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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright IBM Corp. 2024
*/
#ifndef __ASM_S390_MACHINE_H
#define __ASM_S390_MACHINE_H
#include <linux/const.h>
#define MFEATURE_LOWCORE 0
#define MFEATURE_PCI_MIO 1
#define MFEATURE_SCC 2
#define MFEATURE_TLB_GUEST 3
#define MFEATURE_TX 4
#define MFEATURE_ESOP 5
#define MFEATURE_DIAG9C 6
#define MFEATURE_VM 7
#define MFEATURE_KVM 8
#define MFEATURE_LPAR 9
#ifndef __ASSEMBLY__
#include <linux/bitops.h>
#include <asm/alternative.h>
extern unsigned long machine_features[1];
#define MAX_MFEATURE_BIT (sizeof(machine_features) * BITS_PER_BYTE)
static inline void __set_machine_feature(unsigned int nr, unsigned long *mfeatures)
{
if (nr >= MAX_MFEATURE_BIT)
return;
__set_bit(nr, mfeatures);
}
static inline void set_machine_feature(unsigned int nr)
{
__set_machine_feature(nr, machine_features);
}
static inline void __clear_machine_feature(unsigned int nr, unsigned long *mfeatures)
{
if (nr >= MAX_MFEATURE_BIT)
return;
__clear_bit(nr, mfeatures);
}
static inline void clear_machine_feature(unsigned int nr)
{
__clear_machine_feature(nr, machine_features);
}
static bool __test_machine_feature(unsigned int nr, unsigned long *mfeatures)
{
if (nr >= MAX_MFEATURE_BIT)
return false;
return test_bit(nr, mfeatures);
}
static bool test_machine_feature(unsigned int nr)
{
return __test_machine_feature(nr, machine_features);
}
static __always_inline bool __test_machine_feature_constant(unsigned int nr)
{
asm goto(
ALTERNATIVE("brcl 15,%l[l_no]", "brcl 0,0", ALT_FEATURE(%[nr]))
:
: [nr] "i" (nr)
:
: l_no);
return true;
l_no:
return false;
}
#define DEFINE_MACHINE_HAS_FEATURE(name, feature) \
static __always_inline bool machine_has_##name(void) \
{ \
if (!__is_defined(__DECOMPRESSOR) && __builtin_constant_p(feature)) \
return __test_machine_feature_constant(feature); \
return test_machine_feature(feature); \
}
DEFINE_MACHINE_HAS_FEATURE(relocated_lowcore, MFEATURE_LOWCORE)
DEFINE_MACHINE_HAS_FEATURE(scc, MFEATURE_SCC)
DEFINE_MACHINE_HAS_FEATURE(tlb_guest, MFEATURE_TLB_GUEST)
DEFINE_MACHINE_HAS_FEATURE(tx, MFEATURE_TX)
DEFINE_MACHINE_HAS_FEATURE(esop, MFEATURE_ESOP)
DEFINE_MACHINE_HAS_FEATURE(diag9c, MFEATURE_DIAG9C)
DEFINE_MACHINE_HAS_FEATURE(vm, MFEATURE_VM)
DEFINE_MACHINE_HAS_FEATURE(kvm, MFEATURE_KVM)
DEFINE_MACHINE_HAS_FEATURE(lpar, MFEATURE_LPAR)
#define machine_is_vm machine_has_vm
#define machine_is_kvm machine_has_kvm
#define machine_is_lpar machine_has_lpar
#endif /* __ASSEMBLY__ */
#endif /* __ASM_S390_MACHINE_H */
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