diff options
| author | Christoph Hellwig <hch@lst.de> | 2021-09-16 10:04:05 +0300 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2021-09-24 14:35:07 +0300 |
| commit | 9fde0348640252c79d462c4d29a09a14e8741f5c (patch) | |
| tree | d4f9ba0894c1dd7701ae122d90b7dc227130501c /arch/m68k/include/asm/processor.h | |
| parent | 8ade83390930d61c64fe3ab49081990c9d43d0d2 (diff) | |
| download | linux-9fde0348640252c79d462c4d29a09a14e8741f5c.tar.xz | |
m68k: Remove set_fs()
Add a m68k-only set_fc helper to set the SFC and DFC registers for the
few places that need to override it for special MM operations, but
disconnect that from the deprecated kernel-wide set_fs() API.
Note that the SFC/DFC registers are context switched, so there is no need
to disable preemption.
Partially based on an earlier patch from
Linus Torvalds <torvalds@linux-foundation.org>.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Michael Schmitz <schmitzmic@gmail.com>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Link: https://lore.kernel.org/r/20210916070405.52750-7-hch@lst.de
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/include/asm/processor.h')
| -rw-r--r-- | arch/m68k/include/asm/processor.h | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/arch/m68k/include/asm/processor.h b/arch/m68k/include/asm/processor.h index 3750819ac5a1..f4d82c619a5c 100644 --- a/arch/m68k/include/asm/processor.h +++ b/arch/m68k/include/asm/processor.h @@ -9,7 +9,6 @@ #define __ASM_M68K_PROCESSOR_H #include <linux/thread_info.h> -#include <asm/segment.h> #include <asm/fpu.h> #include <asm/ptrace.h> @@ -75,11 +74,37 @@ static inline void wrusp(unsigned long usp) #define TASK_UNMAPPED_BASE 0 #endif +/* Address spaces (or Function Codes in Motorola lingo) */ +#define USER_DATA 1 +#define USER_PROGRAM 2 +#define SUPER_DATA 5 +#define SUPER_PROGRAM 6 +#define CPU_SPACE 7 + +#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES +/* + * Set the SFC/DFC registers for special MM operations. For most normal + * operation these remain set to USER_DATA for the uaccess routines. + */ +static inline void set_fc(unsigned long val) +{ + WARN_ON_ONCE(in_interrupt()); + + __asm__ __volatile__ ("movec %0,%/sfc\n\t" + "movec %0,%/dfc\n\t" + : /* no outputs */ : "r" (val) : "memory"); +} +#else +static inline void set_fc(unsigned long val) +{ +} +#endif /* CONFIG_CPU_HAS_ADDRESS_SPACES */ + struct thread_struct { unsigned long ksp; /* kernel stack pointer */ unsigned long usp; /* user stack pointer */ unsigned short sr; /* saved status register */ - unsigned short fs; /* saved fs (sfc, dfc) */ + unsigned short fc; /* saved fc (sfc, dfc) */ unsigned long crp[2]; /* cpu root pointer */ unsigned long esp0; /* points to SR of stack frame */ unsigned long faddr; /* info about last fault */ @@ -92,7 +117,7 @@ struct thread_struct { #define INIT_THREAD { \ .ksp = sizeof(init_stack) + (unsigned long) init_stack, \ .sr = PS_S, \ - .fs = __KERNEL_DS, \ + .fc = USER_DATA, \ } /* |