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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /arch/mips/mti-malta/malta-amon.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/mips/mti-malta/malta-amon.c')
-rw-r--r-- | arch/mips/mti-malta/malta-amon.c | 88 |
1 files changed, 88 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 000000000..84ac523b0 --- /dev/null +++ b/arch/mips/mti-malta/malta-amon.c @@ -0,0 +1,88 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2007 MIPS Technologies, Inc. All rights reserved. + * Copyright (C) 2013 Imagination Technologies Ltd. + * + * Arbitrary Monitor Interface + */ +#include <linux/kernel.h> +#include <linux/smp.h> + +#include <asm/addrspace.h> +#include <asm/mipsmtregs.h> +#include <asm/mips-boards/launch.h> +#include <asm/vpe.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; +} + +int 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 -1; + if (cpu == smp_processor_id()) { + pr_debug("launch: I am cpu%d!\n", cpu); + return -1; + } + launch += cpu; + + pr_debug("launch: starting cpu%d\n", cpu); + + launch->pc = pc; + launch->gp = gp; + launch->sp = sp; + launch->a0 = a0; + + smp_wmb(); /* Target must see parameters before go */ + launch->flags |= LAUNCH_FGO; + smp_wmb(); /* Target must see go before we poll */ + + while ((launch->flags & LAUNCH_FGONE) == 0) + ; + smp_rmb(); /* Target will be updating flags soon */ + pr_debug("launch: cpu%d gone!\n", cpu); + + return 0; +} + +#ifdef CONFIG_MIPS_VPE_LOADER_CMP +int vpe_run(struct vpe *v) +{ + struct vpe_notifications *n; + + if (amon_cpu_start(aprp_cpu_index(), v->__start, 0, 0, 0) < 0) + return -1; + + list_for_each_entry(n, &v->notify, list) + n->start(VPE_MODULE_MINOR); + + return 0; +} +#endif |