[kvm-unit-tests PATCH v6 08/10] s390x: define wfi: wait for interrupt

Pierre Morel
2020-04-24T10:46:03Z

wfi(irq_mask) allows the programm to wait for an interrupt.
The interrupt handler is in charge to remove the WAIT bit
when it finished handling interrupt.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
lib/s390x/asm/arch_def.h | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h
index a0d2362..e04866c 100644
--- a/lib/s390x/asm/arch_def.h
+++ b/lib/s390x/asm/arch_def.h
@@ -13,6 +13,7 @@
#define PSW_MASK_EXT 0x0100000000000000UL
#define PSW_MASK_DAT 0x0400000000000000UL
#define PSW_MASK_SHORT_PSW 0x0008000000000000UL
+#define PSW_MASK_WAIT 0x0002000000000000UL
#define PSW_MASK_PSTATE 0x0001000000000000UL
#define PSW_MASK_BA 0x0000000080000000UL
#define PSW_MASK_EA 0x0000000100000000UL
@@ -254,6 +255,16 @@ static inline void load_psw_mask(uint64_t mask)
: "+r" (tmp) : "a" (&psw) : "memory", "cc" );
}

+static inline void wfi(uint64_t irq_mask)
+{
+ uint64_t psw_mask;
+
+ psw_mask = extract_psw_mask();
+ load_psw_mask(psw_mask | irq_mask | PSW_MASK_WAIT);
+ load_psw_mask(psw_mask);
+}
+
+
static inline void enter_pstate(void)
{
uint64_t mask;
--
2.25.1