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