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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/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
43 /*
44  * This decides where the kernel will search for a free chunk of vm
45  * space during mmap's.
46  */
47 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 3))
48 #endif
49
50 #ifdef CONFIG_64BIT
51 /*
52  * User space process size: 1TB. This is hardcoded into a few places,
53  * so don't change it unless you know what you are doing.  TASK_SIZE
54  * is limited to 1TB by the R4000 architecture; R10000 and better can
55  * support 16TB; the architectural reserve for future expansion is
56  * 8192EB ...
57  */
58 #define TASK_SIZE32     0x7fff8000UL
59 #define TASK_SIZE       0x10000000000UL
60
61 /*
62  * This decides where the kernel will search for a free chunk of vm
63  * space during mmap's.
64  */
65 #define TASK_UNMAPPED_BASE      ((current->thread.mflags & MF_32BIT_ADDR) ? \
66         PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
67 #endif
68
69 #define NUM_FPU_REGS    32
70
71 typedef __u64 fpureg_t;
72
73 /*
74  * It would be nice to add some more fields for emulator statistics, but there
75  * are a number of fixed offsets in offset.h and elsewhere that would have to
76  * be recalculated by hand.  So the additional information will be private to
77  * the FPU emulator for now.  See asm-mips/fpu_emulator.h.
78  */
79
80 struct mips_fpu_struct {
81         fpureg_t        fpr[NUM_FPU_REGS];
82         unsigned int    fcr31;
83 };
84
85 #define NUM_DSP_REGS   6
86
87 typedef __u32 dspreg_t;
88
89 struct mips_dsp_state {
90         dspreg_t        dspr[NUM_DSP_REGS];
91         unsigned int    dspcontrol;
92 };
93
94 #define INIT_CPUMASK { \
95         {0,} \
96 }
97
98 typedef struct {
99         unsigned long seg;
100 } mm_segment_t;
101
102 #define ARCH_MIN_TASKALIGN      8
103
104 struct mips_abi;
105
106 /*
107  * If you change thread_struct remember to change the #defines below too!
108  */
109 struct thread_struct {
110         /* Saved main processor registers. */
111         unsigned long reg16;
112         unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
113         unsigned long reg29, reg30, reg31;
114
115         /* Saved cp0 stuff. */
116         unsigned long cp0_status;
117
118         /* Saved fpu/fpu emulator stuff. */
119         struct mips_fpu_struct fpu;
120 #ifdef CONFIG_MIPS_MT_FPAFF
121         /* Emulated instruction count */
122         unsigned long emulated_fp;
123         /* Saved per-thread scheduler affinity mask */
124         cpumask_t user_cpus_allowed;
125 #endif /* CONFIG_MIPS_MT_FPAFF */
126
127         /* Saved state of the DSP ASE, if available. */
128         struct mips_dsp_state dsp;
129
130         /* Other stuff associated with the thread. */
131         unsigned long cp0_badvaddr;     /* Last user fault */
132         unsigned long cp0_baduaddr;     /* Last kernel fault accessing USEG */
133         unsigned long error_code;
134         unsigned long trap_no;
135 #define MF_FIXADE       1               /* Fix address errors in software */
136 #define MF_LOGADE       2               /* Log address errors to syslog */
137 #define MF_32BIT_REGS   4               /* also implies 16/32 fprs */
138 #define MF_32BIT_ADDR   8               /* 32-bit address space (o32/n32) */
139 #define MF_FPUBOUND     0x10            /* thread bound to FPU-full CPU set */
140         unsigned long mflags;
141         unsigned long irix_trampoline;  /* Wheee... */
142         unsigned long irix_oldctx;
143         struct mips_abi *abi;
144 };
145
146 #define MF_ABI_MASK     (MF_32BIT_REGS | MF_32BIT_ADDR)
147 #define MF_O32          (MF_32BIT_REGS | MF_32BIT_ADDR)
148 #define MF_N32          MF_32BIT_ADDR
149 #define MF_N64          0
150
151 #ifdef CONFIG_MIPS_MT_FPAFF
152 #define FPAFF_INIT                                              \
153         .emulated_fp                    = 0,                    \
154         .user_cpus_allowed              = INIT_CPUMASK,
155 #else
156 #define FPAFF_INIT
157 #endif /* CONFIG_MIPS_MT_FPAFF */
158
159 #define INIT_THREAD  {                                          \
160         /*                                                      \
161          * Saved main processor registers                       \
162          */                                                     \
163         .reg16                  = 0,                            \
164         .reg17                  = 0,                            \
165         .reg18                  = 0,                            \
166         .reg19                  = 0,                            \
167         .reg20                  = 0,                            \
168         .reg21                  = 0,                            \
169         .reg22                  = 0,                            \
170         .reg23                  = 0,                            \
171         .reg29                  = 0,                            \
172         .reg30                  = 0,                            \
173         .reg31                  = 0,                            \
174         /*                                                      \
175          * Saved cp0 stuff                                      \
176          */                                                     \
177         .cp0_status             = 0,                            \
178         /*                                                      \
179          * Saved FPU/FPU emulator stuff                         \
180          */                                                     \
181         .fpu                    = {                             \
182                 .fpr            = {0,},                         \
183                 .fcr31          = 0,                            \
184         },                                                      \
185         /*                                                      \
186          * FPU affinity state (null if not FPAFF)               \
187          */                                                     \
188         FPAFF_INIT                                              \
189         /*                                                      \
190          * Saved DSP stuff                                      \
191          */                                                     \
192         .dsp                    = {                             \
193                 .dspr           = {0, },                        \
194                 .dspcontrol     = 0,                            \
195         },                                                      \
196         /*                                                      \
197          * Other stuff associated with the process              \
198          */                                                     \
199         .cp0_badvaddr           = 0,                            \
200         .cp0_baduaddr           = 0,                            \
201         .error_code             = 0,                            \
202         .trap_no                = 0,                            \
203         /*                                                      \
204          * For now the default is to fix address errors         \
205          */                                                     \
206         .mflags                 = MF_FIXADE,                    \
207         .irix_trampoline        = 0,                            \
208         .irix_oldctx            = 0,                            \
209 }
210
211 struct task_struct;
212
213 /* Free all resources held by a thread. */
214 #define release_thread(thread) do { } while(0)
215
216 /* Prepare to copy thread state - unlazy all lazy status */
217 #define prepare_to_copy(tsk)    do { } while (0)
218
219 extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
220
221 extern unsigned long thread_saved_pc(struct task_struct *tsk);
222
223 /*
224  * Do necessary setup to start up a newly executed thread.
225  */
226 extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
227
228 unsigned long get_wchan(struct task_struct *p);
229
230 #define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + THREAD_SIZE - 32)
231 #define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk) - 1)
232 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
233 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
234 #define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)
235
236 #define cpu_relax()     barrier()
237
238 /*
239  * Return_address is a replacement for __builtin_return_address(count)
240  * which on certain architectures cannot reasonably be implemented in GCC
241  * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
242  * Note that __builtin_return_address(x>=1) is forbidden because GCC
243  * aborts compilation on some CPUs.  It's simply not possible to unwind
244  * some CPU's stackframes.
245  *
246  * __builtin_return_address works only for non-leaf functions.  We avoid the
247  * overhead of a function call by forcing the compiler to save the return
248  * address register on the stack.
249  */
250 #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
251
252 #ifdef CONFIG_CPU_HAS_PREFETCH
253
254 #define ARCH_HAS_PREFETCH
255
256 static inline void prefetch(const void *addr)
257 {
258         __asm__ __volatile__(
259         "       .set    mips4           \n"
260         "       pref    %0, (%1)        \n"
261         "       .set    mips0           \n"
262         :
263         : "i" (Pref_Load), "r" (addr));
264 }
265
266 #endif
267
268 #endif /* _ASM_PROCESSOR_H */