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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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f48485ab50
Currently only MIPS firmware processors use ELF-formatted firmware. When adding support for RISC-V firmware processors, it will be useful to have ELF handling functions ready to go. Reviewed-by: Frank Binns <frank.binns@imgtec.com> Link: https://lore.kernel.org/r/20250410-sets-bxs-4-64-patch-v1-v6-13-eda620c5865f@imgtec.com Signed-off-by: Matt Coster <matt.coster@imgtec.com>
67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only OR MIT
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/* Copyright (c) 2024 Imagination Technologies Ltd. */
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#include "pvr_device.h"
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#include "pvr_fw.h"
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#include <drm/drm_device.h>
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#include <drm/drm_print.h>
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#include <linux/elf.h>
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#include <linux/string.h>
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#include <linux/types.h>
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/**
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* pvr_fw_process_elf_command_stream() - Process ELF firmware image and populate
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* firmware sections
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* @pvr_dev: Device pointer.
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* @fw: Pointer to firmware image.
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* @fw_code_ptr: Pointer to FW code section.
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* @fw_data_ptr: Pointer to FW data section.
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* @fw_core_code_ptr: Pointer to FW coremem code section.
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* @fw_core_data_ptr: Pointer to FW coremem data section.
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*
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* Returns :
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* * 0 on success, or
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* * -EINVAL on any error in ELF command stream.
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*/
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int
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pvr_fw_process_elf_command_stream(struct pvr_device *pvr_dev, const u8 *fw,
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u8 *fw_code_ptr, u8 *fw_data_ptr,
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u8 *fw_core_code_ptr, u8 *fw_core_data_ptr)
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{
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struct elf32_hdr *header = (struct elf32_hdr *)fw;
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struct elf32_phdr *program_header = (struct elf32_phdr *)(fw + header->e_phoff);
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struct drm_device *drm_dev = from_pvr_device(pvr_dev);
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int err;
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for (u32 entry = 0; entry < header->e_phnum; entry++, program_header++) {
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void *write_addr;
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/* Only consider loadable entries in the ELF segment table */
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if (program_header->p_type != PT_LOAD)
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continue;
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err = pvr_fw_find_mmu_segment(pvr_dev, program_header->p_vaddr,
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program_header->p_memsz, fw_code_ptr, fw_data_ptr,
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fw_core_code_ptr, fw_core_data_ptr, &write_addr);
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if (err) {
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drm_err(drm_dev,
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"Addr 0x%x (size: %d) not found in any firmware segment",
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program_header->p_vaddr, program_header->p_memsz);
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return err;
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}
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/* Write to FW allocation only if available */
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if (write_addr) {
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memcpy(write_addr, fw + program_header->p_offset,
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program_header->p_filesz);
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memset((u8 *)write_addr + program_header->p_filesz, 0,
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program_header->p_memsz - program_header->p_filesz);
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}
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}
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return 0;
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}
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