mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-29 12:19:39 +00:00
69d4d6e5fd
'struct ppc_inst' is an internal representation of an instruction, but in-memory instructions are and will remain a table of 'u32' forever. Replace all 'struct ppc_inst *' used for locating an instruction in memory by 'u32 *'. This removes a lot of undue casts to 'struct ppc_inst *'. It also helps locating ab-use of 'struct ppc_inst' dereference. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> [mpe: Fix ppc_inst_next(), use u32 instead of unsigned int] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/7062722b087228e42cbd896e39bfdf526d6a340a.1621516826.git.christophe.leroy@csgroup.eu
74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
// 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(epapr_hypercall_start + i, inst);
|
|
#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
|
|
patch_instruction(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);
|