/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /* * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * Copyright (C) 2015 Kay Sievers <kay@vrfy.org> */ #include <efi.h> #include <efilib.h> #include "util.h" #include "linux.h" #define SETUP_MAGIC 0x53726448 /* "HdrS" */ struct SetupHeader { UINT8 boot_sector[0x01f1]; UINT8 setup_secs; UINT16 root_flags; UINT32 sys_size; UINT16 ram_size; UINT16 video_mode; UINT16 root_dev; UINT16 signature; UINT16 jump; UINT32 header; UINT16 version; UINT16 su_switch; UINT16 setup_seg; UINT16 start_sys; UINT16 kernel_ver; UINT8 loader_id; UINT8 load_flags; UINT16 movesize; UINT32 code32_start; UINT32 ramdisk_start; UINT32 ramdisk_len; UINT32 bootsect_kludge; UINT16 heap_end; UINT8 ext_loader_ver; UINT8 ext_loader_type; UINT32 cmd_line_ptr; UINT32 ramdisk_max; UINT32 kernel_alignment; UINT8 relocatable_kernel; UINT8 min_alignment; UINT16 xloadflags; UINT32 cmdline_size; UINT32 hardware_subarch; UINT64 hardware_subarch_data; UINT32 payload_offset; UINT32 payload_length; UINT64 setup_data; UINT64 pref_address; UINT32 init_size; UINT32 handover_offset; } __attribute__((packed)); #ifdef __x86_64__ typedef VOID(*handover_f)(VOID *image, EFI_SYSTEM_TABLE *table, struct SetupHeader *setup); static inline VOID linux_efi_handover(EFI_HANDLE image, struct SetupHeader *setup) { handover_f handover; asm volatile ("cli"); handover = (handover_f)((UINTN)setup->code32_start + 512 + setup->handover_offset); handover(image, ST, setup); } #else typedef VOID(*handover_f)(VOID *image, EFI_SYSTEM_TABLE *table, struct SetupHeader *setup) __attribute__((regparm(0))); static inline VOID linux_efi_handover(EFI_HANDLE image, struct SetupHeader *setup) { handover_f handover; handover = (handover_f)((UINTN)setup->code32_start + setup->handover_offset); handover(image, ST, setup); } #endif EFI_STATUS linux_exec(EFI_HANDLE *image, CHAR8 *cmdline, UINTN cmdline_len, UINTN linux_addr, UINTN initrd_addr, UINTN initrd_size) { struct SetupHeader *image_setup; struct SetupHeader *boot_setup; EFI_PHYSICAL_ADDRESS addr; EFI_STATUS err; image_setup = (struct SetupHeader *)(linux_addr); if (image_setup->signature != 0xAA55 || image_setup->header != SETUP_MAGIC) return EFI_LOAD_ERROR; if (image_setup->version < 0x20b || !image_setup->relocatable_kernel) return EFI_LOAD_ERROR; addr = 0x3fffffff; err = uefi_call_wrapper(BS->AllocatePages, 4, AllocateMaxAddress, EfiLoaderData, EFI_SIZE_TO_PAGES(0x4000), &addr); if (EFI_ERROR(err)) return err; boot_setup = (struct SetupHeader *)(UINTN)addr; ZeroMem(boot_setup, 0x4000); CopyMem(boot_setup, image_setup, sizeof(struct SetupHeader)); boot_setup->loader_id = 0xff; boot_setup->code32_start = (UINT32)linux_addr + (image_setup->setup_secs+1) * 512; if (cmdline) { addr = 0xA0000; err = uefi_call_wrapper(BS->AllocatePages, 4, AllocateMaxAddress, EfiLoaderData, EFI_SIZE_TO_PAGES(cmdline_len + 1), &addr); if (EFI_ERROR(err)) return err; CopyMem((VOID *)(UINTN)addr, cmdline, cmdline_len); ((CHAR8 *)addr)[cmdline_len] = 0; boot_setup->cmd_line_ptr = (UINT32)addr; } boot_setup->ramdisk_start = (UINT32)initrd_addr; boot_setup->ramdisk_len = (UINT32)initrd_size; linux_efi_handover(image, boot_setup); return EFI_LOAD_ERROR; }