1 /* 2 * include/asm-sh/processor.h 3 * 4 * Copyright (C) 1999, 2000 Niibe Yutaka 5 * Copyright (C) 2002, 2003 Paul Mundt 6 */ 7 8 #ifndef __ASM_SH_PROCESSOR_32_H 9 #define __ASM_SH_PROCESSOR_32_H 10 #ifdef __KERNEL__ 11 12 #include <linux/compiler.h> 13 #include <asm/page.h> 14 #include <asm/types.h> 15 #include <asm/cache.h> 16 #include <asm/ptrace.h> 17 18 /* 19 * Default implementation of macro that returns current 20 * instruction pointer ("program counter"). 21 */ 22 #define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n.align 2\n1:":"=z" (pc)); pc; }) 23 24 /* Core Processor Version Register */ 25 #define CCN_PVR 0xff000030 26 #define CCN_CVR 0xff000040 27 #define CCN_PRR 0xff000044 28 29 struct sh_cpuinfo { 30 unsigned int type; 31 int cut_major, cut_minor; 32 unsigned long loops_per_jiffy; 33 unsigned long asid_cache; 34 35 struct cache_info icache; /* Primary I-cache */ 36 struct cache_info dcache; /* Primary D-cache */ 37 struct cache_info scache; /* Secondary cache */ 38 39 unsigned long flags; 40 } __attribute__ ((aligned(L1_CACHE_BYTES))); 41 42 extern struct sh_cpuinfo cpu_data[]; 43 #define boot_cpu_data cpu_data[0] 44 #define current_cpu_data cpu_data[smp_processor_id()] 45 #define raw_current_cpu_data cpu_data[raw_smp_processor_id()] 46 47 /* 48 * User space process size: 2GB. 49 * 50 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff 51 */ 52 #define TASK_SIZE 0x7c000000UL 53 54 #define STACK_TOP TASK_SIZE 55 #define STACK_TOP_MAX STACK_TOP 56 57 /* This decides where the kernel will search for a free chunk of vm 58 * space during mmap's. 59 */ 60 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 61 62 /* 63 * Bit of SR register 64 * 65 * FD-bit: 66 * When it's set, it means the processor doesn't have right to use FPU, 67 * and it results exception when the floating operation is executed. 68 * 69 * IMASK-bit: 70 * Interrupt level mask 71 */ 72 #define SR_DSP 0x00001000 73 #define SR_IMASK 0x000000f0 74 #define SR_FD 0x00008000 75 76 /* 77 * FPU structure and data 78 */ 79 80 struct sh_fpu_hard_struct { 81 unsigned long fp_regs[16]; 82 unsigned long xfp_regs[16]; 83 unsigned long fpscr; 84 unsigned long fpul; 85 86 long status; /* software status information */ 87 }; 88 89 /* Dummy fpu emulator */ 90 struct sh_fpu_soft_struct { 91 unsigned long fp_regs[16]; 92 unsigned long xfp_regs[16]; 93 unsigned long fpscr; 94 unsigned long fpul; 95 96 unsigned char lookahead; 97 unsigned long entry_pc; 98 }; 99 100 union sh_fpu_union { 101 struct sh_fpu_hard_struct hard; 102 struct sh_fpu_soft_struct soft; 103 }; 104 105 struct thread_struct { 106 /* Saved registers when thread is descheduled */ 107 unsigned long sp; 108 unsigned long pc; 109 110 /* Hardware debugging registers */ 111 unsigned long ubc_pc; 112 113 /* floating point info */ 114 union sh_fpu_union fpu; 115 }; 116 117 /* Count of active tasks with UBC settings */ 118 extern int ubc_usercnt; 119 120 #define INIT_THREAD { \ 121 .sp = sizeof(init_stack) + (long) &init_stack, \ 122 } 123 124 /* 125 * Do necessary setup to start up a newly executed thread. 126 */ 127 #define start_thread(regs, new_pc, new_sp) \ 128 set_fs(USER_DS); \ 129 regs->pr = 0; \ 130 regs->sr = SR_FD; /* User mode. */ \ 131 regs->pc = new_pc; \ 132 regs->regs[15] = new_sp 133 134 /* Forward declaration, a strange C thing */ 135 struct task_struct; 136 struct mm_struct; 137 138 /* Free all resources held by a thread. */ 139 extern void release_thread(struct task_struct *); 140 141 /* Prepare to copy thread state - unlazy all lazy status */ 142 #define prepare_to_copy(tsk) do { } while (0) 143 144 /* 145 * create a kernel thread without removing it from tasklists 146 */ 147 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); 148 149 /* Copy and release all segment info associated with a VM */ 150 #define copy_segments(p, mm) do { } while(0) 151 #define release_segments(mm) do { } while(0) 152 153 /* 154 * FPU lazy state save handling. 155 */ 156 157 static __inline__ void disable_fpu(void) 158 { 159 unsigned long __dummy; 160 161 /* Set FD flag in SR */ 162 __asm__ __volatile__("stc sr, %0\n\t" 163 "or %1, %0\n\t" 164 "ldc %0, sr" 165 : "=&r" (__dummy) 166 : "r" (SR_FD)); 167 } 168 169 static __inline__ void enable_fpu(void) 170 { 171 unsigned long __dummy; 172 173 /* Clear out FD flag in SR */ 174 __asm__ __volatile__("stc sr, %0\n\t" 175 "and %1, %0\n\t" 176 "ldc %0, sr" 177 : "=&r" (__dummy) 178 : "r" (~SR_FD)); 179 } 180 181 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */ 182 #define FPSCR_INIT 0x00080000 183 184 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */ 185 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */ 186 187 /* 188 * Return saved PC of a blocked thread. 189 */ 190 #define thread_saved_pc(tsk) (tsk->thread.pc) 191 192 void show_trace(struct task_struct *tsk, unsigned long *sp, 193 struct pt_regs *regs); 194 extern unsigned long get_wchan(struct task_struct *p); 195 196 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) 197 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15]) 198 199 #define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory") 200 #define cpu_relax() barrier() 201 202 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \ 203 defined(CONFIG_CPU_SH4) 204 #define PREFETCH_STRIDE L1_CACHE_BYTES 205 #define ARCH_HAS_PREFETCH 206 #define ARCH_HAS_PREFETCHW 207 static inline void prefetch(void *x) 208 { 209 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory"); 210 } 211 212 #define prefetchw(x) prefetch(x) 213 #endif 214 215 #endif /* __KERNEL__ */ 216 #endif /* __ASM_SH_PROCESSOR_32_H */ 217