init.c
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上传日期:2013-04-10
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- /* $Id: init.c,v 1.14 2000/01/29 01:09:12 anton Exp $
- * init.c: Initialize internal variables used by the PROM
- * library functions.
- *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- */
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <asm/openprom.h>
- #include <asm/oplib.h>
- #include <asm/sun4prom.h>
- struct linux_romvec *romvec;
- enum prom_major_version prom_vers;
- unsigned int prom_rev, prom_prev;
- linux_sun4_romvec *sun4_romvec;
- /* The root node of the prom device tree. */
- int prom_root_node;
- int prom_stdin, prom_stdout;
- /* Pointer to the device tree operations structure. */
- struct linux_nodeops *prom_nodeops;
- /* You must call prom_init() before you attempt to use any of the
- * routines in the prom library. It returns 0 on success, 1 on
- * failure. It gets passed the pointer to the PROM vector.
- */
- extern void prom_meminit(void);
- extern void prom_ranges_init(void);
- void __init prom_init(struct linux_romvec *rp)
- {
- #ifdef CONFIG_SUN4
- extern struct linux_romvec *sun4_prom_init(void);
- rp = sun4_prom_init();
- #endif
- romvec = rp;
- switch(romvec->pv_romvers) {
- case 0:
- prom_vers = PROM_V0;
- break;
- case 2:
- prom_vers = PROM_V2;
- break;
- case 3:
- prom_vers = PROM_V3;
- break;
- case 40:
- prom_vers = PROM_SUN4;
- break;
- default:
- prom_printf("PROMLIB: Bad PROM version %dn",
- romvec->pv_romvers);
- prom_halt();
- break;
- };
- prom_rev = romvec->pv_plugin_revision;
- prom_prev = romvec->pv_printrev;
- prom_nodeops = romvec->pv_nodeops;
- prom_root_node = prom_getsibling(0);
- if((prom_root_node == 0) || (prom_root_node == -1))
- prom_halt();
- if((((unsigned long) prom_nodeops) == 0) ||
- (((unsigned long) prom_nodeops) == -1))
- prom_halt();
- if(prom_vers == PROM_V2 || prom_vers == PROM_V3) {
- prom_stdout = *romvec->pv_v2bootargs.fd_stdout;
- prom_stdin = *romvec->pv_v2bootargs.fd_stdin;
- }
-
- prom_meminit();
- prom_ranges_init();
- #ifndef CONFIG_SUN4
- /* SUN4 prints this in sun4_prom_init */
- printk("PROMLIB: Sun Boot Prom Version %d Revision %dn",
- romvec->pv_romvers, prom_rev);
- #endif
- /* Initialization successful. */
- return;
- }