From: Kirill A. Shutemov Date: Wed, 6 Feb 2019 15:29:08 +0000 (+0300) Subject: x86/boot/compressed/64: Explain paging_prepare()'s return value X-Git-Tag: v5.15~6864^2~6 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=82434d23f36de42f70925f70d645ed3b1394361b;p=platform%2Fkernel%2Flinux-starfive.git x86/boot/compressed/64: Explain paging_prepare()'s return value paging_prepare() returns a two-quadword structure which lands into RDX:RAX: - Address of the trampoline is returned in RAX. - Non zero RDX means trampoline needs to enable 5-level paging. Document that explicitly. Signed-off-by: Kirill A. Shutemov Signed-off-by: Borislav Petkov Cc: dave.hansen@linux.intel.com Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Kyle D Pelton Cc: Thomas Gleixner Cc: Wei Huang Cc: x86-ml Link: https://lkml.kernel.org/r/20190206154756.matwldebbxkmlnae@black.fi.intel.com --- diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index b27b338..73b9d7e9 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -358,8 +358,11 @@ ENTRY(startup_64) * paging_prepare() sets up the trampoline and checks if we need to * enable 5-level paging. * - * Address of the trampoline is returned in RAX. - * Non zero RDX on return means we need to enable 5-level paging. + * paging_prepare() returns a two-quadword structure which lands + * into RDX:RAX: + * - Address of the trampoline is returned in RAX. + * - Non zero RDX means trampoline needs to enable 5-level + * paging. * * RSI holds real mode data and needs to be preserved across * this function call. @@ -565,7 +568,7 @@ adjust_got: * * RDI contains the return address (might be above 4G). * ECX contains the base address of the trampoline memory. - * Non zero RDX on return means we need to enable 5-level paging. + * Non zero RDX means trampoline needs to enable 5-level paging. */ ENTRY(trampoline_32bit_src) /* Set up data and stack segments */