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 #include <linux/compiler.h>
  26
  27 /*
  28  * Default implementation of macro that returns current
  29  * instruction pointer ("program counter").
  30  */
  31 #define current_text_addr() ({ \
  32 void *pc; \
  33 unsigned long long __dummy = 0; \
  34 __asm__("gettr  tr0, %1\n\t" \
  35         "pta    4, tr0\n\t" \
  36         "gettr  tr0, %0\n\t" \
  37         "ptabs  %1, tr0\n\t"    \
  38         :"=r" (pc), "=r" (__dummy) \
  39         : "1" (__dummy)); \
  40 pc; })
  41
  42 /*
  43  *  CPU type and hardware bug flags. Kept separately for each CPU.
  44  */
  45 enum cpu_type {
  46         CPU_SH5_101,
  47         CPU_SH5_103,
  48         CPU_SH_NONE
  49 };
  50
  51 /*
  52  * TLB information structure
  53  *
  54  * Defined for both I and D tlb, per-processor.
  55  */
  56 struct tlb_info {
  57         unsigned long long next;
  58         unsigned long long first;
  59         unsigned long long last;
  60
  61         unsigned int entries;
  62         unsigned int step;
  63
  64         unsigned long flags;
  65 };
  66
  67 struct sh_cpuinfo {
  68         enum cpu_type type;
  69         unsigned long loops_per_jiffy;
  70
  71         char    hard_math;
  72
  73         unsigned long *pgd_quick;
  74         unsigned long *pmd_quick;
  75         unsigned long *pte_quick;
  76         unsigned long pgtable_cache_sz;
  77         unsigned int cpu_clock, master_clock, bus_clock, module_clock;
  78
  79         /* Cache info */
  80         struct cache_info icache;
  81         struct cache_info dcache;
  82
  83         /* TLB info */
  84         struct tlb_info itlb;
  85         struct tlb_info dtlb;
  86 };
  87
  88 extern struct sh_cpuinfo boot_cpu_data;
  89
  90 #define cpu_data (&boot_cpu_data)
  91 #define current_cpu_data boot_cpu_data
  92
  93 #endif
  94
  95 /*
  96  * User space process size: 2GB - 4k.
  97  */
  98 #define TASK_SIZE       0x7ffff000UL
  99
 100 /* This decides where the kernel will search for a free chunk of vm
 101  * space during mmap's.
 102  */
 103 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
 104
 105 /*
 106  * Bit of SR register
 107  *
 108  * FD-bit:
 109  *     When it's set, it means the processor doesn't have right to use FPU,
 110  *     and it results exception when the floating operation is executed.
 111  *
 112  * IMASK-bit:
 113  *     Interrupt level mask
 114  *
 115  * STEP-bit:
 116  *     Single step bit
 117  *
 118  */
 119 #define SR_FD    0x00008000
 120
 121 #if defined(CONFIG_SH64_SR_WATCH)
 122 #define SR_MMU   0x84000000
 123 #else
 124 #define SR_MMU   0x80000000
 125 #endif
 126
 127 #define SR_IMASK 0x000000f0
 128 #define SR_SSTEP 0x08000000
 129
 130 #ifndef __ASSEMBLY__
 131
 132 /*
 133  * FPU structure and data : require 8-byte alignment as we need to access it
 134    with fld.p, fst.p
 135  */
 136
 137 struct sh_fpu_hard_struct {
 138         unsigned long fp_regs[64];
 139         unsigned int fpscr;
 140         /* long status; * software status information */
 141 };
 142
 143 #if 0
 144 /* Dummy fpu emulator  */
 145 struct sh_fpu_soft_struct {
 146         unsigned long long fp_regs[32];
 147         unsigned int fpscr;
 148         unsigned char lookahead;
 149         unsigned long entry_pc;
 150 };
 151 #endif
 152
 153 union sh_fpu_union {
 154         struct sh_fpu_hard_struct hard;
 155         /* 'hard' itself only produces 32 bit alignment, yet we need
 156            to access it using 64 bit load/store as well. */
 157         unsigned long long alignment_dummy;
 158 };
 159
 160 struct thread_struct {
 161         unsigned long sp;
 162         unsigned long pc;
 163         /* This stores the address of the pt_regs built during a context
 164            switch, or of the register save area built for a kernel mode
 165            exception.  It is used for backtracing the stack of a sleeping task
 166            or one that traps in kernel mode. */
 167         struct pt_regs *kregs;
 168         /* This stores the address of the pt_regs constructed on entry from
 169            user mode.  It is a fixed value over the lifetime of a process, or
 170            NULL for a kernel thread. */
 171         struct pt_regs *uregs;
 172
 173         unsigned long trap_no, error_code;
 174         unsigned long address;
 175         /* Hardware debugging registers may come here */
 176
 177         /* floating point info */
 178         union sh_fpu_union fpu;
 179 };
 180
 181 #define INIT_MMAP \
 182 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
 183
 184 extern  struct pt_regs fake_swapper_regs;
 185
 186 #define INIT_THREAD  {                          \
 187         .sp             = sizeof(init_stack) +  \
 188                           (long) &init_stack,   \
 189         .pc             = 0,                    \
 190         .kregs          = &fake_swapper_regs,   \
 191         .uregs          = NULL,                 \
 192         .trap_no        = 0,                    \
 193         .error_code     = 0,                    \
 194         .address        = 0,                    \
 195         .fpu            = { { { 0, } }, }       \
 196 }
 197
 198 /*
 199  * Do necessary setup to start up a newly executed thread.
 200  */
 201 #define SR_USER (SR_MMU | SR_FD)
 202
 203 #define start_thread(regs, new_pc, new_sp)                      \
 204         set_fs(USER_DS);                                        \
 205         regs->sr = SR_USER;     /* User mode. */                \
 206         regs->pc = new_pc - 4;  /* Compensate syscall exit */   \
 207         regs->pc |= 1;          /* Set SHmedia ! */             \
 208         regs->regs[18] = 0;                                     \
 209         regs->regs[15] = new_sp
 210
 211 /* Forward declaration, a strange C thing */
 212 struct task_struct;
 213 struct mm_struct;
 214
 215 /* Free all resources held by a thread. */
 216 extern void release_thread(struct task_struct *);
 217 /*
 218  * create a kernel thread without removing it from tasklists
 219  */
 220 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 221
 222
 223 /* Copy and release all segment info associated with a VM */
 224 #define copy_segments(p, mm)    do { } while (0)
 225 #define release_segments(mm)    do { } while (0)
 226 #define forget_segments()       do { } while (0)
 227 #define prepare_to_copy(tsk)    do { } while (0)
 228 /*
 229  * FPU lazy state save handling.
 230  */
 231
 232 static inline void release_fpu(void)
 233 {
 234         unsigned long long __dummy;
 235
 236         /* Set FD flag in SR */
 237         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
 238                              "or        %0, %1, %0\n\t"
 239                              "putcon    %0, " __SR "\n\t"
 240                              : "=&r" (__dummy)
 241                              : "r" (SR_FD));
 242 }
 243
 244 static inline void grab_fpu(void)
 245 {
 246         unsigned long long __dummy;
 247
 248         /* Clear out FD flag in SR */
 249         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
 250                              "and       %0, %1, %0\n\t"
 251                              "putcon    %0, " __SR "\n\t"
 252                              : "=&r" (__dummy)
 253                              : "r" (~SR_FD));
 254 }
 255
 256 /* Round to nearest, no exceptions on inexact, overflow, underflow,
 257    zero-divide, invalid.  Configure option for whether to flush denorms to
 258    zero, or except if a denorm is encountered.  */
 259 #if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
 260 #define FPSCR_INIT  0x00040000
 261 #else
 262 #define FPSCR_INIT  0x00000000
 263 #endif
 264
 265 /* Save the current FP regs */
 266 void fpsave(struct sh_fpu_hard_struct *fpregs);
 267
 268 /* Initialise the FP state of a task */
 269 void fpinit(struct sh_fpu_hard_struct *fpregs);
 270
 271 extern struct task_struct *last_task_used_math;
 272
 273 /*
 274  * Return saved PC of a blocked thread.
 275  */
 276 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 277
 278 extern unsigned long get_wchan(struct task_struct *p);
 279
 280 #define KSTK_EIP(tsk)  ((tsk)->thread.pc)
 281 #define KSTK_ESP(tsk)  ((tsk)->thread.sp)
 282
 283 #define cpu_relax()     barrier()
 284
 285 #endif  /* __ASSEMBLY__ */
 286 #endif /* __ASM_SH64_PROCESSOR_H */
 287