tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef LINUX_KEXEC_HANDOVER_H
3#define LINUX_KEXEC_HANDOVER_H
4
5#include <linux/types.h>
6#include <linux/errno.h>
7
8struct kho_scratch {
9 phys_addr_t addr;
10 phys_addr_t size;
11};
12
13/* KHO Notifier index */
14enum kho_event {
15 KEXEC_KHO_FINALIZE = 0,
16 KEXEC_KHO_ABORT = 1,
17};
18
19struct folio;
20struct notifier_block;
21
22#define DECLARE_KHOSER_PTR(name, type) \
23 union { \
24 phys_addr_t phys; \
25 type ptr; \
26 } name
27#define KHOSER_STORE_PTR(dest, val) \
28 ({ \
29 typeof(val) v = val; \
30 typecheck(typeof((dest).ptr), v); \
31 (dest).phys = virt_to_phys(v); \
32 })
33#define KHOSER_LOAD_PTR(src) \
34 ({ \
35 typeof(src) s = src; \
36 (typeof((s).ptr))((s).phys ? phys_to_virt((s).phys) : NULL); \
37 })
38
39struct kho_serialization;
40
41#ifdef CONFIG_KEXEC_HANDOVER
42bool kho_is_enabled(void);
43
44int kho_preserve_folio(struct folio *folio);
45int kho_preserve_phys(phys_addr_t phys, size_t size);
46struct folio *kho_restore_folio(phys_addr_t phys);
47int kho_add_subtree(struct kho_serialization *ser, const char *name, void *fdt);
48int kho_retrieve_subtree(const char *name, phys_addr_t *phys);
49
50int register_kho_notifier(struct notifier_block *nb);
51int unregister_kho_notifier(struct notifier_block *nb);
52
53void kho_memory_init(void);
54
55void kho_populate(phys_addr_t fdt_phys, u64 fdt_len, phys_addr_t scratch_phys,
56 u64 scratch_len);
57#else
58static inline bool kho_is_enabled(void)
59{
60 return false;
61}
62
63static inline int kho_preserve_folio(struct folio *folio)
64{
65 return -EOPNOTSUPP;
66}
67
68static inline int kho_preserve_phys(phys_addr_t phys, size_t size)
69{
70 return -EOPNOTSUPP;
71}
72
73static inline struct folio *kho_restore_folio(phys_addr_t phys)
74{
75 return NULL;
76}
77
78static inline int kho_add_subtree(struct kho_serialization *ser,
79 const char *name, void *fdt)
80{
81 return -EOPNOTSUPP;
82}
83
84static inline int kho_retrieve_subtree(const char *name, phys_addr_t *phys)
85{
86 return -EOPNOTSUPP;
87}
88
89static inline int register_kho_notifier(struct notifier_block *nb)
90{
91 return -EOPNOTSUPP;
92}
93
94static inline int unregister_kho_notifier(struct notifier_block *nb)
95{
96 return -EOPNOTSUPP;
97}
98
99static inline void kho_memory_init(void)
100{
101}
102
103static inline void kho_populate(phys_addr_t fdt_phys, u64 fdt_len,
104 phys_addr_t scratch_phys, u64 scratch_len)
105{
106}
107#endif /* CONFIG_KEXEC_HANDOVER */
108
109#endif /* LINUX_KEXEC_HANDOVER_H */