include/asm-i386/processor.h

   1 /*
   2  * include/asm-i386/processor.h
   3  *
   4  * Copyright (C) 1994 Linus Torvalds
   5  */
   6
   7 #ifndef __ASM_I386_PROCESSOR_H
   8 #define __ASM_I386_PROCESSOR_H
   9
  10 #include <asm/vm86.h>
  11 #include <asm/math_emu.h>
  12 #include <asm/segment.h>
  13 #include <asm/page.h>
  14
  15 /*
  16  *  CPU type and hardware bug flags. Kept separately for each CPU.
  17  *  Members of this structure are referenced in head.S, so think twice
  18  *  before touching them. [mj]
  19  */
  20
  21 struct cpuinfo_x86 {
  22         __u8    x86;            /* CPU family */
  23         __u8    x86_vendor;     /* CPU vendor */
  24         __u8    x86_model;
  25         __u8    x86_mask;
  26         char    wp_works_ok;    /* It doesn't on 386's */
  27         char    hlt_works_ok;   /* Problems on some 486Dx4's and old 386's */
  28         char    hard_math;
  29         char    rfu;
  30         int     cpuid_level;    /* Maximum supported CPUID level, -1=no CPUID */
  31         __u32   x86_capability;
  32         char    x86_vendor_id[16];
  33         char    x86_model_id[64];
  34         int     fdiv_bug;
  35         int     f00f_bug;
  36         unsigned long loops_per_sec;
  37         unsigned long *pgd_quick;
  38         unsigned long *pte_quick;
  39         unsigned long pgtable_cache_sz;
  40 };
  41
  42 #define X86_VENDOR_INTEL 0
  43 #define X86_VENDOR_CYRIX 1
  44 #define X86_VENDOR_AMD 2
  45 #define X86_VENDOR_UMC 3
  46 #define X86_VENDOR_NEXGEN 4
  47 #define X86_VENDOR_CENTAUR 5
  48 #define X86_VENDOR_UNKNOWN 0xff
  49
  50 /*
  51  * capabilities of CPUs
  52  */
  53
  54 #define X86_FEATURE_FPU         0x00000001      /* onboard FPU */
  55 #define X86_FEATURE_VME         0x00000002      /* Virtual Mode Extensions */
  56 #define X86_FEATURE_DE          0x00000004      /* Debugging Extensions */
  57 #define X86_FEATURE_PSE         0x00000008      /* Page Size Extensions */
  58 #define X86_FEATURE_TSC         0x00000010      /* Time Stamp Counter */
  59 #define X86_FEATURE_MSR         0x00000020      /* Model-Specific Registers, RDMSR, WRMSR */
  60 #define X86_FEATURE_PAE         0x00000040      /* Physical Address Extensions */
  61 #define X86_FEATURE_MCE         0x00000080      /* Machine Check Exceptions */
  62 #define X86_FEATURE_CX8         0x00000100      /* CMPXCHG8 instruction */
  63 #define X86_FEATURE_APIC        0x00000200      /* onboard APIC */
  64 #define X86_FEATURE_10          0x00000400
  65 #define X86_FEATURE_SEP         0x00000800      /* Fast System Call */
  66 #define X86_FEATURE_MTRR        0x00001000      /* Memory Type Range Registers */
  67 #define X86_FEATURE_PGE         0x00002000      /* Page Global Enable */
  68 #define X86_FEATURE_MCA         0x00004000      /* Machine Check Architecture */
  69 #define X86_FEATURE_CMOV        0x00008000      /* CMOV instruction (FCMOVCC and FCOMI too if FPU present) */
  70 #define X86_FEATURE_PAT 0x00010000      /* Page Attribute Table */
  71 #define X86_FEATURE_PSE36       0x00020000      /* 36-bit PSEs */
  72 #define X86_FEATURE_18          0x00040000
  73 #define X86_FEATURE_19          0x00080000
  74 #define X86_FEATURE_20          0x00100000
  75 #define X86_FEATURE_21          0x00200000
  76 #define X86_FEATURE_22          0x00400000
  77 #define X86_FEATURE_MMX         0x00800000      /* multimedia extensions */
  78 #define X86_FEATURE_FXSR        0x01000000      /* FXSAVE and FXRSTOR instructions (fast save and restore of FPU context), and CR4.OSFXSR (OS uses these instructions) available */
  79 #define X86_FEATURE_25          0x02000000
  80 #define X86_FEATURE_26          0x04000000
  81 #define X86_FEATURE_27          0x08000000
  82 #define X86_FEATURE_28          0x10000000
  83 #define X86_FEATURE_29          0x20000000
  84 #define X86_FEATURE_30          0x40000000
  85 #define X86_FEATURE_AMD3D       0x80000000
  86
  87 extern struct cpuinfo_x86 boot_cpu_data;
  88
  89 #ifdef __SMP__
  90 extern struct cpuinfo_x86 cpu_data[];
  91 #define current_cpu_data cpu_data[smp_processor_id()]
  92 #else
  93 #define cpu_data &boot_cpu_data
  94 #define current_cpu_data boot_cpu_data
  95 #endif
  96
  97 extern char ignore_irq13;
  98
  99 extern void identify_cpu(struct cpuinfo_x86 *);
 100 extern void print_cpu_info(struct cpuinfo_x86 *);
 101
 102 /*
 103  *      Generic CPUID function
 104  */
 105 extern inline void cpuid(int op, int *eax, int *ebx, int *ecx, int *edx)
 106 {
 107         __asm__("cpuid"
 108                 : "=a" (*eax),
 109                   "=b" (*ebx),
 110                   "=c" (*ecx),
 111                   "=d" (*edx)
 112                 : "a" (op)
 113                 : "cc");
 114 }
 115
 116 /*
 117  *      Cyrix CPU configuration register indexes
 118  */
 119 #define CX86_CCR2 0xc2
 120 #define CX86_CCR3 0xc3
 121 #define CX86_CCR4 0xe8
 122 #define CX86_CCR5 0xe9
 123 #define CX86_DIR0 0xfe
 124 #define CX86_DIR1 0xff
 125
 126 /*
 127  *      Cyrix CPU indexed register access macros
 128  */
 129
 130 #define getCx86(reg) ({ outb((reg), 0x22); inb(0x23); })
 131
 132 #define setCx86(reg, data) do { \
 133         outb((reg), 0x22); \
 134         outb((data), 0x23); \
 135 } while (0)
 136
 137 /*
 138  * Bus types (default is ISA, but people can check others with these..)
 139  */
 140 extern int EISA_bus;
 141 extern int MCA_bus;
 142
 143 /* from system description table in BIOS.  Mostly for MCA use, but
 144 others may find it useful. */
 145 extern unsigned int machine_id;
 146 extern unsigned int machine_submodel_id;
 147 extern unsigned int BIOS_revision;
 148
 149 /*
 150  * User space process size: 3GB (default).
 151  */
 152 #define TASK_SIZE       (PAGE_OFFSET)
 153
 154 /* This decides where the kernel will search for a free chunk of vm
 155  * space during mmap's.
 156  */
 157 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 3)
 158
 159 /*
 160  * Size of io_bitmap in longwords: 32 is ports 0-0x3ff.
 161  */
 162 #define IO_BITMAP_SIZE  32
 163
 164 struct i387_hard_struct {
 165         long    cwd;
 166         long    swd;
 167         long    twd;
 168         long    fip;
 169         long    fcs;
 170         long    foo;
 171         long    fos;
 172         long    st_space[20];   /* 8*10 bytes for each FP-reg = 80 bytes */
 173         long    status;         /* software status information */
 174 };
 175
 176 struct i387_soft_struct {
 177         long    cwd;
 178         long    swd;
 179         long    twd;
 180         long    fip;
 181         long    fcs;
 182         long    foo;
 183         long    fos;
 184         long    st_space[20];   /* 8*10 bytes for each FP-reg = 80 bytes */
 185         unsigned char   ftop, changed, lookahead, no_update, rm, alimit;
 186         struct info     *info;
 187         unsigned long   entry_eip;
 188 };
 189
 190 union i387_union {
 191         struct i387_hard_struct hard;
 192         struct i387_soft_struct soft;
 193 };
 194
 195 typedef struct {
 196         unsigned long seg;
 197 } mm_segment_t;
 198
 199 struct thread_struct {
 200         unsigned short  back_link,__blh;
 201         unsigned long   esp0;
 202         unsigned short  ss0,__ss0h;
 203         unsigned long   esp1;
 204         unsigned short  ss1,__ss1h;
 205         unsigned long   esp2;
 206         unsigned short  ss2,__ss2h;
 207         unsigned long   cr3;
 208         unsigned long   eip;
 209         unsigned long   eflags;
 210         unsigned long   eax,ecx,edx,ebx;
 211         unsigned long   esp;
 212         unsigned long   ebp;
 213         unsigned long   esi;
 214         unsigned long   edi;
 215         unsigned short  es, __esh;
 216         unsigned short  cs, __csh;
 217         unsigned short  ss, __ssh;
 218         unsigned short  ds, __dsh;
 219         unsigned short  fs, __fsh;
 220         unsigned short  gs, __gsh;
 221         unsigned short  ldt, __ldth;
 222         unsigned short  trace, bitmap;
 223         unsigned long   io_bitmap[IO_BITMAP_SIZE+1];
 224         unsigned long   tr;
 225         unsigned long   cr2, trap_no, error_code;
 226         mm_segment_t    segment;
 227 /* debug registers */
 228         long debugreg[8];  /* Hardware debugging registers */
 229 /* floating point info */
 230         union i387_union i387;
 231 /* virtual 86 mode info */
 232         struct vm86_struct * vm86_info;
 233         unsigned long screen_bitmap;
 234         unsigned long v86flags, v86mask, v86mode, saved_esp0;
 235 };
 236
 237 #define INIT_MMAP \
 238 { &init_mm, 0, 0, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, NULL, &init_mm.mmap }
 239
 240 #define INIT_TSS  {                                             \
 241         0,0, /* back_link, __blh */                             \
 242         sizeof(init_stack) + (long) &init_stack, /* esp0 */     \
 243         __KERNEL_DS, 0, /* ss0 */                               \
 244         0,0,0,0,0,0, /* stack1, stack2 */                       \
 245         (long) &swapper_pg_dir - PAGE_OFFSET, /* cr3 */         \
 246         0,0, /* eip,eflags */                                   \
 247         0,0,0,0, /* eax,ecx,edx,ebx */                          \
 248         0,0,0,0, /* esp,ebp,esi,edi */                          \
 249         0,0,0,0,0,0, /* es,cs,ss */                             \
 250         0,0,0,0,0,0, /* ds,fs,gs */                             \
 251         _LDT(0),0, /* ldt */                                    \
 252         0, 0x8000, /* tace, bitmap */                           \
 253         {~0, }, /* ioperm */                                    \
 254         _TSS(0), 0, 0, 0, (mm_segment_t) { 0 }, /* obsolete */  \
 255         { 0, },                                                 \
 256         { { 0, }, },  /* 387 state */                           \
 257         NULL, 0, 0, 0, 0, 0, /* vm86_info */                    \
 258 }
 259
 260 #define start_thread(regs, new_eip, new_esp) do {               \
 261         __asm__("movl %w0,%%fs ; movl %w0,%%gs": :"r" (0));     \
 262         set_fs(USER_DS);                                        \
 263         regs->xds = __USER_DS;                                  \
 264         regs->xes = __USER_DS;                                  \
 265         regs->xss = __USER_DS;                                  \
 266         regs->xcs = __USER_CS;                                  \
 267         regs->eip = new_eip;                                    \
 268         regs->esp = new_esp;                                    \
 269 } while (0)
 270
 271 /* Forward declaration, a strange C thing */
 272 struct mm_struct;
 273
 274 /* Free all resources held by a thread. */
 275 extern void release_thread(struct task_struct *);
 276
 277 /* Copy and release all segment info associated with a VM */
 278 extern void copy_segments(int nr, struct task_struct *p, struct mm_struct * mm);
 279 extern void release_segments(struct mm_struct * mm);
 280
 281 /*
 282  * Return saved PC of a blocked thread.
 283  */
 284 extern inline unsigned long thread_saved_pc(struct thread_struct *t)
 285 {
 286         return ((unsigned long *)t->esp)[3];
 287 }
 288
 289 extern struct task_struct * alloc_task_struct(void);
 290 extern void free_task_struct(struct task_struct *);
 291
 292 #define init_task       (init_task_union.task)
 293 #define init_stack      (init_task_union.stack)
 294
 295 #endif /* __ASM_I386_PROCESSOR_H */