From e08d703cc2ab6e47dbd10a74eb029f7dfa93d71d Mon Sep 17 00:00:00 2001 From: Greg Ungerer Date: Fri, 14 Oct 2011 14:43:30 +1000 Subject: m68k: modify user space access functions to support ColdFire CPUs Modify the user space access functions to support the ColdFire V4e cores running with MMU enabled. The ColdFire processors do not support the "moves" instruction used by the traditional 680x0 processors for moving data into and out of another address space. They only support the notion of a single address space, and you use the usual "move" instruction to access that. Create a new config symbol (CONFIG_CPU_HAS_ADDRESS_SPACES) to mark the CPU types that support separate address spaces, and thus also support the sfc/dfc registers and the "moves" instruction that go along with that. The code is almost identical for user space access, so lets just use a define to choose either the "move" or "moves" in the assembler code. Signed-off-by: Greg Ungerer Acked-by: Matt Waddel Acked-by: Kurt Mahan Acked-by: Geert Uytterhoeven --- arch/m68k/include/asm/segment.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/m68k/include/asm/segment.h') diff --git a/arch/m68k/include/asm/segment.h b/arch/m68k/include/asm/segment.h index ee959219fdf..1a142e9ceaa 100644 --- a/arch/m68k/include/asm/segment.h +++ b/arch/m68k/include/asm/segment.h @@ -31,7 +31,7 @@ typedef struct { static inline mm_segment_t get_fs(void) { -#ifdef CONFIG_MMU +#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES mm_segment_t _v; __asm__ ("movec %/dfc,%0":"=r" (_v.seg):); @@ -49,7 +49,7 @@ static inline mm_segment_t get_ds(void) static inline void set_fs(mm_segment_t val) { -#ifdef CONFIG_MMU +#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES __asm__ __volatile__ ("movec %0,%/sfc\n\t" "movec %0,%/dfc\n\t" : /* no outputs */ : "r" (val.seg) : "memory"); -- cgit v1.2.3-70-g09d2