patch-1.3.4 linux/arch/sparc/boot/init_me.c

• Lines: 69
• Date: Thu Jun 8 23:49:39 1995
• Orig file: v1.3.3/linux/arch/sparc/boot/init_me.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.3/linux/arch/sparc/boot/init_me.c linux/arch/sparc/boot/init_me.c
@@ -0,0 +1,68 @@
+/* init_me.c:  Initialize imperical constants and gather some info from
+ *             the boot prom.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <asm/openprom.h>  /* For property declarations and the prom structs */
+#include <asm/oplib.h>
+#include <asm/vac-ops.h>
+
+#include "imperical.h"   /* Don't ask... */
+
+#define DEBUG_INIT_ME    /* Tell me whats goin on */
+
+unsigned int nwindows;   /* Set in bare.S */
+unsigned int nwindowsm1;
+unsigned int pac_or_vac; /* 0 means "dunno" 1 means "VAC" 2 means "PAC" */
+unsigned int pvac_size;  /* Use the same two variables for a PAC and VAC */
+unsigned int pvac_linesize;
+unsigned int pac_size;
+int num_segmaps;
+int num_contexts;
+unsigned int BOGOMIPS;        /* bogosity without the VAC cache on */
+unsigned int BOGOMIPS_WCACHE; /* bogosity with the VAC cache */
+unsigned int delay_factor;
+
+extern int prom_node_root;
+void (*printk)(const char *str, ...);
+
+void init_me(void)
+{
+	unsigned int grrr;
+
+	printk = romvec->pv_printf;
+	prom_node_root = prom_nextnode(0);
+	prom_getprop(prom_node_root, "mmu-npmg", &num_segmaps,
+		     sizeof(unsigned int));
+
+	pvac_size = prom_getint_default(prom_node_root, "vac-size", 65536);
+
+	pvac_linesize = prom_getint_default(prom_node_root, "vac-linesize", 16);
+	
+	grrr = prom_getint_default(prom_node_root, "mips-on", 0);
+	if(!grrr) {
+		grrr = prom_getint_default(prom_node_root, "clock-frequency", 0);
+		if(grrr > 15000000 && grrr < 100000000) {
+			BOGOMIPS = 3;
+			BOGOMIPS_WCACHE = grrr / 1000000;
+		} else {
+			BOGOMIPS = DEF_BOGO;
+			BOGOMIPS_WCACHE = DEF_BOGO;
+		}
+	} else (BOGOMIPS_WCACHE = grrr, 
+		BOGOMIPS = prom_getint(prom_node_root, "mips-off"));
+
+#ifdef DEBUG_INIT_ME
+	(*(romvec->pv_printf))("\nBOGOMIPS        %d\n", (int) BOGOMIPS);
+	(*(romvec->pv_printf))("BOGOMIPS_WCACHE %d\n", (int) BOGOMIPS_WCACHE);
+	(*(romvec->pv_printf))("pvac_size        %d\n", (int) pvac_size);
+	(*(romvec->pv_printf))("pvac_linesize    %d\n", (int) pvac_linesize);
+	(*(romvec->pv_printf))("num_segmaps     %d\n", (int) num_segmaps);
+#endif
+
+	delay_factor = (BOGOMIPS > 3) ? ((BOGOMIPS - 2) >> 1) : 11;
+
+	(*(romvec->pv_printf))("\nLILO: \n");
+	return;
+}