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s390/hwcaps: open code initialization of first six hwcap bits

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The first six hwcap bits are initialized in a rather odd way: an array
contains the stfl(e) bits which need to be set, so that the
corresponding bit position (= array index) within hwcaps are set.

Better open code it like it is done for all other bits, making it
obvious which bit is set when.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-07-21 20:58:03 +02:00
parent 873129ca7b
commit 251527c9b0
1 changed files with 24 additions and 6 deletions
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30
arch/s390/kernel/processor.c
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@ -182,9 +182,6 @@ static void show_cpu_summary(struct seq_file *m, void *v)
*/
static int __init setup_hwcaps(void)
{
static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
int i;
/*
* The store facility list bits numbers as found in the principles
* of operation are numbered with bit 1UL<<31 as number 0 to
@ -203,9 +200,30 @@ static int __init setup_hwcaps(void)
* HWCAP_LDISP bit 4, HWCAP_EIMM bit 5 and
* HWCAP_ETF3EH bit 8 (22 && 30).
*/
for (i = 0; i < 6; i++)
if (test_facility(stfl_bits[i]))
elf_hwcap |= 1UL << i;
/* instructions named N3, "backported" to esa-mode */
if (test_facility(0))
elf_hwcap |= HWCAP_ESAN3;
/* z/Architecture mode active */
if (test_facility(2))
elf_hwcap |= HWCAP_ZARCH;
/* store-facility-list-extended */
if (test_facility(7))
elf_hwcap |= HWCAP_STFLE;
/* message-security assist */
if (test_facility(17))
elf_hwcap |= HWCAP_MSA;
/* long-displacement */
if (test_facility(19))
elf_hwcap |= HWCAP_LDISP;
/* extended-immediate */
if (test_facility(21))
elf_hwcap |= HWCAP_EIMM;
if (test_facility(22) && test_facility(30))
elf_hwcap |= HWCAP_ETF3EH;