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s390/ipl_parm: use register pair instead of register asm

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...and slightly cleanup the inline asm.

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 2021-06-14 18:55:07 +02:00 committed by Vasily Gorbik
parent 88c2510cec
commit 9e25092655
1 changed files with 14 additions and 12 deletions
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26
arch/s390/boot/ipl_parm.c
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@ -25,29 +25,31 @@ int kaslr_enabled;
static inline int __diag308(unsigned long subcode, void *addr)
{
register unsigned long _addr asm("0") = (unsigned long)addr;
register unsigned long _rc asm("1") = 0;
unsigned long reg1, reg2;
union register_pair r1;
psw_t old;
r1.even = (unsigned long) addr;
r1.odd = 0;
asm volatile(
" mvc 0(16,%[psw_old]),0(%[psw_pgm])\n"
" epsw %0,%1\n"
" st %0,0(%[psw_pgm])\n"
" st %1,4(%[psw_pgm])\n"
" larl %0,1f\n"
" stg %0,8(%[psw_pgm])\n"
" diag %[addr],%[subcode],0x308\n"
" epsw %[reg1],%[reg2]\n"
" st %[reg1],0(%[psw_pgm])\n"
" st %[reg2],4(%[psw_pgm])\n"
" larl %[reg1],1f\n"
" stg %[reg1],8(%[psw_pgm])\n"
" diag %[r1],%[subcode],0x308\n"
"1: mvc 0(16,%[psw_pgm]),0(%[psw_old])\n"
: "=&d" (reg1), "=&a" (reg2),
: [r1] "+&d" (r1.pair),
[reg1] "=&d" (reg1),
[reg2] "=&a" (reg2),
"+Q" (S390_lowcore.program_new_psw),
"=Q" (old),
[addr] "+d" (_addr), "+d" (_rc)
"=Q" (old)
: [subcode] "d" (subcode),
[psw_old] "a" (&old),
[psw_pgm] "a" (&S390_lowcore.program_new_psw)
: "cc", "memory");
return _rc;
return r1.odd;
}
void store_ipl_parmblock(void)