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2007-06-28[POWERPC] Make more OF-related bootwrapper functions available to non-OF ↵David Gibson
platforms Commit 2e6016133755eb3cc44e8efab92573d23ed75888 split up arch/powerpc/boot/of.c so that some OF functions can be used on platforms that don't want to use the overall OF platform boot code. This is useful on things like PReP which can have an OF implementation which is useful for debugging output, but inadequate for booting. However, that commit didn't export quite enough things to make a usable OF console on a non-OF system. In particular, the device tree manipulation performed to initialize the OF console code must explicitly use the OF device tree, rather than the flattened device tree, even if the system is otherwise booting using a flattened device tree. This makes it so. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-06-14[POWERPC] Split low-level OF-related bootloader code into separate filesDavid Gibson
Currently, all OF-related code in the bootloader is contained in of.c. of.c also provides the platform specific things necessary to boot on an OF platform. However, there are platforms (such as PReP) which can include an OF implementation, but are not bootable as pure OF systems. For use by such platforms, this patch splits out the low-level parts of the OF code (call_prom() and various wrappers thereof) into a new oflib.c file. In addition, the code related to bootwrapper console output via OF are moved to a new ofconsole.c file. Both these files are included in the wrapper.a library where they can be used by both full-OF and partial OF platforms. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-04-24[POWERPC] bootwrapper: Use `unsigned long' for malloc sizesGeert Uytterhoeven
Use `unsigned long' for malloc sizes, to match common practice and types used by most callers and callees. Also use `unsigned long' for integers representing pointers in simple_alloc. Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@eu.sony.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-04-13[POWERPC] Fix detection of loader-supplied initrd on OF platformsPaul Mackerras
Commit 79c8541924a220964f9f2cbed31eaa9fdb042eab introduced code to move the initrd if it was in a place where it would get overwritten by the kernel image. Unfortunately this exposed the fact that the code that checks whether the values passed in r3 and r4 are intended to indicate the start address and size of an initrd image was not as thorough as the kernel's checks. The symptom is that on OF-based platforms, the bootwrapper can cause an exception which causes the system to drop back into OF. Previously it didn't matter so much if the code incorrectly thought that there was an initrd, since the values for start and size were just passed through to the kernel. Now the bootwrapper needs to apply the same checks as the kernel since it is now using the initrd data itself (in the process of copying it if necessary). This adds the code to do that. Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-03-26[POWERPC] bootwrapper: Add a fatal error helperMilton Miller
Add a macro fatal that calls printf then exit. User must include stdio.h. Typically replaces 3 lines with 1, although I added back some whitespace. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-03-13[POWERPC] zImage: Cleanup and improve zImage entry pointDavid Gibson
This patch re-organises the way the zImage wrapper code is entered, to allow more flexibility on platforms with unusual entry conditions. After this patch, a platform .o file has two options: 1) It can define a _zimage_start, in which case the platform code gets control from the very beginning of execution. In this case the platform code is responsible for relocating the zImage if necessary, clearing the BSS, performing any platform specific initialization, and finally calling start() to load and enter the kernel. 2) It can define platform_init(). In this case the generic crt0.S handles initial entry, and calls platform_init() before calling start(). The signature of platform_init() is changed, however, to take up to 5 parameters (in r3..r7) as they come from the platform's initial loader, instead of a fixed set of parameters based on OF's usage. When using the generic crt0.S, the platform .o can optionally supply a custom stack to use, using the BSS_STACK() macro. If this is not supplied, the crt0.S will assume that the loader has supplied a usable stack. In either case, the platform code communicates information to the generic code (specifically, a PROM pointer for OF systems, and/or an initrd image address supplied by the bootloader) via a global structure "loader_info". In addition the wrapper script is rearranged to ensure that the platform .o is always linked first. This means that platforms where the zImage entry point is at a fixed address or offset, rather than being encoded in the binary header can be supported using option (1). Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-03-13[POWERPC] zImage: Cleanup and improve prep_kernel()David Gibson
This patch rewrites prep_kernel() in the zImage wrapper code to be clearer and more flexible. Notable changes: - Handling of the initrd image from prep_kernel() has moved into a new prep_initrd() function. - The address of the initrd image is now added as device tree properties, as the kernel expects. - We only copy a packaged initrd image to a new location if it is in danger of being clobbered when the kernel moves to its final location, instead of always. - By default we decompress the kernel directly to address 0, instead of requiring it to relocate itself. Platforms (such as OF) where doing this could clobber still-live firmware data structures can override the vmlinux_alloc hook to provide an alternate place to decompress the kernel. - We no longer pass lots of information between functions in global variables. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-10-18[POWERPC] More bootwrapper reorganizationMark A. Greer
More reorganization of the bootwrapper: - Add dtb section to zImage - ft_init now called by platform_init - Pack a flat dt before calling kernel - Remove size parameter from free - printf only calls console_ops.write it its not NULL - Some cleanup Signed-off-by: Mark A. Greer <mgreer@mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-10-06[POWERPC] Fix zImage decompress locationBenjamin Herrenschmidt
The zImage wrapper has a "hack" that force the decompression to happen above 20Mb for 64 bits kernels, to work around issues with some firmwares on the field. However, the new wrapper has a bug which makes that hack not work properly. This fixes it. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-09-20[POWERPC] Start arch/powerpc/boot code reorganizationMark A. Greer
This abstracts the operations used in the bootwrapper, and defines the operations needed for the bootwrapper to run on an OF platform. The operations have been divided up into platform ops (platform_ops), firmware ops (fw_ops), device tree ops (dt_ops), and console ops (console_ops). The proper operations will be hooked up at runtime to provide the functionality that you need. Signed-off-by: Mark A. Greer <mgreer@mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>