| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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> |
| 11 | #include <linux/export.h> |
| 12 | |
| 13 | #include <asm/xen/hypercall.h> |
| 14 | |
| 15 | #include <xen/interface/xen.h> |
| 16 | #include <xen/interface/version.h> |
| 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 | } |