1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General Public
3*4882a593Smuzhiyun * License. See the file "COPYING" in the main directory of this archive
4*4882a593Smuzhiyun * for more details.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Copyright (C) 2007 MIPS Technologies, Inc. All rights reserved.
7*4882a593Smuzhiyun * Copyright (C) 2013 Imagination Technologies Ltd.
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * Arbitrary Monitor Interface
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun #include <linux/kernel.h>
12*4882a593Smuzhiyun #include <linux/smp.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include <asm/addrspace.h>
15*4882a593Smuzhiyun #include <asm/mipsmtregs.h>
16*4882a593Smuzhiyun #include <asm/mips-boards/launch.h>
17*4882a593Smuzhiyun #include <asm/vpe.h>
18*4882a593Smuzhiyun
amon_cpu_avail(int cpu)19*4882a593Smuzhiyun int amon_cpu_avail(int cpu)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun struct cpulaunch *launch = (struct cpulaunch *)CKSEG0ADDR(CPULAUNCH);
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun if (cpu < 0 || cpu >= NCPULAUNCH) {
24*4882a593Smuzhiyun pr_debug("avail: cpu%d is out of range\n", cpu);
25*4882a593Smuzhiyun return 0;
26*4882a593Smuzhiyun }
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun launch += cpu;
29*4882a593Smuzhiyun if (!(launch->flags & LAUNCH_FREADY)) {
30*4882a593Smuzhiyun pr_debug("avail: cpu%d is not ready\n", cpu);
31*4882a593Smuzhiyun return 0;
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun if (launch->flags & (LAUNCH_FGO|LAUNCH_FGONE)) {
34*4882a593Smuzhiyun pr_debug("avail: too late.. cpu%d is already gone\n", cpu);
35*4882a593Smuzhiyun return 0;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun return 1;
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
amon_cpu_start(int cpu,unsigned long pc,unsigned long sp,unsigned long gp,unsigned long a0)41*4882a593Smuzhiyun int amon_cpu_start(int cpu,
42*4882a593Smuzhiyun unsigned long pc, unsigned long sp,
43*4882a593Smuzhiyun unsigned long gp, unsigned long a0)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun volatile struct cpulaunch *launch =
46*4882a593Smuzhiyun (struct cpulaunch *)CKSEG0ADDR(CPULAUNCH);
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun if (!amon_cpu_avail(cpu))
49*4882a593Smuzhiyun return -1;
50*4882a593Smuzhiyun if (cpu == smp_processor_id()) {
51*4882a593Smuzhiyun pr_debug("launch: I am cpu%d!\n", cpu);
52*4882a593Smuzhiyun return -1;
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun launch += cpu;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun pr_debug("launch: starting cpu%d\n", cpu);
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun launch->pc = pc;
59*4882a593Smuzhiyun launch->gp = gp;
60*4882a593Smuzhiyun launch->sp = sp;
61*4882a593Smuzhiyun launch->a0 = a0;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun smp_wmb(); /* Target must see parameters before go */
64*4882a593Smuzhiyun launch->flags |= LAUNCH_FGO;
65*4882a593Smuzhiyun smp_wmb(); /* Target must see go before we poll */
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun while ((launch->flags & LAUNCH_FGONE) == 0)
68*4882a593Smuzhiyun ;
69*4882a593Smuzhiyun smp_rmb(); /* Target will be updating flags soon */
70*4882a593Smuzhiyun pr_debug("launch: cpu%d gone!\n", cpu);
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun return 0;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun #ifdef CONFIG_MIPS_VPE_LOADER_CMP
vpe_run(struct vpe * v)76*4882a593Smuzhiyun int vpe_run(struct vpe *v)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun struct vpe_notifications *n;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun if (amon_cpu_start(aprp_cpu_index(), v->__start, 0, 0, 0) < 0)
81*4882a593Smuzhiyun return -1;
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun list_for_each_entry(n, &v->notify, list)
84*4882a593Smuzhiyun n->start(VPE_MODULE_MINOR);
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun return 0;
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun #endif
89