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jcastillo |
/* $Id: init_me.c,v 1.1 2005-12-20 09:50:39 jcastillo Exp $
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* init_me.c: Initialize empirical constants and gather some info from
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* the boot prom.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <asm/openprom.h> /* For property declarations and the prom structs */
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#include <asm/oplib.h>
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#include <asm/vac-ops.h>
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#include "empirical.h" /* Don't ask... */
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#define DEBUG_INIT_ME /* Tell me what's going on */
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unsigned int nwindows; /* Set in bare.S */
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unsigned int nwindowsm1;
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unsigned int pac_or_vac; /* 0 means "dunno" 1 means "VAC" 2 means "PAC" */
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unsigned int pvac_size; /* Use the same two variables for a PAC and VAC */
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unsigned int pvac_linesize;
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unsigned int pac_size;
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int num_segmaps;
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int num_contexts;
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unsigned int BOGOMIPS; /* bogosity without the VAC cache on */
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unsigned int BOGOMIPS_WCACHE; /* bogosity with the VAC cache */
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unsigned int delay_factor;
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extern int prom_node_root;
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void (*printk)(const char *str, ...);
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void init_me(void)
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{
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unsigned int grrr;
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printk = romvec->pv_printf;
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prom_node_root = prom_nextnode(0);
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prom_getprop(prom_node_root, "mmu-npmg", &num_segmaps,
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sizeof(unsigned int));
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pvac_size = prom_getint_default(prom_node_root, "vac-size", 65536);
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pvac_linesize = prom_getint_default(prom_node_root, "vac-linesize", 16);
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grrr = prom_getint_default(prom_node_root, "mips-on", 0);
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if(!grrr) {
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grrr = prom_getint_default(prom_node_root, "clock-frequency", 0);
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if(grrr > 15000000 && grrr < 100000000) {
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BOGOMIPS = 3;
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BOGOMIPS_WCACHE = grrr / 1000000;
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} else {
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BOGOMIPS = DEF_BOGO;
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BOGOMIPS_WCACHE = DEF_BOGO;
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}
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} else (BOGOMIPS_WCACHE = grrr,
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BOGOMIPS = prom_getint(prom_node_root, "mips-off"));
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#ifdef DEBUG_INIT_ME
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(*(romvec->pv_printf))("\nBOGOMIPS %d\n", (int) BOGOMIPS);
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(*(romvec->pv_printf))("BOGOMIPS_WCACHE %d\n", (int) BOGOMIPS_WCACHE);
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(*(romvec->pv_printf))("pvac_size %d\n", (int) pvac_size);
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(*(romvec->pv_printf))("pvac_linesize %d\n", (int) pvac_linesize);
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(*(romvec->pv_printf))("num_segmaps %d\n", (int) num_segmaps);
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#endif
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delay_factor = (BOGOMIPS > 3) ? ((BOGOMIPS - 2) >> 1) : 11;
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(*(romvec->pv_printf))("\nLILO: \n");
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return;
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}
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