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