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s390/boot: Convert diag500_storage_limit() to extable

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Shorten diag500_storage_limit() 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 15:59:09 +01:00 committed by Vasily Gorbik
parent 7063bb2900
commit b1879e7ee7
1 changed files with 7 additions and 21 deletions
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28
arch/s390/boot/physmem_info.c
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@ -104,29 +104,15 @@ static int diag260(void)
static int diag500_storage_limit(unsigned long *max_physmem_end)
{
unsigned long storage_limit;
unsigned long reg1, reg2;
psw_t old;
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"
" lghi 1,%[subcode]\n"
" lghi 2,0\n"
" diag 2,4,0x500\n"
"1: mvc 0(16,%[psw_pgm]),0(%[psw_old])\n"
" lgr %[slimit],2\n"
: [reg1] "=&d" (reg1),
[reg2] "=&a" (reg2),
[slimit] "=d" (storage_limit),
"=Q" (get_lowcore()->program_new_psw),
"=Q" (old)
: [psw_old] "a" (&old),
[psw_pgm] "a" (&get_lowcore()->program_new_psw),
[subcode] "i" (DIAG500_SC_STOR_LIMIT)
" lghi %%r1,%[subcode]\n"
" lghi %%r2,0\n"
" diag %%r2,%%r4,0x500\n"
"0: lgr %[slimit],%%r2\n"
EX_TABLE(0b, 0b)
: [slimit] "=d" (storage_limit)
: [subcode] "i" (DIAG500_SC_STOR_LIMIT)
: "memory", "1", "2");
if (!storage_limit)
return -EINVAL;