arch/sh/include/asm/processor_32.h

   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 */