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#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
36#if defined(__KERNEL__) && defined(CONFIG_PPC32)
37
38extern int _chrp_type;
39
40#ifdef CONFIG_PPC_PREP
41
42/* what kind of prep workstation we are */
43extern int _prep_type;
44
45/*
46 * This is used to identify the board type from a given PReP board
47 * vendor. Board revision is also made available. This will be moved
48 * elsewhere soon
49 */
50extern unsigned char ucBoardRev;
51extern unsigned char ucBoardRevMaj, ucBoardRevMin;
52
53#endif /* CONFIG_PPC_PREP */
54
55#ifndef CONFIG_PPC_MULTIPLATFORM
56#define _machine 0
57#endif /* CONFIG_PPC_MULTIPLATFORM */
58
59#endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
60
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
77extern int have_of;
78
79struct task_struct;
80void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
81void release_thread(struct task_struct *);
82
83/* Prepare to copy thread state - unlazy all lazy status */
84extern void prepare_to_copy(struct task_struct *tsk);
85
86/* Create a new kernel thread. */
87extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
88
89/* Lazy FPU handling on uni-processor */
90extern struct task_struct *last_task_used_math;
91extern struct task_struct *last_task_used_altivec;
92extern struct task_struct *last_task_used_spe;
93
94#ifdef CONFIG_PPC32
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 (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
125
126typedef struct {
127 unsigned long seg;
128} mm_segment_t;
129
130struct thread_struct {
131 unsigned long ksp; /* Kernel stack pointer */
132#ifdef CONFIG_PPC64
133 unsigned long ksp_vsid;
134#endif
135 struct pt_regs *regs; /* Pointer to saved register state */
136 mm_segment_t fs; /* for get_fs() validation */
137#ifdef CONFIG_PPC32
138 void *pgdir; /* root of page-table tree */
139 signed long last_syscall;
140#endif
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 */
146 struct { /* fpr ... fpscr must be contiguous */
147
148 unsigned int pad;
149 unsigned int val; /* Floating point status */
150 } fpscr;
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 */
155#endif
156 unsigned long vdso_base; /* base of the vDSO library */
157 unsigned long dabr; /* Data address breakpoint register */
158#ifdef CONFIG_ALTIVEC
159 /* Complete AltiVec register set */
160 vector128 vr[32] __attribute((aligned(16)));
161 /* AltiVec status */
162 vector128 vscr __attribute((aligned(16)));
163 unsigned long vrsave;
164 int used_vr; /* set if process has used altivec */
165#endif /* CONFIG_ALTIVEC */
166#ifdef CONFIG_SPE
167 unsigned long evr[32]; /* upper 32-bits of SPE regs */
168 u64 acc; /* Accumulator */
169 unsigned long spefscr; /* SPE & eFP status */
170 int used_spe; /* set if process has used spe */
171#endif /* CONFIG_SPE */
172};
173
174#define ARCH_MIN_TASKALIGN 16
175
176#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
177
178
179#ifdef CONFIG_PPC32
180#define INIT_THREAD { \
181 .ksp = INIT_SP, \
182 .fs = KERNEL_DS, \
183 .pgdir = swapper_pg_dir, \
184 .fpexc_mode = MSR_FE0 | MSR_FE1, \
185}
186#else
187#define INIT_THREAD { \
188 .ksp = INIT_SP, \
189 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
190 .fs = KERNEL_DS, \
191 .fpr = {0}, \
192 .fpscr = { .val = 0, }, \
193 .fpexc_mode = MSR_FE0|MSR_FE1, \
194}
195#endif
196
197/*
198 * Return saved PC of a blocked thread. For now, this is the "user" PC
199 */
200#define thread_saved_pc(tsk) \
201 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
202
203unsigned long get_wchan(struct task_struct *p);
204
205#define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
206#define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
207
208/* Get/set floating-point exception mode */
209#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
210#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
211
212extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
213extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
214
215static inline unsigned int __unpack_fe01(unsigned long msr_bits)
216{
217 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
218}
219
220static inline unsigned long __pack_fe01(unsigned int fpmode)
221{
222 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
223}
224
225#ifdef CONFIG_PPC64
226#define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
227#else
228#define cpu_relax() barrier()
229#endif
230
231/* Check that a certain kernel stack pointer is valid in task_struct p */
232int validate_sp(unsigned long sp, struct task_struct *p,
233 unsigned long nbytes);
234
235/*
236 * Prefetch macros.
237 */
238#define ARCH_HAS_PREFETCH
239#define ARCH_HAS_PREFETCHW
240#define ARCH_HAS_SPINLOCK_PREFETCH
241
242static inline void prefetch(const void *x)
243{
244 if (unlikely(!x))
245 return;
246
247 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
248}
249
250static inline void prefetchw(const void *x)
251{
252 if (unlikely(!x))
253 return;
254
255 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
256}
257
258#define spin_lock_prefetch(x) prefetchw(x)
259
260#ifdef CONFIG_PPC64
261#define HAVE_ARCH_PICK_MMAP_LAYOUT
262#endif
263
264#endif /* __KERNEL__ */
265#endif /* __ASSEMBLY__ */
266#endif /* _ASM_POWERPC_PROCESSOR_H */