arch/mips/dec/prom/init.c

Source file repositories/reference/linux-study-clean/arch/mips/dec/prom/init.c

File Facts

System
Linux kernel
Corpus path
arch/mips/dec/prom/init.c
Extension
.c
Size
3713 bytes
Lines
142
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * init.c: PROM library initialisation code.
 *
 * Copyright (C) 1998 Harald Koerfgen
 * Copyright (C) 2002, 2004, 2026  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/cpu-type.h>
#include <asm/processor.h>

#include <asm/dec/prom.h>


#ifdef CONFIG_64BIT
unsigned long o32_stk[O32_STK_SIZE] __initdata = { 0 };
#endif

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.
 */
static 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;
	}

Annotation

Implementation Notes