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