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 early_init_dt_scan_epapr(unsigned long node, 34 const char *uname, 35 int depth, void *data) 36 { 37 const u32 *insts; 38 unsigned long len; 39 int i; 40 41 insts = of_get_flat_dt_prop(node, "hcall-instructions", &len); 42 if (!insts) 43 return 0; 44 45 if (len % 4 || len > (4 * 4)) 46 return -1; 47 48 for (i = 0; i < (len / 4); i++) { 49 patch_instruction(epapr_hypercall_start + i, insts[i]); 50 #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) 51 patch_instruction(epapr_ev_idle_start + i, insts[i]); 52 #endif 53 } 54 55 #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) 56 if (of_get_flat_dt_prop(node, "has-idle", NULL)) 57 ppc_md.power_save = epapr_ev_idle; 58 #endif 59 60 epapr_paravirt_enabled = true; 61 62 return 1; 63 } 64 65 int __init epapr_paravirt_early_init(void) 66 { 67 of_scan_flat_dt(early_init_dt_scan_epapr, NULL); 68 69 return 0; 70 } 71 72