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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#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#ifdef CONFIG_PPC64
142 unsigned long ksp_vsid;
143#endif
144 struct pt_regs *regs; /* Pointer to saved register state */
145 mm_segment_t fs; /* for get_fs() validation */
146#ifdef CONFIG_PPC32
147 void *pgdir; /* root of page-table tree */
148#endif
149#if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
150 unsigned long dbcr0; /* debug control register values */
151 unsigned long dbcr1;
152#endif
153 double fpr[32]; /* Complete floating point set */
154 struct { /* fpr ... fpscr must be contiguous */
155
156 unsigned int pad;
157 unsigned int val; /* Floating point status */
158 } fpscr;
159 int fpexc_mode; /* floating-point exception mode */
160 unsigned int align_ctl; /* alignment handling control */
161#ifdef CONFIG_PPC64
162 unsigned long start_tb; /* Start purr when proc switched in */
163 unsigned long accum_tb; /* Total accumilated purr for process */
164#endif
165 unsigned long dabr; /* Data address breakpoint register */
166#ifdef CONFIG_ALTIVEC
167 /* Complete AltiVec register set */
168 vector128 vr[32] __attribute__((aligned(16)));
169 /* AltiVec status */
170 vector128 vscr __attribute__((aligned(16)));
171 unsigned long vrsave;
172 int used_vr; /* set if process has used altivec */
173#endif /* CONFIG_ALTIVEC */
174#ifdef CONFIG_SPE
175 unsigned long evr[32]; /* upper 32-bits of SPE regs */
176 u64 acc; /* Accumulator */
177 unsigned long spefscr; /* SPE & eFP status */
178 int used_spe; /* set if process has used spe */
179#endif /* CONFIG_SPE */
180};
181
182#define ARCH_MIN_TASKALIGN 16
183
184#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
185
186
187#ifdef CONFIG_PPC32
188#define INIT_THREAD { \
189 .ksp = INIT_SP, \
190 .fs = KERNEL_DS, \
191 .pgdir = swapper_pg_dir, \
192 .fpexc_mode = MSR_FE0 | MSR_FE1, \
193}
194#else
195#define INIT_THREAD { \
196 .ksp = INIT_SP, \
197 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
198 .fs = KERNEL_DS, \
199 .fpr = {0}, \
200 .fpscr = { .val = 0, }, \
201 .fpexc_mode = 0, \
202}
203#endif
204
205/*
206 * Return saved PC of a blocked thread. For now, this is the "user" PC
207 */
208#define thread_saved_pc(tsk) \
209 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
210
211unsigned long get_wchan(struct task_struct *p);
212
213#define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
214#define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
215
216/* Get/set floating-point exception mode */
217#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
218#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
219
220extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
221extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
222
223#define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
224#define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
225
226extern int get_endian(struct task_struct *tsk, unsigned long adr);
227extern int set_endian(struct task_struct *tsk, unsigned int val);
228
229#define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
230#define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
231
232extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
233extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
234
235static inline unsigned int __unpack_fe01(unsigned long msr_bits)
236{
237 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
238}
239
240static inline unsigned long __pack_fe01(unsigned int fpmode)
241{
242 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
243}
244
245#ifdef CONFIG_PPC64
246#define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
247#else
248#define cpu_relax() barrier()
249#endif
250
251/* Check that a certain kernel stack pointer is valid in task_struct p */
252int validate_sp(unsigned long sp, struct task_struct *p,
253 unsigned long nbytes);
254
255/*
256 * Prefetch macros.
257 */
258#define ARCH_HAS_PREFETCH
259#define ARCH_HAS_PREFETCHW
260#define ARCH_HAS_SPINLOCK_PREFETCH
261
262static inline void prefetch(const void *x)
263{
264 if (unlikely(!x))
265 return;
266
267 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
268}
269
270static inline void prefetchw(const void *x)
271{
272 if (unlikely(!x))
273 return;
274
275 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
276}
277
278#define spin_lock_prefetch(x) prefetchw(x)
279
280#ifdef CONFIG_PPC64
281#define HAVE_ARCH_PICK_MMAP_LAYOUT
282#endif
283
284#endif /* __KERNEL__ */
285#endif /* __ASSEMBLY__ */
286#endif /* _ASM_POWERPC_PROCESSOR_H */