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 extern void unregister_prom_console(void);
164
165 #endif /* _ASM_DEC_PROM_H */
166
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