asm/dec/prom.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  *  include/asm-mips/dec/prom.h
0004  *
0005  *  DECstation PROM interface.
0006  *
0007  *  Copyright (C) 2002  Maciej W. Rozycki
0008  *
0009  *  Based on arch/mips/dec/prom/prom.h by the Anonymous.
0010  */
0011 #ifndef _ASM_DEC_PROM_H
0012 #define _ASM_DEC_PROM_H
0013
0014 #include <linux/types.h>
0015
0016 #include <asm/addrspace.h>
0017
0018 /*
0019  * PMAX/3MAX PROM entry points for DS2100/3100's and DS5000/2xx's.
0020  * Many of these will work for MIPSen as well!
0021  */
0022 #define VEC_RESET       (u64 *)CKSEG1ADDR(0x1fc00000)
0023                             /* Prom base address */
0024
0025 #define PMAX_PROM_ENTRY(x)  (VEC_RESET + (x))   /* Prom jump table */
0026
0027 #define PMAX_PROM_HALT      PMAX_PROM_ENTRY(2)  /* valid on MIPSen */
0028 #define PMAX_PROM_AUTOBOOT  PMAX_PROM_ENTRY(5)  /* valid on MIPSen */
0029 #define PMAX_PROM_OPEN      PMAX_PROM_ENTRY(6)
0030 #define PMAX_PROM_READ      PMAX_PROM_ENTRY(7)
0031 #define PMAX_PROM_CLOSE     PMAX_PROM_ENTRY(10)
0032 #define PMAX_PROM_LSEEK     PMAX_PROM_ENTRY(11)
0033 #define PMAX_PROM_GETCHAR   PMAX_PROM_ENTRY(12)
0034 #define PMAX_PROM_PUTCHAR   PMAX_PROM_ENTRY(13) /* 12 on MIPSen */
0035 #define PMAX_PROM_GETS      PMAX_PROM_ENTRY(15)
0036 #define PMAX_PROM_PRINTF    PMAX_PROM_ENTRY(17)
0037 #define PMAX_PROM_GETENV    PMAX_PROM_ENTRY(33) /* valid on MIPSen */
0038
0039
0040 /*
0041  * Magic number indicating REX PROM available on DECstation.  Found in
0042  * register a2 on transfer of control to program from PROM.
0043  */
0044 #define REX_PROM_MAGIC      0x30464354
0045
0046 /* KN04 and KN05 are REX PROMs, so only do the check for R3k systems.  */
0047 static inline bool prom_is_rex(u32 magic)
0048 {
0049     return !IS_ENABLED(CONFIG_CPU_R3000) || magic == REX_PROM_MAGIC;
0050 }
0051
0052 /*
0053  * 3MIN/MAXINE PROM entry points for DS5000/1xx's, DS5000/xx's and
0054  * DS5000/2x0.
0055  */
0056 #define REX_PROM_GETBITMAP  0x84/4  /* get mem bitmap */
0057 #define REX_PROM_GETCHAR    0x24/4  /* getch() */
0058 #define REX_PROM_GETENV     0x64/4  /* get env. variable */
0059 #define REX_PROM_GETSYSID   0x80/4  /* get system id */
0060 #define REX_PROM_GETTCINFO  0xa4/4
0061 #define REX_PROM_PRINTF     0x30/4  /* printf() */
0062 #define REX_PROM_SLOTADDR   0x6c/4  /* slotaddr */
0063 #define REX_PROM_BOOTINIT   0x54/4  /* open() */
0064 #define REX_PROM_BOOTREAD   0x58/4  /* read() */
0065 #define REX_PROM_CLEARCACHE 0x7c/4
0066
0067
0068 /*
0069  * Used by rex_getbitmap().
0070  */
0071 typedef struct {
0072     int pagesize;
0073     unsigned char bitmap[0];
0074 } memmap;
0075
0076
0077 /*
0078  * Function pointers as read from a PROM's callback vector.
0079  */
0080 extern int (*__rex_bootinit)(void);
0081 extern int (*__rex_bootread)(void);
0082 extern int (*__rex_getbitmap)(memmap *);
0083 extern unsigned long *(*__rex_slot_address)(int);
0084 extern void *(*__rex_gettcinfo)(void);
0085 extern int (*__rex_getsysid)(void);
0086 extern void (*__rex_clear_cache)(void);
0087
0088 extern int (*__prom_getchar)(void);
0089 extern char *(*__prom_getenv)(char *);
0090 extern int (*__prom_printf)(char *, ...);
0091
0092 extern int (*__pmax_open)(char*, int);
0093 extern int (*__pmax_lseek)(int, long, int);
0094 extern int (*__pmax_read)(int, void *, int);
0095 extern int (*__pmax_close)(int);
0096
0097
0098 #ifdef CONFIG_64BIT
0099
0100 /*
0101  * On MIPS64 we have to call PROM functions via a helper
0102  * dispatcher to accommodate ABI incompatibilities.
0103  */
0104 #define __DEC_PROM_O32(fun, arg) fun arg __asm__(#fun); \
0105                  __asm__(#fun " = call_o32")
0106
0107 int __DEC_PROM_O32(_rex_bootinit, (int (*)(void), void *));
0108 int __DEC_PROM_O32(_rex_bootread, (int (*)(void), void *));
0109 int __DEC_PROM_O32(_rex_getbitmap, (int (*)(memmap *), void *, memmap *));
0110 unsigned long *__DEC_PROM_O32(_rex_slot_address,
0111                  (unsigned long *(*)(int), void *, int));
0112 void *__DEC_PROM_O32(_rex_gettcinfo, (void *(*)(void), void *));
0113 int __DEC_PROM_O32(_rex_getsysid, (int (*)(void), void *));
0114 void __DEC_PROM_O32(_rex_clear_cache, (void (*)(void), void *));
0115
0116 int __DEC_PROM_O32(_prom_getchar, (int (*)(void), void *));
0117 char *__DEC_PROM_O32(_prom_getenv, (char *(*)(char *), void *, char *));
0118 int __DEC_PROM_O32(_prom_printf, (int (*)(char *, ...), void *, char *, ...));
0119
0120
0121 #define rex_bootinit()      _rex_bootinit(__rex_bootinit, NULL)
0122 #define rex_bootread()      _rex_bootread(__rex_bootread, NULL)
0123 #define rex_getbitmap(x)    _rex_getbitmap(__rex_getbitmap, NULL, x)
0124 #define rex_slot_address(x) _rex_slot_address(__rex_slot_address, NULL, x)
0125 #define rex_gettcinfo()     _rex_gettcinfo(__rex_gettcinfo, NULL)
0126 #define rex_getsysid()      _rex_getsysid(__rex_getsysid, NULL)
0127 #define rex_clear_cache()   _rex_clear_cache(__rex_clear_cache, NULL)
0128
0129 #define prom_getchar()      _prom_getchar(__prom_getchar, NULL)
0130 #define prom_getenv(x)      _prom_getenv(__prom_getenv, NULL, x)
0131 #define prom_printf(x...)   _prom_printf(__prom_printf, NULL, x)
0132
0133 #else /* !CONFIG_64BIT */
0134
0135 /*
0136  * On plain MIPS we just call PROM functions directly.
0137  */
0138 #define rex_bootinit        __rex_bootinit
0139 #define rex_bootread        __rex_bootread
0140 #define rex_getbitmap       __rex_getbitmap
0141 #define rex_slot_address    __rex_slot_address
0142 #define rex_gettcinfo       __rex_gettcinfo
0143 #define rex_getsysid        __rex_getsysid
0144 #define rex_clear_cache     __rex_clear_cache
0145
0146 #define prom_getchar        __prom_getchar
0147 #define prom_getenv     __prom_getenv
0148 #define prom_printf     __prom_printf
0149
0150 #define pmax_open       __pmax_open
0151 #define pmax_lseek      __pmax_lseek
0152 #define pmax_read       __pmax_read
0153 #define pmax_close      __pmax_close
0154
0155 #endif /* !CONFIG_64BIT */
0156
0157
0158 extern void prom_meminit(u32);
0159 extern void prom_identify_arch(u32);
0160 extern void prom_init_cmdline(s32, s32 *, u32);
0161
0162 extern void register_prom_console(void);
0163 extern void unregister_prom_console(void);
0164
0165 #endif /* _ASM_DEC_PROM_H */