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s390/boot: Convert __diag308() to extable

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Shorten __diag308() and use regular EX_TABLE program check handling.

Acked-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
2025-02-24 15:59:11 +01:00
committed by Vasily Gorbik
parent 097cf5d57f
commit 9ef496ddf9
1 changed files with 5 additions and 20 deletions
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25
arch/s390/boot/ipl_parm.c
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@@ -35,29 +35,14 @@ int vmalloc_size_set;
static inline int __diag308(unsigned long subcode, void *addr)
{
unsigned long reg1, reg2;
union register_pair r1;
psw_t old;
union register_pair r1 = { .even = (unsigned long)addr, .odd = 0 };
r1.even = (unsigned long) addr;
r1.odd = 0;
asm volatile(
" mvc 0(16,%[psw_old]),0(%[psw_pgm])\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"
: [r1] "+&d" (r1.pair),
[reg1] "=&d" (reg1),
[reg2] "=&a" (reg2),
"+Q" (get_lowcore()->program_new_psw),
"=Q" (old)
: [subcode] "d" (subcode),
[psw_old] "a" (&old),
[psw_pgm] "a" (&get_lowcore()->program_new_psw)
"0:\n"
EX_TABLE(0b, 0b)
: [r1] "+d" (r1.pair)
: [subcode] "d" (subcode)
: "cc", "memory");
return r1.odd;
}