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https://github.com/torvalds/linux
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f578055558
Alexandre Ghiti <alexghiti@rivosinc.com> says: The following KASLR implementation allows to randomize the kernel mapping: - virtually: we expect the bootloader to provide a seed in the device-tree - physically: only implemented in the EFI stub, it relies on the firmware to provide a seed using EFI_RNG_PROTOCOL. arm64 has a similar implementation hence the patch 3 factorizes KASLR related functions for riscv to take advantage. The new virtual kernel location is limited by the early page table that only has one PUD and with the PMD alignment constraint, the kernel can only take < 512 positions. * b4-shazam-merge: riscv: libstub: Implement KASLR by using generic functions libstub: Fix compilation warning for rv32 arm64: libstub: Move KASLR handling functions to kaslr.c riscv: Dump out kernel offset information on panic riscv: Introduce virtual kernel mapping KASLR Link: https://lore.kernel.org/r/20230722123850.634544-1-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020 Western Digital Corporation or its affiliates.
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*/
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#ifndef _ASM_EFI_H
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#define _ASM_EFI_H
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#include <asm/csr.h>
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#include <asm/io.h>
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#include <asm/mmu_context.h>
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#include <asm/ptrace.h>
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#include <asm/tlbflush.h>
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#include <asm/pgalloc.h>
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#ifdef CONFIG_EFI
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extern void efi_init(void);
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#else
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#define efi_init()
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#endif
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int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
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int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md, bool);
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#define ARCH_EFI_IRQ_FLAGS_MASK (SR_IE | SR_SPIE)
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/* Load initrd anywhere in system RAM */
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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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/*
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* RISC-V requires the kernel image to placed 2 MB aligned base for 64
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* bit and 4MB for 32 bit.
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*/
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return IS_ENABLED(CONFIG_64BIT) ? SZ_2M : SZ_4M;
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}
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#define EFI_KIMG_PREFERRED_ADDRESS efi_get_kimg_min_align()
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void arch_efi_call_virt_setup(void);
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void arch_efi_call_virt_teardown(void);
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unsigned long stext_offset(void);
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void efi_icache_sync(unsigned long start, unsigned long end);
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#endif /* _ASM_EFI_H */
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