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| author | Ingo Molnar <mingo@elte.hu> | 2008-07-18 18:43:08 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-18 18:43:08 +0200 |
| commit | f1b0c8d3d3b5ff9c0b14bb2383a4bc38d8922bd1 (patch) | |
| tree | b7d9f439d5b99d8b03bf490d4b17156414e48d45 /arch/mips/mti-malta/malta-amon.c | |
| parent | d591b0a3ae25f587d0c4da1e1d1a425143590790 (diff) | |
| parent | 5b664cb235e97afbf34db9c4d77f08ebd725335e (diff) | |
Merge branch 'linus' into x86/amd-iommu
Diffstat (limited to 'arch/mips/mti-malta/malta-amon.c')
| -rw-r--r-- | arch/mips/mti-malta/malta-amon.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/mips/mti-malta/malta-amon.c b/arch/mips/mti-malta/malta-amon.c new file mode 100644 index 00000000000..96236bf3383 --- /dev/null +++ b/arch/mips/mti-malta/malta-amon.c @@ -0,0 +1,80 @@ +/* + * 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); +} |