// SPDX-License-Identifier: GPL-2.0-only /* * ePAPR para-virtualization support. * * Copyright (C) 2012 Freescale Semiconductor, Inc. */ #include <linux/of.h> #include <linux/of_fdt.h> #include <asm/epapr_hcalls.h> #include <asm/cacheflush.h> #include <asm/code-patching.h> #include <asm/machdep.h> #include <asm/inst.h> #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) extern void epapr_ev_idle(void); extern u32 epapr_ev_idle_start[]; #endif bool epapr_paravirt_enabled; static bool __maybe_unused epapr_has_idle; static int __init early_init_dt_scan_epapr(unsigned long node, const char *uname, int depth, void *data) { const u32 *insts; int len; int i; insts = of_get_flat_dt_prop(node, "hcall-instructions", &len); if (!insts) return 0; if (len % 4 || len > (4 * 4)) return -1; for (i = 0; i < (len / 4); i++) { struct ppc_inst inst = ppc_inst(be32_to_cpu(insts[i])); patch_instruction((struct ppc_inst *)(epapr_hypercall_start + i), inst); #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) patch_instruction((struct ppc_inst *)(epapr_ev_idle_start + i), inst); #endif } #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) if (of_get_flat_dt_prop(node, "has-idle", NULL)) epapr_has_idle = true; #endif epapr_paravirt_enabled = true; return 1; } int __init epapr_paravirt_early_init(void) { of_scan_flat_dt(early_init_dt_scan_epapr, NULL); return 0; } static int __init epapr_idle_init(void) { #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64) if (epapr_has_idle) ppc_md.power_save = epapr_ev_idle; #endif return 0; } postcore_initcall(epapr_idle_init);