Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /******************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * features.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Xen feature flags.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Copyright (c) 2006, Ian Campbell, XenSource Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/cache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/xen/hypercall.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <xen/interface/xen.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <xen/interface/version.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <xen/features.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) EXPORT_SYMBOL_GPL(xen_features);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) void xen_setup_features(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	struct xen_feature_info fi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	int i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	for (i = 0; i < XENFEAT_NR_SUBMAPS; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		fi.submap_idx = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		if (HYPERVISOR_xen_version(XENVER_get_features, &fi) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		for (j = 0; j < 32; j++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 			xen_features[i * 32 + j] = !!(fi.submap & 1<<j);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }