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m68knommu: add ffs and __ffs plattform which support ISA A+ or ISA C 

the ff1 and bitrev opcode appears in ISA C and ISA A+ what isn't
supported by all plattforms. The assembly optimization is automaticly
enabled if the compiler understand the required cpu keyword.
My m5235 seems to boot and run fine so far.

Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
This commit is contained in:
Sebastian Siewior 2008-05-09 16:10:37 +02:00 committed by Greg Ungerer
parent 5bed10a5ee
commit a6260ef841
2 changed files with 37 additions and 4 deletions
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11
arch/m68knommu/Makefile
View File

@ -8,6 +8,8 @@
# (C) Copyright 2002, Greg Ungerer <gerg@snapgear.com>
#
KBUILD_DEFCONFIG := m5208evb_defconfig
platform-$(CONFIG_M68328) := 68328
platform-$(CONFIG_M68EZ328) := 68EZ328
platform-$(CONFIG_M68VZ328) := 68VZ328
@ -90,13 +92,14 @@ export PLATFORM BOARD MODEL CPUCLASS
cflags-$(CONFIG_M5206) := -m5200
cflags-$(CONFIG_M5206e) := -m5200
cflags-$(CONFIG_M520x) := -m5307
cflags-$(CONFIG_M523x) := -m5307
cflags-$(CONFIG_M523x) := $(call cc-option,-mcpu=523x,-m5307)
cflags-$(CONFIG_M5249) := -m5200
cflags-$(CONFIG_M527x) := -m5307
cflags-$(CONFIG_M5271) := $(call cc-option,-mcpu=5271,-m5307)
cflags-$(CONFIG_M5272) := -m5307
cflags-$(CONFIG_M528x) := -m5307
cflags-$(CONFIG_M5275) := $(call cc-option,-mcpu=5275,-m5307)
cflags-$(CONFIG_M528x) := $(call cc-option,-m528x,-m5307)
cflags-$(CONFIG_M5307) := -m5307
cflags-$(CONFIG_M532x) := -m5307
cflags-$(CONFIG_M532x) := $(call cc-option,-mcpu=532x,-m5307)
cflags-$(CONFIG_M5407) := -m5200
cflags-$(CONFIG_M68328) := -m68000
cflags-$(CONFIG_M68EZ328) := -m68000

30
include/asm-m68knommu/bitops.h
View File

@ -14,8 +14,38 @@
#error only <linux/bitops.h> can be included directly
#endif
#if defined (__mcfisaaplus__) || defined (__mcfisac__)
static inline int ffs(unsigned int val)
{
if (!val)
return 0;
asm volatile(
"bitrev %0\n\t"
"ff1 %0\n\t"
: "=d" (val)
: "0" (val)
);
val++;
return val;
}
static inline int __ffs(unsigned int val)
{
asm volatile(
"bitrev %0\n\t"
"ff1 %0\n\t"
: "=d" (val)
: "0" (val)
);
return val;
}
#else
#include <asm-generic/bitops/ffs.h>
#include <asm-generic/bitops/__ffs.h>
#endif
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/ffz.h>