[patch] memory commands

[Hollis Blanchard]

This patch adds a "memory" module, which currently contains two 
commands:
        Usage: memdump [address [len]]
        Dump the contents of memory.

        Usage: memset address (value [len] | trap)
        Write a 32-bit quantity to memory.

Future commands could include "memload" (load a file into memory) and 
"memsearch" (search for a given value or string in a specified area of 
memory. I haven't needed those yet.

The one tricky thing is that I added a "trap" shortcut. On PowerPC, and 
I assume on Sparc, when the processor hits a trap instruction while the 
firmware still owns the exception handlers, the firmware will provide 
helpful debug facilities (such as dumping the register state at the 
time of the trap). Inserting trap instructions has been very helpful to 
me for GRUB debugging (for example the OS X loader I've been working 
on). However, it may not make sense to have something like that on 
architectures like i386, which is why I made it depend on the 
HAVE_CPU_INSERT_TRAP define.

Comments?

-Hollis

2005-12-12  Hollis Blanchard  <address@hidden>

        * commands/memory.c: New file.
        * kern/powerpc/misc.c: Likewise.
        * include/grub/powerpc/misc.h: Likewise.
        * include/grub/i386/misc.h: Likewise.
        * include/grub/sparc64/misc.h: Likewise.
        * conf/common.rmk (pkgdata_MODULES): Add memory.mod.
        (memory_mod_SOURCES): New variable.
        (memory_mod_CFLAGS): Likewise.
        (memory_mod_LDFLAGS): Likewise.
        * conf/powerpc-ieee1275.rmk (grub_emu_SOURCES): Add
        kern/powerpc/misc.c.
        (grubof_SOURCES): Likewise.
        (grubof_HEADERS): Add cache.h and cpu/misc.h.
        * conf/i386-pc.rmk (kernel_img_HEADERS): Likewise.
        * conf/sparc64-ieee1275.rmk (grubof_HEADERS): Likewise.
        * include/grub/misc.h (grub_hexdump): New prototype.

hexdump.txt
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