53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2023 Rivos, Inc
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*/
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#include <linux/types.h>
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#include <vdso/datapage.h>
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#include <vdso/helpers.h>
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extern int riscv_hwprobe(struct riscv_hwprobe *pairs, size_t pair_count,
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size_t cpu_count, unsigned long *cpus,
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unsigned int flags);
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/* Add a prototype to avoid -Wmissing-prototypes warning. */
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int __vdso_riscv_hwprobe(struct riscv_hwprobe *pairs, size_t pair_count,
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size_t cpu_count, unsigned long *cpus,
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unsigned int flags);
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int __vdso_riscv_hwprobe(struct riscv_hwprobe *pairs, size_t pair_count,
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size_t cpu_count, unsigned long *cpus,
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unsigned int flags)
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{
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const struct vdso_data *vd = __arch_get_vdso_data();
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const struct arch_vdso_data *avd = &vd->arch_data;
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bool all_cpus = !cpu_count && !cpus;
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struct riscv_hwprobe *p = pairs;
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struct riscv_hwprobe *end = pairs + pair_count;
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/*
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* Defer to the syscall for exotic requests. The vdso has answers
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* stashed away only for the "all cpus" case. If all CPUs are
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* homogeneous, then this function can handle requests for arbitrary
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* masks.
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*/
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if ((flags != 0) || (!all_cpus && !avd->homogeneous_cpus))
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return riscv_hwprobe(pairs, pair_count, cpu_count, cpus, flags);
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/* This is something we can handle, fill out the pairs. */
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while (p < end) {
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if (p->key <= RISCV_HWPROBE_MAX_KEY) {
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p->value = avd->all_cpu_hwprobe_values[p->key];
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} else {
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p->key = -1;
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p->value = 0;
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}
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p++;
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}
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return 0;
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}
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