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- .. SPDX-License-Identifier: GPL-2.0
- =======================
- Booting Linux/LoongArch
- =======================
- :Author: Yanteng Si <siyanteng@loongson.cn>
- :Date: 18 Nov 2022
- Information passed from BootLoader to kernel
- ============================================
- LoongArch supports ACPI and FDT. The information that needs to be passed
- to the kernel includes the memmap, the initrd, the command line, optionally
- the ACPI/FDT tables, and so on.
- The kernel is passed the following arguments on `kernel_entry` :
- - a0 = efi_boot: `efi_boot` is a flag indicating whether
- this boot environment is fully UEFI-compliant.
- - a1 = cmdline: `cmdline` is a pointer to the kernel command line.
- - a2 = systemtable: `systemtable` points to the EFI system table.
- All pointers involved at this stage are in physical addresses.
- Header of Linux/LoongArch kernel images
- =======================================
- Linux/LoongArch kernel images are EFI images. Being PE files, they have
- a 64-byte header structured like::
- u32 MZ_MAGIC /* "MZ", MS-DOS header */
- u32 res0 = 0 /* Reserved */
- u64 kernel_entry /* Kernel entry point */
- u64 _end - _text /* Kernel image effective size */
- u64 load_offset /* Kernel image load offset from start of RAM */
- u64 res1 = 0 /* Reserved */
- u64 res2 = 0 /* Reserved */
- u64 res3 = 0 /* Reserved */
- u32 LINUX_PE_MAGIC /* Magic number */
- u32 pe_header - _head /* Offset to the PE header */
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