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s390-ccw.img: Consume service interrupts

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We have to consume the outstanding service interrupt after each
service call, otherwise a correct implementation will return
CC=2 on subsequent service calls.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2015-06-19 15:40:45 +02:00 committed by Cornelia Huck
parent ec7353a146
commit bdc7fe3638
3 changed files with 34 additions and 0 deletions
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1
pc-bios/s390-ccw/s390-ccw.h
View File

@ -47,6 +47,7 @@ typedef unsigned long long __u64;
/* start.s */
void disabled_wait(void);
void consume_sclp_int(void);
/* main.c */
void virtio_panic(const char *string);

1
pc-bios/s390-ccw/sclp-ascii.c
View File

@ -24,6 +24,7 @@ static int sclp_service_call(unsigned int command, void *sccb)
" srl %0,28"
: "=&d" (cc) : "d" (command), "a" (__pa(sccb))
: "cc", "memory");
consume_sclp_int();
if (cc == 3)
return -EIO;
if (cc == 2)

32
pc-bios/s390-ccw/start.S
View File

@ -28,6 +28,38 @@ disabled_wait:
larl %r1,disabled_wait_psw
lpswe 0(%r1)
/*
* void consume_sclp_int(void)
*
* eats one sclp interrupt
*/
.globl consume_sclp_int
consume_sclp_int:
/* enable service interrupts in cr0 */
stctg 0,0,0(15)
oi 6(15), 0x2
lctlg 0,0,0(15)
/* prepare external call handler */
larl %r1, external_new_code
stg %r1, 0x1b8
larl %r1, external_new_mask
mvc 0x1b0(8),0(%r1)
/* load enabled wait PSW */
larl %r1, enabled_wait_psw
lpswe 0(%r1)
external_new_code:
/* disable service interrupts in cr0 */
stctg 0,0,0(15)
ni 6(15), 0xfd
lctlg 0,0,0(15)
br 14
.align 8
disabled_wait_psw:
.quad 0x0002000180000000,0x0000000000000000
enabled_wait_psw:
.quad 0x0302000180000000,0x0000000000000000
external_new_mask:
.quad 0x0000000180000000