1 /* 2 * ePAPR para-virtualization support. 3 * 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. 7 * 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. 12 * 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. 16 * 17 * Copyright (C) 2012 Freescale Semiconductor, Inc. 18 */ 19 20 #include <linux/of.h> 21 #include <asm/epapr_hcalls.h> 22 #include <asm/cacheflush.h> 23 #include <asm/code-patching.h> 24 #include <asm/machdep.h> 25 26 #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) 27 extern void epapr_ev_idle(void); 28 extern u32 epapr_ev_idle_start[]; 29 #endif 30 31 bool epapr_paravirt_enabled; 32 33 static int __init epapr_paravirt_init(void) 34 { 35 struct device_node *hyper_node; 36 const u32 *insts; 37 int len, i; 38 39 hyper_node = of_find_node_by_path("/hypervisor"); 40 if (!hyper_node) 41 return -ENODEV; 42 43 insts = of_get_property(hyper_node, "hcall-instructions", &len); 44 if (!insts) 45 return -ENODEV; 46 47 if (len % 4 || len > (4 * 4)) 48 return -ENODEV; 49 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]); 54 #endif 55 } 56 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; 60 #endif 61 62 epapr_paravirt_enabled = true; 63 64 return 0; 65 } 66 67 early_initcall(epapr_paravirt_init); 68