cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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epapr_paravirt.c (1614B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * ePAPR para-virtualization support.
      4 *
      5 * Copyright (C) 2012 Freescale Semiconductor, Inc.
      6 */
      7
      8#include <linux/of.h>
      9#include <linux/of_fdt.h>
     10#include <asm/epapr_hcalls.h>
     11#include <asm/cacheflush.h>
     12#include <asm/code-patching.h>
     13#include <asm/machdep.h>
     14#include <asm/inst.h>
     15
     16#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
     17extern void epapr_ev_idle(void);
     18extern u32 epapr_ev_idle_start[];
     19#endif
     20
     21bool epapr_paravirt_enabled;
     22static bool __maybe_unused epapr_has_idle;
     23
     24static int __init early_init_dt_scan_epapr(unsigned long node,
     25					   const char *uname,
     26					   int depth, void *data)
     27{
     28	const u32 *insts;
     29	int len;
     30	int i;
     31
     32	insts = of_get_flat_dt_prop(node, "hcall-instructions", &len);
     33	if (!insts)
     34		return 0;
     35
     36	if (len % 4 || len > (4 * 4))
     37		return -1;
     38
     39	for (i = 0; i < (len / 4); i++) {
     40		ppc_inst_t inst = ppc_inst(be32_to_cpu(insts[i]));
     41		patch_instruction(epapr_hypercall_start + i, inst);
     42#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
     43		patch_instruction(epapr_ev_idle_start + i, inst);
     44#endif
     45	}
     46
     47#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
     48	if (of_get_flat_dt_prop(node, "has-idle", NULL))
     49		epapr_has_idle = true;
     50#endif
     51
     52	epapr_paravirt_enabled = true;
     53
     54	return 1;
     55}
     56
     57int __init epapr_paravirt_early_init(void)
     58{
     59	of_scan_flat_dt(early_init_dt_scan_epapr, NULL);
     60
     61	return 0;
     62}
     63
     64static int __init epapr_idle_init(void)
     65{
     66#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
     67	if (epapr_has_idle)
     68		ppc_md.power_save = epapr_ev_idle;
     69#endif
     70
     71	return 0;
     72}
     73
     74postcore_initcall(epapr_idle_init);