dec/prom/init.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * init.c: PROM library initialisation code.
0004  *
0005  * Copyright (C) 1998 Harald Koerfgen
0006  * Copyright (C) 2002, 2004  Maciej W. Rozycki
0007  */
0008 #include <linux/init.h>
0009 #include <linux/kernel.h>
0010 #include <linux/linkage.h>
0011 #include <linux/smp.h>
0012 #include <linux/string.h>
0013 #include <linux/types.h>
0014
0015 #include <asm/bootinfo.h>
0016 #include <asm/cpu.h>
0017 #include <asm/cpu-type.h>
0018 #include <asm/processor.h>
0019
0020 #include <asm/dec/prom.h>
0021
0022
0023 int (*__rex_bootinit)(void);
0024 int (*__rex_bootread)(void);
0025 int (*__rex_getbitmap)(memmap *);
0026 unsigned long *(*__rex_slot_address)(int);
0027 void *(*__rex_gettcinfo)(void);
0028 int (*__rex_getsysid)(void);
0029 void (*__rex_clear_cache)(void);
0030
0031 int (*__prom_getchar)(void);
0032 char *(*__prom_getenv)(char *);
0033 int (*__prom_printf)(char *, ...);
0034
0035 int (*__pmax_open)(char*, int);
0036 int (*__pmax_lseek)(int, long, int);
0037 int (*__pmax_read)(int, void *, int);
0038 int (*__pmax_close)(int);
0039
0040
0041 /*
0042  * Detect which PROM the DECSTATION has, and set the callback vectors
0043  * appropriately.
0044  */
0045 void __init which_prom(s32 magic, s32 *prom_vec)
0046 {
0047     /*
0048      * No sign of the REX PROM's magic number means we assume a non-REX
0049      * machine (i.e. we're on a DS2100/3100, DS5100 or DS5000/2xx)
0050      */
0051     if (prom_is_rex(magic)) {
0052         /*
0053          * Set up prom abstraction structure with REX entry points.
0054          */
0055         __rex_bootinit =
0056             (void *)(long)*(prom_vec + REX_PROM_BOOTINIT);
0057         __rex_bootread =
0058             (void *)(long)*(prom_vec + REX_PROM_BOOTREAD);
0059         __rex_getbitmap =
0060             (void *)(long)*(prom_vec + REX_PROM_GETBITMAP);
0061         __prom_getchar =
0062             (void *)(long)*(prom_vec + REX_PROM_GETCHAR);
0063         __prom_getenv =
0064             (void *)(long)*(prom_vec + REX_PROM_GETENV);
0065         __rex_getsysid =
0066             (void *)(long)*(prom_vec + REX_PROM_GETSYSID);
0067         __rex_gettcinfo =
0068             (void *)(long)*(prom_vec + REX_PROM_GETTCINFO);
0069         __prom_printf =
0070             (void *)(long)*(prom_vec + REX_PROM_PRINTF);
0071         __rex_slot_address =
0072             (void *)(long)*(prom_vec + REX_PROM_SLOTADDR);
0073         __rex_clear_cache =
0074             (void *)(long)*(prom_vec + REX_PROM_CLEARCACHE);
0075     } else {
0076         /*
0077          * Set up prom abstraction structure with non-REX entry points.
0078          */
0079         __prom_getchar = (void *)PMAX_PROM_GETCHAR;
0080         __prom_getenv = (void *)PMAX_PROM_GETENV;
0081         __prom_printf = (void *)PMAX_PROM_PRINTF;
0082         __pmax_open = (void *)PMAX_PROM_OPEN;
0083         __pmax_lseek = (void *)PMAX_PROM_LSEEK;
0084         __pmax_read = (void *)PMAX_PROM_READ;
0085         __pmax_close = (void *)PMAX_PROM_CLOSE;
0086     }
0087 }
0088
0089 void __init prom_init(void)
0090 {
0091     extern void dec_machine_halt(void);
0092     static const char cpu_msg[] __initconst =
0093         "Sorry, this kernel is compiled for a wrong CPU type!\n";
0094     s32 argc = fw_arg0;
0095     s32 *argv = (void *)fw_arg1;
0096     u32 magic = fw_arg2;
0097     s32 *prom_vec = (void *)fw_arg3;
0098
0099     /*
0100      * Determine which PROM we have
0101      * (and therefore which machine we're on!)
0102      */
0103     which_prom(magic, prom_vec);
0104
0105     if (prom_is_rex(magic))
0106         rex_clear_cache();
0107
0108     /* Register the early console.  */
0109     register_prom_console();
0110
0111     /* Were we compiled with the right CPU option? */
0112 #if defined(CONFIG_CPU_R3000)
0113     if ((current_cpu_type() == CPU_R4000SC) ||
0114         (current_cpu_type() == CPU_R4400SC)) {
0115         static const char r4k_msg[] __initconst =
0116             "Please recompile with \"CONFIG_CPU_R4X00 = y\".\n";
0117         printk(cpu_msg);
0118         printk(r4k_msg);
0119         dec_machine_halt();
0120     }
0121 #endif
0122
0123 #if defined(CONFIG_CPU_R4X00)
0124     if ((current_cpu_type() == CPU_R3000) ||
0125         (current_cpu_type() == CPU_R3000A)) {
0126         static const char r3k_msg[] __initconst =
0127             "Please recompile with \"CONFIG_CPU_R3000 = y\".\n";
0128         printk(cpu_msg);
0129         printk(r3k_msg);
0130         dec_machine_halt();
0131     }
0132 #endif
0133
0134     prom_meminit(magic);
0135     prom_identify_arch(magic);
0136     prom_init_cmdline(argc, argv, magic);
0137 }