From 2cb7e0aaedad73b076ea18c6900b0e86c5760d79 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 15:00:47 +0200 Subject: Adding upstream version 247.3. Signed-off-by: Daniel Baumann --- src/boot/efi/linux.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 src/boot/efi/linux.c (limited to 'src/boot/efi/linux.c') diff --git a/src/boot/efi/linux.c b/src/boot/efi/linux.c new file mode 100644 index 0000000..4d44671 --- /dev/null +++ b/src/boot/efi/linux.c @@ -0,0 +1,74 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include +#include + +#include "linux.h" +#include "util.h" + +#ifdef __i386__ +#define __regparm0__ __attribute__((regparm(0))) +#else +#define __regparm0__ +#endif + +typedef VOID(*handover_f)(VOID *image, EFI_SYSTEM_TABLE *table, struct boot_params *params) __regparm0__; +static VOID linux_efi_handover(EFI_HANDLE image, struct boot_params *params) { + handover_f handover; + UINTN start = (UINTN)params->hdr.code32_start; + +#ifdef __x86_64__ + asm volatile ("cli"); + start += 512; +#endif + handover = (handover_f)(start + params->hdr.handover_offset); + handover(image, ST, params); +} + +EFI_STATUS linux_exec(EFI_HANDLE *image, + CHAR8 *cmdline, UINTN cmdline_len, + UINTN linux_addr, + UINTN initrd_addr, UINTN initrd_size) { + struct boot_params *image_params; + struct boot_params *boot_params; + UINT8 setup_sectors; + EFI_PHYSICAL_ADDRESS addr; + EFI_STATUS err; + + image_params = (struct boot_params *) linux_addr; + + if (image_params->hdr.boot_flag != 0xAA55 || + image_params->hdr.header != SETUP_MAGIC || + image_params->hdr.version < 0x20b || + !image_params->hdr.relocatable_kernel) + return EFI_LOAD_ERROR; + + boot_params = (struct boot_params *) 0xFFFFFFFF; + err = uefi_call_wrapper(BS->AllocatePages, 4, AllocateMaxAddress, EfiLoaderData, + EFI_SIZE_TO_PAGES(0x4000), (EFI_PHYSICAL_ADDRESS*) &boot_params); + if (EFI_ERROR(err)) + return err; + + ZeroMem(boot_params, 0x4000); + CopyMem(&boot_params->hdr, &image_params->hdr, sizeof(struct setup_header)); + boot_params->hdr.type_of_loader = 0xff; + setup_sectors = image_params->hdr.setup_sects > 0 ? image_params->hdr.setup_sects : 4; + boot_params->hdr.code32_start = (UINT32)linux_addr + (setup_sectors + 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 *)(UINTN)addr)[cmdline_len] = 0; + boot_params->hdr.cmd_line_ptr = (UINT32)addr; + } + + boot_params->hdr.ramdisk_image = (UINT32)initrd_addr; + boot_params->hdr.ramdisk_size = (UINT32)initrd_size; + + linux_efi_handover(image, boot_params); + return EFI_LOAD_ERROR; +} -- cgit v1.2.3