_SH64_PROCESSOR_H */ | |
286 |