1 #ifndef _ASM_POWERPC_PROCESSOR_H
2 #define _ASM_POWERPC_PROCESSOR_H
3
4 /*
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.
11 */
12
13 #include <asm/reg.h>
14
15 #ifdef CONFIG_VSX
16 #define TS_FPRWIDTH 2
17 #else
18 #define TS_FPRWIDTH 1
19 #endif
20
21 #ifndef __ASSEMBLY__
22 #include <linux/compiler.h>
23 #include <asm/ptrace.h>
24 #include <asm/types.h>
25
26 /* We do _not_ want to define new machine types at all, those must die
27 * in favor of using the device-tree
28 * -- BenH.
29 */
30
31 /* PREP sub-platform types see residual.h for these */
32 #define _PREP_Motorola 0x01 /* motorola prep */
33 #define _PREP_Firm 0x02 /* firmworks prep */
34 #define _PREP_IBM 0x00 /* ibm prep */
35 #define _PREP_Bull 0x03 /* bull prep */
36
37 /* CHRP sub-platform types. These are arbitrary */
38 #define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */
39 #define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */
40 #define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */
41 #define _CHRP_briq 0x07 /* TotalImpact's briQ */
42
43 #if defined(__KERNEL__) && defined(CONFIG_PPC32)
44
45 extern int _chrp_type;
46
47 #ifdef CONFIG_PPC_PREP
48
49 /* what kind of prep workstation we are */
50 extern int _prep_type;
51
52 #endif /* CONFIG_PPC_PREP */
53
54 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
55
56 /*
57 * Default implementation of macro that returns current
58 * instruction pointer ("program counter").
59 */
60 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
61
62 /* Macros for adjusting thread priority (hardware multi-threading) */
63 #define HMT_very_low() asm volatile("or 31,31,31 # very low priority")
64 #define HMT_low() asm volatile("or 1,1,1 # low priority")
65 #define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority")
66 #define HMT_medium() asm volatile("or 2,2,2 # medium priority")
67 #define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority")
68 #define HMT_high() asm volatile("or 3,3,3 # high priority")
69
70 #ifdef __KERNEL__
71
72 struct task_struct;
73 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
74 void release_thread(struct task_struct *);
75
76 /* Prepare to copy thread state - unlazy all lazy status */
77 extern void prepare_to_copy(struct task_struct *tsk);
78
79 /* Create a new kernel thread. */
80 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
81
82 /* Lazy FPU handling on uni-processor */
83 extern struct task_struct *last_task_used_math;
84 extern struct task_struct *last_task_used_altivec;
85 extern struct task_struct *last_task_used_vsx;
86 extern struct task_struct *last_task_used_spe;
87
88 #ifdef CONFIG_PPC32
89
90 #if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
91 #error User TASK_SIZE overlaps with KERNEL_START address
92 #endif
93 #define TASK_SIZE (CONFIG_TASK_SIZE)
94
95 /* This decides where the kernel will search for a free chunk of vm
96 * space during mmap's.
97 */
98 #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
99 #endif
100
101 #ifdef CONFIG_PPC64
102 /* 64-bit user address space is 44-bits (16TB user VM) */
103 #define TASK_SIZE_USER64 (0x0000100000000000UL)
104
105 /*
106 * 32-bit user address space is 4GB - 1 page
107 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
108 */
109 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
110
111 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
112 TASK_SIZE_USER32 : TASK_SIZE_USER64)
113 #define TASK_SIZE TASK_SIZE_OF(current)
114
115 /* This decides where the kernel will search for a free chunk of vm
116 * space during mmap's.
117 */
118 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
119 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
120
121 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
122 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
123 #endif
124
125 #ifdef __KERNEL__
126 #ifdef __powerpc64__
127
128 #define STACK_TOP_USER64 TASK_SIZE_USER64
129 #define STACK_TOP_USER32 TASK_SIZE_USER32
130
131 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
132 STACK_TOP_USER32 : STACK_TOP_USER64)
133
134 #define STACK_TOP_MAX STACK_TOP_USER64
135
136 #else /* __powerpc64__ */
137
138 #define STACK_TOP TASK_SIZE
139 #define STACK_TOP_MAX STACK_TOP
140
141 #endif /* __powerpc64__ */
142 #endif /* __KERNEL__ */
143
144 typedef struct {
145 unsigned long seg;
146 } mm_segment_t;
147
148 #define TS_FPROFFSET 0
149 #define TS_VSRLOWOFFSET 1
150 #define TS_FPR(i) fpr[i][TS_FPROFFSET]
151
152 struct thread_struct {
153 unsigned long ksp; /* Kernel stack pointer */
154 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
155
156 #ifdef CONFIG_PPC64
157 unsigned long ksp_vsid;
158 #endif
159 struct pt_regs *regs; /* Pointer to saved register state */
160 mm_segment_t fs; /* for get_fs() validation */
161 #ifdef CONFIG_PPC32
162 void *pgdir; /* root of page-table tree */
163 #endif
164 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
165 unsigned long dbcr0; /* debug control register values */
166 unsigned long dbcr1;
167 #endif
168 /* FP and VSX 0-31 register set */
169 double fpr[32][TS_FPRWIDTH];
170 struct {
171
172 unsigned int pad;
173 unsigned int val; /* Floating point status */
174 } fpscr;
175 int fpexc_mode; /* floating-point exception mode */
176 unsigned int align_ctl; /* alignment handling control */
177 #ifdef CONFIG_PPC64
178 unsigned long start_tb; /* Start purr when proc switched in */
179 unsigned long accum_tb; /* Total accumilated purr for process */
180 #endif
181 unsigned long dabr; /* Data address breakpoint register */
182 #ifdef CONFIG_ALTIVEC
183 /* Complete AltiVec register set */
184 vector128 vr[32] __attribute__((aligned(16)));
185 /* AltiVec status */
186 vector128 vscr __attribute__((aligned(16)));
187 unsigned long vrsave;
188 int used_vr; /* set if process has used altivec */
189 #endif /* CONFIG_ALTIVEC */
190 #ifdef CONFIG_VSX
191 /* VSR status */
192 int used_vsr; /* set if process has used altivec */
193 #endif /* CONFIG_VSX */
194 #ifdef CONFIG_SPE
195 unsigned long evr[32]; /* upper 32-bits of SPE regs */
196 u64 acc; /* Accumulator */
197 unsigned long spefscr; /* SPE & eFP status */
198 int used_spe; /* set if process has used spe */
199 #endif /* CONFIG_SPE */
200 };
201
202 #define ARCH_MIN_TASKALIGN 16
203
204 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
205 #define INIT_SP_LIMIT \
206 (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
207
208 #ifdef CONFIG_SPE
209 #define SPEFSCR_INIT .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
210 #else
211 #define SPEFSCR_INIT
212 #endif
213
214 #ifdef CONFIG_PPC32
215 #define INIT_THREAD { \
216 .ksp = INIT_SP, \
217 .ksp_limit = INIT_SP_LIMIT, \
218 .fs = KERNEL_DS, \
219 .pgdir = swapper_pg_dir, \
220 .fpexc_mode = MSR_FE0 | MSR_FE1, \
221 SPEFSCR_INIT \
222 }
223 #else
224 #define INIT_THREAD { \
225 .ksp = INIT_SP, \
226 .ksp_limit = INIT_SP_LIMIT, \
227 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
228 .fs = KERNEL_DS, \
229 .fpr = {{0}}, \
230 .fpscr = { .val = 0, }, \
231 .fpexc_mode = 0, \
232 }
233 #endif
234
235 /*
236 * Return saved PC of a blocked thread. For now, this is the "user" PC
237 */
238 #define thread_saved_pc(tsk) \
239 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
240
241 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs)
242
243 unsigned long get_wchan(struct task_struct *p);
244
245 #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
246 #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
247
248 /* Get/set floating-point exception mode */
249 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
250 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
251
252 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
253 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
254
255 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
256 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
257
258 extern int get_endian(struct task_struct *tsk, unsigned long adr);
259 extern int set_endian(struct task_struct *tsk, unsigned int val);
260
261 #define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
262 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
263
264 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
265 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
266
__unpack_fe01(unsigned long msr_bits)267 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
268 {
269 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
270 }
271
__pack_fe01(unsigned int fpmode)272 static inline unsigned long __pack_fe01(unsigned int fpmode)
273 {
274 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
275 }
276
277 #ifdef CONFIG_PPC64
278 #define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
279 #else
280 #define cpu_relax() barrier()
281 #endif
282
283 /* Check that a certain kernel stack pointer is valid in task_struct p */
284 int validate_sp(unsigned long sp, struct task_struct *p,
285 unsigned long nbytes);
286
287 /*
288 * Prefetch macros.
289 */
290 #define ARCH_HAS_PREFETCH
291 #define ARCH_HAS_PREFETCHW
292 #define ARCH_HAS_SPINLOCK_PREFETCH
293
prefetch(const void * x)294 static inline void prefetch(const void *x)
295 {
296 if (unlikely(!x))
297 return;
298
299 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
300 }
301
prefetchw(const void * x)302 static inline void prefetchw(const void *x)
303 {
304 if (unlikely(!x))
305 return;
306
307 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
308 }
309
310 #define spin_lock_prefetch(x) prefetchw(x)
311
312 #ifdef CONFIG_PPC64
313 #define HAVE_ARCH_PICK_MMAP_LAYOUT
314 #endif
315
316 #endif /* __KERNEL__ */
317 #endif /* __ASSEMBLY__ */
318 #endif /* _ASM_POWERPC_PROCESSOR_H */
319