arch/m68k/boot/atari/bootstrap.h

/* */
This source file includes following definitions.
fpu_idle_frame_size
change_stack
disable_interrupts
disable_cache
disable_mmu
jump_to_mover
   1 /*
   2 ** bootstrap.h -- This file is a part of the Atari bootloader.
   3 **
   4 ** Copyright 1993 by Arjan Knor
   5 **
   6 ** Modified by Andreas Schwab
   7 ** - clear transparent translation registers
   8 **
   9 ** This file is subject to the terms and conditions of the GNU General Public
  10 ** License.  See the file README.legal in the main directory of this archive
  11 ** for more details.
  12 **
  13 */
  14 
  15 #ifndef BOOTSTRAP_H
  16 #define BOOTSTRAP_H
  17 
  18 /* _MCH cookie values */
  19 #define MACH_ST  0
  20 #define MACH_STE 1
  21 #define MACH_TT  2
  22 #define MACH_FALCON 3
  23 
  24 /* some constants for memory handling */
  25 #define ST_RAM 0
  26 #define TT_RAM 1
  27 #define TT_RAM_BASE  (u_long)(0x01000000)
  28 #define MB           (1024 * 1024)
  29 #define START_MEM    (bi.memory[0].addr)
  30 #define MEM_SIZE     (bi.memory[0].size)
  31 
  32 /* the various CPU- and FPU-types */
  33 #define AFF_68000 (1)
  34 #define AFF_68020 (2)
  35 #define AFF_68030 (4)
  36 #define AFF_68040 (8)
  37 #define AFF_68881 (16)
  38 #define AFF_68882 (32)
  39 
  40 /* the possible OS-languages */
  41 #define USA 0
  42 #define FRG 1
  43 #define FRA 2
  44 #define UK  3
  45 #define SPA 4
  46 #define ITA 5
  47 #define SWE 6
  48 #define SWF 7
  49 #define SWG 8
  50 #define TUR 9
  51 #define FIN 10
  52 #define NOR 11
  53 #define DEN 12
  54 #define SAU 13
  55 #define HOL 14
  56 
  57 /* some inline functions */
  58 
  59 static __inline int fpu_idle_frame_size (void)
     /*  */
  60 {
  61   char fpu_frame[216];
  62   __asm__ __volatile__ ("fnop"::);
  63   __asm__ __volatile__ ("fsave %0@" : : "a" (fpu_frame));
  64   return fpu_frame[1];
  65 }
  66 
  67 static __inline void change_stack (u_long *stackp)
     /*  */
  68 {
  69     __asm__ volatile ("movel %0,sp\n\t" :: "g" (stackp) : "sp");
  70 }
  71 
  72 static __inline void disable_interrupts (void)
     /*  */
  73 {
  74   __asm__ volatile ("orw #0x700,sr":);
  75 }
  76 
  77 extern struct bootinfo bi;
  78 static __inline void disable_cache (void)
     /*  */
  79 {
  80     __asm__ volatile ("movec %0,cacr" :: "d" (0));
  81     if (bi.cputype & CPU_68060) {
  82         /* '060: clear branch cache after disabling it;
  83          * disable superscalar operation (and enable FPU) */
  84         __asm__ volatile ("movec %0,cacr" :: "d" (0x00400000));
  85         __asm__ volatile ("moveq #0,d0;"
  86                           ".long 0x4e7b0808"    /* movec d0,pcr */
  87                           : /* no outputs */
  88                           : /* no inputs */
  89                           : "d0");
  90     }
  91 }
  92 
  93 static __inline void disable_mmu (void)
     /*  */
  94 {
  95         if (bi.cputype & (CPU_68040|CPU_68060)) {
  96             __asm__ volatile ("moveq #0,d0;"
  97                                                   ".long 0x4e7b0003;"   /* movec d0,tc */
  98                                                   ".long 0x4e7b0004;"   /* movec d0,itt0 */
  99                                                   ".long 0x4e7b0005;"   /* movec d0,itt1 */
 100                                                   ".long 0x4e7b0006;"   /* movec d0,dtt0 */
 101                                                   ".long 0x4e7b0007"    /* movec d0,dtt1 */
 102                                                   : /* no outputs */
 103                                                   : /* no inputs */
 104                                                   : "d0");
 105         }
 106         else {
 107                 __asm__ volatile ("subl  #4,sp\n\t"
 108                                                   "pmove tc,sp@\n\t"
 109                                                   "bclr  #7,sp@\n\t"
 110                                                   "pmove sp@,tc\n\t"
 111                                                   "addl  #4,sp");
 112                 if (bi.cputype & CPU_68030) {
 113                         __asm__ volatile ("clrl sp@-\n\t"
 114                                                           ".long 0xf0170800\n\t" /* pmove sp@,tt0 */
 115                                                           ".long 0xf0170c00\n\t" /* pmove sp@,tt1 */
 116                                                           "addl  #4,sp\n");
 117                 }
 118         }
 119 }
 120 
 121 static __inline void jump_to_mover (void *, void *, void *, void *, int, int,
 122                                     void *) __attribute__ ((noreturn));
 123 static __inline void jump_to_mover (void *kernel_start, void *mem_start,
     /*  */
 124                                     void *ramdisk_end, void *mem_end,
 125                                     int kernel_size, int ramdisk_size,
 126                                     void *mover_addr)
 127 {
 128     asm volatile ("movel %0,a0\n\t"
 129                   "movel %1,a1\n\t"
 130                   "movel %2,a2\n\t"
 131                   "movel %3,a3\n\t"
 132                   "movel %4,d0\n\t"
 133                   "movel %5,d1\n\t"
 134                   "jmp   %6@\n"
 135                   : /* no outputs */
 136                   : "g" (kernel_start), "g" (mem_start),
 137                     "g" (ramdisk_end), "g" (mem_end),
 138                     "g" (kernel_size), "g" (ramdisk_size),
 139                     "a" (mover_addr)
 140                   : "a0", "a1", "a2", "a3", "d0", "d1");
 141 
 142         /* Avoid warning that function may return */
 143         for (;;) ;
 144 }
 145 
 146 #endif /* BOOTSTRAP_H */
 147
/* */
root/arch/m68k/boot/atari/bootstrap.h

INCLUDED FROM

DEFINITIONS
