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