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| 2 | |
| 3 | * Copyright IBM Corp. 2024
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| 4 |
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| 5 |
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| 6 | #ifndef __ASM_S390_MACHINE_H
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| 7 | #define __ASM_S390_MACHINE_H
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| 8 |
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| 9 | #include <linux/const.h>
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| 10 |
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| 11 | #define MFEATURE_LOWCORE 0
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| 12 | #define MFEATURE_PCI_MIO 1
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| 13 | #define MFEATURE_SCC 2
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| 14 | #define MFEATURE_TLB_GUEST 3
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| 15 | #define MFEATURE_TX 4
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| 16 | #define MFEATURE_ESOP 5
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| 17 | #define MFEATURE_DIAG9C 6
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| 18 | #define MFEATURE_VM 7
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| 19 | #define MFEATURE_KVM 8
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| 20 | #define MFEATURE_LPAR 9
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| 21 | #define MFEATURE_DIAG288 10
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| 22 |
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| 23 | #ifndef __ASSEMBLER__
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| 24 |
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| 25 | #include <linux/bitops.h>
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| 26 | #include <asm/alternative.h>
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| 27 |
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| 28 | extern unsigned long machine_features[1];
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| 29 |
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| 30 | #define MAX_MFEATURE_BIT (sizeof(machine_features) * BITS_PER_BYTE)
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| 31 |
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| 32 | static inline void __set_machine_feature(unsigned int nr, unsigned long *mfeatures)
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| 33 | {
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| 34 | if (nr >= MAX_MFEATURE_BIT)
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| 35 | return;
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| 36 | __set_bit(nr, mfeatures);
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| 37 | }
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| 38 |
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| 39 | static inline void set_machine_feature(unsigned int nr)
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| 40 | {
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| 41 | __set_machine_feature(nr, machine_features);
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| 42 | }
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| 43 |
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| 44 | static inline void __clear_machine_feature(unsigned int nr, unsigned long *mfeatures)
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| 45 | {
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| 46 | if (nr >= MAX_MFEATURE_BIT)
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| 47 | return;
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| 48 | __clear_bit(nr, mfeatures);
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| 49 | }
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| 50 |
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| 51 | static inline void clear_machine_feature(unsigned int nr)
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| 52 | {
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| 53 | __clear_machine_feature(nr, machine_features);
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| 54 | }
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| 55 |
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| 56 | static bool __test_machine_feature(unsigned int nr, unsigned long *mfeatures)
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| 57 | {
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| 58 | if (nr >= MAX_MFEATURE_BIT)
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| 59 | return false;
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| 60 | return test_bit(nr, mfeatures);
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| 61 | }
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| 62 |
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| 63 | static bool test_machine_feature(unsigned int nr)
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| 64 | {
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| 65 | return __test_machine_feature(nr, machine_features);
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| 66 | }
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| 67 |
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| 68 | static __always_inline bool __test_machine_feature_constant(unsigned int nr)
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| 69 | {
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| 70 | asm goto(
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| 71 | ALTERNATIVE("brcl 15,%l[l_no]", "brcl 0,0", ALT_FEATURE(%[nr]))
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| 72 | :
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| 73 | : [nr] "i" (nr)
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| 74 | :
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| 75 | : l_no);
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| 76 | return true;
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| 77 | l_no:
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| 78 | return false;
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| 79 | }
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| 80 |
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| 81 | #define DEFINE_MACHINE_HAS_FEATURE(name, feature) \
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| 82 | static __always_inline bool machine_has_##name(void) \
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| 83 | { \
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| 84 | if (!__is_defined(__DECOMPRESSOR) && __builtin_constant_p(feature)) \
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| 85 | return __test_machine_feature_constant(feature); \
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| 86 | return test_machine_feature(feature); \
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| 87 | }
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| 88 |
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| 89 | DEFINE_MACHINE_HAS_FEATURE(relocated_lowcore, MFEATURE_LOWCORE)
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| 90 | DEFINE_MACHINE_HAS_FEATURE(scc, MFEATURE_SCC)
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| 91 | DEFINE_MACHINE_HAS_FEATURE(tlb_guest, MFEATURE_TLB_GUEST)
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| 92 | DEFINE_MACHINE_HAS_FEATURE(tx, MFEATURE_TX)
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| 93 | DEFINE_MACHINE_HAS_FEATURE(esop, MFEATURE_ESOP)
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| 94 | DEFINE_MACHINE_HAS_FEATURE(diag9c, MFEATURE_DIAG9C)
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| 95 | DEFINE_MACHINE_HAS_FEATURE(vm, MFEATURE_VM)
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| 96 | DEFINE_MACHINE_HAS_FEATURE(kvm, MFEATURE_KVM)
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| 97 | DEFINE_MACHINE_HAS_FEATURE(lpar, MFEATURE_LPAR)
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| 98 |
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| 99 | #define machine_is_vm machine_has_vm
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| 100 | #define machine_is_kvm machine_has_kvm
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| 101 | #define machine_is_lpar machine_has_lpar
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| 102 |
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| 103 | #endif
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| 104 | #endif
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