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03d8273542
Introduce efi_get_kimg_kaslr_address() helper to compute the preferred kernel image load address dynamically when CONFIG_RANDOMIZE_BASE is enabled. The function derives a random offset by using the EFI-provided randomness combined with the timer tick value, and constrains it within CONFIG_RANDOMIZE_BASE_MAX_OFFSET. Update EFI_KIMG_PREFERRED_ADDRESS to call this helper so that the EFI stub can select a randomized load address when KASLR is active, while preserving the original base address behavior when KASLR is disabled or "nokaslr" is specified. Note: LoongArch can't KASLR for hibernation, so set efi_nokaslr to true if "resume=<devname>" is explicitly specified in cmdline. Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: WANG Rui <wangrui@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
38 lines
914 B
C
38 lines
914 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_LOONGARCH_EFI_H
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#define _ASM_LOONGARCH_EFI_H
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#include <linux/efi.h>
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void __init efi_init(void);
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void __init efi_runtime_init(void);
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void __init *efi_fdt_pointer(void);
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void efifb_setup_from_dmi(struct screen_info *si, const char *opt);
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#define ARCH_EFI_IRQ_FLAGS_MASK 0x00000004 /* Bit 2: CSR.CRMD.IE */
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#define arch_efi_call_virt_setup()
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#define arch_efi_call_virt_teardown()
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#define EFI_ALLOC_ALIGN SZ_64K
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#define EFI_RT_VIRTUAL_OFFSET CSR_DMW0_BASE
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static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
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{
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return ULONG_MAX;
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}
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static inline unsigned long efi_get_kimg_min_align(void)
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{
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return SZ_2M;
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}
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unsigned long efi_get_kimg_kaslr_address(void);
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#define EFI_KIMG_PREFERRED_ADDRESS efi_get_kimg_kaslr_address()
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#endif /* _ASM_LOONGARCH_EFI_H */
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