linux/arch/sparc/prom
David S. Miller 25edd6946a sparc64: Get rid of indirect p1275 PROM call buffer.
This is based upon a report by Meelis Roos showing that it's possible
that we'll try to fetch a property that is 32K in size with some
devices.  With the current fixed 3K buffer we use for moving data in
and out of the firmware during PROM calls, that simply won't work.

In fact, it will scramble random kernel data during bootup.

The reasoning behind the temporary buffer is entirely historical.  It
used to be the case that we had problems referencing dynamic kernel
memory (including the stack) early in the boot process before we
explicitly told the firwmare to switch us over to the kernel trap
table.

So what we did was always give the firmware buffers that were locked
into the main kernel image.

But we no longer have problems like that, so get rid of all of this
indirect bounce buffering.

Besides fixing Meelis's bug, this also makes the kernel data about 3K
smaller.

It was also discovered during these conversions that the
implementation of prom_retain() was completely wrong, so that was
fixed here as well.  Currently that interface is not in use.

Reported-by: Meelis Roos <mroos@linux.ee>
Tested-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-08-23 23:10:57 -07:00
..
Makefile sparc: Use sparc64 version of prom/printf.c 2008-12-08 01:00:14 -08:00
bootstr_32.c sparc: prepare prom/ for unification 2008-12-04 09:17:16 -08:00
bootstr_64.c sparc,sparc64: unify prom/ 2008-12-04 09:17:17 -08:00
cif.S sparc64: Get rid of indirect p1275 PROM call buffer. 2010-08-23 23:10:57 -07:00
console_32.c sparc: remove redundant return statements 2010-02-10 11:47:57 -08:00
console_64.c sparc64: Get rid of indirect p1275 PROM call buffer. 2010-08-23 23:10:57 -07:00
devmap.c sparc: remove redundant return statements 2010-02-10 11:47:57 -08:00
devops_32.c sparc: remove redundant return statements 2010-02-10 11:47:57 -08:00
devops_64.c sparc64: Get rid of indirect p1275 PROM call buffer. 2010-08-23 23:10:57 -07:00
init_32.c sparc: remove redundant return statements 2010-02-10 11:47:57 -08:00
init_64.c sparc,sparc64: unify prom/ 2008-12-04 09:17:17 -08:00
memory.c sparc: remove CONFIG_SUN4 2008-08-31 20:59:37 -07:00
misc_32.c sparc: move EXPORT_SYMBOL to the symbols definition 2009-01-08 16:58:05 -08:00
misc_64.c sparc64: Get rid of indirect p1275 PROM call buffer. 2010-08-23 23:10:57 -07:00
mp.c sparc: remove CVS keywords 2008-05-20 00:33:44 -07:00
p1275.c sparc64: Get rid of indirect p1275 PROM call buffer. 2010-08-23 23:10:57 -07:00
palloc.c sparc: remove redundant return statements 2010-02-10 11:47:57 -08:00
printf.c sparc64: Fix bootup with mcount in some configs. 2009-09-04 03:39:45 -07:00
ranges.c sparc: remove redundant return statements 2010-02-10 11:47:57 -08:00
segment.c sparc: remove redundant return statements 2010-02-10 11:47:57 -08:00
tree_32.c sparc: remove redundant return statements 2010-02-10 11:47:57 -08:00
tree_64.c sparc64: Get rid of indirect p1275 PROM call buffer. 2010-08-23 23:10:57 -07:00