Orange Pi5 kernel

// 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);