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_H 9#define __ASM_SH_PROCESSOR_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#include <asm/cpu-features.h> 18 19/* 20 * Default implementation of macro that returns current 21 * instruction pointer ("program counter"). 22 */ 23#define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n1:":"=z" (pc)); pc; }) 24 25/* Core Processor Version Register */ 26#define CCN_PVR 0xff000030 27#define CCN_CVR 0xff000040 28#define CCN_PRR 0xff000044 29 30/* 31 * CPU type and hardware bug flags. Kept separately for each CPU. 32 * 33 * Each one of these also needs a CONFIG_CPU_SUBTYPE_xxx entry 34 * in arch/sh/mm/Kconfig, as well as an entry in arch/sh/kernel/setup.c 35 * for parsing the subtype in get_cpu_subtype(). 36 */ 37enum cpu_type { 38 /* SH-2 types */ 39 CPU_SH7604, CPU_SH7619, 40 41 /* SH-2A types */ 42 CPU_SH7206, 43 44 /* SH-3 types */ 45 CPU_SH7705, CPU_SH7706, CPU_SH7707, 46 CPU_SH7708, CPU_SH7708S, CPU_SH7708R, 47 CPU_SH7709, CPU_SH7709A, CPU_SH7710, CPU_SH7712, 48 CPU_SH7729, CPU_SH7300, 49 50 /* SH-4 types */ 51 CPU_SH7750, CPU_SH7750S, CPU_SH7750R, CPU_SH7751, CPU_SH7751R, 52 CPU_SH7760, CPU_ST40RA, CPU_ST40GX1, CPU_SH4_202, CPU_SH4_501, 53 54 /* SH-4A types */ 55 CPU_SH7770, CPU_SH7780, CPU_SH7781, CPU_SH7785, 56 57 /* SH4AL-DSP types */ 58 CPU_SH73180, CPU_SH7343, CPU_SH7722, 59 60 /* Unknown subtype */ 61 CPU_SH_NONE 62}; 63 64struct sh_cpuinfo { 65 unsigned int type; 66 unsigned long loops_per_jiffy; 67 unsigned long asid_cache; 68 69 struct cache_info icache; /* Primary I-cache */ 70 struct cache_info dcache; /* Primary D-cache */ 71 struct cache_info scache; /* Secondary cache */ 72 73 unsigned long flags; 74} __attribute__ ((aligned(SMP_CACHE_BYTES))); 75 76extern struct sh_cpuinfo boot_cpu_data; 77 78#ifdef CONFIG_SMP 79extern struct sh_cpuinfo cpu_data[]; 80#define current_cpu_data cpu_data[smp_processor_id()] 81#else 82#define cpu_data (&boot_cpu_data) 83#define current_cpu_data boot_cpu_data 84#endif 85 86/* 87 * User space process size: 2GB. 88 * 89 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff 90 */ 91#define TASK_SIZE 0x7c000000UL 92 93/* This decides where the kernel will search for a free chunk of vm 94 * space during mmap's. 95 */ 96#define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 97 98/* 99 * Bit of SR register 100 * 101 * FD-bit: 102 * When it's set, it means the processor doesn't have right to use FPU, 103 * and it results exception when the floating operation is executed. 104 * 105 * IMASK-bit: 106 * Interrupt level mask 107 */ 108#define SR_FD 0x00008000 109#define SR_DSP 0x00001000 110#define SR_IMASK 0x000000f0 111 112/* 113 * FPU structure and data 114 */ 115 116struct sh_fpu_hard_struct { 117 unsigned long fp_regs[16]; 118 unsigned long xfp_regs[16]; 119 unsigned long fpscr; 120 unsigned long fpul; 121 122 long status; /* software status information */ 123}; 124 125/* Dummy fpu emulator */ 126struct sh_fpu_soft_struct { 127 unsigned long fp_regs[16]; 128 unsigned long xfp_regs[16]; 129 unsigned long fpscr; 130 unsigned long fpul; 131 132 unsigned char lookahead; 133 unsigned long entry_pc; 134}; 135 136union sh_fpu_union { 137 struct sh_fpu_hard_struct hard; 138 struct sh_fpu_soft_struct soft; 139}; 140 141struct thread_struct { 142 /* Saved registers when thread is descheduled */ 143 unsigned long sp; 144 unsigned long pc; 145 146 /* Hardware debugging registers */ 147 unsigned long ubc_pc; 148 149 /* floating point info */ 150 union sh_fpu_union fpu; 151}; 152 153typedef struct { 154 unsigned long seg; 155} mm_segment_t; 156 157/* Count of active tasks with UBC settings */ 158extern int ubc_usercnt; 159 160#define INIT_THREAD { \ 161 .sp = sizeof(init_stack) + (long) &init_stack, \ 162} 163 164/* 165 * Do necessary setup to start up a newly executed thread. 166 */ 167#define start_thread(regs, new_pc, new_sp) \ 168 set_fs(USER_DS); \ 169 regs->pr = 0; \ 170 regs->sr = SR_FD; /* User mode. */ \ 171 regs->pc = new_pc; \ 172 regs->regs[15] = new_sp 173 174/* Forward declaration, a strange C thing */ 175struct task_struct; 176struct mm_struct; 177 178/* Free all resources held by a thread. */ 179extern void release_thread(struct task_struct *); 180 181/* Prepare to copy thread state - unlazy all lazy status */ 182#define prepare_to_copy(tsk) do { } while (0) 183 184/* 185 * create a kernel thread without removing it from tasklists 186 */ 187extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); 188 189/* Copy and release all segment info associated with a VM */ 190#define copy_segments(p, mm) do { } while(0) 191#define release_segments(mm) do { } while(0) 192 193/* 194 * FPU lazy state save handling. 195 */ 196 197static __inline__ void disable_fpu(void) 198{ 199 unsigned long __dummy; 200 201 /* Set FD flag in SR */ 202 __asm__ __volatile__("stc sr, %0\n\t" 203 "or %1, %0\n\t" 204 "ldc %0, sr" 205 : "=&r" (__dummy) 206 : "r" (SR_FD)); 207} 208 209static __inline__ void enable_fpu(void) 210{ 211 unsigned long __dummy; 212 213 /* Clear out FD flag in SR */ 214 __asm__ __volatile__("stc sr, %0\n\t" 215 "and %1, %0\n\t" 216 "ldc %0, sr" 217 : "=&r" (__dummy) 218 : "r" (~SR_FD)); 219} 220 221static __inline__ void release_fpu(struct pt_regs *regs) 222{ 223 regs->sr |= SR_FD; 224} 225 226static __inline__ void grab_fpu(struct pt_regs *regs) 227{ 228 regs->sr &= ~SR_FD; 229} 230 231#ifdef CONFIG_CPU_SH4 232extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs); 233#else 234#define save_fpu(tsk) do { } while (0) 235#endif 236 237#define unlazy_fpu(tsk, regs) do { \ 238 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \ 239 save_fpu(tsk, regs); \ 240 } \ 241} while (0) 242 243#define clear_fpu(tsk, regs) do { \ 244 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { \ 245 clear_tsk_thread_flag(tsk, TIF_USEDFPU); \ 246 release_fpu(regs); \ 247 } \ 248} while (0) 249 250/* Double presision, NANS as NANS, rounding to nearest, no exceptions */ 251#define FPSCR_INIT 0x00080000 252 253#define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */ 254#define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */ 255 256/* 257 * Return saved PC of a blocked thread. 258 */ 259#define thread_saved_pc(tsk) (tsk->thread.pc) 260 261void show_trace(struct task_struct *tsk, unsigned long *sp, 262 struct pt_regs *regs); 263extern unsigned long get_wchan(struct task_struct *p); 264 265#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) 266#define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15]) 267 268#define cpu_sleep() __asm__ __volatile__ ("sleep" : : : "memory") 269#define cpu_relax() barrier() 270 271#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4) 272#define PREFETCH_STRIDE L1_CACHE_BYTES 273#define ARCH_HAS_PREFETCH 274#define ARCH_HAS_PREFETCHW 275static inline void prefetch(void *x) 276{ 277 __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory"); 278} 279 280#define prefetchw(x) prefetch(x) 281#endif 282 283#ifdef CONFIG_VSYSCALL 284extern int vsyscall_init(void); 285#else 286#define vsyscall_init() do { } while (0) 287#endif 288 289/* arch/sh/kernel/setup.c */ 290const char *get_cpu_subtype(struct sh_cpuinfo *c); 291 292#endif /* __KERNEL__ */ 293#endif /* __ASM_SH_PROCESSOR_H */ 294