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riscv: libstub: Implement KASLR by using generic functions
We can now use arm64 functions to handle the move of the kernel physical mapping: if KASLR is enabled, we will try to get a random seed from the firmware, if not possible, the kernel will be moved to a location that suits its alignment constraints. Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Tested-by: Conor Dooley <conor.dooley@microchip.com> Tested-by: Song Shuai <songshuaishuai@tinylab.org> Reviewed-by: Sami Tolvanen <samitolvanen@google.com> Tested-by: Sami Tolvanen <samitolvanen@google.com> Link: https://lore.kernel.org/r/20230722123850.634544-6-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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@ -51,4 +51,6 @@ void efi_virtmap_unload(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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@ -27,6 +27,7 @@ __efistub__start = _start;
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__efistub__start_kernel = _start_kernel;
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__efistub__end = _end;
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__efistub__edata = _edata;
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__efistub___init_text_end = __init_text_end;
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__efistub_screen_info = screen_info;
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#endif
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@ -88,7 +88,7 @@ lib-$(CONFIG_EFI_GENERIC_STUB) += efi-stub.o string.o intrinsics.o systable.o \
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lib-$(CONFIG_ARM) += arm32-stub.o
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lib-$(CONFIG_ARM64) += kaslr.o arm64.o arm64-stub.o smbios.o
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lib-$(CONFIG_X86) += x86-stub.o
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lib-$(CONFIG_RISCV) += riscv.o riscv-stub.o
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lib-$(CONFIG_RISCV) += kaslr.o riscv.o riscv-stub.o
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lib-$(CONFIG_LOONGARCH) += loongarch.o loongarch-stub.o
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CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
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@ -30,32 +30,29 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
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efi_loaded_image_t *image,
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efi_handle_t image_handle)
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{
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unsigned long kernel_size = 0;
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unsigned long preferred_addr;
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unsigned long kernel_size, kernel_codesize, kernel_memsize;
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efi_status_t status;
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kernel_size = _edata - _start;
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kernel_codesize = __init_text_end - _start;
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kernel_memsize = kernel_size + (_end - _edata);
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*image_addr = (unsigned long)_start;
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*image_size = kernel_size + (_end - _edata);
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/*
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* RISC-V kernel maps PAGE_OFFSET virtual address to the same physical
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* address where kernel is booted. That's why kernel should boot from
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* as low as possible to avoid wastage of memory. Currently, dram_base
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* is occupied by the firmware. So the preferred address for kernel to
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* boot is next aligned address. If preferred address is not available,
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* relocate_kernel will fall back to efi_low_alloc_above to allocate
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* lowest possible memory region as long as the address and size meets
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* the alignment constraints.
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*/
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preferred_addr = EFI_KIMG_PREFERRED_ADDRESS;
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status = efi_relocate_kernel(image_addr, kernel_size, *image_size,
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preferred_addr, efi_get_kimg_min_align(),
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0x0);
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*image_size = kernel_memsize;
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*reserve_size = *image_size;
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status = efi_kaslr_relocate_kernel(image_addr,
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reserve_addr, reserve_size,
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kernel_size, kernel_codesize, kernel_memsize,
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efi_kaslr_get_phys_seed(image_handle));
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if (status != EFI_SUCCESS) {
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efi_err("Failed to relocate kernel\n");
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*image_size = 0;
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}
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return status;
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}
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void efi_icache_sync(unsigned long start, unsigned long end)
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{
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asm volatile ("fence.i" ::: "memory");
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}
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