cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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init.c (3616B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * init.c: PROM library initialisation code.
      4 *
      5 * Copyright (C) 1998 Harald Koerfgen
      6 * Copyright (C) 2002, 2004  Maciej W. Rozycki
      7 */
      8#include <linux/init.h>
      9#include <linux/kernel.h>
     10#include <linux/linkage.h>
     11#include <linux/smp.h>
     12#include <linux/string.h>
     13#include <linux/types.h>
     14
     15#include <asm/bootinfo.h>
     16#include <asm/cpu.h>
     17#include <asm/cpu-type.h>
     18#include <asm/processor.h>
     19
     20#include <asm/dec/prom.h>
     21
     22
     23int (*__rex_bootinit)(void);
     24int (*__rex_bootread)(void);
     25int (*__rex_getbitmap)(memmap *);
     26unsigned long *(*__rex_slot_address)(int);
     27void *(*__rex_gettcinfo)(void);
     28int (*__rex_getsysid)(void);
     29void (*__rex_clear_cache)(void);
     30
     31int (*__prom_getchar)(void);
     32char *(*__prom_getenv)(char *);
     33int (*__prom_printf)(char *, ...);
     34
     35int (*__pmax_open)(char*, int);
     36int (*__pmax_lseek)(int, long, int);
     37int (*__pmax_read)(int, void *, int);
     38int (*__pmax_close)(int);
     39
     40
     41/*
     42 * Detect which PROM the DECSTATION has, and set the callback vectors
     43 * appropriately.
     44 */
     45void __init which_prom(s32 magic, s32 *prom_vec)
     46{
     47	/*
     48	 * No sign of the REX PROM's magic number means we assume a non-REX
     49	 * machine (i.e. we're on a DS2100/3100, DS5100 or DS5000/2xx)
     50	 */
     51	if (prom_is_rex(magic)) {
     52		/*
     53		 * Set up prom abstraction structure with REX entry points.
     54		 */
     55		__rex_bootinit =
     56			(void *)(long)*(prom_vec + REX_PROM_BOOTINIT);
     57		__rex_bootread =
     58			(void *)(long)*(prom_vec + REX_PROM_BOOTREAD);
     59		__rex_getbitmap =
     60			(void *)(long)*(prom_vec + REX_PROM_GETBITMAP);
     61		__prom_getchar =
     62			(void *)(long)*(prom_vec + REX_PROM_GETCHAR);
     63		__prom_getenv =
     64			(void *)(long)*(prom_vec + REX_PROM_GETENV);
     65		__rex_getsysid =
     66			(void *)(long)*(prom_vec + REX_PROM_GETSYSID);
     67		__rex_gettcinfo =
     68			(void *)(long)*(prom_vec + REX_PROM_GETTCINFO);
     69		__prom_printf =
     70			(void *)(long)*(prom_vec + REX_PROM_PRINTF);
     71		__rex_slot_address =
     72			(void *)(long)*(prom_vec + REX_PROM_SLOTADDR);
     73		__rex_clear_cache =
     74			(void *)(long)*(prom_vec + REX_PROM_CLEARCACHE);
     75	} else {
     76		/*
     77		 * Set up prom abstraction structure with non-REX entry points.
     78		 */
     79		__prom_getchar = (void *)PMAX_PROM_GETCHAR;
     80		__prom_getenv = (void *)PMAX_PROM_GETENV;
     81		__prom_printf = (void *)PMAX_PROM_PRINTF;
     82		__pmax_open = (void *)PMAX_PROM_OPEN;
     83		__pmax_lseek = (void *)PMAX_PROM_LSEEK;
     84		__pmax_read = (void *)PMAX_PROM_READ;
     85		__pmax_close = (void *)PMAX_PROM_CLOSE;
     86	}
     87}
     88
     89void __init prom_init(void)
     90{
     91	extern void dec_machine_halt(void);
     92	static const char cpu_msg[] __initconst =
     93		"Sorry, this kernel is compiled for a wrong CPU type!\n";
     94	s32 argc = fw_arg0;
     95	s32 *argv = (void *)fw_arg1;
     96	u32 magic = fw_arg2;
     97	s32 *prom_vec = (void *)fw_arg3;
     98
     99	/*
    100	 * Determine which PROM we have
    101	 * (and therefore which machine we're on!)
    102	 */
    103	which_prom(magic, prom_vec);
    104
    105	if (prom_is_rex(magic))
    106		rex_clear_cache();
    107
    108	/* Register the early console.  */
    109	register_prom_console();
    110
    111	/* Were we compiled with the right CPU option? */
    112#if defined(CONFIG_CPU_R3000)
    113	if ((current_cpu_type() == CPU_R4000SC) ||
    114	    (current_cpu_type() == CPU_R4400SC)) {
    115		static const char r4k_msg[] __initconst =
    116			"Please recompile with \"CONFIG_CPU_R4X00 = y\".\n";
    117		printk(cpu_msg);
    118		printk(r4k_msg);
    119		dec_machine_halt();
    120	}
    121#endif
    122
    123#if defined(CONFIG_CPU_R4X00)
    124	if ((current_cpu_type() == CPU_R3000) ||
    125	    (current_cpu_type() == CPU_R3000A)) {
    126		static const char r3k_msg[] __initconst =
    127			"Please recompile with \"CONFIG_CPU_R3000 = y\".\n";
    128		printk(cpu_msg);
    129		printk(r3k_msg);
    130		dec_machine_halt();
    131	}
    132#endif
    133
    134	prom_meminit(magic);
    135	prom_identify_arch(magic);
    136	prom_init_cmdline(argc, argv, magic);
    137}