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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 | ||
14 | #include <linux/config.h> | |
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 | |
42 | ||
43 | /* | |
44 | * This decides where the kernel will search for a free chunk of vm | |
45 | * space during mmap's. | |
46 | */ | |
47 | #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) | |
48 | #endif | |
49 | ||
875d43e7 | 50 | #ifdef CONFIG_64BIT |
1da177e4 LT |
51 | /* |
52 | * User space process size: 1TB. This is hardcoded into a few places, | |
53 | * so don't change it unless you know what you are doing. TASK_SIZE | |
54 | * is limited to 1TB by the R4000 architecture; R10000 and better can | |
55 | * support 16TB; the architectural reserve for future expansion is | |
56 | * 8192EB ... | |
57 | */ | |
58 | #define TASK_SIZE32 0x7fff8000UL | |
59 | #define TASK_SIZE 0x10000000000UL | |
60 | ||
61 | /* | |
62 | * This decides where the kernel will search for a free chunk of vm | |
63 | * space during mmap's. | |
64 | */ | |
65 | #define TASK_UNMAPPED_BASE ((current->thread.mflags & MF_32BIT_ADDR) ? \ | |
66 | PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3)) | |
67 | #endif | |
68 | ||
69 | #define NUM_FPU_REGS 32 | |
70 | ||
71 | typedef __u64 fpureg_t; | |
72 | ||
73 | struct mips_fpu_hard_struct { | |
74 | fpureg_t fpr[NUM_FPU_REGS]; | |
75 | unsigned int fcr31; | |
76 | }; | |
77 | ||
78 | /* | |
79 | * It would be nice to add some more fields for emulator statistics, but there | |
80 | * are a number of fixed offsets in offset.h and elsewhere that would have to | |
81 | * be recalculated by hand. So the additional information will be private to | |
82 | * the FPU emulator for now. See asm-mips/fpu_emulator.h. | |
83 | */ | |
84 | ||
85 | struct mips_fpu_soft_struct { | |
86 | fpureg_t fpr[NUM_FPU_REGS]; | |
87 | unsigned int fcr31; | |
88 | }; | |
89 | ||
90 | union mips_fpu_union { | |
91 | struct mips_fpu_hard_struct hard; | |
92 | struct mips_fpu_soft_struct soft; | |
93 | }; | |
94 | ||
95 | #define INIT_FPU { \ | |
96 | {{0,},} \ | |
97 | } | |
98 | ||
99 | typedef struct { | |
100 | unsigned long seg; | |
101 | } mm_segment_t; | |
102 | ||
103 | #define ARCH_MIN_TASKALIGN 8 | |
104 | ||
105 | /* | |
106 | * If you change thread_struct remember to change the #defines below too! | |
107 | */ | |
108 | struct thread_struct { | |
109 | /* Saved main processor registers. */ | |
110 | unsigned long reg16; | |
111 | unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23; | |
112 | unsigned long reg29, reg30, reg31; | |
113 | ||
114 | /* Saved cp0 stuff. */ | |
115 | unsigned long cp0_status; | |
116 | ||
117 | /* Saved fpu/fpu emulator stuff. */ | |
118 | union mips_fpu_union fpu; | |
119 | ||
120 | /* Other stuff associated with the thread. */ | |
121 | unsigned long cp0_badvaddr; /* Last user fault */ | |
122 | unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */ | |
123 | unsigned long error_code; | |
124 | unsigned long trap_no; | |
125 | #define MF_FIXADE 1 /* Fix address errors in software */ | |
126 | #define MF_LOGADE 2 /* Log address errors to syslog */ | |
127 | #define MF_32BIT_REGS 4 /* also implies 16/32 fprs */ | |
128 | #define MF_32BIT_ADDR 8 /* 32-bit address space (o32/n32) */ | |
129 | unsigned long mflags; | |
130 | unsigned long irix_trampoline; /* Wheee... */ | |
131 | unsigned long irix_oldctx; | |
132 | }; | |
133 | ||
134 | #define MF_ABI_MASK (MF_32BIT_REGS | MF_32BIT_ADDR) | |
135 | #define MF_O32 (MF_32BIT_REGS | MF_32BIT_ADDR) | |
136 | #define MF_N32 MF_32BIT_ADDR | |
137 | #define MF_N64 0 | |
138 | ||
139 | #define INIT_THREAD { \ | |
140 | /* \ | |
141 | * saved main processor registers \ | |
142 | */ \ | |
143 | 0, 0, 0, 0, 0, 0, 0, 0, \ | |
144 | 0, 0, 0, \ | |
145 | /* \ | |
146 | * saved cp0 stuff \ | |
147 | */ \ | |
148 | 0, \ | |
149 | /* \ | |
150 | * saved fpu/fpu emulator stuff \ | |
151 | */ \ | |
152 | INIT_FPU, \ | |
153 | /* \ | |
154 | * Other stuff associated with the process \ | |
155 | */ \ | |
156 | 0, 0, 0, 0, \ | |
157 | /* \ | |
158 | * For now the default is to fix address errors \ | |
159 | */ \ | |
160 | MF_FIXADE, 0, 0 \ | |
161 | } | |
162 | ||
163 | struct task_struct; | |
164 | ||
165 | /* Free all resources held by a thread. */ | |
166 | #define release_thread(thread) do { } while(0) | |
167 | ||
168 | /* Prepare to copy thread state - unlazy all lazy status */ | |
169 | #define prepare_to_copy(tsk) do { } while (0) | |
170 | ||
171 | extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); | |
172 | ||
173 | extern unsigned long thread_saved_pc(struct task_struct *tsk); | |
174 | ||
175 | /* | |
176 | * Do necessary setup to start up a newly executed thread. | |
177 | */ | |
178 | extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp); | |
179 | ||
180 | unsigned long get_wchan(struct task_struct *p); | |
181 | ||
182 | #define __PT_REG(reg) ((long)&((struct pt_regs *)0)->reg - sizeof(struct pt_regs)) | |
183 | #define __KSTK_TOS(tsk) ((unsigned long)(tsk->thread_info) + THREAD_SIZE - 32) | |
184 | #define KSTK_EIP(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(cp0_epc))) | |
185 | #define KSTK_ESP(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(regs[29]))) | |
186 | #define KSTK_STATUS(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(cp0_status))) | |
187 | ||
188 | #define cpu_relax() barrier() | |
189 | ||
190 | /* | |
191 | * Return_address is a replacement for __builtin_return_address(count) | |
192 | * which on certain architectures cannot reasonably be implemented in GCC | |
193 | * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386). | |
194 | * Note that __builtin_return_address(x>=1) is forbidden because GCC | |
195 | * aborts compilation on some CPUs. It's simply not possible to unwind | |
196 | * some CPU's stackframes. | |
197 | * | |
198 | * __builtin_return_address works only for non-leaf functions. We avoid the | |
199 | * overhead of a function call by forcing the compiler to save the return | |
200 | * address register on the stack. | |
201 | */ | |
202 | #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);}) | |
203 | ||
204 | #ifdef CONFIG_CPU_HAS_PREFETCH | |
205 | ||
206 | #define ARCH_HAS_PREFETCH | |
207 | ||
208 | extern inline void prefetch(const void *addr) | |
209 | { | |
210 | __asm__ __volatile__( | |
211 | " .set mips4 \n" | |
212 | " pref %0, (%1) \n" | |
213 | " .set mips0 \n" | |
214 | : | |
215 | : "i" (Pref_Load), "r" (addr)); | |
216 | } | |
217 | ||
218 | #endif | |
219 | ||
220 | #endif /* _ASM_PROCESSOR_H */ |