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![Christophe Leroy](/assets/img/avatar_default.png)
'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
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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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#include <asm/inst.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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struct ppc_inst inst = ppc_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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