125 lines
4.0 KiB
C
125 lines
4.0 KiB
C
/*
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* Copyright (C) 2020 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <types.h>
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#include <errno.h>
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#include <multiboot.h>
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#include <asm/pgtable.h>
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#include "multiboot_priv.h"
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/**
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* @pre mbi != NULL && mb2_tag_mmap != NULL
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*/
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static void mb2_mmap_to_mbi(struct acrn_multiboot_info *mbi, const struct multiboot2_tag_mmap *mb2_tag_mmap)
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{
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/* multiboot2 mmap tag header occupied 16 bytes */
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mbi->mi_mmap_entries = (mb2_tag_mmap->size - 16U) / sizeof(struct multiboot2_mmap_entry);
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mbi->mi_mmap_va = (struct multiboot2_mmap_entry *)mb2_tag_mmap->entries;
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}
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/**
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* @pre mbi != NULL && mb2_tag_mods != NULL
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*/
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static void mb2_mods_to_mbi(struct acrn_multiboot_info *mbi,
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uint32_t mbi_mod_idx, const struct multiboot2_tag_module *mb2_tag_mods)
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{
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if (mbi_mod_idx < MAX_MODULE_NUM) {
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mbi->mi_mods[mbi_mod_idx].mm_mod_start = mb2_tag_mods->mod_start;
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mbi->mi_mods[mbi_mod_idx].mm_mod_end = mb2_tag_mods->mod_end;
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mbi->mi_mods[mbi_mod_idx].mm_string = (uint32_t)(uint64_t)mb2_tag_mods->cmdline;
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}
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}
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/**
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* @pre mbi != NULL && mb2_tag_efi64 != 0
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*/
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static void mb2_efi64_to_mbi(struct acrn_multiboot_info *mbi, const struct multiboot2_tag_efi64 *mb2_tag_efi64)
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{
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const uint32_t efiloader_sig = 0x34364c45; /* "EL64" */
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mbi->mi_efi_info.efi_systab = (uint32_t)(uint64_t)mb2_tag_efi64->pointer;
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mbi->mi_efi_info.efi_loader_signature = efiloader_sig;
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mbi->mi_flags |= MULTIBOOT_INFO_HAS_EFI64;
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}
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/**
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* @pre mbi != NULL && mb2_tag_efimmap != 0
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*/
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static void mb2_efimmap_to_mbi(struct acrn_multiboot_info *mbi,
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const struct multiboot2_tag_efi_mmap *mb2_tag_efimmap)
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{
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mbi->mi_efi_info.efi_memdesc_size = mb2_tag_efimmap->descr_size;
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mbi->mi_efi_info.efi_memdesc_version = mb2_tag_efimmap->descr_vers;
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mbi->mi_efi_info.efi_memmap = (uint32_t)(uint64_t)mb2_tag_efimmap->efi_mmap;
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mbi->mi_efi_info.efi_memmap_size = mb2_tag_efimmap->size - 16U;
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mbi->mi_efi_info.efi_memmap_hi = (uint32_t)(((uint64_t)mb2_tag_efimmap->efi_mmap) >> 32U);
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mbi->mi_flags |= MULTIBOOT_INFO_HAS_EFI_MMAP;
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}
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/**
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* @pre mbi != NULL
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*/
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int32_t multiboot2_to_acrn_mbi(struct acrn_multiboot_info *mbi, void *mb2_info)
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{
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int32_t ret = 0;
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struct multiboot2_tag *mb2_tag, *mb2_tag_end;
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uint32_t mb2_info_size = *(uint32_t *)mb2_info;
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uint32_t mod_idx = 0U;
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/* The start part of multiboot2 info: total mbi size (4 bytes), reserved (4 bytes) */
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mb2_tag = (struct multiboot2_tag *)((uint8_t *)mb2_info + 8U);
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mb2_tag_end = (struct multiboot2_tag *)((uint8_t *)mb2_info + mb2_info_size);
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while ((mb2_tag->type != MULTIBOOT2_TAG_TYPE_END) && (mb2_tag < mb2_tag_end)) {
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switch (mb2_tag->type) {
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case MULTIBOOT2_TAG_TYPE_CMDLINE:
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mbi->mi_cmdline = ((struct multiboot2_tag_string *)mb2_tag)->string;
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mbi->mi_flags |= MULTIBOOT_INFO_HAS_CMDLINE;
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break;
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case MULTIBOOT2_TAG_TYPE_MMAP:
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mb2_mmap_to_mbi(mbi, (const struct multiboot2_tag_mmap *)mb2_tag);
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break;
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case MULTIBOOT2_TAG_TYPE_MODULE:
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mb2_mods_to_mbi(mbi, mod_idx, (const struct multiboot2_tag_module *)mb2_tag);
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mod_idx++;
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break;
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case MULTIBOOT2_TAG_TYPE_BOOT_LOADER_NAME:
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mbi->mi_loader_name = ((struct multiboot2_tag_string *)mb2_tag)->string;
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break;
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case MULTIBOOT2_TAG_TYPE_ACPI_NEW:
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mbi->mi_acpi_rsdp_va = ((struct multiboot2_tag_new_acpi *)mb2_tag)->rsdp;
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break;
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case MULTIBOOT2_TAG_TYPE_EFI64:
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mb2_efi64_to_mbi(mbi, (const struct multiboot2_tag_efi64 *)mb2_tag);
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break;
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case MULTIBOOT2_TAG_TYPE_EFI_MMAP:
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mb2_efimmap_to_mbi(mbi, (const struct multiboot2_tag_efi_mmap *)mb2_tag);
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break;
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default:
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if (mb2_tag->type > MULTIBOOT2_TAG_TYPE_LOAD_BASE_ADDR) {
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ret = -EINVAL;
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}
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break;
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}
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if (mb2_tag->size == 0U) {
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ret = -EINVAL;
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}
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if (ret != 0) {
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break;
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}
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/*
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* tag->size does not include padding whearas each tag
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* start at 8-bytes aligned address.
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*/
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mb2_tag = (struct multiboot2_tag *)((uint8_t *)mb2_tag
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+ ((mb2_tag->size + (MULTIBOOT2_INFO_ALIGN - 1U)) & ~(MULTIBOOT2_INFO_ALIGN - 1U)));
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}
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mbi->mi_mods_count = mod_idx;
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return ret;
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}
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