Commit graph

14 commits

Author SHA1 Message Date
Wolfgang Denk
1a4596601f Add GPL-2.0+ SPDX-License-Identifier to source files
Signed-off-by: Wolfgang Denk <wd@denx.de>
[trini: Fixup common/cmd_io.c]
Signed-off-by: Tom Rini <trini@ti.com>
2013-07-24 09:44:38 -04:00
Simon Glass
0cecc3b679 x86: Set up the global data pointer in C instead of asm
We currently assume that the global data pointer is at the start of
struct global_data. We want to remove this restriction, and it is
easiest to do this in C.

Remove the asm code and add equivalent code in C.

This idea was proposed by Graeme Russ here:
   http://patchwork.ozlabs.org/patch/199741/

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Apply Graeme Russ' comments
http://patchwork.ozlabs.org/patch/206305/ here, re-order]
Signed-off-by: Tom Rini <trini@ti.com>
2013-02-01 15:36:53 -05:00
Gabe Black
91d82a29e7 x86: Add back cold- and warm-boot flags
These were removed, but actually are useful.

Cold means that we started from a reset/power on.
Warm means that we started from another U-Boot.

We determine whether u-boot on x86 was warm or cold booted (really if
it started at the beginning of the text segment or at the ELF entry point).
We plumb the result through to the global data structure.

Signed-off-by: Simon Glass <sjg@chromium.org>
2012-12-06 14:30:42 -08:00
Graeme Russ
8d61625d6a x86: Put global data on the stack
Putting global data on the stack simplifies the init process (and makes it
slightly quicker). During the 'flash' stage of the init sequence, global
data is in the CAR stack. After SDRAM is initialised, global data is copied
from CAR to the SDRAM stack

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
2012-11-28 11:40:03 -08:00
Graeme Russ
9e6c572ff0 x86: Use fs for global data
Use the base address of the 'F' segment as a pointer to the global data
structure. By adding the linear address (i.e. the 'D' segment address) as
the first word of the global data structure, the address of the global data
relative to the 'D' segment can be found simply, for example, by:

	fs movl 0, %eax

This makes the gd 'pointer' writable prior to relocation (by reloading the
Global Desctriptor Table) which brings x86 into line with all other arches

NOTE: Writing to the gd 'pointer' is expensive (but we only do it
twice) but using it to access global data members (read and write) is
still fairly cheap

--
Changes for v2:
 - Rebased against changes made to patch #3
 - Removed extra indent
 - Tweaked commit message
2012-01-04 22:17:24 +11:00
Graeme Russ
f48dd6fc6c x86: Simplify Flash-to-RAM code execution transition
Move the relocation offset calculation out of assembler and into C. This
also paves the way for the upcoming init sequence simplification by adding
the board_init_f_r flash to RAM transitional function

--
Changes for v2:
 - Added commit message
 - Minor adjustment to new stack address comment
2012-01-04 22:17:20 +11:00
Graeme Russ
109ad143f8 x86: Remove GDR related magic numbers
--
Changes for v2:
 - Use an enum
 - Add defined for GDT size (previously added in patch 7)
 - Use X86_ namespace (as per Linux headers)
2012-01-04 21:05:09 +11:00
Graeme Russ
2f0e0cd246 x86: Misc cleanups
Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2011-11-29 21:10:12 +11:00
Graeme Russ
a206cc2343 x86: Add multiboot header
By adding a multiboot header, U-Boot can be loaded by GRUB2. Using GRUB2 to
bootstrap U-Boot is useful for using an existing BIOS to get an initial
U-Boot port up and running before implementing the low-level reset vector
code, SDRAM init, etc. and overwriting the BIOS

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2011-11-29 21:08:02 +11:00
Graeme Russ
311b1a2b38 sc520: Create arch asm-offsets
Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2011-11-29 21:07:42 +11:00
Graeme Russ
facc9e7bf4 x86: Punt cold- and warm-boot flags
Nobody uses them anyway

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
2011-11-29 21:04:06 +11:00
Albert ARIBAUD
fa82f871c8 Convert ISO-8859 files to UTF-8
There was a mix of UTF-8 and ISO-8859 files in the U-Boot source
tree, which could cause issues with the patchwork review system.
This commit converts all ISO-8859 files to UTF-8.

Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
2011-08-04 23:34:02 +02:00
Mike Williams
1626308797 cleanup: Fix typos and misspellings in various files.
Recieve/Receive
recieve/receive
Interupt/Interrupt
interupt/interrupt
Addres/Address
addres/address

Signed-off-by: Mike Williams <mike@mikebwilliams.com>
2011-07-28 21:27:36 +02:00
Graeme Russ
fea2572001 x86: Rename i386 to x86
Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2011-04-13 19:43:28 +10:00
Renamed from arch/i386/cpu/start.S (Browse further)