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 #ifdef __KERNEL__ 12 13 #include <linux/compiler.h> 14 #include <linux/linkage.h> 15 #include <asm/page.h> 16 #include <asm/types.h> 17 #include <asm/hw_breakpoint.h> 18 19 /* Core Processor Version Register */ 20 #define CCN_PVR 0xff000030 21 #define CCN_CVR 0xff000040 22 #define CCN_PRR 0xff000044 23 24 /* 25 * User space process size: 2GB. 26 * 27 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff 28 */ 29 #define TASK_SIZE 0x7c000000UL 30 31 #define STACK_TOP TASK_SIZE 32 #define STACK_TOP_MAX STACK_TOP 33 34 /* This decides where the kernel will search for a free chunk of vm 35 * space during mmap's. 36 */ 37 #define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3) 38 39 /* 40 * Bit of SR register 41 * 42 * FD-bit: 43 * When it's set, it means the processor doesn't have right to use FPU, 44 * and it results exception when the floating operation is executed. 45 * 46 * IMASK-bit: 47 * Interrupt level mask 48 */ 49 #define SR_DSP 0x00001000 50 #define SR_IMASK 0x000000f0 51 #define SR_FD 0x00008000 52 #define SR_MD 0x40000000 53 54 /* 55 * DSP structure and data 56 */ 57 struct sh_dsp_struct { 58 unsigned long dsp_regs[14]; 59 long status; 60 }; 61 62 /* 63 * FPU structure and data 64 */ 65 66 struct sh_fpu_hard_struct { 67 unsigned long fp_regs[16]; 68 unsigned long xfp_regs[16]; 69 unsigned long fpscr; 70 unsigned long fpul; 71 72 long status; /* software status information */ 73 }; 74 75 /* Dummy fpu emulator */ 76 struct sh_fpu_soft_struct { 77 unsigned long fp_regs[16]; 78 unsigned long xfp_regs[16]; 79 unsigned long fpscr; 80 unsigned long fpul; 81 82 unsigned char lookahead; 83 unsigned long entry_pc; 84 }; 85 86 union thread_xstate { 87 struct sh_fpu_hard_struct hardfpu; 88 struct sh_fpu_soft_struct softfpu; 89 }; 90 91 struct thread_struct { 92 /* Saved registers when thread is descheduled */ 93 unsigned long sp; 94 unsigned long pc; 95 96 /* Various thread flags, see SH_THREAD_xxx */ 97 unsigned long flags; 98 99 /* Save middle states of ptrace breakpoints */ 100 struct perf_event *ptrace_bps[HBP_NUM]; 101 102 #ifdef CONFIG_SH_DSP 103 /* Dsp status information */ 104 struct sh_dsp_struct dsp_status; 105 #endif 106 107 /* Extended processor state */ 108 union thread_xstate *xstate; 109 110 /* 111 * fpu_counter contains the number of consecutive context switches 112 * that the FPU is used. If this is over a threshold, the lazy fpu 113 * saving becomes unlazy to save the trap. This is an unsigned char 114 * so that after 256 times the counter wraps and the behavior turns 115 * lazy again; this to deal with bursty apps that only use FPU for 116 * a short time 117 */ 118 unsigned char fpu_counter; 119 }; 120 121 #define INIT_THREAD { \ 122 .sp = sizeof(init_stack) + (long) &init_stack, \ 123 .flags = 0, \ 124 } 125 126 /* Forward declaration, a strange C thing */ 127 struct task_struct; 128 129 extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp); 130 131 /* Free all resources held by a thread. */ 132 extern void release_thread(struct task_struct *); 133 134 /* 135 * FPU lazy state save handling. 136 */ 137 138 static __inline__ void disable_fpu(void) 139 { 140 unsigned long __dummy; 141 142 /* Set FD flag in SR */ 143 __asm__ __volatile__("stc sr, %0\n\t" 144 "or %1, %0\n\t" 145 "ldc %0, sr" 146 : "=&r" (__dummy) 147 : "r" (SR_FD)); 148 } 149 150 static __inline__ void enable_fpu(void) 151 { 152 unsigned long __dummy; 153 154 /* Clear out FD flag in SR */ 155 __asm__ __volatile__("stc sr, %0\n\t" 156 "and %1, %0\n\t" 157 "ldc %0, sr" 158 : "=&r" (__dummy) 159 : "r" (~SR_FD)); 160 } 161 162 /* Double presision, NANS as NANS, rounding to nearest, no exceptions */ 163 #define FPSCR_INIT 0x00080000 164 165 #define FPSCR_CAUSE_MASK 0x0001f000 /* Cause bits */ 166 #define FPSCR_FLAG_MASK 0x0000007c /* Flag bits */ 167 168 /* 169 * Return saved PC of a blocked thread. 170 */ 171 #define thread_saved_pc(tsk) (tsk->thread.pc) 172 173 void show_trace(struct task_struct *tsk, unsigned long *sp, 174 struct pt_regs *regs); 175 176 #ifdef CONFIG_DUMP_CODE 177 void show_code(struct pt_regs *regs); 178 #else 179 static inline void show_code(struct pt_regs *regs) 180 { 181 } 182 #endif 183 184 extern unsigned long get_wchan(struct task_struct *p); 185 186 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) 187 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[15]) 188 189 #if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4) 190 191 #define PREFETCH_STRIDE L1_CACHE_BYTES 192 #define ARCH_HAS_PREFETCH 193 #define ARCH_HAS_PREFETCHW 194 195 static inline void prefetch(const void *x) 196 { 197 __builtin_prefetch(x, 0, 3); 198 } 199 200 static inline void prefetchw(const void *x) 201 { 202 __builtin_prefetch(x, 1, 3); 203 } 204 #endif 205 206 #endif /* __KERNEL__ */ 207 #endif /* __ASM_SH_PROCESSOR_32_H */ 208