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s390/ctlreg: add local_ctl_load() and local_ctl_store()

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Add local_ctl_load() and local_ctl_store() which load and store contents
for only a single control register.

This allows for easier to read code, but also better type checking,
since __local_ctl_load() and __local_ctl_store() do not come with any
type checking at all (which will be changed with subsequent patches).

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2023-09-11 21:39:59 +02:00 committed by Vasily Gorbik
parent 8d5e98f8d6
commit dfa33ce124
1 changed files with 17 additions and 0 deletions
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17
arch/s390/include/asm/ctlreg.h
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@ -69,6 +69,23 @@
: [_low] "i" (low), [_high] "i" (high)); \
} while (0)
static __always_inline void local_ctl_load(unsigned int cr, unsigned long *reg)
{
asm volatile(
" lctlg %[cr],%[cr],%[reg]\n"
:
: [reg] "Q" (*reg), [cr] "i" (cr)
: "memory");
}
static __always_inline void local_ctl_store(unsigned int cr, unsigned long *reg)
{
asm volatile(
" stctg %[cr],%[cr],%[reg]\n"
: [reg] "=Q" (*reg)
: [cr] "i" (cr));
}
static __always_inline void local_ctl_set_bit(unsigned int cr, unsigned int bit)
{
unsigned long reg;