patch-1.3.4 linux/arch/sparc/prom/init.c

• Lines: 80
• Date: Sat Jun 17 10:03:46 1995
• Orig file: v1.3.3/linux/arch/sparc/prom/init.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.3/linux/arch/sparc/prom/init.c linux/arch/sparc/prom/init.c
@@ -0,0 +1,79 @@
+/* init.c:  Initialize internal variables used by the PROM
+ *          library functions.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+
+struct linux_romvec *romvec;
+enum prom_major_version prom_vers;
+unsigned int prom_rev, prom_prev;
+
+/* The root node of the prom device tree. */
+int prom_root_node;
+
+/* 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);
+
+int
+prom_init(struct linux_romvec *rp)
+{
+	if(!rp) return 1;
+	romvec = rp;
+	if(romvec->pv_magic_cookie != LINUX_OPPROM_MAGIC)
+		return 1;
+
+	/* Ok, we seem to have a sane romvec here. */
+	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 4:
+		prom_vers = PROM_P1275;
+		prom_printf("PROMLIB: Sun IEEE Prom not supported yet\n");
+		return 1;
+		break;
+	default:
+		prom_printf("PROMLIB: Bad PROM version %d\n",
+			    romvec->pv_romvers);
+		return 1;
+		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))
+		return 1;
+
+	if((((unsigned long) prom_nodeops) == 0) || 
+	   (((unsigned long) prom_nodeops) == -1))
+		return 1;
+
+	prom_meminit();
+	prom_ranges_init();
+
+	prom_printf("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
+		    romvec->pv_romvers, prom_rev);
+
+	/* Initialization successful. */
+	return 0;
+}