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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
5ead97c8 JF |
2 | /****************************************************************************** |
3 | * features.c | |
4 | * | |
5 | * Xen feature flags. | |
6 | * | |
7 | * Copyright (c) 2006, Ian Campbell, XenSource Inc. | |
8 | */ | |
9 | #include <linux/types.h> | |
10 | #include <linux/cache.h> | |
59aa56bf | 11 | #include <linux/export.h> |
ecbf29cd JF |
12 | |
13 | #include <asm/xen/hypercall.h> | |
14 | ||
15 | #include <xen/interface/xen.h> | |
16 | #include <xen/interface/version.h> | |
5ead97c8 JF |
17 | #include <xen/features.h> |
18 | ||
19 | u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly; | |
20 | EXPORT_SYMBOL_GPL(xen_features); | |
21 | ||
22 | void xen_setup_features(void) | |
23 | { | |
24 | struct xen_feature_info fi; | |
25 | int i, j; | |
26 | ||
27 | for (i = 0; i < XENFEAT_NR_SUBMAPS; i++) { | |
28 | fi.submap_idx = i; | |
29 | if (HYPERVISOR_xen_version(XENVER_get_features, &fi) < 0) | |
30 | break; | |
31 | for (j = 0; j < 32; j++) | |
32 | xen_features[i * 32 + j] = !!(fi.submap & 1<<j); | |
33 | } | |
34 | } |