1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
/* $Id: processor.h,v 1.14 1999/01/04 16:09:25 ralf Exp $
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994 Waldorf GMBH
* Copyright (C) 1995, 1996, 1997, 1998 Ralf Baechle
* Modified further for R[236]000 compatibility by Paul M. Antoine
*/
#ifndef __ASM_MIPS_PROCESSOR_H
#define __ASM_MIPS_PROCESSOR_H
#if !defined (_LANGUAGE_ASSEMBLY)
#include <asm/cachectl.h>
#include <asm/mipsregs.h>
#include <asm/reg.h>
#include <asm/system.h>
struct mips_cpuinfo {
unsigned long *pgd_quick;
unsigned long *pte_quick;
unsigned long pgtable_cache_sz;
};
/*
* System setup and hardware flags..
* XXX: Should go into mips_cpuinfo.
*/
extern char wait_available; /* only available on R4[26]00 */
extern char cyclecounter_available; /* only available from R4000 upwards. */
extern char dedicated_iv_available; /* some embedded MIPS like Nevada */
extern char vce_available; /* Supports VCED / VCEI exceptions */
extern struct mips_cpuinfo boot_cpu_data;
extern unsigned int vced_count, vcei_count;
#ifdef __SMP__
extern struct mips_cpuinfo cpu_data[];
#define current_cpu_data cpu_data[smp_processor_id()]
#else
#define cpu_data &boot_cpu_data
#define current_cpu_data boot_cpu_data
#endif
/*
* Bus types (default is ISA, but people can check others with these..)
* MCA_bus hardcoded to 0 for now.
*
* This needs to be extended since MIPS systems are being delivered with
* numerous different types of bus systems.
*/
extern int EISA_bus;
#define MCA_bus 0
#define MCA_bus__is_a_macro /* for versions in ksyms.c */
/*
* MIPS has no problems with write protection
*/
#define wp_works_ok 1
#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
/* Lazy FPU handling on uni-processor */
extern struct task_struct *last_task_used_math;
/*
* User space process size: 2GB. This is hardcoded into a few places,
* so don't change it unless you know what you are doing. TASK_SIZE
* for a 64 bit kernel expandable to 8192EB, of which the current MIPS
* implementations will "only" be able to use 1TB ...
*/
#define TASK_SIZE (0x80000000UL)
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
/*
* Size of io_bitmap in longwords: 32 is ports 0-0x3ff.
*/
#define IO_BITMAP_SIZE 32
#define NUM_FPU_REGS 32
struct mips_fpu_hard_struct {
double fp_regs[NUM_FPU_REGS];
unsigned int control;
};
/*
* FIXME: no fpu emulator yet (but who cares anyway?)
*/
struct mips_fpu_soft_struct {
long dummy;
};
union mips_fpu_union {
struct mips_fpu_hard_struct hard;
struct mips_fpu_soft_struct soft;
};
#define INIT_FPU { \
{{0,},} \
}
typedef struct {
unsigned long seg;
} mm_segment_t;
/*
* If you change thread_struct remember to change the #defines below too!
*/
struct thread_struct {
/* Saved main processor registers. */
unsigned long reg16;
unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
unsigned long reg29, reg30, reg31;
/* Saved cp0 stuff. */
unsigned long cp0_status;
/* Saved fpu/fpu emulator stuff. */
union mips_fpu_union fpu;
/* Other stuff associated with the thread. */
unsigned long cp0_badvaddr; /* Last user fault */
unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */
unsigned long error_code;
unsigned long trap_no;
unsigned long pg_dir; /* used in tlb refill */
#define MF_FIXADE 1 /* Fix address errors in software */
#define MF_LOGADE 2 /* Log address errors to syslog */
unsigned long mflags;
mm_segment_t current_ds;
unsigned long irix_trampoline; /* Wheee... */
unsigned long irix_oldctx;
};
#endif /* !defined (_LANGUAGE_ASSEMBLY) */
#define INIT_MMAP { &init_mm, KSEG0, KSEG1, NULL, PAGE_SHARED, \
VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
#define INIT_TSS { \
/* \
* saved main processor registers \
*/ \
0, 0, 0, 0, 0, 0, 0, 0, \
0, 0, 0, \
/* \
* saved cp0 stuff \
*/ \
0, \
/* \
* saved fpu/fpu emulator stuff \
*/ \
INIT_FPU, \
/* \
* Other stuff associated with the process \
*/ \
0, 0, 0, 0, (unsigned long) swapper_pg_dir, \
/* \
* For now the default is to fix address errors \
*/ \
MF_FIXADE, { 0 }, 0, 0 \
}
#ifdef __KERNEL__
#define KERNEL_STACK_SIZE 8192
#if !defined (_LANGUAGE_ASSEMBLY)
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
/* Copy and release all segment info associated with a VM */
#define copy_segments(nr, p, mm) do { } while(0)
#define release_segments(mm) do { } while(0)
#define forget_segments() do { } while (0)
/*
* Return saved PC of a blocked thread.
*/
extern inline unsigned long thread_saved_pc(struct thread_struct *t)
{
extern void ret_from_sys_call(void);
/* New born processes are a special case */
if (t->reg31 == (unsigned long) ret_from_sys_call)
return t->reg31;
return ((unsigned long*)t->reg29)[17];
}
extern int (*user_mode)(struct pt_regs *);
/*
* Do necessary setup to start up a newly executed thread.
*/
extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
/* Allocation and freeing of basic task resources. */
/*
* NOTE! The task struct and the stack go together
*/
#define alloc_task_struct() \
((struct task_struct *) __get_free_pages(GFP_KERNEL,1))
#define free_task_struct(p) free_pages((unsigned long)(p),1)
#define init_task (init_task_union.task)
#define init_stack (init_task_union.stack)
#endif /* !defined (_LANGUAGE_ASSEMBLY) */
#endif /* __KERNEL__ */
/*
* Return_address is a replacement for __builtin_return_address(count)
* which on certain architectures cannot reasonably be implemented in GCC
* (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
* Note that __builtin_return_address(x>=1) is forbidden because GCC
* aborts compilation on some CPUs. It's simply not possible to unwind
* some CPU's stackframes.
*/
#if (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
/*
* __builtin_return_address works only for non-leaf functions. We avoid the
* overhead of a function call by forcing the compiler to save the return
* address register on the stack.
*/
#define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
#else
/*
* __builtin_return_address is not implemented at all. Calling it
* will return senseless values. Return NULL which at least is an obviously
* senseless value.
*/
#define return_address() NULL
#endif
#endif /* __ASM_MIPS_PROCESSOR_H */
|
