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s390/boot: Convert __diag260() to extable

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Shorten __diag260() 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 15:59:07 +01:00 committed by Vasily Gorbik
parent 68d699650b
commit 0b4bf776f3
1 changed files with 6 additions and 20 deletions
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26
arch/s390/boot/physmem_info.c
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@ -59,36 +59,22 @@ void add_physmem_online_range(u64 start, u64 end)
static int __diag260(unsigned long rx1, unsigned long rx2)
{
unsigned long reg1, reg2, ry;
union register_pair rx;
int cc, exception;
psw_t old;
unsigned long ry;
rx.even = rx1;
rx.odd = rx2;
ry = 0x10; /* storage configuration */
exception = 1;
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 %[rx],%[ry],0x260\n"
" lhi %[exc],0\n"
"1: mvc 0(16,%[psw_pgm]),0(%[psw_old])\n"
"0: lhi %[exc],0\n"
"1:\n"
CC_IPM(cc)
: CC_OUT(cc, cc),
[exc] "+d" (exception),
[reg1] "=&d" (reg1),
[reg2] "=&a" (reg2),
[ry] "+&d" (ry),
"+Q" (get_lowcore()->program_new_psw),
"=Q" (old)
: [rx] "d" (rx.pair),
[psw_old] "a" (&old),
[psw_pgm] "a" (&get_lowcore()->program_new_psw)
EX_TABLE(0b, 1b)
: CC_OUT(cc, cc), [exc] "+d" (exception), [ry] "+d" (ry)
: [rx] "d" (rx.pair)
: CC_CLOBBER_LIST("memory"));
cc = exception ? -1 : CC_TRANSFORM(cc);
return cc == 0 ? ry : -1;