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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 | /* * 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, 1999, 2001, 2002, 2003 Ralf Baechle * Copyright (C) 1996 Paul M. Antoine * Copyright (C) 1999, 2000 Silicon Graphics, Inc. */ #ifndef _ASM_PROCESSOR_H #define _ASM_PROCESSOR_H #include <linux/cpumask.h> #include <linux/threads.h> #include <asm/cachectl.h> #include <asm/cpu.h> #include <asm/cpu-info.h> #include <asm/mipsregs.h> #include <asm/prefetch.h> #include <asm/system.h> /* * Return current * instruction pointer ("program counter"). */ #define current_text_addr() ({ __label__ _l; _l: &&_l;}) /* * System setup and hardware flags.. */ extern void (*cpu_wait)(void); extern unsigned int vced_count, vcei_count; #ifdef CONFIG_32BIT /* * User space process size: 2GB. This is hardcoded into a few places, * so don't change it unless you know what you are doing. */ #define TASK_SIZE 0x7fff8000UL #define STACK_TOP TASK_SIZE /* * This decides where the kernel will search for a free chunk of vm * space during mmap's. */ #define TASK_UNMAPPED_BASE ((TASK_SIZE / 3) & ~(PAGE_SIZE)) #endif #ifdef CONFIG_64BIT /* * User space process size: 1TB. This is hardcoded into a few places, * so don't change it unless you know what you are doing. TASK_SIZE * is limited to 1TB by the R4000 architecture; R10000 and better can * support 16TB; the architectural reserve for future expansion is * 8192EB ... */ #define TASK_SIZE32 0x7fff8000UL #define TASK_SIZE 0x10000000000UL #define STACK_TOP \ (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE) /* * This decides where the kernel will search for a free chunk of vm * space during mmap's. */ #define TASK_UNMAPPED_BASE \ (test_thread_flag(TIF_32BIT_ADDR) ? \ PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3)) #define TASK_SIZE_OF(tsk) \ (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE) #endif #ifdef __KERNEL__ #define STACK_TOP_MAX TASK_SIZE #endif #define NUM_FPU_REGS 32 typedef __u64 fpureg_t; /* * It would be nice to add some more fields for emulator statistics, but there * are a number of fixed offsets in offset.h and elsewhere that would have to * be recalculated by hand. So the additional information will be private to * the FPU emulator for now. See asm-mips/fpu_emulator.h. */ struct mips_fpu_struct { fpureg_t fpr[NUM_FPU_REGS]; unsigned int fcr31; }; #define NUM_DSP_REGS 6 typedef __u32 dspreg_t; struct mips_dsp_state { dspreg_t dspr[NUM_DSP_REGS]; unsigned int dspcontrol; }; #define INIT_CPUMASK { \ {0,} \ } typedef struct { unsigned long seg; } mm_segment_t; #define ARCH_MIN_TASKALIGN 8 struct mips_abi; /* * 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. */ struct mips_fpu_struct fpu; #ifdef CONFIG_MIPS_MT_FPAFF /* Emulated instruction count */ unsigned long emulated_fp; /* Saved per-thread scheduler affinity mask */ cpumask_t user_cpus_allowed; #endif /* CONFIG_MIPS_MT_FPAFF */ /* Saved state of the DSP ASE, if available. */ struct mips_dsp_state dsp; /* 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 irix_trampoline; /* Wheee... */ unsigned long irix_oldctx; struct mips_abi *abi; }; #ifdef CONFIG_MIPS_MT_FPAFF #define FPAFF_INIT \ .emulated_fp = 0, \ .user_cpus_allowed = INIT_CPUMASK, #else #define FPAFF_INIT #endif /* CONFIG_MIPS_MT_FPAFF */ #define INIT_THREAD { \ /* \ * Saved main processor registers \ */ \ .reg16 = 0, \ .reg17 = 0, \ .reg18 = 0, \ .reg19 = 0, \ .reg20 = 0, \ .reg21 = 0, \ .reg22 = 0, \ .reg23 = 0, \ .reg29 = 0, \ .reg30 = 0, \ .reg31 = 0, \ /* \ * Saved cp0 stuff \ */ \ .cp0_status = 0, \ /* \ * Saved FPU/FPU emulator stuff \ */ \ .fpu = { \ .fpr = {0,}, \ .fcr31 = 0, \ }, \ /* \ * FPU affinity state (null if not FPAFF) \ */ \ FPAFF_INIT \ /* \ * Saved DSP stuff \ */ \ .dsp = { \ .dspr = {0, }, \ .dspcontrol = 0, \ }, \ /* \ * Other stuff associated with the process \ */ \ .cp0_badvaddr = 0, \ .cp0_baduaddr = 0, \ .error_code = 0, \ .trap_no = 0, \ .irix_trampoline = 0, \ .irix_oldctx = 0, \ } struct task_struct; /* Free all resources held by a thread. */ #define release_thread(thread) do { } while(0) /* Prepare to copy thread state - unlazy all lazy status */ #define prepare_to_copy(tsk) do { } while (0) extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); extern unsigned long thread_saved_pc(struct task_struct *tsk); /* * Do necessary setup to start up a newly executed thread. */ extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp); unsigned long get_wchan(struct task_struct *p); #define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + THREAD_SIZE - 32) #define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk) - 1) #define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc) #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29]) #define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status) #define cpu_relax() barrier() /* * 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. * * __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);}) #ifdef CONFIG_CPU_HAS_PREFETCH #define ARCH_HAS_PREFETCH static inline void prefetch(const void *addr) { __asm__ __volatile__( " .set mips4 \n" " pref %0, (%1) \n" " .set mips0 \n" : : "i" (Pref_Load), "r" (addr)); } #endif #endif /* _ASM_PROCESSOR_H */ |