mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 22:26:12 +00:00
10cc352907
This saves a few k on systems which only ever ship with a single CPU type. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
/*
|
|
* init.c: PROM library initialisation code.
|
|
*
|
|
* Copyright (C) 1998 Harald Koerfgen
|
|
* Copyright (C) 2002, 2004 Maciej W. Rozycki
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/linkage.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/cpu.h>
|
|
#include <asm/processor.h>
|
|
|
|
#include <asm/dec/prom.h>
|
|
|
|
|
|
int (*__rex_bootinit)(void);
|
|
int (*__rex_bootread)(void);
|
|
int (*__rex_getbitmap)(memmap *);
|
|
unsigned long *(*__rex_slot_address)(int);
|
|
void *(*__rex_gettcinfo)(void);
|
|
int (*__rex_getsysid)(void);
|
|
void (*__rex_clear_cache)(void);
|
|
|
|
int (*__prom_getchar)(void);
|
|
char *(*__prom_getenv)(char *);
|
|
int (*__prom_printf)(char *, ...);
|
|
|
|
int (*__pmax_open)(char*, int);
|
|
int (*__pmax_lseek)(int, long, int);
|
|
int (*__pmax_read)(int, void *, int);
|
|
int (*__pmax_close)(int);
|
|
|
|
|
|
/*
|
|
* Detect which PROM the DECSTATION has, and set the callback vectors
|
|
* appropriately.
|
|
*/
|
|
void __init which_prom(s32 magic, s32 *prom_vec)
|
|
{
|
|
/*
|
|
* No sign of the REX PROM's magic number means we assume a non-REX
|
|
* machine (i.e. we're on a DS2100/3100, DS5100 or DS5000/2xx)
|
|
*/
|
|
if (prom_is_rex(magic)) {
|
|
/*
|
|
* Set up prom abstraction structure with REX entry points.
|
|
*/
|
|
__rex_bootinit =
|
|
(void *)(long)*(prom_vec + REX_PROM_BOOTINIT);
|
|
__rex_bootread =
|
|
(void *)(long)*(prom_vec + REX_PROM_BOOTREAD);
|
|
__rex_getbitmap =
|
|
(void *)(long)*(prom_vec + REX_PROM_GETBITMAP);
|
|
__prom_getchar =
|
|
(void *)(long)*(prom_vec + REX_PROM_GETCHAR);
|
|
__prom_getenv =
|
|
(void *)(long)*(prom_vec + REX_PROM_GETENV);
|
|
__rex_getsysid =
|
|
(void *)(long)*(prom_vec + REX_PROM_GETSYSID);
|
|
__rex_gettcinfo =
|
|
(void *)(long)*(prom_vec + REX_PROM_GETTCINFO);
|
|
__prom_printf =
|
|
(void *)(long)*(prom_vec + REX_PROM_PRINTF);
|
|
__rex_slot_address =
|
|
(void *)(long)*(prom_vec + REX_PROM_SLOTADDR);
|
|
__rex_clear_cache =
|
|
(void *)(long)*(prom_vec + REX_PROM_CLEARCACHE);
|
|
} else {
|
|
/*
|
|
* Set up prom abstraction structure with non-REX entry points.
|
|
*/
|
|
__prom_getchar = (void *)PMAX_PROM_GETCHAR;
|
|
__prom_getenv = (void *)PMAX_PROM_GETENV;
|
|
__prom_printf = (void *)PMAX_PROM_PRINTF;
|
|
__pmax_open = (void *)PMAX_PROM_OPEN;
|
|
__pmax_lseek = (void *)PMAX_PROM_LSEEK;
|
|
__pmax_read = (void *)PMAX_PROM_READ;
|
|
__pmax_close = (void *)PMAX_PROM_CLOSE;
|
|
}
|
|
}
|
|
|
|
void __init prom_init(void)
|
|
{
|
|
extern void dec_machine_halt(void);
|
|
static char cpu_msg[] __initdata =
|
|
"Sorry, this kernel is compiled for a wrong CPU type!\n";
|
|
s32 argc = fw_arg0;
|
|
s32 *argv = (void *)fw_arg1;
|
|
u32 magic = fw_arg2;
|
|
s32 *prom_vec = (void *)fw_arg3;
|
|
|
|
/*
|
|
* Determine which PROM we have
|
|
* (and therefore which machine we're on!)
|
|
*/
|
|
which_prom(magic, prom_vec);
|
|
|
|
if (prom_is_rex(magic))
|
|
rex_clear_cache();
|
|
|
|
/* Register the early console. */
|
|
register_prom_console();
|
|
|
|
/* Were we compiled with the right CPU option? */
|
|
#if defined(CONFIG_CPU_R3000)
|
|
if ((current_cpu_type() == CPU_R4000SC) ||
|
|
(current_cpu_type() == CPU_R4400SC)) {
|
|
static char r4k_msg[] __initdata =
|
|
"Please recompile with \"CONFIG_CPU_R4x00 = y\".\n";
|
|
printk(cpu_msg);
|
|
printk(r4k_msg);
|
|
dec_machine_halt();
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_CPU_R4X00)
|
|
if ((current_cpu_type() == CPU_R3000) ||
|
|
(current_cpu_type() == CPU_R3000A)) {
|
|
static char r3k_msg[] __initdata =
|
|
"Please recompile with \"CONFIG_CPU_R3000 = y\".\n";
|
|
printk(cpu_msg);
|
|
printk(r3k_msg);
|
|
dec_machine_halt();
|
|
}
|
|
#endif
|
|
|
|
prom_meminit(magic);
|
|
prom_identify_arch(magic);
|
|
prom_init_cmdline(argc, argv, magic);
|
|
}
|