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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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1349ea08e8
Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: David S. Miller <davem@davemloft.net>
79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
/*
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* init.c: Initialize internal variables used by the PROM
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* library functions.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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struct linux_romvec *romvec;
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EXPORT_SYMBOL(romvec);
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enum prom_major_version prom_vers;
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unsigned int prom_rev, prom_prev;
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/* The root node of the prom device tree. */
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int prom_root_node;
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EXPORT_SYMBOL(prom_root_node);
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/* Pointer to the device tree operations structure. */
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struct linux_nodeops *prom_nodeops;
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/* You must call prom_init() before you attempt to use any of the
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* routines in the prom library. It returns 0 on success, 1 on
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* failure. It gets passed the pointer to the PROM vector.
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*/
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extern void prom_meminit(void);
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extern void prom_ranges_init(void);
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void __init prom_init(struct linux_romvec *rp)
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{
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romvec = rp;
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switch(romvec->pv_romvers) {
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case 0:
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prom_vers = PROM_V0;
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break;
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case 2:
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prom_vers = PROM_V2;
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break;
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case 3:
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prom_vers = PROM_V3;
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break;
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default:
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prom_printf("PROMLIB: Bad PROM version %d\n",
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romvec->pv_romvers);
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prom_halt();
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break;
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};
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prom_rev = romvec->pv_plugin_revision;
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prom_prev = romvec->pv_printrev;
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prom_nodeops = romvec->pv_nodeops;
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prom_root_node = prom_getsibling(0);
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if((prom_root_node == 0) || (prom_root_node == -1))
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prom_halt();
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if((((unsigned long) prom_nodeops) == 0) ||
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(((unsigned long) prom_nodeops) == -1))
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prom_halt();
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prom_meminit();
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prom_ranges_init();
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printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
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romvec->pv_romvers, prom_rev);
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/* Initialization successful. */
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}
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