Linux kernel mirror (for testing)
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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 Waldorf GMBH
7 * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle
8 * Copyright (C) 1996 Paul M. Antoine
9 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
10 */
11#ifndef _ASM_PROCESSOR_H
12#define _ASM_PROCESSOR_H
13
14#include <linux/config.h>
15#include <linux/cpumask.h>
16#include <linux/threads.h>
17
18#include <asm/cachectl.h>
19#include <asm/cpu.h>
20#include <asm/cpu-info.h>
21#include <asm/mipsregs.h>
22#include <asm/prefetch.h>
23#include <asm/system.h>
24
25/*
26 * Return current * instruction pointer ("program counter").
27 */
28#define current_text_addr() ({ __label__ _l; _l: &&_l;})
29
30/*
31 * System setup and hardware flags..
32 */
33extern void (*cpu_wait)(void);
34
35extern unsigned int vced_count, vcei_count;
36
37#ifdef CONFIG_32BIT
38/*
39 * User space process size: 2GB. This is hardcoded into a few places,
40 * so don't change it unless you know what you are doing.
41 */
42#define TASK_SIZE 0x7fff8000UL
43
44/*
45 * This decides where the kernel will search for a free chunk of vm
46 * space during mmap's.
47 */
48#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
49#endif
50
51#ifdef CONFIG_64BIT
52/*
53 * User space process size: 1TB. This is hardcoded into a few places,
54 * so don't change it unless you know what you are doing. TASK_SIZE
55 * is limited to 1TB by the R4000 architecture; R10000 and better can
56 * support 16TB; the architectural reserve for future expansion is
57 * 8192EB ...
58 */
59#define TASK_SIZE32 0x7fff8000UL
60#define TASK_SIZE 0x10000000000UL
61
62/*
63 * This decides where the kernel will search for a free chunk of vm
64 * space during mmap's.
65 */
66#define TASK_UNMAPPED_BASE ((current->thread.mflags & MF_32BIT_ADDR) ? \
67 PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
68#endif
69
70#define NUM_FPU_REGS 32
71
72typedef __u64 fpureg_t;
73
74struct mips_fpu_hard_struct {
75 fpureg_t fpr[NUM_FPU_REGS];
76 unsigned int fcr31;
77};
78
79/*
80 * It would be nice to add some more fields for emulator statistics, but there
81 * are a number of fixed offsets in offset.h and elsewhere that would have to
82 * be recalculated by hand. So the additional information will be private to
83 * the FPU emulator for now. See asm-mips/fpu_emulator.h.
84 */
85
86struct mips_fpu_soft_struct {
87 fpureg_t fpr[NUM_FPU_REGS];
88 unsigned int fcr31;
89};
90
91union mips_fpu_union {
92 struct mips_fpu_hard_struct hard;
93 struct mips_fpu_soft_struct soft;
94};
95
96#define INIT_FPU { \
97 {{0,},} \
98}
99
100#define NUM_DSP_REGS 6
101
102typedef __u32 dspreg_t;
103
104struct mips_dsp_state {
105 dspreg_t dspr[NUM_DSP_REGS];
106 unsigned int dspcontrol;
107};
108
109#define INIT_DSP {{0,},}
110
111#define INIT_CPUMASK { \
112 {0,} \
113}
114
115typedef struct {
116 unsigned long seg;
117} mm_segment_t;
118
119#define ARCH_MIN_TASKALIGN 8
120
121struct mips_abi;
122
123/*
124 * If you change thread_struct remember to change the #defines below too!
125 */
126struct thread_struct {
127 /* Saved main processor registers. */
128 unsigned long reg16;
129 unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
130 unsigned long reg29, reg30, reg31;
131
132 /* Saved cp0 stuff. */
133 unsigned long cp0_status;
134
135 /* Saved fpu/fpu emulator stuff. */
136 union mips_fpu_union fpu;
137#ifdef CONFIG_MIPS_MT_FPAFF
138 /* Emulated instruction count */
139 unsigned long emulated_fp;
140 /* Saved per-thread scheduler affinity mask */
141 cpumask_t user_cpus_allowed;
142#endif /* CONFIG_MIPS_MT_FPAFF */
143
144 /* Saved state of the DSP ASE, if available. */
145 struct mips_dsp_state dsp;
146
147 /* Other stuff associated with the thread. */
148 unsigned long cp0_badvaddr; /* Last user fault */
149 unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */
150 unsigned long error_code;
151 unsigned long trap_no;
152#define MF_FIXADE 1 /* Fix address errors in software */
153#define MF_LOGADE 2 /* Log address errors to syslog */
154#define MF_32BIT_REGS 4 /* also implies 16/32 fprs */
155#define MF_32BIT_ADDR 8 /* 32-bit address space (o32/n32) */
156#define MF_FPUBOUND 0x10 /* thread bound to FPU-full CPU set */
157 unsigned long mflags;
158 unsigned long irix_trampoline; /* Wheee... */
159 unsigned long irix_oldctx;
160 struct mips_abi *abi;
161};
162
163#define MF_ABI_MASK (MF_32BIT_REGS | MF_32BIT_ADDR)
164#define MF_O32 (MF_32BIT_REGS | MF_32BIT_ADDR)
165#define MF_N32 MF_32BIT_ADDR
166#define MF_N64 0
167
168#ifdef CONFIG_MIPS_MT_FPAFF
169#define FPAFF_INIT 0, INIT_CPUMASK,
170#else
171#define FPAFF_INIT
172#endif /* CONFIG_MIPS_MT_FPAFF */
173
174#define INIT_THREAD { \
175 /* \
176 * saved main processor registers \
177 */ \
178 0, 0, 0, 0, 0, 0, 0, 0, \
179 0, 0, 0, \
180 /* \
181 * saved cp0 stuff \
182 */ \
183 0, \
184 /* \
185 * saved fpu/fpu emulator stuff \
186 */ \
187 INIT_FPU, \
188 /* \
189 * fpu affinity state (null if not FPAFF) \
190 */ \
191 FPAFF_INIT \
192 /* \
193 * saved dsp/dsp emulator stuff \
194 */ \
195 INIT_DSP, \
196 /* \
197 * Other stuff associated with the process \
198 */ \
199 0, 0, 0, 0, \
200 /* \
201 * For now the default is to fix address errors \
202 */ \
203 MF_FIXADE, 0, 0 \
204}
205
206struct task_struct;
207
208/* Free all resources held by a thread. */
209#define release_thread(thread) do { } while(0)
210
211/* Prepare to copy thread state - unlazy all lazy status */
212#define prepare_to_copy(tsk) do { } while (0)
213
214extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
215
216extern unsigned long thread_saved_pc(struct task_struct *tsk);
217
218/*
219 * Do necessary setup to start up a newly executed thread.
220 */
221extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
222
223unsigned long get_wchan(struct task_struct *p);
224
225#define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + THREAD_SIZE - 32)
226#define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk) - 1)
227#define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
228#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
229#define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
230
231#define cpu_relax() barrier()
232
233/*
234 * Return_address is a replacement for __builtin_return_address(count)
235 * which on certain architectures cannot reasonably be implemented in GCC
236 * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
237 * Note that __builtin_return_address(x>=1) is forbidden because GCC
238 * aborts compilation on some CPUs. It's simply not possible to unwind
239 * some CPU's stackframes.
240 *
241 * __builtin_return_address works only for non-leaf functions. We avoid the
242 * overhead of a function call by forcing the compiler to save the return
243 * address register on the stack.
244 */
245#define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
246
247#ifdef CONFIG_CPU_HAS_PREFETCH
248
249#define ARCH_HAS_PREFETCH
250
251extern inline void prefetch(const void *addr)
252{
253 __asm__ __volatile__(
254 " .set mips4 \n"
255 " pref %0, (%1) \n"
256 " .set mips0 \n"
257 :
258 : "i" (Pref_Load), "r" (addr));
259}
260
261#endif
262
263#endif /* _ASM_PROCESSOR_H */