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9f04b9e3 PM |
1 | #ifndef _ASM_POWERPC_PROCESSOR_H |
2 | #define _ASM_POWERPC_PROCESSOR_H | |
1da177e4 LT |
3 | |
4 | /* | |
9f04b9e3 PM |
5 | * Copyright (C) 2001 PPC 64 Team, IBM Corp |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
1da177e4 | 11 | */ |
1da177e4 | 12 | |
9f04b9e3 | 13 | #include <asm/reg.h> |
1da177e4 | 14 | |
9f04b9e3 PM |
15 | #ifndef __ASSEMBLY__ |
16 | #include <linux/compiler.h> | |
1da177e4 LT |
17 | #include <asm/ptrace.h> |
18 | #include <asm/types.h> | |
1da177e4 | 19 | |
799d6046 PM |
20 | /* We do _not_ want to define new machine types at all, those must die |
21 | * in favor of using the device-tree | |
22 | * -- BenH. | |
1da177e4 | 23 | */ |
1da177e4 | 24 | |
799d6046 | 25 | /* PREP sub-platform types see residual.h for these */ |
1da177e4 LT |
26 | #define _PREP_Motorola 0x01 /* motorola prep */ |
27 | #define _PREP_Firm 0x02 /* firmworks prep */ | |
28 | #define _PREP_IBM 0x00 /* ibm prep */ | |
29 | #define _PREP_Bull 0x03 /* bull prep */ | |
30 | ||
799d6046 | 31 | /* CHRP sub-platform types. These are arbitrary */ |
1da177e4 LT |
32 | #define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */ |
33 | #define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */ | |
34 | #define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */ | |
26c5032e | 35 | #define _CHRP_briq 0x07 /* TotalImpact's briQ */ |
1da177e4 | 36 | |
e8222502 BH |
37 | #if defined(__KERNEL__) && defined(CONFIG_PPC32) |
38 | ||
39 | extern int _chrp_type; | |
799d6046 | 40 | |
0a26b136 | 41 | #ifdef CONFIG_PPC_PREP |
799d6046 | 42 | |
1da177e4 LT |
43 | /* what kind of prep workstation we are */ |
44 | extern int _prep_type; | |
1da177e4 LT |
45 | |
46 | /* | |
47 | * This is used to identify the board type from a given PReP board | |
799d6046 PM |
48 | * vendor. Board revision is also made available. This will be moved |
49 | * elsewhere soon | |
1da177e4 | 50 | */ |
1da177e4 LT |
51 | extern unsigned char ucBoardRev; |
52 | extern unsigned char ucBoardRevMaj, ucBoardRevMin; | |
799d6046 | 53 | |
0a26b136 PM |
54 | #endif /* CONFIG_PPC_PREP */ |
55 | ||
e8222502 BH |
56 | #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */ |
57 | ||
9f04b9e3 PM |
58 | /* |
59 | * Default implementation of macro that returns current | |
60 | * instruction pointer ("program counter"). | |
61 | */ | |
62 | #define current_text_addr() ({ __label__ _l; _l: &&_l;}) | |
63 | ||
64 | /* Macros for adjusting thread priority (hardware multi-threading) */ | |
65 | #define HMT_very_low() asm volatile("or 31,31,31 # very low priority") | |
66 | #define HMT_low() asm volatile("or 1,1,1 # low priority") | |
67 | #define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority") | |
68 | #define HMT_medium() asm volatile("or 2,2,2 # medium priority") | |
69 | #define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority") | |
70 | #define HMT_high() asm volatile("or 3,3,3 # high priority") | |
71 | ||
72 | #ifdef __KERNEL__ | |
73 | ||
74 | extern int have_of; | |
1da177e4 LT |
75 | |
76 | struct task_struct; | |
9f04b9e3 | 77 | void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp); |
1da177e4 LT |
78 | void release_thread(struct task_struct *); |
79 | ||
80 | /* Prepare to copy thread state - unlazy all lazy status */ | |
81 | extern void prepare_to_copy(struct task_struct *tsk); | |
82 | ||
9f04b9e3 | 83 | /* Create a new kernel thread. */ |
1da177e4 LT |
84 | extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
85 | ||
86 | /* Lazy FPU handling on uni-processor */ | |
87 | extern struct task_struct *last_task_used_math; | |
88 | extern struct task_struct *last_task_used_altivec; | |
89 | extern struct task_struct *last_task_used_spe; | |
90 | ||
9f04b9e3 PM |
91 | #ifdef CONFIG_PPC32 |
92 | #define TASK_SIZE (CONFIG_TASK_SIZE) | |
93 | ||
1da177e4 LT |
94 | /* This decides where the kernel will search for a free chunk of vm |
95 | * space during mmap's. | |
96 | */ | |
97 | #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) | |
9f04b9e3 PM |
98 | #endif |
99 | ||
100 | #ifdef CONFIG_PPC64 | |
101 | /* 64-bit user address space is 44-bits (16TB user VM) */ | |
102 | #define TASK_SIZE_USER64 (0x0000100000000000UL) | |
103 | ||
104 | /* | |
105 | * 32-bit user address space is 4GB - 1 page | |
106 | * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT | |
107 | */ | |
108 | #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE)) | |
109 | ||
110 | #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ | |
111 | TASK_SIZE_USER32 : TASK_SIZE_USER64) | |
112 | ||
113 | /* This decides where the kernel will search for a free chunk of vm | |
114 | * space during mmap's. | |
115 | */ | |
116 | #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4)) | |
117 | #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4)) | |
118 | ||
119 | #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \ | |
120 | TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 ) | |
121 | #endif | |
1da177e4 LT |
122 | |
123 | typedef struct { | |
124 | unsigned long seg; | |
125 | } mm_segment_t; | |
126 | ||
127 | struct thread_struct { | |
128 | unsigned long ksp; /* Kernel stack pointer */ | |
9f04b9e3 PM |
129 | #ifdef CONFIG_PPC64 |
130 | unsigned long ksp_vsid; | |
131 | #endif | |
1da177e4 LT |
132 | struct pt_regs *regs; /* Pointer to saved register state */ |
133 | mm_segment_t fs; /* for get_fs() validation */ | |
9f04b9e3 | 134 | #ifdef CONFIG_PPC32 |
1da177e4 | 135 | void *pgdir; /* root of page-table tree */ |
9f04b9e3 | 136 | #endif |
1da177e4 LT |
137 | #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE) |
138 | unsigned long dbcr0; /* debug control register values */ | |
139 | unsigned long dbcr1; | |
140 | #endif | |
141 | double fpr[32]; /* Complete floating point set */ | |
25c8a78b DG |
142 | struct { /* fpr ... fpscr must be contiguous */ |
143 | ||
144 | unsigned int pad; | |
145 | unsigned int val; /* Floating point status */ | |
146 | } fpscr; | |
9f04b9e3 | 147 | int fpexc_mode; /* floating-point exception mode */ |
e9370ae1 | 148 | unsigned int align_ctl; /* alignment handling control */ |
9f04b9e3 PM |
149 | #ifdef CONFIG_PPC64 |
150 | unsigned long start_tb; /* Start purr when proc switched in */ | |
151 | unsigned long accum_tb; /* Total accumilated purr for process */ | |
9f04b9e3 PM |
152 | #endif |
153 | unsigned long dabr; /* Data address breakpoint register */ | |
1da177e4 LT |
154 | #ifdef CONFIG_ALTIVEC |
155 | /* Complete AltiVec register set */ | |
156 | vector128 vr[32] __attribute((aligned(16))); | |
157 | /* AltiVec status */ | |
158 | vector128 vscr __attribute((aligned(16))); | |
159 | unsigned long vrsave; | |
160 | int used_vr; /* set if process has used altivec */ | |
161 | #endif /* CONFIG_ALTIVEC */ | |
162 | #ifdef CONFIG_SPE | |
163 | unsigned long evr[32]; /* upper 32-bits of SPE regs */ | |
164 | u64 acc; /* Accumulator */ | |
165 | unsigned long spefscr; /* SPE & eFP status */ | |
166 | int used_spe; /* set if process has used spe */ | |
167 | #endif /* CONFIG_SPE */ | |
168 | }; | |
169 | ||
170 | #define ARCH_MIN_TASKALIGN 16 | |
171 | ||
172 | #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) | |
173 | ||
9f04b9e3 PM |
174 | |
175 | #ifdef CONFIG_PPC32 | |
1da177e4 LT |
176 | #define INIT_THREAD { \ |
177 | .ksp = INIT_SP, \ | |
178 | .fs = KERNEL_DS, \ | |
179 | .pgdir = swapper_pg_dir, \ | |
180 | .fpexc_mode = MSR_FE0 | MSR_FE1, \ | |
181 | } | |
9f04b9e3 PM |
182 | #else |
183 | #define INIT_THREAD { \ | |
184 | .ksp = INIT_SP, \ | |
185 | .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \ | |
186 | .fs = KERNEL_DS, \ | |
187 | .fpr = {0}, \ | |
25c8a78b | 188 | .fpscr = { .val = 0, }, \ |
ddf5f75a | 189 | .fpexc_mode = 0, \ |
9f04b9e3 PM |
190 | } |
191 | #endif | |
1da177e4 LT |
192 | |
193 | /* | |
194 | * Return saved PC of a blocked thread. For now, this is the "user" PC | |
195 | */ | |
9f04b9e3 PM |
196 | #define thread_saved_pc(tsk) \ |
197 | ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0) | |
1da177e4 LT |
198 | |
199 | unsigned long get_wchan(struct task_struct *p); | |
200 | ||
9f04b9e3 PM |
201 | #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0) |
202 | #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0) | |
1da177e4 LT |
203 | |
204 | /* Get/set floating-point exception mode */ | |
9f04b9e3 PM |
205 | #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr)) |
206 | #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val)) | |
1da177e4 LT |
207 | |
208 | extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr); | |
209 | extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val); | |
210 | ||
fab5db97 PM |
211 | #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr)) |
212 | #define SET_ENDIAN(tsk, val) set_endian((tsk), (val)) | |
213 | ||
214 | extern int get_endian(struct task_struct *tsk, unsigned long adr); | |
215 | extern int set_endian(struct task_struct *tsk, unsigned int val); | |
216 | ||
e9370ae1 PM |
217 | #define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr)) |
218 | #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val)) | |
219 | ||
220 | extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr); | |
221 | extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val); | |
222 | ||
9f04b9e3 | 223 | static inline unsigned int __unpack_fe01(unsigned long msr_bits) |
1da177e4 LT |
224 | { |
225 | return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8); | |
226 | } | |
227 | ||
9f04b9e3 | 228 | static inline unsigned long __pack_fe01(unsigned int fpmode) |
1da177e4 LT |
229 | { |
230 | return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1); | |
231 | } | |
232 | ||
9f04b9e3 PM |
233 | #ifdef CONFIG_PPC64 |
234 | #define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0) | |
235 | #else | |
1da177e4 | 236 | #define cpu_relax() barrier() |
9f04b9e3 | 237 | #endif |
1da177e4 | 238 | |
2f25194d AB |
239 | /* Check that a certain kernel stack pointer is valid in task_struct p */ |
240 | int validate_sp(unsigned long sp, struct task_struct *p, | |
241 | unsigned long nbytes); | |
242 | ||
1da177e4 LT |
243 | /* |
244 | * Prefetch macros. | |
245 | */ | |
246 | #define ARCH_HAS_PREFETCH | |
247 | #define ARCH_HAS_PREFETCHW | |
248 | #define ARCH_HAS_SPINLOCK_PREFETCH | |
249 | ||
9f04b9e3 | 250 | static inline void prefetch(const void *x) |
1da177e4 | 251 | { |
9f04b9e3 PM |
252 | if (unlikely(!x)) |
253 | return; | |
254 | ||
255 | __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x)); | |
1da177e4 LT |
256 | } |
257 | ||
9f04b9e3 | 258 | static inline void prefetchw(const void *x) |
1da177e4 | 259 | { |
9f04b9e3 PM |
260 | if (unlikely(!x)) |
261 | return; | |
262 | ||
263 | __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x)); | |
1da177e4 LT |
264 | } |
265 | ||
266 | #define spin_lock_prefetch(x) prefetchw(x) | |
267 | ||
9f04b9e3 PM |
268 | #ifdef CONFIG_PPC64 |
269 | #define HAVE_ARCH_PICK_MMAP_LAYOUT | |
270 | #endif | |
1da177e4 | 271 | |
1da177e4 | 272 | #endif /* __KERNEL__ */ |
9f04b9e3 PM |
273 | #endif /* __ASSEMBLY__ */ |
274 | #endif /* _ASM_POWERPC_PROCESSOR_H */ |