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74 lines
1.6 KiB
74 lines
1.6 KiB
// 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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