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s390/hwcaps: use consistent coding style / remove comments 

Use a consistent coding style within setup_hwcaps() and remove obvious
and outdated comments.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-07-21 21:03:04 +02:00
parent 251527c9b0
commit 449fbd713f
1 changed files with 13 additions and 54 deletions
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67
arch/s390/kernel/processor.c
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@ -177,30 +177,8 @@ static void show_cpu_summary(struct seq_file *m, void *v)
}
}
/*
* Setup hardware capabilities.
*/
static int __init setup_hwcaps(void)
{
/*
* The store facility list bits numbers as found in the principles
* of operation are numbered with bit 1UL<<31 as number 0 to
* bit 1UL<<0 as number 31.
* Bit 0: instructions named N3, "backported" to esa-mode
* Bit 2: z/Architecture mode is active
* Bit 7: the store-facility-list-extended facility is installed
* Bit 17: the message-security assist is installed
* Bit 19: the long-displacement facility is installed
* Bit 21: the extended-immediate facility is installed
* Bit 22: extended-translation facility 3 is installed
* Bit 30: extended-translation facility 3 enhancement facility
* These get translated to:
* HWCAP_ESAN3 bit 0, HWCAP_ZARCH bit 1,
* HWCAP_STFLE bit 2, HWCAP_MSA bit 3,
* HWCAP_LDISP bit 4, HWCAP_EIMM bit 5 and
* HWCAP_ETF3EH bit 8 (22 && 30).
*/
/* instructions named N3, "backported" to esa-mode */
if (test_facility(0))
elf_hwcap |= HWCAP_ESAN3;
@ -225,47 +203,28 @@ static int __init setup_hwcaps(void)
if (test_facility(21))
elf_hwcap |= HWCAP_EIMM;
/* extended-translation facility 3 enhancement */
if (test_facility(22) && test_facility(30))
elf_hwcap |= HWCAP_ETF3EH;
/*
* Check for additional facilities with store-facility-list-extended.
* stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
* and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
* as stored by stfl, bits 32-xxx contain additional facilities.
* How many facility words are stored depends on the number of
* doublewords passed to the instruction. The additional facilities
* are:
* Bit 42: decimal floating point facility is installed
* Bit 44: perform floating point operation facility is installed
* translated to:
* HWCAP_DFP bit 6 (42 && 44).
*/
/* decimal floating point & perform floating point operation */
if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
elf_hwcap |= HWCAP_DFP;
/*
* Huge page support HWCAP_HPAGE is bit 7.
*/
/* huge page support */
if (MACHINE_HAS_EDAT1)
elf_hwcap |= HWCAP_HPAGE;
/*
* 64-bit register support for 31-bit processes
* HWCAP_HIGH_GPRS is bit 9.
*/
/* 64-bit register support for 31-bit processes */
elf_hwcap |= HWCAP_HIGH_GPRS;
/*
* Transactional execution support HWCAP_TE is bit 10.
*/
/* transactional execution */
if (MACHINE_HAS_TE)
elf_hwcap |= HWCAP_TE;
/*
* Vector extension HWCAP_VXRS is bit 11. The Vector extension
* can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
* instead of facility bit 129.
* Vector extension can be disabled with the "novx" parameter.
* Use MACHINE_HAS_VX instead of facility bit 129.
*/
if (MACHINE_HAS_VX) {
elf_hwcap |= HWCAP_VXRS;
@ -280,24 +239,24 @@ static int __init setup_hwcaps(void)
if (test_facility(192))
elf_hwcap |= HWCAP_VXRS_PDE2;
}
if (test_facility(150))
elf_hwcap |= HWCAP_SORT;
if (test_facility(151))
elf_hwcap |= HWCAP_DFLT;
if (test_facility(165))
elf_hwcap |= HWCAP_NNPA;
/*
* Guarded storage support HWCAP_GS is bit 12.
*/
/* guarded storage */
if (MACHINE_HAS_GS)
elf_hwcap |= HWCAP_GS;
if (MACHINE_HAS_PCI_MIO)
elf_hwcap |= HWCAP_PCI_MIO;
/*
* Virtualization support HWCAP_INT_SIE is bit 0.
*/
/* virtualization support */
if (sclp.has_sief2)
int_hwcap |= HWCAP_INT_SIE;