1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * include/asm-sh/processor.h 4 * 5 * Copyright (C) 1999, 2000 Niibe Yutaka 6 * Copyright (C) 2002, 2003 Paul Mundt 7 */ 8 9 #ifndef __ASM_SH_PROCESSOR_32_H 10 #define __ASM_SH_PROCESSOR_32_H 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 /* Core Processor Version Register */ 19 #define CCN_PVR 0xff000030 20 #define CCN_CVR 0xff000040 21 #define CCN_PRR 0xff000044 22 23 /* 24 * User space process size: 2GB. 25 * 26 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff 27 */ 28 #define TASK_SIZE 0x7c000000UL 29 30 #define STACK_TOP TASK_SIZE 31 #define STACK_TOP_MAX STACK_TOP 32 33 /* This decides where the kernel will search for a free chunk of vm 34 * space during mmap's. 35 */ 36 #define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3) 37 38 /* 39 * Bit of SR register 40 * 41 * FD-bit: 42 * When it's set, it means the processor doesn't have right to use FPU, 43 * and it results exception when the floating operation is executed. 44 * 45 * IMASK-bit: 46 * Interrupt level mask 47 */ 48 #define SR_DSP 0x00001000 49 #define SR_IMASK 0x000000f0 50 #define SR_FD 0x00008000 51 #define SR_MD 0x40000000 52 53 /* 54 * DSP structure and data 55 */ 56 struct sh_dsp_struct { 57 unsigned long dsp_regs[14]; 58 long status; 59 }; 60 61 /* 62 * FPU structure and data 63 */ 64 65 struct sh_fpu_hard_struct { 66 unsigned long fp_regs[16]; 67 unsigned long xfp_regs[16]; 68 unsigned long fpscr; 69 unsigned long fpul; 70 71 long status; /* software status information */ 72 }; 73 74 /* Dummy fpu emulator */ 75 struct sh_fpu_soft_struct { 76 unsigned long fp_regs[16]; 77 unsigned long xfp_regs[16]; 78 unsigned long fpscr; 79 unsigned long fpul; 80 81 unsigned char lookahead; 82 unsigned long entry_pc; 83 }; 84 85 union thread_xstate { 86 struct sh_fpu_hard_struct hardfpu; 87 struct sh_fpu_soft_struct softfpu; 88 }; 89 90 struct thread_struct { 91 /* Saved registers when thread is descheduled */ 92 unsigned long sp; 93 unsigned long pc; 94 95 /* Various thread flags, see SH_THREAD_xxx */ 96 unsigned long flags; 97 98 /* Save middle states of ptrace breakpoints */ 99 struct perf_event *ptrace_bps[HBP_NUM]; 100 101 #ifdef CONFIG_SH_DSP 102 /* Dsp status information */ 103 struct sh_dsp_struct dsp_status; 104 #endif 105 106 /* Extended processor state */ 107 union thread_xstate *xstate; 108 109 /* 110 * fpu_counter contains the number of consecutive context switches 111 * that the FPU is used. If this is over a threshold, the lazy fpu 112 * saving becomes unlazy to save the trap. This is an unsigned char 113 * so that after 256 times the counter wraps and the behavior turns 114 * lazy again; this to deal with bursty apps that only use FPU for 115 * a short time 116 */ 117 unsigned char fpu_counter; 118 }; 119 120 #define INIT_THREAD { \ 121 .sp = sizeof(init_stack) + (long) &init_stack, \ 122 .flags = 0, \ 123 } 124 125 /* Forward declaration, a strange C thing */ 126 struct task_struct; 127 128 extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp); 129 130 /* Free all resources held by a thread. */ 131 extern void release_thread(struct task_struct *); 132 133 /* 134 * FPU lazy state save handling. 135 */ 136 137 static __inline__ void disable_fpu(void) 138 { 139 unsigned long __dummy; 140 141 /* Set FD flag in SR */ 142 __asm__ __volatile__("stc sr, %0\n\t" 143 "or %1, %0\n\t" 144 "ldc %0, sr" 145 : "=&r" (__dummy) 146 : "r" (SR_FD)); 147 } 148 149 static __inline__ void enable_fpu(void) 150 { 151 unsigned long __dummy; 152 153 /* Clear out FD flag in SR */ 154 __asm__ __volatile__("stc sr, %0\n\t" 155 "and %1, %0\n\t" 156 "ldc %0, sr" 157 : "=&r" (__dummy) 158 : "r" (~SR_FD)); 159 } 160 161 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */ 162 #define FPSCR_INIT 0x00080000 163 164 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */ 165 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */ 166 167 /* 168 * Return saved PC of a blocked thread. 169 */ 170 #define thread_saved_pc(tsk) (tsk->thread.pc) 171 172 void show_trace(struct task_struct *tsk, unsigned long *sp, 173 struct pt_regs *regs, const char *loglvl); 174 175 #ifdef CONFIG_DUMP_CODE 176 void show_code(struct pt_regs *regs); 177 #else 178 static inline void show_code(struct pt_regs *regs) 179 { 180 } 181 #endif 182 183 extern unsigned long get_wchan(struct task_struct *p); 184 185 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) 186 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15]) 187 188 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4) 189 190 #define PREFETCH_STRIDE L1_CACHE_BYTES 191 #define ARCH_HAS_PREFETCH 192 #define ARCH_HAS_PREFETCHW 193 194 static inline void prefetch(const void *x) 195 { 196 __builtin_prefetch(x, 0, 3); 197 } 198 199 static inline void prefetchw(const void *x) 200 { 201 __builtin_prefetch(x, 1, 3); 202 } 203 #endif 204 205 #endif /* __ASM_SH_PROCESSOR_32_H */ 206