64-bit mode has no segment/GDT requirements as it does not really use segment registers. The entry code loads null descriptors into the data and stack segment registers. Signed-off-by: Arvind Sankar <nivedita@xxxxxxxxxxxx> --- Documentation/x86/boot.rst | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/Documentation/x86/boot.rst b/Documentation/x86/boot.rst index 3e13b7d57271..df2bf8abbbc1 100644 --- a/Documentation/x86/boot.rst +++ b/Documentation/x86/boot.rst @@ -1396,12 +1396,9 @@ In 64-bit boot protocol, the kernel is started by jumping to the At entry, the CPU must be in 64-bit mode with paging enabled. The range with setup_header.init_size from start address of loaded kernel and zero page and command line buffer get ident mapping; -a GDT must be loaded with the descriptors for selectors -__BOOT_CS(0x10) and __BOOT_DS(0x18); both descriptors must be 4G flat -segment; __BOOT_CS must have execute/read permission, and __BOOT_DS -must have read/write permission; CS must be __BOOT_CS and DS, ES, SS -must be __BOOT_DS; interrupt must be disabled; %rsi must hold the base -address of the struct boot_params. +interrupt must be disabled; %rsi must hold the base address of the +struct boot_params. As 64-bit mode does not really use segments, there +are no special requirements on the segment registers or descriptors. EFI Handover Protocol ===================== -- 2.24.1
