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