mirror of
https://github.com/AsahiLinux/u-boot
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cafe8712e8
We want to use VBE to mean Verfiied Boot for Embedded in U-Boot. Rename the existing VBE (Vesa BIOS extensions) to allow this. Verified Boot for Embedded is documented doc/develop/vbe.rst Signed-off-by: Simon Glass <sjg@chromium.org>
246 lines
6.8 KiB
C
246 lines
6.8 KiB
C
// SPDX-License-Identifier: BSD-2-Clause
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/*
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Copyright (c) 2001 William L. Pitts
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*/
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#include <common.h>
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#include <command.h>
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#include <cpu_func.h>
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#include <elf.h>
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#include <env.h>
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#include <net.h>
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#include <vxworks.h>
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#ifdef CONFIG_X86
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#include <vesa.h>
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#include <asm/e820.h>
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#include <linux/linkage.h>
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#endif
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/*
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* A very simple ELF64 loader, assumes the image is valid, returns the
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* entry point address.
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*
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* Note if U-Boot is 32-bit, the loader assumes the to segment's
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* physical address and size is within the lower 32-bit address space.
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*/
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unsigned long load_elf64_image_phdr(unsigned long addr)
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{
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Elf64_Ehdr *ehdr; /* Elf header structure pointer */
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Elf64_Phdr *phdr; /* Program header structure pointer */
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int i;
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ehdr = (Elf64_Ehdr *)addr;
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phdr = (Elf64_Phdr *)(addr + (ulong)ehdr->e_phoff);
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/* Load each program header */
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for (i = 0; i < ehdr->e_phnum; ++i) {
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void *dst = (void *)(ulong)phdr->p_paddr;
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void *src = (void *)addr + phdr->p_offset;
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debug("Loading phdr %i to 0x%p (%lu bytes)\n",
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i, dst, (ulong)phdr->p_filesz);
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if (phdr->p_filesz)
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memcpy(dst, src, phdr->p_filesz);
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if (phdr->p_filesz != phdr->p_memsz)
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memset(dst + phdr->p_filesz, 0x00,
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phdr->p_memsz - phdr->p_filesz);
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flush_cache(rounddown((unsigned long)dst, ARCH_DMA_MINALIGN),
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roundup(phdr->p_memsz, ARCH_DMA_MINALIGN));
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++phdr;
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}
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if (ehdr->e_machine == EM_PPC64 && (ehdr->e_flags &
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EF_PPC64_ELFV1_ABI)) {
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/*
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* For the 64-bit PowerPC ELF V1 ABI, e_entry is a function
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* descriptor pointer with the first double word being the
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* address of the entry point of the function.
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*/
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uintptr_t addr = ehdr->e_entry;
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return *(Elf64_Addr *)addr;
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}
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return ehdr->e_entry;
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}
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unsigned long load_elf64_image_shdr(unsigned long addr)
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{
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Elf64_Ehdr *ehdr; /* Elf header structure pointer */
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Elf64_Shdr *shdr; /* Section header structure pointer */
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unsigned char *strtab = 0; /* String table pointer */
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unsigned char *image; /* Binary image pointer */
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int i; /* Loop counter */
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ehdr = (Elf64_Ehdr *)addr;
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/* Find the section header string table for output info */
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shdr = (Elf64_Shdr *)(addr + (ulong)ehdr->e_shoff +
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(ehdr->e_shstrndx * sizeof(Elf64_Shdr)));
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if (shdr->sh_type == SHT_STRTAB)
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strtab = (unsigned char *)(addr + (ulong)shdr->sh_offset);
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/* Load each appropriate section */
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for (i = 0; i < ehdr->e_shnum; ++i) {
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shdr = (Elf64_Shdr *)(addr + (ulong)ehdr->e_shoff +
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(i * sizeof(Elf64_Shdr)));
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if (!(shdr->sh_flags & SHF_ALLOC) ||
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shdr->sh_addr == 0 || shdr->sh_size == 0) {
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continue;
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}
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if (strtab) {
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debug("%sing %s @ 0x%08lx (%ld bytes)\n",
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(shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
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&strtab[shdr->sh_name],
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(unsigned long)shdr->sh_addr,
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(long)shdr->sh_size);
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}
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if (shdr->sh_type == SHT_NOBITS) {
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memset((void *)(uintptr_t)shdr->sh_addr, 0,
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shdr->sh_size);
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} else {
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image = (unsigned char *)addr + (ulong)shdr->sh_offset;
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memcpy((void *)(uintptr_t)shdr->sh_addr,
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(const void *)image, shdr->sh_size);
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}
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flush_cache(rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN),
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roundup((shdr->sh_addr + shdr->sh_size),
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ARCH_DMA_MINALIGN) -
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rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN));
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}
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if (ehdr->e_machine == EM_PPC64 && (ehdr->e_flags &
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EF_PPC64_ELFV1_ABI)) {
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/*
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* For the 64-bit PowerPC ELF V1 ABI, e_entry is a function
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* descriptor pointer with the first double word being the
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* address of the entry point of the function.
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*/
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uintptr_t addr = ehdr->e_entry;
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return *(Elf64_Addr *)addr;
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}
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return ehdr->e_entry;
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}
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/*
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* A very simple ELF loader, assumes the image is valid, returns the
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* entry point address.
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*
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* The loader firstly reads the EFI class to see if it's a 64-bit image.
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* If yes, call the ELF64 loader. Otherwise continue with the ELF32 loader.
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*/
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unsigned long load_elf_image_phdr(unsigned long addr)
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{
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Elf32_Ehdr *ehdr; /* Elf header structure pointer */
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Elf32_Phdr *phdr; /* Program header structure pointer */
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int i;
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ehdr = (Elf32_Ehdr *)addr;
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if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
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return load_elf64_image_phdr(addr);
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phdr = (Elf32_Phdr *)(addr + ehdr->e_phoff);
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/* Load each program header */
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for (i = 0; i < ehdr->e_phnum; ++i) {
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void *dst = (void *)(uintptr_t)phdr->p_paddr;
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void *src = (void *)addr + phdr->p_offset;
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debug("Loading phdr %i to 0x%p (%i bytes)\n",
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i, dst, phdr->p_filesz);
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if (phdr->p_filesz)
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memcpy(dst, src, phdr->p_filesz);
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if (phdr->p_filesz != phdr->p_memsz)
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memset(dst + phdr->p_filesz, 0x00,
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phdr->p_memsz - phdr->p_filesz);
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flush_cache(rounddown((unsigned long)dst, ARCH_DMA_MINALIGN),
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roundup(phdr->p_memsz, ARCH_DMA_MINALIGN));
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++phdr;
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}
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return ehdr->e_entry;
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}
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unsigned long load_elf_image_shdr(unsigned long addr)
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{
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Elf32_Ehdr *ehdr; /* Elf header structure pointer */
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Elf32_Shdr *shdr; /* Section header structure pointer */
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unsigned char *strtab = 0; /* String table pointer */
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unsigned char *image; /* Binary image pointer */
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int i; /* Loop counter */
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ehdr = (Elf32_Ehdr *)addr;
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if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
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return load_elf64_image_shdr(addr);
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/* Find the section header string table for output info */
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shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
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(ehdr->e_shstrndx * sizeof(Elf32_Shdr)));
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if (shdr->sh_type == SHT_STRTAB)
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strtab = (unsigned char *)(addr + shdr->sh_offset);
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/* Load each appropriate section */
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for (i = 0; i < ehdr->e_shnum; ++i) {
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shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
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(i * sizeof(Elf32_Shdr)));
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if (!(shdr->sh_flags & SHF_ALLOC) ||
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shdr->sh_addr == 0 || shdr->sh_size == 0) {
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continue;
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}
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if (strtab) {
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debug("%sing %s @ 0x%08lx (%ld bytes)\n",
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(shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
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&strtab[shdr->sh_name],
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(unsigned long)shdr->sh_addr,
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(long)shdr->sh_size);
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}
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if (shdr->sh_type == SHT_NOBITS) {
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memset((void *)(uintptr_t)shdr->sh_addr, 0,
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shdr->sh_size);
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} else {
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image = (unsigned char *)addr + shdr->sh_offset;
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memcpy((void *)(uintptr_t)shdr->sh_addr,
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(const void *)image, shdr->sh_size);
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}
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flush_cache(rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN),
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roundup((shdr->sh_addr + shdr->sh_size),
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ARCH_DMA_MINALIGN) -
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rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN));
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}
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return ehdr->e_entry;
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}
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/*
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* Determine if a valid ELF image exists at the given memory location.
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* First look at the ELF header magic field, then make sure that it is
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* executable.
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*/
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int valid_elf_image(unsigned long addr)
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{
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Elf32_Ehdr *ehdr; /* Elf header structure pointer */
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ehdr = (Elf32_Ehdr *)addr;
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if (!IS_ELF(*ehdr)) {
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printf("## No elf image at address 0x%08lx\n", addr);
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return 0;
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}
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if (ehdr->e_type != ET_EXEC) {
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printf("## Not a 32-bit elf image at address 0x%08lx\n", addr);
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return 0;
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}
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return 1;
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}
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