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 <linux/linkage.h> 14 #include <asm/page.h> 15 #include <asm/types.h> 16 #include <asm/hw_breakpoint.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 /* 30 * User space process size: 2GB. 31 * 32 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff 33 */ 34 #define TASK_SIZE 0x7c000000UL 35 36 #define STACK_TOP TASK_SIZE 37 #define STACK_TOP_MAX STACK_TOP 38 39 /* This decides where the kernel will search for a free chunk of vm 40 * space during mmap's. 41 */ 42 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 43 44 /* 45 * Bit of SR register 46 * 47 * FD-bit: 48 * When it's set, it means the processor doesn't have right to use FPU, 49 * and it results exception when the floating operation is executed. 50 * 51 * IMASK-bit: 52 * Interrupt level mask 53 */ 54 #define SR_DSP 0x00001000 55 #define SR_IMASK 0x000000f0 56 #define SR_FD 0x00008000 57 #define SR_MD 0x40000000 58 59 /* 60 * DSP structure and data 61 */ 62 struct sh_dsp_struct { 63 unsigned long dsp_regs[14]; 64 long status; 65 }; 66 67 /* 68 * FPU structure and data 69 */ 70 71 struct sh_fpu_hard_struct { 72 unsigned long fp_regs[16]; 73 unsigned long xfp_regs[16]; 74 unsigned long fpscr; 75 unsigned long fpul; 76 77 long status; /* software status information */ 78 }; 79 80 /* Dummy fpu emulator */ 81 struct sh_fpu_soft_struct { 82 unsigned long fp_regs[16]; 83 unsigned long xfp_regs[16]; 84 unsigned long fpscr; 85 unsigned long fpul; 86 87 unsigned char lookahead; 88 unsigned long entry_pc; 89 }; 90 91 union thread_xstate { 92 struct sh_fpu_hard_struct hardfpu; 93 struct sh_fpu_soft_struct softfpu; 94 }; 95 96 struct thread_struct { 97 /* Saved registers when thread is descheduled */ 98 unsigned long sp; 99 unsigned long pc; 100 101 /* Various thread flags, see SH_THREAD_xxx */ 102 unsigned long flags; 103 104 /* Save middle states of ptrace breakpoints */ 105 struct perf_event *ptrace_bps[HBP_NUM]; 106 107 #ifdef CONFIG_SH_DSP 108 /* Dsp status information */ 109 struct sh_dsp_struct dsp_status; 110 #endif 111 112 /* Extended processor state */ 113 union thread_xstate *xstate; 114 }; 115 116 #define INIT_THREAD { \ 117 .sp = sizeof(init_stack) + (long) &init_stack, \ 118 .flags = 0, \ 119 } 120 121 /* Forward declaration, a strange C thing */ 122 struct task_struct; 123 124 extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp); 125 126 /* Free all resources held by a thread. */ 127 extern void release_thread(struct task_struct *); 128 129 /* 130 * create a kernel thread without removing it from tasklists 131 */ 132 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); 133 134 /* Copy and release all segment info associated with a VM */ 135 #define copy_segments(p, mm) do { } while(0) 136 #define release_segments(mm) do { } while(0) 137 138 /* 139 * FPU lazy state save handling. 140 */ 141 142 static __inline__ void disable_fpu(void) 143 { 144 unsigned long __dummy; 145 146 /* Set FD flag in SR */ 147 __asm__ __volatile__("stc sr, %0\n\t" 148 "or %1, %0\n\t" 149 "ldc %0, sr" 150 : "=&r" (__dummy) 151 : "r" (SR_FD)); 152 } 153 154 static __inline__ void enable_fpu(void) 155 { 156 unsigned long __dummy; 157 158 /* Clear out FD flag in SR */ 159 __asm__ __volatile__("stc sr, %0\n\t" 160 "and %1, %0\n\t" 161 "ldc %0, sr" 162 : "=&r" (__dummy) 163 : "r" (~SR_FD)); 164 } 165 166 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */ 167 #define FPSCR_INIT 0x00080000 168 169 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */ 170 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */ 171 172 /* 173 * Return saved PC of a blocked thread. 174 */ 175 #define thread_saved_pc(tsk) (tsk->thread.pc) 176 177 void show_trace(struct task_struct *tsk, unsigned long *sp, 178 struct pt_regs *regs); 179 180 #ifdef CONFIG_DUMP_CODE 181 void show_code(struct pt_regs *regs); 182 #else 183 static inline void show_code(struct pt_regs *regs) 184 { 185 } 186 #endif 187 188 extern unsigned long get_wchan(struct task_struct *p); 189 190 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) 191 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15]) 192 193 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4) 194 195 #define PREFETCH_STRIDE L1_CACHE_BYTES 196 #define ARCH_HAS_PREFETCH 197 #define ARCH_HAS_PREFETCHW 198 199 static inline void prefetch(const void *x) 200 { 201 __builtin_prefetch(x, 0, 3); 202 } 203 204 static inline void prefetchw(const void *x) 205 { 206 __builtin_prefetch(x, 1, 3); 207 } 208 #endif 209 210 #endif /* __KERNEL__ */ 211 #endif /* __ASM_SH_PROCESSOR_32_H */ 212