2 * ePAPR para-virtualization support.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17 * Copyright (C) 2012 Freescale Semiconductor, Inc.
21 #include <asm/epapr_hcalls.h>
22 #include <asm/cacheflush.h>
23 #include <asm/code-patching.h>
24 #include <asm/machdep.h>
26 #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
27 extern void epapr_ev_idle(void);
28 extern u32 epapr_ev_idle_start[];
31 bool epapr_paravirt_enabled;
33 static int __init epapr_paravirt_init(void)
35 struct device_node *hyper_node;
39 hyper_node = of_find_node_by_path("/hypervisor");
43 insts = of_get_property(hyper_node, "hcall-instructions", &len);
47 if (len % 4 || len > (4 * 4))
50 for (i = 0; i < (len / 4); i++) {
51 patch_instruction(epapr_hypercall_start + i, insts[i]);
52 #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
53 patch_instruction(epapr_ev_idle_start + i, insts[i]);
57 #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
58 if (of_get_property(hyper_node, "has-idle", NULL))
59 ppc_md.power_save = epapr_ev_idle;
62 epapr_paravirt_enabled = true;
67 early_initcall(epapr_paravirt_init);