arch/mips/include/asm/dec/prom.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  *      include/asm-mips/dec/prom.h
   4  *
   5  *      DECstation PROM interface.
   6  *
   7  *      Copyright (C) 2002  Maciej W. Rozycki
   8  *
   9  *      Based on arch/mips/dec/prom/prom.h by the Anonymous.
  10  */
  11 #ifndef _ASM_DEC_PROM_H
  12 #define _ASM_DEC_PROM_H
  13
  14 #include <linux/types.h>
  15
  16 #include <asm/addrspace.h>
  17
  18 /*
  19  * PMAX/3MAX PROM entry points for DS2100/3100's and DS5000/2xx's.
  20  * Many of these will work for MIPSen as well!
  21  */
  22 #define VEC_RESET               (u64 *)CKSEG1ADDR(0x1fc00000)
  23                                                         /* Prom base address */
  24
  25 #define PMAX_PROM_ENTRY(x)      (VEC_RESET + (x))       /* Prom jump table */
  26
  27 #define PMAX_PROM_HALT          PMAX_PROM_ENTRY(2)      /* valid on MIPSen */
  28 #define PMAX_PROM_AUTOBOOT      PMAX_PROM_ENTRY(5)      /* valid on MIPSen */
  29 #define PMAX_PROM_OPEN          PMAX_PROM_ENTRY(6)
  30 #define PMAX_PROM_READ          PMAX_PROM_ENTRY(7)
  31 #define PMAX_PROM_CLOSE         PMAX_PROM_ENTRY(10)
  32 #define PMAX_PROM_LSEEK         PMAX_PROM_ENTRY(11)
  33 #define PMAX_PROM_GETCHAR       PMAX_PROM_ENTRY(12)
  34 #define PMAX_PROM_PUTCHAR       PMAX_PROM_ENTRY(13)     /* 12 on MIPSen */
  35 #define PMAX_PROM_GETS          PMAX_PROM_ENTRY(15)
  36 #define PMAX_PROM_PRINTF        PMAX_PROM_ENTRY(17)
  37 #define PMAX_PROM_GETENV        PMAX_PROM_ENTRY(33)     /* valid on MIPSen */
  38
  39
  40 /*
  41  * Magic number indicating REX PROM available on DECstation.  Found in
  42  * register a2 on transfer of control to program from PROM.
  43  */
  44 #define REX_PROM_MAGIC          0x30464354
  45
  46 /* KN04 and KN05 are REX PROMs, so only do the check for R3k systems.  */
  47 static inline bool prom_is_rex(u32 magic)
  48 {
  49         return !IS_ENABLED(CONFIG_CPU_R3000) || magic == REX_PROM_MAGIC;
  50 }
  51
  52 /*
  53  * 3MIN/MAXINE PROM entry points for DS5000/1xx's, DS5000/xx's and
  54  * DS5000/2x0.
  55  */
  56 #define REX_PROM_GETBITMAP      0x84/4  /* get mem bitmap */
  57 #define REX_PROM_GETCHAR        0x24/4  /* getch() */
  58 #define REX_PROM_GETENV         0x64/4  /* get env. variable */
  59 #define REX_PROM_GETSYSID       0x80/4  /* get system id */
  60 #define REX_PROM_GETTCINFO      0xa4/4
  61 #define REX_PROM_PRINTF         0x30/4  /* printf() */
  62 #define REX_PROM_SLOTADDR       0x6c/4  /* slotaddr */
  63 #define REX_PROM_BOOTINIT       0x54/4  /* open() */
  64 #define REX_PROM_BOOTREAD       0x58/4  /* read() */
  65 #define REX_PROM_CLEARCACHE     0x7c/4
  66
  67
  68 /*
  69  * Used by rex_getbitmap().
  70  */
  71 typedef struct {
  72         int pagesize;
  73         unsigned char bitmap[];
  74 } memmap;
  75
  76
  77 /*
  78  * Function pointers as read from a PROM's callback vector.
  79  */
  80 extern int (*__rex_bootinit)(void);
  81 extern int (*__rex_bootread)(void);
  82 extern int (*__rex_getbitmap)(memmap *);
  83 extern unsigned long *(*__rex_slot_address)(int);
  84 extern void *(*__rex_gettcinfo)(void);
  85 extern int (*__rex_getsysid)(void);
  86 extern void (*__rex_clear_cache)(void);
  87
  88 extern int (*__prom_getchar)(void);
  89 extern char *(*__prom_getenv)(char *);
  90 extern int (*__prom_printf)(char *, ...);
  91
  92 extern int (*__pmax_open)(char*, int);
  93 extern int (*__pmax_lseek)(int, long, int);
  94 extern int (*__pmax_read)(int, void *, int);
  95 extern int (*__pmax_close)(int);
  96
  97
  98 #ifdef CONFIG_64BIT
  99
 100 /*
 101  * On MIPS64 we have to call PROM functions via a helper
 102  * dispatcher to accommodate ABI incompatibilities.
 103  */
 104 #define __DEC_PROM_O32(fun, arg) fun arg __asm__(#fun); \
 105                                  __asm__(#fun " = call_o32")
 106
 107 int __DEC_PROM_O32(_rex_bootinit, (int (*)(void), void *));
 108 int __DEC_PROM_O32(_rex_bootread, (int (*)(void), void *));
 109 int __DEC_PROM_O32(_rex_getbitmap, (int (*)(memmap *), void *, memmap *));
 110 unsigned long *__DEC_PROM_O32(_rex_slot_address,
 111                              (unsigned long *(*)(int), void *, int));
 112 void *__DEC_PROM_O32(_rex_gettcinfo, (void *(*)(void), void *));
 113 int __DEC_PROM_O32(_rex_getsysid, (int (*)(void), void *));
 114 void __DEC_PROM_O32(_rex_clear_cache, (void (*)(void), void *));
 115
 116 int __DEC_PROM_O32(_prom_getchar, (int (*)(void), void *));
 117 char *__DEC_PROM_O32(_prom_getenv, (char *(*)(char *), void *, char *));
 118 int __DEC_PROM_O32(_prom_printf, (int (*)(char *, ...), void *, char *, ...));
 119
 120
 121 #define rex_bootinit()          _rex_bootinit(__rex_bootinit, NULL)
 122 #define rex_bootread()          _rex_bootread(__rex_bootread, NULL)
 123 #define rex_getbitmap(x)        _rex_getbitmap(__rex_getbitmap, NULL, x)
 124 #define rex_slot_address(x)     _rex_slot_address(__rex_slot_address, NULL, x)
 125 #define rex_gettcinfo()         _rex_gettcinfo(__rex_gettcinfo, NULL)
 126 #define rex_getsysid()          _rex_getsysid(__rex_getsysid, NULL)
 127 #define rex_clear_cache()       _rex_clear_cache(__rex_clear_cache, NULL)
 128
 129 #define prom_getchar()          _prom_getchar(__prom_getchar, NULL)
 130 #define prom_getenv(x)          _prom_getenv(__prom_getenv, NULL, x)
 131 #define prom_printf(x...)       _prom_printf(__prom_printf, NULL, x)
 132
 133 #else /* !CONFIG_64BIT */
 134
 135 /*
 136  * On plain MIPS we just call PROM functions directly.
 137  */
 138 #define rex_bootinit            __rex_bootinit
 139 #define rex_bootread            __rex_bootread
 140 #define rex_getbitmap           __rex_getbitmap
 141 #define rex_slot_address        __rex_slot_address
 142 #define rex_gettcinfo           __rex_gettcinfo
 143 #define rex_getsysid            __rex_getsysid
 144 #define rex_clear_cache         __rex_clear_cache
 145
 146 #define prom_getchar            __prom_getchar
 147 #define prom_getenv             __prom_getenv
 148 #define prom_printf             __prom_printf
 149
 150 #define pmax_open               __pmax_open
 151 #define pmax_lseek              __pmax_lseek
 152 #define pmax_read               __pmax_read
 153 #define pmax_close              __pmax_close
 154
 155 #endif /* !CONFIG_64BIT */
 156
 157
 158 extern void prom_meminit(u32);
 159 extern void prom_identify_arch(u32);
 160 extern void prom_init_cmdline(s32, s32 *, u32);
 161
 162 extern void register_prom_console(void);
 163
 164 #endif /* _ASM_DEC_PROM_H */