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 */ 264
