On Sun, 22 Feb, at 07:43:48PM, Yinghai Lu wrote: > Index: linux-2.6/arch/x86/boot/header.S > =================================================================== > --- linux-2.6.orig/arch/x86/boot/header.S > +++ linux-2.6/arch/x86/boot/header.S > @@ -301,7 +301,7 @@ _start: > # Part 2 of the header, from the old setup.S > > .ascii "HdrS" # header signature > - .word 0x020d # header version number (>= 0x0105) > + .word 0x020e # header version number (>= 0x0105) > # or else old loadlin-1.5 will fail) > .globl realmode_swtch > realmode_swtch: .word 0, 0 # default_switch, SETUPSEG > @@ -449,6 +449,7 @@ pref_address: .quad LOAD_PHYSICAL_ADDR > #endif > init_size: .long INIT_SIZE # kernel initialization size > handover_offset: .long 0 # Filled in by build.c > +ext_code32_start: .long 0 # werid one! How about a comment like, "# Upper 32-bits of code32_start" ? > Index: linux-2.6/Documentation/x86/boot.txt > =================================================================== > --- linux-2.6.orig/Documentation/x86/boot.txt > +++ linux-2.6/Documentation/x86/boot.txt > @@ -61,6 +61,9 @@ Protocol 2.12: (Kernel 3.8) Added the xl > to struct boot_params for loading bzImage and ramdisk > above 4G in 64bit. > > +Protocol 2.14: (Kernel 3.20) Added the ext_code32_start to support 64bit > + EFI kernel to be loaded above 4G. > + > **** MEMORY LAYOUT > > The traditional memory map for the kernel loader, used for Image or > @@ -197,6 +200,7 @@ Offset Proto Name Meaning > 0258/8 2.10+ pref_address Preferred loading address > 0260/4 2.10+ init_size Linear memory required during initialization > 0264/4 2.11+ handover_offset Offset of handover entry point > +0268/4 2.14+ ext_code32_start Extended part for code32_start > > (1) For backwards compatibility, if the setup_sects field contains 0, the > real value is 4. > @@ -738,6 +742,14 @@ Offset/size: 0x264/4 > > See EFI HANDOVER PROTOCOL below for more details. > > +Field name: ext_code32_start > +Type: modify (optional, reloc) > +Offset/size: 0x268/4 > +Protocol: 2.14+ > + > + This field is the upper 32bits of load address when EFI 64bit kernel > + is loaded above 4G. And it is used with code32_start to compare to > + pref_address to decide if kernel need to be relocated further. I think we can delete the second sentence. But these are minimal changes and I'm happy to fix them up when applying this patch if that's OK? -- Matt Fleming, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
