projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 39b8d525 RB |
1 | /* |
| 2 | * Copyright (C) 2007 MIPS Technologies, Inc. | |
| 3 | * All rights reserved. | |
| 4 | ||
| 5 | * This program is free software; you can distribute it and/or modify it | |
| 6 | * under the terms of the GNU General Public License (Version 2) as | |
| 7 | * published by the Free Software Foundation. | |
| 8 | * | |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 | * for more details. | |
| 13 | * | |
| 14 | * You should have received a copy of the GNU General Public License along | |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
| 16 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
| 17 | * | |
| 18 | * Arbitrary Monitor interface | |
| 19 | */ | |
| 20 | ||
| 21 | #include <linux/kernel.h> | |
| 22 | #include <linux/init.h> | |
| 23 | #include <linux/smp.h> | |
| 24 | ||
| 25 | #include <asm-mips/addrspace.h> | |
| 26 | #include <asm-mips/mips-boards/launch.h> | |
| 27 | #include <asm-mips/mipsmtregs.h> | |
| 28 | ||
| 29 | int amon_cpu_avail(int cpu) | |
| 30 | { | |
| 938b2b14 | 31 | struct cpulaunch *launch = (struct cpulaunch *)CKSEG0ADDR(CPULAUNCH); |
| 39b8d525 RB |
32 | |
| 33 | if (cpu < 0 || cpu >= NCPULAUNCH) { | |
| 34 | pr_debug("avail: cpu%d is out of range\n", cpu); | |
| 35 | return 0; | |
| 36 | } | |
| 37 | ||
| 38 | launch += cpu; | |
| 39 | if (!(launch->flags & LAUNCH_FREADY)) { | |
| 40 | pr_debug("avail: cpu%d is not ready\n", cpu); | |
| 41 | return 0; | |
| 42 | } | |
| 43 | if (launch->flags & (LAUNCH_FGO|LAUNCH_FGONE)) { | |
| 44 | pr_debug("avail: too late.. cpu%d is already gone\n", cpu); | |
| 45 | return 0; | |
| 46 | } | |
| 47 | ||
| 48 | return 1; | |
| 49 | } | |
| 50 | ||
| 51 | void amon_cpu_start(int cpu, | |
| 52 | unsigned long pc, unsigned long sp, | |
| 53 | unsigned long gp, unsigned long a0) | |
| 54 | { | |
| 55 | volatile struct cpulaunch *launch = | |
| 938b2b14 | 56 | (struct cpulaunch *)CKSEG0ADDR(CPULAUNCH); |
| 39b8d525 RB |
57 | |
| 58 | if (!amon_cpu_avail(cpu)) | |
| 59 | return; | |
| 60 | if (cpu == smp_processor_id()) { | |
| 61 | pr_debug("launch: I am cpu%d!\n", cpu); | |
| 62 | return; | |
| 63 | } | |
| 64 | launch += cpu; | |
| 65 | ||
| 66 | pr_debug("launch: starting cpu%d\n", cpu); | |
| 67 | ||
| 68 | launch->pc = pc; | |
| 69 | launch->gp = gp; | |
| 70 | launch->sp = sp; | |
| 71 | launch->a0 = a0; | |
| 72 | ||
| 73 | /* Make sure target sees parameters before the go bit */ | |
| 74 | smp_mb(); | |
| 75 | ||
| 76 | launch->flags |= LAUNCH_FGO; | |
| 77 | while ((launch->flags & LAUNCH_FGONE) == 0) | |
| 78 | ; | |
| 79 | pr_debug("launch: cpu%d gone!\n", cpu); | |
| 80 | } |