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 16 #include <asm/isadep.h> 17 18 #include <asm/cachectl.h> 19 #include <asm/mipsregs.h> 20 #include <asm/reg.h> 21 #include <asm/system.h> 22 23 /* 24 * Return current * instruction pointer ("program counter"). 25 */ 26 #define current_text_addr() ({ __label__ _l; _l: &&_l;}) 27 28 /* 29 * System setup and hardware flags.. 30 */ 31 extern void (*cpu_wait)(void); 32 33 extern unsigned int vced_count, vcei_count; 34 35 #define NUM_FPU_REGS 32 36 37 typedef __u64 fpureg_t; 38 39 /* 40 * It would be nice to add some more fields for emulator statistics, but there 41 * are a number of fixed offsets in offset.h and elsewhere that would have to 42 * be recalculated by hand. So the additional information will be private to 43 * the FPU emulator for now. See asm-mips/fpu_emulator.h. 44 */ 45 46 struct mips_fpu_struct { 47 fpureg_t fpr[NUM_FPU_REGS]; 48 unsigned int fcr31; 49 }; 50 51 #define NUM_DSP_REGS 6 52 53 typedef __u32 dspreg_t; 54 55 struct mips_dsp_state { 56 dspreg_t dspr[NUM_DSP_REGS]; 57 unsigned int dspcontrol; 58 }; 59 60 typedef struct { 61 unsigned long seg; 62 } mm_segment_t; 63 64 #define ARCH_MIN_TASKALIGN 8 65 66 struct mips_abi; 67 68 /* 69 * If you change thread_struct remember to change the #defines below too! 70 */ 71 struct thread_struct { 72 /* Saved main processor registers. */ 73 unsigned long reg16; 74 unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23; 75 unsigned long reg29, reg30, reg31; 76 77 /* Saved cp0 stuff. */ 78 unsigned long cp0_status; 79 80 /* Saved fpu/fpu emulator stuff. */ 81 struct mips_fpu_struct fpu; 82 #ifdef CONFIG_MIPS_MT_FPAFF 83 /* Emulated instruction count */ 84 unsigned long emulated_fp; 85 /* Saved per-thread scheduler affinity mask */ 86 cpumask_t user_cpus_allowed; 87 #endif /* CONFIG_MIPS_MT_FPAFF */ 88 89 /* Saved state of the DSP ASE, if available. */ 90 struct mips_dsp_state dsp; 91 92 /* Other stuff associated with the thread. */ 93 unsigned long cp0_badvaddr; /* Last user fault */ 94 unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */ 95 unsigned long error_code; 96 unsigned long trap_no; 97 unsigned long irix_trampoline; /* Wheee... */ 98 unsigned long irix_oldctx; 99 struct mips_abi *abi; 100 }; 101 102 struct task_struct; 103 104 /* Free all resources held by a thread. */ 105 #define release_thread(thread) do { } while(0) 106 107 /* Prepare to copy thread state - unlazy all lazy status */ 108 #define prepare_to_copy(tsk) do { } while (0) 109 110 #define cpu_relax() barrier() 111 112 /* 113 * Return_address is a replacement for __builtin_return_address(count) 114 * which on certain architectures cannot reasonably be implemented in GCC 115 * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386). 116 * Note that __builtin_return_address(x>=1) is forbidden because GCC 117 * aborts compilation on some CPUs. It's simply not possible to unwind 118 * some CPU's stackframes. 119 * 120 * __builtin_return_address works only for non-leaf functions. We avoid the 121 * overhead of a function call by forcing the compiler to save the return 122 * address register on the stack. 123 */ 124 #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);}) 125 126 #ifdef CONFIG_CPU_HAS_PREFETCH 127 128 #define ARCH_HAS_PREFETCH 129 130 static inline void prefetch(const void *addr) 131 { 132 __asm__ __volatile__( 133 " .set mips4 \n" 134 " pref %0, (%1) \n" 135 " .set mips0 \n" 136 : 137 : "i" (Pref_Load), "r" (addr)); 138 } 139 140 #endif 141 142 #endif /* _ASM_PROCESSOR_H */ 143