mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2d2682512f
Some systems don't provide a useful device tree to the kernel on boot. Chasing around bootloaders for these systems is a headache, so instead le't's just keep a device tree table in the kernel, keyed by the SOC's unique identifier, that contains the relevant DTB. This is only implemented for M mode right now. While we could implement this via the SBI calls that allow access to these identifiers, we don't have any systems that need this right now. Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2020 Western Digital Corporation or its affiliates.
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* Copyright (C) 2020 Google, Inc
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*/
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#ifndef _ASM_RISCV_SOC_H
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#define _ASM_RISCV_SOC_H
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#include <linux/of.h>
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#include <linux/linkage.h>
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#include <linux/types.h>
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#define SOC_EARLY_INIT_DECLARE(name, compat, fn) \
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static const struct of_device_id __soc_early_init__##name \
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__used __section(__soc_early_init_table) \
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= { .compatible = compat, .data = fn }
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void soc_early_init(void);
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extern unsigned long __soc_early_init_table_start;
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extern unsigned long __soc_early_init_table_end;
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/*
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* Allows Linux to provide a device tree, which is necessary for SOCs that
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* don't provide a useful one on their own.
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*/
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struct soc_builtin_dtb {
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unsigned long vendor_id;
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unsigned long arch_id;
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unsigned long imp_id;
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void *(*dtb_func)(void);
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};
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/*
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* The argument name must specify a valid DTS file name without the dts
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* extension.
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*/
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#define SOC_BUILTIN_DTB_DECLARE(name, vendor, arch, impl) \
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extern void *__dtb_##name##_begin; \
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\
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static __init __used \
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void *__soc_builtin_dtb_f__##name(void) \
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{ \
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return (void *)&__dtb_##name##_begin; \
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} \
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\
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static const struct soc_builtin_dtb __soc_builtin_dtb__##name \
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__used __section(__soc_builtin_dtb_table) = \
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{ \
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.vendor_id = vendor, \
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.arch_id = arch, \
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.imp_id = impl, \
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.dtb_func = __soc_builtin_dtb_f__##name, \
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}
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extern unsigned long __soc_builtin_dtb_table_start;
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extern unsigned long __soc_builtin_dtb_table_end;
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void *soc_lookup_builtin_dtb(void);
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#endif
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