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cpu.c revision 1.3 
      1 /*	$NetBSD: cpu.c,v 1.3 1999/06/28 01:20:44 sakamoto Exp $	*/
      2 
      3 /*
      4  * This file contains information proprietary to Be Inc.
      5  */
      6 
      7 /*-
      8  * Copyright (C) 1995-1997 Gary Thomas (gdt (at) linuxppc.org)
      9  * All rights reserved.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *      This product includes software developed by Gary Thomas.
     22  * 4. The name of the author may not be used to endorse or promote products
     23  *    derived from this software without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     26  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     28  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     29  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     31  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     34  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     35  */
     36 
     37 #include <stand.h>
     38 #include "boot.h"
     39 
     40 /*
     41  * Return the ordinal of the CPU on which the code runs (0/1)
     42  */
     43 
     44 #define	CPU1_HRESET	0x20000000
     45 
     46 int
     47 whichCPU()
     48 {
     49 	volatile unsigned long *CPU_control = (unsigned long *)0x7FFFF3F0;
     50 
     51 	if (*CPU_control & 0x02000000) {
     52 		return (1);
     53 	} else {
     54 		return (0);
     55 	}
     56 }
     57 
     58 /*
     59  * Force CPU #1 into Hard RESET state
     60  */
     61 
     62 void
     63 resetCPU1()
     64 {
     65 	volatile unsigned long *CPU_control = (unsigned long *)0x7FFFF4F0;
     66 
     67 	*CPU_control = CPU1_HRESET;
     68 }
     69 
     70 /*
     71  * Return state of CPU RESET register
     72  */
     73 unsigned long
     74 cpuState()
     75 {
     76 	volatile unsigned long *CPU_control = (unsigned long *)0x7FFFF4F0;
     77 
     78 	return (*CPU_control);
     79 }
     80 
     81 /*
     82  * Start CPU #1
     83  */
     84 void
     85 runCPU1(entry)
     86 	void *entry;
     87 {
     88 	volatile unsigned long *CPU_control = (unsigned long *)0x7FFFF4F0;
     89 	long *PEF_vector = (long *)0x3000;
     90 	long *PEF_vector2 = (long *)0x3018;
     91 
     92 	PEF_vector[0] = 0;
     93 	PEF_vector[1] = 0;
     94 	PEF_vector[2] = 0;
     95 	PEF_vector[3] = 0;
     96 	PEF_vector[0] = 0;
     97 	PEF_vector2[0] = 0;
     98 	*CPU_control = 0x80000000 | CPU1_HRESET;
     99 	/* Give the other CPU a chance to find the zero value */
    100 	delay(1000);
    101 	PEF_vector[0] = (long)entry;
    102 	PEF_vector[1] = (long)entry;
    103 	PEF_vector[2] = (long)entry;
    104 	PEF_vector[3] = (long)entry;
    105 	PEF_vector[0] = (long)entry;
    106 	PEF_vector2[0] = (long)entry;
    107 }
    108 
    109 /*
    110  * CPU #1 runs here
    111  */
    112 volatile int cpu_ctr = 0;
    113 
    114 void
    115 cpu1()
    116 {
    117 	while (1)
    118 		cpu_ctr++;
    119 }
    120 
    121 volatile int CPU1_alive = 0;
    122 
    123 void
    124 start_CPU1()
    125 {
    126 	volatile long *key = (volatile long *)0x0080;
    127 
    128 	CPU1_alive++;
    129 	*key = 0;
    130 	/* Wait for a kernel to load up a vector of where we should jump */
    131 	while (*key == 0)
    132 		delay(10);
    133 
    134 	run(NULL, NULL, NULL, NULL, (void *)*key);
    135 }
    136 
    137 void
    138 wait_for(ptr)
    139 	volatile int *ptr;
    140 {
    141 	int i;
    142 	for (i = 0; i < 10; i++) {
    143 		if (*ptr)
    144 			return;
    145 		delay(10);
    146 	}
    147 	printf("CPU #1 didn't start!\n");
    148 }
    149