include/asm-sh64/processor.h

   1 #ifndef __ASM_SH64_PROCESSOR_H
   2 #define __ASM_SH64_PROCESSOR_H
   3
   4 /*
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  *
   9  * include/asm-sh64/processor.h
  10  *
  11  * Copyright (C) 2000, 2001  Paolo Alberelli
  12  * Copyright (C) 2003  Paul Mundt
  13  * Copyright (C) 2004  Richard Curnow
  14  *
  15  */
  16
  17 #include <asm/page.h>
  18
  19 #ifndef __ASSEMBLY__
  20
  21 #include <asm/types.h>
  22 #include <asm/cache.h>
  23 #include <asm/registers.h>
  24 #include <linux/threads.h>
  25
  26 /*
  27  * Default implementation of macro that returns current
  28  * instruction pointer ("program counter").
  29  */
  30 #define current_text_addr() ({ \
  31 void *pc; \
  32 unsigned long long __dummy = 0; \
  33 __asm__("gettr  tr0, %1\n\t" \
  34         "pta    4, tr0\n\t" \
  35         "gettr  tr0, %0\n\t" \
  36         "ptabs  %1, tr0\n\t"    \
  37         :"=r" (pc), "=r" (__dummy) \
  38         : "1" (__dummy)); \
  39 pc; })
  40
  41 /*
  42  *  CPU type and hardware bug flags. Kept separately for each CPU.
  43  */
  44 enum cpu_type {
  45         CPU_SH5_101,
  46         CPU_SH5_103,
  47         CPU_SH_NONE
  48 };
  49
  50 /*
  51  * TLB information structure
  52  *
  53  * Defined for both I and D tlb, per-processor.
  54  */
  55 struct tlb_info {
  56         unsigned long long next;
  57         unsigned long long first;
  58         unsigned long long last;
  59
  60         unsigned int entries;
  61         unsigned int step;
  62
  63         unsigned long flags;
  64 };
  65
  66 struct sh_cpuinfo {
  67         enum cpu_type type;
  68         unsigned long loops_per_jiffy;
  69
  70         char    hard_math;
  71
  72         unsigned long *pgd_quick;
  73         unsigned long *pmd_quick;
  74         unsigned long *pte_quick;
  75         unsigned long pgtable_cache_sz;
  76         unsigned int cpu_clock, master_clock, bus_clock, module_clock;
  77
  78         /* Cache info */
  79         struct cache_info icache;
  80         struct cache_info dcache;
  81
  82         /* TLB info */
  83         struct tlb_info itlb;
  84         struct tlb_info dtlb;
  85 };
  86
  87 extern struct sh_cpuinfo boot_cpu_data;
  88
  89 #define cpu_data (&boot_cpu_data)
  90 #define current_cpu_data boot_cpu_data
  91
  92 #endif
  93
  94 /*
  95  * User space process size: 2GB - 4k.
  96  */
  97 #define TASK_SIZE       0x7ffff000UL
  98
  99 /* This decides where the kernel will search for a free chunk of vm
 100  * space during mmap's.
 101  */
 102 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
 103
 104 /*
 105  * Bit of SR register
 106  *
 107  * FD-bit:
 108  *     When it's set, it means the processor doesn't have right to use FPU,
 109  *     and it results exception when the floating operation is executed.
 110  *
 111  * IMASK-bit:
 112  *     Interrupt level mask
 113  *
 114  * STEP-bit:
 115  *     Single step bit
 116  *
 117  */
 118 #define SR_FD    0x00008000
 119
 120 #if defined(CONFIG_SH64_SR_WATCH)
 121 #define SR_MMU   0x84000000
 122 #else
 123 #define SR_MMU   0x80000000
 124 #endif
 125
 126 #define SR_IMASK 0x000000f0
 127 #define SR_SSTEP 0x08000000
 128
 129 #ifndef __ASSEMBLY__
 130
 131 /*
 132  * FPU structure and data : require 8-byte alignment as we need to access it
 133    with fld.p, fst.p
 134  */
 135
 136 struct sh_fpu_hard_struct {
 137         unsigned long fp_regs[64];
 138         unsigned int fpscr;
 139         /* long status; * software status information */
 140 };
 141
 142 #if 0
 143 /* Dummy fpu emulator  */
 144 struct sh_fpu_soft_struct {
 145         unsigned long long fp_regs[32];
 146         unsigned int fpscr;
 147         unsigned char lookahead;
 148         unsigned long entry_pc;
 149 };
 150 #endif
 151
 152 union sh_fpu_union {
 153         struct sh_fpu_hard_struct hard;
 154         /* 'hard' itself only produces 32 bit alignment, yet we need
 155            to access it using 64 bit load/store as well. */
 156         unsigned long long alignment_dummy;
 157 };
 158
 159 struct thread_struct {
 160         unsigned long sp;
 161         unsigned long pc;
 162         /* This stores the address of the pt_regs built during a context
 163            switch, or of the register save area built for a kernel mode
 164            exception.  It is used for backtracing the stack of a sleeping task
 165            or one that traps in kernel mode. */
 166         struct pt_regs *kregs;
 167         /* This stores the address of the pt_regs constructed on entry from
 168            user mode.  It is a fixed value over the lifetime of a process, or
 169            NULL for a kernel thread. */
 170         struct pt_regs *uregs;
 171
 172         unsigned long trap_no, error_code;
 173         unsigned long address;
 174         /* Hardware debugging registers may come here */
 175
 176         /* floating point info */
 177         union sh_fpu_union fpu;
 178 };
 179
 180 #define INIT_MMAP \
 181 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
 182
 183 extern  struct pt_regs fake_swapper_regs;
 184
 185 #define INIT_THREAD  {                          \
 186         .sp             = sizeof(init_stack) +  \
 187                           (long) &init_stack,   \
 188         .pc             = 0,                    \
 189         .kregs          = &fake_swapper_regs,   \
 190         .uregs          = NULL,                 \
 191         .trap_no        = 0,                    \
 192         .error_code     = 0,                    \
 193         .address        = 0,                    \
 194         .fpu            = { { { 0, } }, }       \
 195 }
 196
 197 /*
 198  * Do necessary setup to start up a newly executed thread.
 199  */
 200 #define SR_USER (SR_MMU | SR_FD)
 201
 202 #define start_thread(regs, new_pc, new_sp)                      \
 203         set_fs(USER_DS);                                        \
 204         regs->sr = SR_USER;     /* User mode. */                \
 205         regs->pc = new_pc - 4;  /* Compensate syscall exit */   \
 206         regs->pc |= 1;          /* Set SHmedia ! */             \
 207         regs->regs[18] = 0;                                     \
 208         regs->regs[15] = new_sp
 209
 210 /* Forward declaration, a strange C thing */
 211 struct task_struct;
 212 struct mm_struct;
 213
 214 /* Free all resources held by a thread. */
 215 extern void release_thread(struct task_struct *);
 216 /*
 217  * create a kernel thread without removing it from tasklists
 218  */
 219 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 220
 221
 222 /* Copy and release all segment info associated with a VM */
 223 #define copy_segments(p, mm)    do { } while (0)
 224 #define release_segments(mm)    do { } while (0)
 225 #define forget_segments()       do { } while (0)
 226 #define prepare_to_copy(tsk)    do { } while (0)
 227 /*
 228  * FPU lazy state save handling.
 229  */
 230
 231 static inline void release_fpu(void)
 232 {
 233         unsigned long long __dummy;
 234
 235         /* Set FD flag in SR */
 236         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
 237                              "or        %0, %1, %0\n\t"
 238                              "putcon    %0, " __SR "\n\t"
 239                              : "=&r" (__dummy)
 240                              : "r" (SR_FD));
 241 }
 242
 243 static inline void grab_fpu(void)
 244 {
 245         unsigned long long __dummy;
 246
 247         /* Clear out FD flag in SR */
 248         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
 249                              "and       %0, %1, %0\n\t"
 250                              "putcon    %0, " __SR "\n\t"
 251                              : "=&r" (__dummy)
 252                              : "r" (~SR_FD));
 253 }
 254
 255 /* Round to nearest, no exceptions on inexact, overflow, underflow,
 256    zero-divide, invalid.  Configure option for whether to flush denorms to
 257    zero, or except if a denorm is encountered.  */
 258 #if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
 259 #define FPSCR_INIT  0x00040000
 260 #else
 261 #define FPSCR_INIT  0x00000000
 262 #endif
 263
 264 /* Save the current FP regs */
 265 void fpsave(struct sh_fpu_hard_struct *fpregs);
 266
 267 /* Initialise the FP state of a task */
 268 void fpinit(struct sh_fpu_hard_struct *fpregs);
 269
 270 extern struct task_struct *last_task_used_math;
 271
 272 /*
 273  * Return saved PC of a blocked thread.
 274  */
 275 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 276
 277 extern unsigned long get_wchan(struct task_struct *p);
 278
 279 #define KSTK_EIP(tsk)  ((tsk)->thread.pc)
 280 #define KSTK_ESP(tsk)  ((tsk)->thread.sp)
 281
 282 #define cpu_relax()     do { } while (0)
 283
 284 #endif  /* __ASSEMBLY__ */
 285 #endif /* __ASM_SH64_PROCESSOR_H */
 286