Linux kernel mirror (for testing)
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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
45extern int _chrp_type;
46
47#ifdef CONFIG_PPC_PREP
48
49/* what kind of prep workstation we are */
50extern 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
72extern int have_of;
73
74struct task_struct;
75void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
76void release_thread(struct task_struct *);
77
78/* Prepare to copy thread state - unlazy all lazy status */
79extern void prepare_to_copy(struct task_struct *tsk);
80
81/* Create a new kernel thread. */
82extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
83
84/* Lazy FPU handling on uni-processor */
85extern struct task_struct *last_task_used_math;
86extern struct task_struct *last_task_used_altivec;
87extern struct task_struct *last_task_used_vsx;
88extern struct task_struct *last_task_used_spe;
89
90#ifdef CONFIG_PPC32
91
92#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
93#error User TASK_SIZE overlaps with KERNEL_START address
94#endif
95#define TASK_SIZE (CONFIG_TASK_SIZE)
96
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)
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_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
114 TASK_SIZE_USER32 : TASK_SIZE_USER64)
115#define TASK_SIZE TASK_SIZE_OF(current)
116
117/* This decides where the kernel will search for a free chunk of vm
118 * space during mmap's.
119 */
120#define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
121#define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
122
123#define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
124 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
125#endif
126
127#ifdef __KERNEL__
128#ifdef __powerpc64__
129
130#define STACK_TOP_USER64 TASK_SIZE_USER64
131#define STACK_TOP_USER32 TASK_SIZE_USER32
132
133#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
134 STACK_TOP_USER32 : STACK_TOP_USER64)
135
136#define STACK_TOP_MAX STACK_TOP_USER64
137
138#else /* __powerpc64__ */
139
140#define STACK_TOP TASK_SIZE
141#define STACK_TOP_MAX STACK_TOP
142
143#endif /* __powerpc64__ */
144#endif /* __KERNEL__ */
145
146typedef struct {
147 unsigned long seg;
148} mm_segment_t;
149
150#define TS_FPROFFSET 0
151#define TS_VSRLOWOFFSET 1
152#define TS_FPR(i) fpr[i][TS_FPROFFSET]
153
154struct thread_struct {
155 unsigned long ksp; /* Kernel stack pointer */
156 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
157
158#ifdef CONFIG_PPC64
159 unsigned long ksp_vsid;
160#endif
161 struct pt_regs *regs; /* Pointer to saved register state */
162 mm_segment_t fs; /* for get_fs() validation */
163#ifdef CONFIG_PPC32
164 void *pgdir; /* root of page-table tree */
165#endif
166#if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
167 unsigned long dbcr0; /* debug control register values */
168 unsigned long dbcr1;
169#endif
170 /* FP and VSX 0-31 register set */
171 double fpr[32][TS_FPRWIDTH];
172 struct {
173
174 unsigned int pad;
175 unsigned int val; /* Floating point status */
176 } fpscr;
177 int fpexc_mode; /* floating-point exception mode */
178 unsigned int align_ctl; /* alignment handling control */
179#ifdef CONFIG_PPC64
180 unsigned long start_tb; /* Start purr when proc switched in */
181 unsigned long accum_tb; /* Total accumilated purr for process */
182#endif
183 unsigned long dabr; /* Data address breakpoint register */
184#ifdef CONFIG_ALTIVEC
185 /* Complete AltiVec register set */
186 vector128 vr[32] __attribute__((aligned(16)));
187 /* AltiVec status */
188 vector128 vscr __attribute__((aligned(16)));
189 unsigned long vrsave;
190 int used_vr; /* set if process has used altivec */
191#endif /* CONFIG_ALTIVEC */
192#ifdef CONFIG_VSX
193 /* VSR status */
194 int used_vsr; /* set if process has used altivec */
195#endif /* CONFIG_VSX */
196#ifdef CONFIG_SPE
197 unsigned long evr[32]; /* upper 32-bits of SPE regs */
198 u64 acc; /* Accumulator */
199 unsigned long spefscr; /* SPE & eFP status */
200 int used_spe; /* set if process has used spe */
201#endif /* CONFIG_SPE */
202};
203
204#define ARCH_MIN_TASKALIGN 16
205
206#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
207#define INIT_SP_LIMIT \
208 (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
209
210
211#ifdef CONFIG_PPC32
212#define INIT_THREAD { \
213 .ksp = INIT_SP, \
214 .ksp_limit = INIT_SP_LIMIT, \
215 .fs = KERNEL_DS, \
216 .pgdir = swapper_pg_dir, \
217 .fpexc_mode = MSR_FE0 | MSR_FE1, \
218}
219#else
220#define INIT_THREAD { \
221 .ksp = INIT_SP, \
222 .ksp_limit = INIT_SP_LIMIT, \
223 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
224 .fs = KERNEL_DS, \
225 .fpr = {{0}}, \
226 .fpscr = { .val = 0, }, \
227 .fpexc_mode = 0, \
228}
229#endif
230
231/*
232 * Return saved PC of a blocked thread. For now, this is the "user" PC
233 */
234#define thread_saved_pc(tsk) \
235 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
236
237#define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs)
238
239unsigned long get_wchan(struct task_struct *p);
240
241#define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
242#define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
243
244/* Get/set floating-point exception mode */
245#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
246#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
247
248extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
249extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
250
251#define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
252#define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
253
254extern int get_endian(struct task_struct *tsk, unsigned long adr);
255extern int set_endian(struct task_struct *tsk, unsigned int val);
256
257#define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
258#define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
259
260extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
261extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
262
263static inline unsigned int __unpack_fe01(unsigned long msr_bits)
264{
265 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
266}
267
268static inline unsigned long __pack_fe01(unsigned int fpmode)
269{
270 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
271}
272
273#ifdef CONFIG_PPC64
274#define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
275#else
276#define cpu_relax() barrier()
277#endif
278
279/* Check that a certain kernel stack pointer is valid in task_struct p */
280int validate_sp(unsigned long sp, struct task_struct *p,
281 unsigned long nbytes);
282
283/*
284 * Prefetch macros.
285 */
286#define ARCH_HAS_PREFETCH
287#define ARCH_HAS_PREFETCHW
288#define ARCH_HAS_SPINLOCK_PREFETCH
289
290static inline void prefetch(const void *x)
291{
292 if (unlikely(!x))
293 return;
294
295 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
296}
297
298static inline void prefetchw(const void *x)
299{
300 if (unlikely(!x))
301 return;
302
303 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
304}
305
306#define spin_lock_prefetch(x) prefetchw(x)
307
308#ifdef CONFIG_PPC64
309#define HAVE_ARCH_PICK_MMAP_LAYOUT
310#endif
311
312#endif /* __KERNEL__ */
313#endif /* __ASSEMBLY__ */
314#endif /* _ASM_POWERPC_PROCESSOR_H */