Sam Edwards
b868fff5b1
This is a type-correctness cleanup to MMU/boot code that replaces several instances of void * and u64 with phys_addr_t (to represent addresses) and resource_size_t (to represent sizes) to emphasize that the code in question concerns physical memory specifically. The rationale for this change is to improve clarity and readability in a few modules that handle both types (physical and virtual) of address and differentiation is essential. I have left u64 in cases where the address may be either physical or virtual, where the address is exclusively virtual but used in heavy pointer arithmetic, and in cases I may have overlooked. I do not necessarily consider u64 the ideal type in those situations, but it avoids breaking existing semantics in this cleanup. This patch provably has no effect at runtime: I have verified that .text of vmlinux is identical after this change. Signed-off-by: Sam Edwards <CFSworks@gmail.com> Signed-off-by: Will Deacon <will@kernel.org>
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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// Copyright 2023 Google LLC
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// Author: Ard Biesheuvel <ardb@google.com>
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#include <linux/types.h>
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#define __prel64_initconst __section(".init.rodata.prel64")
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#define PREL64(type, name) union { type *name; prel64_t name ## _prel; }
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#define prel64_pointer(__d) (typeof(__d))prel64_to_pointer(&__d##_prel)
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typedef volatile signed long prel64_t;
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static inline void *prel64_to_pointer(const prel64_t *offset)
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{
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if (!*offset)
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return NULL;
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return (void *)offset + *offset;
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}
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extern bool dynamic_scs_is_enabled;
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extern pgd_t init_idmap_pg_dir[], init_idmap_pg_end[];
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extern pgd_t init_pg_dir[], init_pg_end[];
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void init_feature_override(u64 boot_status, const void *fdt, int chosen);
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u64 kaslr_early_init(void *fdt, int chosen);
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void relocate_kernel(u64 offset);
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int scs_patch(const u8 eh_frame[], int size);
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void map_range(phys_addr_t *pte, u64 start, u64 end, phys_addr_t pa,
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pgprot_t prot, int level, pte_t *tbl, bool may_use_cont,
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u64 va_offset);
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asmlinkage void early_map_kernel(u64 boot_status, phys_addr_t fdt);
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asmlinkage phys_addr_t create_init_idmap(pgd_t *pgd, ptdesc_t clrmask);
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