init.c
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上传日期:2013-02-24
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- /* $Id: init.c,v 1.10 1999/09/21 14:35:59 davem Exp $
- * init.c: Initialize internal variables used by the PROM
- * library functions.
- *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- */
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/string.h>
- #include <linux/ctype.h>
- #include <asm/openprom.h>
- #include <asm/oplib.h>
- enum prom_major_version prom_vers;
- unsigned int prom_rev, prom_prev;
- /* The root node of the prom device tree. */
- int prom_root_node;
- int prom_stdin, prom_stdout;
- int prom_chosen_node;
- /* 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_cif_init(void *, void *);
- void __init prom_init(void *cif_handler, void *cif_stack)
- {
- char buffer[80], *p;
- int ints[3];
- int node;
- int i = 0;
- prom_vers = PROM_P1275;
- prom_cif_init(cif_handler, cif_stack);
- prom_root_node = prom_getsibling(0);
- if((prom_root_node == 0) || (prom_root_node == -1))
- prom_halt();
- prom_chosen_node = prom_finddevice("/chosen");
- if (!prom_chosen_node || prom_chosen_node == -1)
- prom_halt();
- prom_stdin = prom_getint (prom_chosen_node, "stdin");
- prom_stdout = prom_getint (prom_chosen_node, "stdout");
- node = prom_finddevice("/openprom");
- if (!node || node == -1)
- prom_halt();
- prom_getstring (node, "version", buffer, sizeof (buffer));
- prom_printf ("n");
- if (strncmp (buffer, "OBP ", 4))
- goto strange_version;
- /* Version field is expected to be 'OBP xx.yy.zz date...' */
- p = buffer + 4;
- while (p && isdigit(*p) && i < 3) {
- ints[i++] = simple_strtoul(p, NULL, 0);
- if ((p = strchr(p, '.')) != NULL)
- p++;
- }
- if (i != 3)
- goto strange_version;
- prom_rev = ints[1];
- prom_prev = (ints[0] << 16) | (ints[1] << 8) | ints[2];
- printk ("PROMLIB: Sun IEEE Boot Prom %sn", buffer + 4);
- prom_meminit();
- /* Initialization successful. */
- return;
- strange_version:
- prom_printf ("Strange OBP version `%s'.n", buffer);
- prom_halt ();
- }