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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/addrspace.h>
26#include <asm/mips-boards/launch.h>
27#include <asm/mipsmtregs.h>
28
29int amon_cpu_avail(int cpu)
30{
31 struct cpulaunch *launch = (struct cpulaunch *)CKSEG0ADDR(CPULAUNCH);
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
51void 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 =
56 (struct cpulaunch *)CKSEG0ADDR(CPULAUNCH);
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 smp_wmb(); /* Target must see parameters before go */
74 launch->flags |= LAUNCH_FGO;
75 smp_wmb(); /* Target must see go before we poll */
76
77 while ((launch->flags & LAUNCH_FGONE) == 0)
78 ;
79 smp_rmb(); /* Target will be updating flags soon */
80 pr_debug("launch: cpu%d gone!\n", cpu);
81}
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2007 MIPS Technologies, Inc. All rights reserved.
7 * Copyright (C) 2013 Imagination Technologies Ltd.
8 *
9 * Arbitrary Monitor Interface
10 */
11#include <linux/kernel.h>
12#include <linux/smp.h>
13
14#include <asm/addrspace.h>
15#include <asm/mipsmtregs.h>
16#include <asm/mips-boards/launch.h>
17#include <asm/vpe.h>
18
19int amon_cpu_avail(int cpu)
20{
21 struct cpulaunch *launch = (struct cpulaunch *)CKSEG0ADDR(CPULAUNCH);
22
23 if (cpu < 0 || cpu >= NCPULAUNCH) {
24 pr_debug("avail: cpu%d is out of range\n", cpu);
25 return 0;
26 }
27
28 launch += cpu;
29 if (!(launch->flags & LAUNCH_FREADY)) {
30 pr_debug("avail: cpu%d is not ready\n", cpu);
31 return 0;
32 }
33 if (launch->flags & (LAUNCH_FGO|LAUNCH_FGONE)) {
34 pr_debug("avail: too late.. cpu%d is already gone\n", cpu);
35 return 0;
36 }
37
38 return 1;
39}
40
41int amon_cpu_start(int cpu,
42 unsigned long pc, unsigned long sp,
43 unsigned long gp, unsigned long a0)
44{
45 volatile struct cpulaunch *launch =
46 (struct cpulaunch *)CKSEG0ADDR(CPULAUNCH);
47
48 if (!amon_cpu_avail(cpu))
49 return -1;
50 if (cpu == smp_processor_id()) {
51 pr_debug("launch: I am cpu%d!\n", cpu);
52 return -1;
53 }
54 launch += cpu;
55
56 pr_debug("launch: starting cpu%d\n", cpu);
57
58 launch->pc = pc;
59 launch->gp = gp;
60 launch->sp = sp;
61 launch->a0 = a0;
62
63 smp_wmb(); /* Target must see parameters before go */
64 launch->flags |= LAUNCH_FGO;
65 smp_wmb(); /* Target must see go before we poll */
66
67 while ((launch->flags & LAUNCH_FGONE) == 0)
68 ;
69 smp_rmb(); /* Target will be updating flags soon */
70 pr_debug("launch: cpu%d gone!\n", cpu);
71
72 return 0;
73}
74
75#ifdef CONFIG_MIPS_VPE_LOADER_CMP
76int vpe_run(struct vpe *v)
77{
78 struct vpe_notifications *n;
79
80 if (amon_cpu_start(aprp_cpu_index(), v->__start, 0, 0, 0) < 0)
81 return -1;
82
83 list_for_each_entry(n, &v->notify, list)
84 n->start(VPE_MODULE_MINOR);
85
86 return 0;
87}
88#endif