From 2dac49cea06c4e0ab4000904e474b675d5e714bd Mon Sep 17 00:00:00 2001 From: Juergen Beisert Date: Tue, 12 Jan 2010 11:15:37 +0100 Subject: Adding x86 usage documentation to the tree Adding x86 usage documentation to the tree Signed-off-by: Juergen Beisert Signed-off-by: Sascha Hauer --- arch/architecture.dox | 1 + arch/x86/mach-x86.dox | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 129 insertions(+) create mode 100644 arch/x86/mach-x86.dox (limited to 'arch') diff --git a/arch/architecture.dox b/arch/architecture.dox index 669c028435..ea00dcdc89 100644 --- a/arch/architecture.dox +++ b/arch/architecture.dox @@ -88,6 +88,7 @@ TODO @li @subpage dev_bf_mach @li @subpage dev_ppc_mach @li @subpage dev_m68k_mach +@li @subpage dev_x86_mach */ diff --git a/arch/x86/mach-x86.dox b/arch/x86/mach-x86.dox new file mode 100644 index 0000000000..fc5b85a081 --- /dev/null +++ b/arch/x86/mach-x86.dox @@ -0,0 +1,128 @@ +/* This document is intended to provide the developer with information + * how to integrate a new CPU (MACH) into this part of the barebox tree + */ + +/** @page x86_runtime barebox on x86 at runtime + +@section mach_x86_memory_layout barebox's memory layout (BIOS based) + +@a barebox uses the following memory layout at runtime when it still depends +on some kind of BIOS function: + +@verbatim + Addresses +------------------------ + + seg:off flat + +xxxx:xxxx 0x01xxxxxx end of barebox's malloc area + . . +xxxx:xxxx 0x01000000 start of barebox's malloc area + . . + . . (used while loading a Linux kernel of type 'bzImage') + . . +xxxx:xxxx 0x00100000 start of extended memory and malloc area + . . + . . (the big hole) + . . +9000:ffff 0x0009ffff end of expected real mode memory + . . + . . (used while loading a Linux kernel of type 'bzImage') + . . +9000:0000 0x00090000 end of used lower real mode memory + . . + . . + . . Flat mode stack (about 32 kiB) + . . bss + . . Data + . . Text +0000:7e00 0x00007e00 Real and flat mode barebox code +0000:7c00 0x00007c00 MBR initial boot loader code +0000:7a00 0x00007a00 location of the indirect sector (while booting only) + below: real mode stack +@endverbatim + +@note The start address of 0x0000:7c000 is a fixed one, defined by the BIOS. +So, for a BIOS based @a barebox this address can't be changed. + +While the @a barebox code is runnung in flat mode, all interrupts are disabled. +But in the CPU only. All other interrupt settings are still valid. This is +required to be able to call real mode code from inside @a barebox flat mode +code. Thats why not the PIC is touched nor the IDT. + +@todo Add some notes about drive numbers used by the BIOS. They may change +if one change orders in the BIOS setup. Drive orders and numbers may be +different at BIOS runtime and Linux runtime! But these numbers are required +at BIOS runtime for booting and the persistant environment storage. + +@attention Currently there is a 4 GiB limit for the disk sizes! + +@section mach_x86_image_layout barebox's image layout + +@a barebox's binary image layout + +@verbatim + Offset Content + + 0x????? + . 32 bit barebox code + . + . 16 bit bootstrap code, BIOS calling code + 0x00400 + 0x003ff + . indirect sector + 0x00200 + 0x001ff + . MBR + 0x00000 +@endverbatim + +The "indirect sector" is a free area in the image where the sector information +gets stored when this image will be written to a boot media. This information +is required to load all parts of the image from the boot media at runtime. + +The image gets installed in two ways onto the boot media, depending on the +need for a persistant storage. + +@subsection mach_x86_drive_layout_wops barebox's boot media layout without persistant storage + +In this case @a barebox's persistant storage is anywhere: + +@verbatim + Sector Content +--------------------------- + X start of first partition + . + ? end of the binary image + . 32 bit barebox code + 2 16 bit bootstrap code, BIOS calling code + 1 indirect sector + 0 MBR, Partition table, boot code +@endverbatim + +@subsection mach_x86_drive_layout_wps barebox's boot media layout with persistant storage + +@a barebox's persistant storage is part of the boot media (more +space required in front of the first partition) and interferes with the +boot loader image itself: + +@verbatim + Sector Content +--------------------------- + X start of first partition + . + n+? end of the binary image + . 32 bit barebox code + n+2 16 bit bootstrap code, BIOS calling code + n+1 indirect sector + n end of persistant environment storage + . + 1 start of persistant environment storage + 0 MBR, Partition table, boot code +@endverbatim + +The information where the persistant storage is located is also stored into +the MBR at specific locations by @p setupmbr. The @a barebox runtime will use +it to load and store all environment relevant data. + +*/ -- cgit v1.2.3