80 lines
2 KiB
C
80 lines
2 KiB
C
/*
|
|
* Copyright (C) 2007 MIPS Technologies, Inc.
|
|
* All rights reserved.
|
|
|
|
* This program is free software; you can distribute it and/or modify it
|
|
* under the terms of the GNU General Public License (Version 2) as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
|
|
*
|
|
* Arbitrary Monitor interface
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/smp.h>
|
|
|
|
#include <asm-mips/addrspace.h>
|
|
#include <asm-mips/mips-boards/launch.h>
|
|
#include <asm-mips/mipsmtregs.h>
|
|
|
|
int amon_cpu_avail(int cpu)
|
|
{
|
|
struct cpulaunch *launch = (struct cpulaunch *)CKSEG0ADDR(CPULAUNCH);
|
|
|
|
if (cpu < 0 || cpu >= NCPULAUNCH) {
|
|
pr_debug("avail: cpu%d is out of range\n", cpu);
|
|
return 0;
|
|
}
|
|
|
|
launch += cpu;
|
|
if (!(launch->flags & LAUNCH_FREADY)) {
|
|
pr_debug("avail: cpu%d is not ready\n", cpu);
|
|
return 0;
|
|
}
|
|
if (launch->flags & (LAUNCH_FGO|LAUNCH_FGONE)) {
|
|
pr_debug("avail: too late.. cpu%d is already gone\n", cpu);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
void amon_cpu_start(int cpu,
|
|
unsigned long pc, unsigned long sp,
|
|
unsigned long gp, unsigned long a0)
|
|
{
|
|
volatile struct cpulaunch *launch =
|
|
(struct cpulaunch *)CKSEG0ADDR(CPULAUNCH);
|
|
|
|
if (!amon_cpu_avail(cpu))
|
|
return;
|
|
if (cpu == smp_processor_id()) {
|
|
pr_debug("launch: I am cpu%d!\n", cpu);
|
|
return;
|
|
}
|
|
launch += cpu;
|
|
|
|
pr_debug("launch: starting cpu%d\n", cpu);
|
|
|
|
launch->pc = pc;
|
|
launch->gp = gp;
|
|
launch->sp = sp;
|
|
launch->a0 = a0;
|
|
|
|
/* Make sure target sees parameters before the go bit */
|
|
smp_mb();
|
|
|
|
launch->flags |= LAUNCH_FGO;
|
|
while ((launch->flags & LAUNCH_FGONE) == 0)
|
|
;
|
|
pr_debug("launch: cpu%d gone!\n", cpu);
|
|
}
|