f1a116c055
The RISC-V build of the EFI stub is part of the core kernel image, and therefore accesses section markers directly when it needs to figure out the size of the various section. The zboot decompressor does not have access to those symbols, but doesn't really need that either. So let's move handle_kernel_image() into a separate file (or rather, move everything else into a separate file) so that the zboot build does not pull in unused code that links to symbols that it does not define. Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
61 lines
1.9 KiB
C
61 lines
1.9 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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#include <linux/efi.h>
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#include <asm/efi.h>
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#include <asm/sections.h>
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#include <asm/unaligned.h>
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#include "efistub.h"
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unsigned long stext_offset(void)
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{
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/*
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* When built as part of the kernel, the EFI stub cannot branch to the
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* kernel proper via the image header, as the PE/COFF header is
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* strictly not part of the in-memory presentation of the image, only
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* of the file representation. So instead, we need to jump to the
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* actual entrypoint in the .text region of the image.
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*/
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return _start_kernel - _start;
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}
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efi_status_t handle_kernel_image(unsigned long *image_addr,
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unsigned long *image_size,
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unsigned long *reserve_addr,
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unsigned long *reserve_size,
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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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efi_status_t status;
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kernel_size = _edata - _start;
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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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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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