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s390/entry: add assembler macro to conveniently tests under mask

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Various functions in entry.S perform test-under-mask instructions
to test for particular bits in memory.  Because test-under-mask uses
a mask value of one byte, the mask value and the offset into the
memory must be calculated manually.  This easily introduces errors
and is hard to review and read.

Introduce the TSTMSK assembler macro to specify a mask constant and
let the macro calculate the offset and the byte mask to generate a
test-under-mask instruction.  The benefit is that existing symbolic
constants can now be used for tests.  Also the macro checks for
zero mask values and mask values that consist of multiple bytes.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner
2015-10-01 17:02:48 +02:00
committed by Martin Schwidefsky
parent 0ac277790e
commit 83abeffbd5
3 changed files with 98 additions and 64 deletions
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9
arch/s390/include/asm/nmi.h
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@@ -11,8 +11,16 @@
#ifndef _ASM_S390_NMI_H
#define _ASM_S390_NMI_H
#include <linux/const.h>
#include <linux/types.h>
#define MCCK_CODE_SYSTEM_DAMAGE _BITUL(63)
#define MCCK_CODE_CPU_TIMER_VALID _BITUL(63 - 46)
#define MCCK_CODE_PSW_MWP_VALID _BITUL(63 - 20)
#define MCCK_CODE_PSW_IA_VALID _BITUL(63 - 23)
#ifndef __ASSEMBLY__
struct mci {
__u32 sd : 1; /* 00 system damage */
__u32 pd : 1; /* 01 instruction-processing damage */
@@ -63,4 +71,5 @@ struct pt_regs;
extern void s390_handle_mcck(void);
extern void s390_do_machine_check(struct pt_regs *regs);
#endif /* __ASSEMBLY__ */
#endif /* _ASM_S390_NMI_H */