Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
[linux-2.6] / include / asm-mips / processor.h
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/cpumask.h>
15 #include <linux/threads.h>
16
17 #include <asm/cachectl.h>
18 #include <asm/cpu.h>
19 #include <asm/cpu-info.h>
20 #include <asm/mipsregs.h>
21 #include <asm/prefetch.h>
22 #include <asm/system.h>
23
24 /*
25  * Return current * instruction pointer ("program counter").
26  */
27 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
28
29 /*
30  * System setup and hardware flags..
31  */
32 extern void (*cpu_wait)(void);
33
34 extern unsigned int vced_count, vcei_count;
35
36 #ifdef CONFIG_32BIT
37 /*
38  * User space process size: 2GB. This is hardcoded into a few places,
39  * so don't change it unless you know what you are doing.
40  */
41 #define TASK_SIZE       0x7fff8000UL
42 #define STACK_TOP       TASK_SIZE
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      ((TASK_SIZE / 3) & ~(PAGE_SIZE))
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 #define STACK_TOP       \
62       (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
63
64 /*
65  * This decides where the kernel will search for a free chunk of vm
66  * space during mmap's.
67  */
68 #define TASK_UNMAPPED_BASE                                              \
69         (test_thread_flag(TIF_32BIT_ADDR) ?                             \
70                 PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
71 #define TASK_SIZE_OF(tsk)                                               \
72         (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
73 #endif
74
75 #ifdef __KERNEL__
76 #define STACK_TOP_MAX   TASK_SIZE
77 #endif
78
79 #define NUM_FPU_REGS    32
80
81 typedef __u64 fpureg_t;
82
83 /*
84  * It would be nice to add some more fields for emulator statistics, but there
85  * are a number of fixed offsets in offset.h and elsewhere that would have to
86  * be recalculated by hand.  So the additional information will be private to
87  * the FPU emulator for now.  See asm-mips/fpu_emulator.h.
88  */
89
90 struct mips_fpu_struct {
91         fpureg_t        fpr[NUM_FPU_REGS];
92         unsigned int    fcr31;
93 };
94
95 #define NUM_DSP_REGS   6
96
97 typedef __u32 dspreg_t;
98
99 struct mips_dsp_state {
100         dspreg_t        dspr[NUM_DSP_REGS];
101         unsigned int    dspcontrol;
102 };
103
104 #define INIT_CPUMASK { \
105         {0,} \
106 }
107
108 typedef struct {
109         unsigned long seg;
110 } mm_segment_t;
111
112 #define ARCH_MIN_TASKALIGN      8
113
114 struct mips_abi;
115
116 /*
117  * If you change thread_struct remember to change the #defines below too!
118  */
119 struct thread_struct {
120         /* Saved main processor registers. */
121         unsigned long reg16;
122         unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
123         unsigned long reg29, reg30, reg31;
124
125         /* Saved cp0 stuff. */
126         unsigned long cp0_status;
127
128         /* Saved fpu/fpu emulator stuff. */
129         struct mips_fpu_struct fpu;
130 #ifdef CONFIG_MIPS_MT_FPAFF
131         /* Emulated instruction count */
132         unsigned long emulated_fp;
133         /* Saved per-thread scheduler affinity mask */
134         cpumask_t user_cpus_allowed;
135 #endif /* CONFIG_MIPS_MT_FPAFF */
136
137         /* Saved state of the DSP ASE, if available. */
138         struct mips_dsp_state dsp;
139
140         /* Other stuff associated with the thread. */
141         unsigned long cp0_badvaddr;     /* Last user fault */
142         unsigned long cp0_baduaddr;     /* Last kernel fault accessing USEG */
143         unsigned long error_code;
144         unsigned long trap_no;
145         unsigned long irix_trampoline;  /* Wheee... */
146         unsigned long irix_oldctx;
147         struct mips_abi *abi;
148 };
149
150 #ifdef CONFIG_MIPS_MT_FPAFF
151 #define FPAFF_INIT                                              \
152         .emulated_fp                    = 0,                    \
153         .user_cpus_allowed              = INIT_CPUMASK,
154 #else
155 #define FPAFF_INIT
156 #endif /* CONFIG_MIPS_MT_FPAFF */
157
158 #define INIT_THREAD  {                                          \
159         /*                                                      \
160          * Saved main processor registers                       \
161          */                                                     \
162         .reg16                  = 0,                            \
163         .reg17                  = 0,                            \
164         .reg18                  = 0,                            \
165         .reg19                  = 0,                            \
166         .reg20                  = 0,                            \
167         .reg21                  = 0,                            \
168         .reg22                  = 0,                            \
169         .reg23                  = 0,                            \
170         .reg29                  = 0,                            \
171         .reg30                  = 0,                            \
172         .reg31                  = 0,                            \
173         /*                                                      \
174          * Saved cp0 stuff                                      \
175          */                                                     \
176         .cp0_status             = 0,                            \
177         /*                                                      \
178          * Saved FPU/FPU emulator stuff                         \
179          */                                                     \
180         .fpu                    = {                             \
181                 .fpr            = {0,},                         \
182                 .fcr31          = 0,                            \
183         },                                                      \
184         /*                                                      \
185          * FPU affinity state (null if not FPAFF)               \
186          */                                                     \
187         FPAFF_INIT                                              \
188         /*                                                      \
189          * Saved DSP stuff                                      \
190          */                                                     \
191         .dsp                    = {                             \
192                 .dspr           = {0, },                        \
193                 .dspcontrol     = 0,                            \
194         },                                                      \
195         /*                                                      \
196          * Other stuff associated with the process              \
197          */                                                     \
198         .cp0_badvaddr           = 0,                            \
199         .cp0_baduaddr           = 0,                            \
200         .error_code             = 0,                            \
201         .trap_no                = 0,                            \
202         .irix_trampoline        = 0,                            \
203         .irix_oldctx            = 0,                            \
204 }
205
206 struct 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
214 extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
215
216 extern unsigned long thread_saved_pc(struct task_struct *tsk);
217
218 /*
219  * Do necessary setup to start up a newly executed thread.
220  */
221 extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
222
223 unsigned 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
251 static 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 */