include/asm-sh/processor_64.h

   1 #ifndef __ASM_SH_PROCESSOR_64_H
   2 #define __ASM_SH_PROCESSOR_64_H
   3
   4 /*
   5  * include/asm-sh/processor_64.h
   6  *
   7  * Copyright (C) 2000, 2001  Paolo Alberelli
   8  * Copyright (C) 2003  Paul Mundt
   9  * Copyright (C) 2004  Richard Curnow
  10  *
  11  * This file is subject to the terms and conditions of the GNU General Public
  12  * License.  See the file "COPYING" in the main directory of this archive
  13  * for more details.
  14  */
  15 #ifndef __ASSEMBLY__
  16
  17 #include <linux/compiler.h>
  18 #include <asm/page.h>
  19 #include <asm/types.h>
  20 #include <asm/cache.h>
  21 #include <asm/ptrace.h>
  22 #include <asm/cpu/registers.h>
  23
  24 /*
  25  * Default implementation of macro that returns current
  26  * instruction pointer ("program counter").
  27  */
  28 #define current_text_addr() ({ \
  29 void *pc; \
  30 unsigned long long __dummy = 0; \
  31 __asm__("gettr  tr0, %1\n\t" \
  32         "pta    4, tr0\n\t" \
  33         "gettr  tr0, %0\n\t" \
  34         "ptabs  %1, tr0\n\t"    \
  35         :"=r" (pc), "=r" (__dummy) \
  36         : "1" (__dummy)); \
  37 pc; })
  38
  39 /*
  40  * TLB information structure
  41  *
  42  * Defined for both I and D tlb, per-processor.
  43  */
  44 struct tlb_info {
  45         unsigned long long next;
  46         unsigned long long first;
  47         unsigned long long last;
  48
  49         unsigned int entries;
  50         unsigned int step;
  51
  52         unsigned long flags;
  53 };
  54
  55 struct sh_cpuinfo {
  56         enum cpu_type type;
  57         unsigned long loops_per_jiffy;
  58         unsigned long asid_cache;
  59
  60         unsigned int cpu_clock, master_clock, bus_clock, module_clock;
  61
  62         /* Cache info */
  63         struct cache_info icache;
  64         struct cache_info dcache;
  65         struct cache_info scache;
  66
  67         /* TLB info */
  68         struct tlb_info itlb;
  69         struct tlb_info dtlb;
  70
  71         unsigned long flags;
  72 };
  73
  74 extern struct sh_cpuinfo cpu_data[];
  75 #define boot_cpu_data cpu_data[0]
  76 #define current_cpu_data cpu_data[smp_processor_id()]
  77 #define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
  78
  79 #endif
  80
  81 /*
  82  * User space process size: 2GB - 4k.
  83  */
  84 #define TASK_SIZE       0x7ffff000UL
  85
  86 #define STACK_TOP       TASK_SIZE
  87 #define STACK_TOP_MAX   STACK_TOP
  88
  89 /* This decides where the kernel will search for a free chunk of vm
  90  * space during mmap's.
  91  */
  92 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
  93
  94 /*
  95  * Bit of SR register
  96  *
  97  * FD-bit:
  98  *     When it's set, it means the processor doesn't have right to use FPU,
  99  *     and it results exception when the floating operation is executed.
 100  *
 101  * IMASK-bit:
 102  *     Interrupt level mask
 103  *
 104  * STEP-bit:
 105  *     Single step bit
 106  *
 107  */
 108 #if defined(CONFIG_SH64_SR_WATCH)
 109 #define SR_MMU   0x84000000
 110 #else
 111 #define SR_MMU   0x80000000
 112 #endif
 113
 114 #define SR_IMASK 0x000000f0
 115 #define SR_SSTEP 0x08000000
 116
 117 #ifndef __ASSEMBLY__
 118
 119 /*
 120  * FPU structure and data : require 8-byte alignment as we need to access it
 121    with fld.p, fst.p
 122  */
 123
 124 struct sh_fpu_hard_struct {
 125         unsigned long fp_regs[64];
 126         unsigned int fpscr;
 127         /* long status; * software status information */
 128 };
 129
 130 #if 0
 131 /* Dummy fpu emulator  */
 132 struct sh_fpu_soft_struct {
 133         unsigned long long fp_regs[32];
 134         unsigned int fpscr;
 135         unsigned char lookahead;
 136         unsigned long entry_pc;
 137 };
 138 #endif
 139
 140 union sh_fpu_union {
 141         struct sh_fpu_hard_struct hard;
 142         /* 'hard' itself only produces 32 bit alignment, yet we need
 143            to access it using 64 bit load/store as well. */
 144         unsigned long long alignment_dummy;
 145 };
 146
 147 struct thread_struct {
 148         unsigned long sp;
 149         unsigned long pc;
 150         /* This stores the address of the pt_regs built during a context
 151            switch, or of the register save area built for a kernel mode
 152            exception.  It is used for backtracing the stack of a sleeping task
 153            or one that traps in kernel mode. */
 154         struct pt_regs *kregs;
 155         /* This stores the address of the pt_regs constructed on entry from
 156            user mode.  It is a fixed value over the lifetime of a process, or
 157            NULL for a kernel thread. */
 158         struct pt_regs *uregs;
 159
 160         unsigned long trap_no, error_code;
 161         unsigned long address;
 162         /* Hardware debugging registers may come here */
 163
 164         /* floating point info */
 165         union sh_fpu_union fpu;
 166 };
 167
 168 typedef struct {
 169         unsigned long seg;
 170 } mm_segment_t;
 171
 172 #define INIT_MMAP \
 173 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
 174
 175 extern  struct pt_regs fake_swapper_regs;
 176
 177 #define INIT_THREAD  {                          \
 178         .sp             = sizeof(init_stack) +  \
 179                           (long) &init_stack,   \
 180         .pc             = 0,                    \
 181         .kregs          = &fake_swapper_regs,   \
 182         .uregs          = NULL,                 \
 183         .trap_no        = 0,                    \
 184         .error_code     = 0,                    \
 185         .address        = 0,                    \
 186         .fpu            = { { { 0, } }, }       \
 187 }
 188
 189 /*
 190  * Do necessary setup to start up a newly executed thread.
 191  */
 192 #define SR_USER (SR_MMU | SR_FD)
 193
 194 #define start_thread(regs, new_pc, new_sp)                      \
 195         set_fs(USER_DS);                                        \
 196         regs->sr = SR_USER;     /* User mode. */                \
 197         regs->pc = new_pc - 4;  /* Compensate syscall exit */   \
 198         regs->pc |= 1;          /* Set SHmedia ! */             \
 199         regs->regs[18] = 0;                                     \
 200         regs->regs[15] = new_sp
 201
 202 /* Forward declaration, a strange C thing */
 203 struct task_struct;
 204 struct mm_struct;
 205
 206 /* Free all resources held by a thread. */
 207 extern void release_thread(struct task_struct *);
 208 /*
 209  * create a kernel thread without removing it from tasklists
 210  */
 211 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 212
 213
 214 /* Copy and release all segment info associated with a VM */
 215 #define copy_segments(p, mm)    do { } while (0)
 216 #define release_segments(mm)    do { } while (0)
 217 #define forget_segments()       do { } while (0)
 218 #define prepare_to_copy(tsk)    do { } while (0)
 219 /*
 220  * FPU lazy state save handling.
 221  */
 222
 223 static inline void disable_fpu(void)
 224 {
 225         unsigned long long __dummy;
 226
 227         /* Set FD flag in SR */
 228         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
 229                              "or        %0, %1, %0\n\t"
 230                              "putcon    %0, " __SR "\n\t"
 231                              : "=&r" (__dummy)
 232                              : "r" (SR_FD));
 233 }
 234
 235 static inline void enable_fpu(void)
 236 {
 237         unsigned long long __dummy;
 238
 239         /* Clear out FD flag in SR */
 240         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
 241                              "and       %0, %1, %0\n\t"
 242                              "putcon    %0, " __SR "\n\t"
 243                              : "=&r" (__dummy)
 244                              : "r" (~SR_FD));
 245 }
 246
 247 /* Round to nearest, no exceptions on inexact, overflow, underflow,
 248    zero-divide, invalid.  Configure option for whether to flush denorms to
 249    zero, or except if a denorm is encountered.  */
 250 #if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
 251 #define FPSCR_INIT  0x00040000
 252 #else
 253 #define FPSCR_INIT  0x00000000
 254 #endif
 255
 256 #ifdef CONFIG_SH_FPU
 257 /* Initialise the FP state of a task */
 258 void fpinit(struct sh_fpu_hard_struct *fpregs);
 259 #else
 260 #define fpinit(fpregs)  do { } while (0)
 261 #endif
 262
 263 extern struct task_struct *last_task_used_math;
 264
 265 /*
 266  * Return saved PC of a blocked thread.
 267  */
 268 #define thread_saved_pc(tsk)    (tsk->thread.pc)
 269
 270 extern unsigned long get_wchan(struct task_struct *p);
 271
 272 #define KSTK_EIP(tsk)  ((tsk)->thread.pc)
 273 #define KSTK_ESP(tsk)  ((tsk)->thread.sp)
 274
 275 #define cpu_relax()     barrier()
 276
 277 #endif  /* __ASSEMBLY__ */
 278 #endif /* __ASM_SH_PROCESSOR_64_H */