d94d71cb45
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation 51 franklin street fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 67 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141333.953658117@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ePAPR para-virtualization support.
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*
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* Copyright (C) 2012 Freescale Semiconductor, Inc.
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*/
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <asm/epapr_hcalls.h>
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#include <asm/cacheflush.h>
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#include <asm/code-patching.h>
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#include <asm/machdep.h>
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#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
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extern void epapr_ev_idle(void);
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extern u32 epapr_ev_idle_start[];
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#endif
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bool epapr_paravirt_enabled;
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static bool __maybe_unused epapr_has_idle;
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static int __init early_init_dt_scan_epapr(unsigned long node,
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const char *uname,
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int depth, void *data)
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{
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const u32 *insts;
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int len;
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int i;
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insts = of_get_flat_dt_prop(node, "hcall-instructions", &len);
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if (!insts)
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return 0;
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if (len % 4 || len > (4 * 4))
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return -1;
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for (i = 0; i < (len / 4); i++) {
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u32 inst = be32_to_cpu(insts[i]);
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patch_instruction(epapr_hypercall_start + i, inst);
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#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
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patch_instruction(epapr_ev_idle_start + i, inst);
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#endif
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}
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#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
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if (of_get_flat_dt_prop(node, "has-idle", NULL))
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epapr_has_idle = true;
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#endif
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epapr_paravirt_enabled = true;
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return 1;
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}
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int __init epapr_paravirt_early_init(void)
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{
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of_scan_flat_dt(early_init_dt_scan_epapr, NULL);
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return 0;
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}
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static int __init epapr_idle_init(void)
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{
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#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
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if (epapr_has_idle)
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ppc_md.power_save = epapr_ev_idle;
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#endif
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return 0;
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}
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postcore_initcall(epapr_idle_init);
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