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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1994 Waldorf GMBH | |
7 | * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle | |
8 | * Copyright (C) 1996 Paul M. Antoine | |
9 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
10 | */ | |
11 | #ifndef _ASM_PROCESSOR_H | |
12 | #define _ASM_PROCESSOR_H | |
13 | ||
41c594ab | 14 | #include <linux/cpumask.h> |
1da177e4 LT |
15 | #include <linux/threads.h> |
16 | ||
17 | #include <asm/cachectl.h> | |
18 | #include <asm/cpu.h> | |
19 | #include <asm/cpu-info.h> | |
20 | #include <asm/mipsregs.h> | |
21 | #include <asm/prefetch.h> | |
22 | #include <asm/system.h> | |
23 | ||
24 | /* | |
25 | * Return current * instruction pointer ("program counter"). | |
26 | */ | |
27 | #define current_text_addr() ({ __label__ _l; _l: &&_l;}) | |
28 | ||
29 | /* | |
30 | * System setup and hardware flags.. | |
31 | */ | |
32 | extern void (*cpu_wait)(void); | |
33 | ||
34 | extern unsigned int vced_count, vcei_count; | |
35 | ||
875d43e7 | 36 | #ifdef CONFIG_32BIT |
1da177e4 LT |
37 | /* |
38 | * User space process size: 2GB. This is hardcoded into a few places, | |
39 | * so don't change it unless you know what you are doing. | |
40 | */ | |
41 | #define TASK_SIZE 0x7fff8000UL | |
922a70d3 | 42 | #define STACK_TOP TASK_SIZE |
1da177e4 LT |
43 | |
44 | /* | |
45 | * This decides where the kernel will search for a free chunk of vm | |
46 | * space during mmap's. | |
47 | */ | |
27ac792c | 48 | #define TASK_UNMAPPED_BASE ((TASK_SIZE / 3) & ~(PAGE_SIZE)) |
1da177e4 LT |
49 | #endif |
50 | ||
875d43e7 | 51 | #ifdef CONFIG_64BIT |
1da177e4 LT |
52 | /* |
53 | * User space process size: 1TB. This is hardcoded into a few places, | |
54 | * so don't change it unless you know what you are doing. TASK_SIZE | |
55 | * is limited to 1TB by the R4000 architecture; R10000 and better can | |
56 | * support 16TB; the architectural reserve for future expansion is | |
57 | * 8192EB ... | |
58 | */ | |
59 | #define TASK_SIZE32 0x7fff8000UL | |
60 | #define TASK_SIZE 0x10000000000UL | |
922a70d3 DH |
61 | #define STACK_TOP \ |
62 | (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE) | |
1da177e4 LT |
63 | |
64 | /* | |
65 | * This decides where the kernel will search for a free chunk of vm | |
66 | * space during mmap's. | |
67 | */ | |
293c5bd1 RB |
68 | #define TASK_UNMAPPED_BASE \ |
69 | (test_thread_flag(TIF_32BIT_ADDR) ? \ | |
70 | PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3)) | |
82455257 DH |
71 | #define TASK_SIZE_OF(tsk) \ |
72 | (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE) | |
1da177e4 LT |
73 | #endif |
74 | ||
922a70d3 DH |
75 | #ifdef __KERNEL__ |
76 | #define STACK_TOP_MAX TASK_SIZE | |
77 | #endif | |
78 | ||
1da177e4 LT |
79 | #define NUM_FPU_REGS 32 |
80 | ||
81 | typedef __u64 fpureg_t; | |
82 | ||
1da177e4 LT |
83 | /* |
84 | * It would be nice to add some more fields for emulator statistics, but there | |
85 | * are a number of fixed offsets in offset.h and elsewhere that would have to | |
86 | * be recalculated by hand. So the additional information will be private to | |
87 | * the FPU emulator for now. See asm-mips/fpu_emulator.h. | |
88 | */ | |
89 | ||
eae89076 | 90 | struct mips_fpu_struct { |
1da177e4 LT |
91 | fpureg_t fpr[NUM_FPU_REGS]; |
92 | unsigned int fcr31; | |
93 | }; | |
94 | ||
e50c0a8f RB |
95 | #define NUM_DSP_REGS 6 |
96 | ||
97 | typedef __u32 dspreg_t; | |
98 | ||
99 | struct mips_dsp_state { | |
100 | dspreg_t dspr[NUM_DSP_REGS]; | |
101 | unsigned int dspcontrol; | |
e50c0a8f RB |
102 | }; |
103 | ||
41c594ab RB |
104 | #define INIT_CPUMASK { \ |
105 | {0,} \ | |
106 | } | |
107 | ||
1da177e4 LT |
108 | typedef struct { |
109 | unsigned long seg; | |
110 | } mm_segment_t; | |
111 | ||
112 | #define ARCH_MIN_TASKALIGN 8 | |
113 | ||
e50c0a8f RB |
114 | struct mips_abi; |
115 | ||
1da177e4 LT |
116 | /* |
117 | * If you change thread_struct remember to change the #defines below too! | |
118 | */ | |
119 | struct thread_struct { | |
120 | /* Saved main processor registers. */ | |
121 | unsigned long reg16; | |
122 | unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23; | |
123 | unsigned long reg29, reg30, reg31; | |
124 | ||
125 | /* Saved cp0 stuff. */ | |
126 | unsigned long cp0_status; | |
127 | ||
128 | /* Saved fpu/fpu emulator stuff. */ | |
eae89076 | 129 | struct mips_fpu_struct fpu; |
f088fc84 RB |
130 | #ifdef CONFIG_MIPS_MT_FPAFF |
131 | /* Emulated instruction count */ | |
132 | unsigned long emulated_fp; | |
133 | /* Saved per-thread scheduler affinity mask */ | |
134 | cpumask_t user_cpus_allowed; | |
135 | #endif /* CONFIG_MIPS_MT_FPAFF */ | |
1da177e4 | 136 | |
e50c0a8f RB |
137 | /* Saved state of the DSP ASE, if available. */ |
138 | struct mips_dsp_state dsp; | |
139 | ||
1da177e4 LT |
140 | /* Other stuff associated with the thread. */ |
141 | unsigned long cp0_badvaddr; /* Last user fault */ | |
142 | unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */ | |
143 | unsigned long error_code; | |
144 | unsigned long trap_no; | |
1da177e4 LT |
145 | unsigned long irix_trampoline; /* Wheee... */ |
146 | unsigned long irix_oldctx; | |
e50c0a8f | 147 | struct mips_abi *abi; |
1da177e4 LT |
148 | }; |
149 | ||
f088fc84 | 150 | #ifdef CONFIG_MIPS_MT_FPAFF |
fee578fa RB |
151 | #define FPAFF_INIT \ |
152 | .emulated_fp = 0, \ | |
153 | .user_cpus_allowed = INIT_CPUMASK, | |
f088fc84 RB |
154 | #else |
155 | #define FPAFF_INIT | |
156 | #endif /* CONFIG_MIPS_MT_FPAFF */ | |
157 | ||
fee578fa RB |
158 | #define INIT_THREAD { \ |
159 | /* \ | |
160 | * Saved main processor registers \ | |
161 | */ \ | |
162 | .reg16 = 0, \ | |
163 | .reg17 = 0, \ | |
164 | .reg18 = 0, \ | |
165 | .reg19 = 0, \ | |
166 | .reg20 = 0, \ | |
167 | .reg21 = 0, \ | |
168 | .reg22 = 0, \ | |
169 | .reg23 = 0, \ | |
170 | .reg29 = 0, \ | |
171 | .reg30 = 0, \ | |
172 | .reg31 = 0, \ | |
173 | /* \ | |
174 | * Saved cp0 stuff \ | |
175 | */ \ | |
176 | .cp0_status = 0, \ | |
177 | /* \ | |
178 | * Saved FPU/FPU emulator stuff \ | |
179 | */ \ | |
180 | .fpu = { \ | |
181 | .fpr = {0,}, \ | |
182 | .fcr31 = 0, \ | |
183 | }, \ | |
184 | /* \ | |
185 | * FPU affinity state (null if not FPAFF) \ | |
186 | */ \ | |
187 | FPAFF_INIT \ | |
188 | /* \ | |
189 | * Saved DSP stuff \ | |
190 | */ \ | |
191 | .dsp = { \ | |
192 | .dspr = {0, }, \ | |
193 | .dspcontrol = 0, \ | |
194 | }, \ | |
195 | /* \ | |
196 | * Other stuff associated with the process \ | |
197 | */ \ | |
198 | .cp0_badvaddr = 0, \ | |
199 | .cp0_baduaddr = 0, \ | |
200 | .error_code = 0, \ | |
201 | .trap_no = 0, \ | |
fee578fa RB |
202 | .irix_trampoline = 0, \ |
203 | .irix_oldctx = 0, \ | |
1da177e4 LT |
204 | } |
205 | ||
206 | struct task_struct; | |
207 | ||
208 | /* Free all resources held by a thread. */ | |
209 | #define release_thread(thread) do { } while(0) | |
210 | ||
211 | /* Prepare to copy thread state - unlazy all lazy status */ | |
212 | #define prepare_to_copy(tsk) do { } while (0) | |
213 | ||
214 | extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); | |
215 | ||
216 | extern unsigned long thread_saved_pc(struct task_struct *tsk); | |
217 | ||
218 | /* | |
219 | * Do necessary setup to start up a newly executed thread. | |
220 | */ | |
221 | extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp); | |
222 | ||
223 | unsigned long get_wchan(struct task_struct *p); | |
224 | ||
75bb07e7 | 225 | #define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + THREAD_SIZE - 32) |
40bc9c67 AV |
226 | #define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk) - 1) |
227 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc) | |
228 | #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29]) | |
229 | #define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status) | |
1da177e4 LT |
230 | |
231 | #define cpu_relax() barrier() | |
232 | ||
233 | /* | |
234 | * Return_address is a replacement for __builtin_return_address(count) | |
235 | * which on certain architectures cannot reasonably be implemented in GCC | |
236 | * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386). | |
237 | * Note that __builtin_return_address(x>=1) is forbidden because GCC | |
238 | * aborts compilation on some CPUs. It's simply not possible to unwind | |
239 | * some CPU's stackframes. | |
240 | * | |
241 | * __builtin_return_address works only for non-leaf functions. We avoid the | |
242 | * overhead of a function call by forcing the compiler to save the return | |
243 | * address register on the stack. | |
244 | */ | |
245 | #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);}) | |
246 | ||
247 | #ifdef CONFIG_CPU_HAS_PREFETCH | |
248 | ||
249 | #define ARCH_HAS_PREFETCH | |
250 | ||
9797cae3 | 251 | static inline void prefetch(const void *addr) |
1da177e4 LT |
252 | { |
253 | __asm__ __volatile__( | |
254 | " .set mips4 \n" | |
255 | " pref %0, (%1) \n" | |
256 | " .set mips0 \n" | |
257 | : | |
258 | : "i" (Pref_Load), "r" (addr)); | |
259 | } | |
260 | ||
261 | #endif | |
262 | ||
263 | #endif /* _ASM_PROCESSOR_H */ |