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cpu.c revision 1.1 
      1 /*	$Id: cpu.c,v 1.1 1998/01/16 04:17:42 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 /*
     38  * Return the ordinal of the CPU on which the code runs (0/1)
     39  */
     40 
     41 #define CPU1_HRESET 0x20000000
     42 
     43 int
     44 whichCPU()
     45 {
     46 	volatile unsigned long *CPU_control = (unsigned long *)0x7FFFF3F0;
     47 	if (*CPU_control & 0x02000000)
     48 	{
     49 		return (1);
     50 	} else
     51 	{
     52 		return (0);
     53 	}
     54 }
     55 
     56 /*
     57  * Force CPU #1 into Hard RESET state
     58  */
     59 
     60 void
     61 resetCPU1()
     62 {
     63 	volatile unsigned long *CPU_control = (unsigned long *)0x7FFFF4F0;
     64 	*CPU_control = CPU1_HRESET;
     65 }
     66 
     67 /*
     68  * Return state of CPU RESET register
     69  */
     70 unsigned long
     71 cpuState()
     72 {
     73 	volatile unsigned long *CPU_control = (unsigned long *)0x7FFFF4F0;
     74 	return (*CPU_control);
     75 }
     76 
     77 /*
     78  * Start CPU #1
     79  */
     80 void
     81 runCPU1(entry)
     82 	long entry;
     83 {
     84 	volatile unsigned long *CPU_control = (unsigned long *)0x7FFFF4F0;
     85 	long *PEF_vector = (long *)0x3000;
     86 	long *PEF_vector2 = (long *)0x3018;
     87 	int i;
     88 	PEF_vector[0] = 0;
     89 	PEF_vector[1] = 0;
     90 	PEF_vector[2] = 0;
     91 	PEF_vector[3] = 0;
     92 	PEF_vector[0] = 0;
     93 	PEF_vector2[0] = 0;
     94 	*CPU_control = 0x80000000 | CPU1_HRESET;
     95 	/* Give the other CPU a chance to find the zero value */
     96 	delay(1000);
     97 	PEF_vector[0] = entry;
     98 	PEF_vector[1] = entry;
     99 	PEF_vector[2] = entry;
    100 	PEF_vector[3] = entry;
    101 	PEF_vector[0] = entry;
    102 	PEF_vector2[0] = entry;
    103 }
    104 
    105 /*
    106  * CPU #1 runs here
    107  */
    108 volatile int cpu_ctr = 0;
    109 
    110 cpu1()
    111 {
    112 	while(1) cpu_ctr++;
    113 }
    114 
    115 volatile int CPU1_alive = 0;
    116 
    117 void
    118 start_CPU1()
    119 {
    120 	volatile long *key = (volatile long *)0x0080;
    121 
    122 	CPU1_alive++;
    123 	*key = 0;
    124 	/* Wait for a kernel to load up a vector of where we should jump */
    125 	while (*key == 0) {
    126 		delay(10);
    127 	}
    128 	run(*key);
    129 }
    130 
    131 void
    132 wait_for(ptr)
    133 	volatile long *ptr;
    134 {
    135 	int i;
    136 	for (i = 0; i < 10; i++) {
    137 		if (*ptr)
    138 			return;
    139 		delay(10);
    140 	}
    141 	printf("CPU #1 didn't start!\n");
    142 }
    143