/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2007 MIPS Technologies, Inc. All rights reserved.
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* Copyright (C) 2013 Imagination Technologies Ltd.
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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/smp.h>
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#include <asm/addrspace.h>
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#include <asm/mipsmtregs.h>
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#include <asm/mips-boards/launch.h>
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#include <asm/vpe.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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int 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 -1;
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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 -1;
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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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return 0;
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}
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#ifdef CONFIG_MIPS_VPE_LOADER_CMP
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int vpe_run(struct vpe *v)
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{
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struct vpe_notifications *n;
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if (amon_cpu_start(aprp_cpu_index(), v->__start, 0, 0, 0) < 0)
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return -1;
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list_for_each_entry(n, &v->notify, list)
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n->start(VPE_MODULE_MINOR);
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return 0;
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}
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#endif
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