110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_KEXEC_HANDOVER_H
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#define LINUX_KEXEC_HANDOVER_H
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#include <linux/types.h>
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#include <linux/errno.h>
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struct kho_scratch {
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phys_addr_t addr;
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phys_addr_t size;
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};
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/* KHO Notifier index */
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enum kho_event {
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KEXEC_KHO_FINALIZE = 0,
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KEXEC_KHO_ABORT = 1,
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};
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struct folio;
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struct notifier_block;
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#define DECLARE_KHOSER_PTR(name, type) \
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union { \
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phys_addr_t phys; \
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type ptr; \
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} name
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#define KHOSER_STORE_PTR(dest, val) \
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({ \
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typeof(val) v = val; \
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typecheck(typeof((dest).ptr), v); \
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(dest).phys = virt_to_phys(v); \
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})
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#define KHOSER_LOAD_PTR(src) \
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({ \
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typeof(src) s = src; \
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(typeof((s).ptr))((s).phys ? phys_to_virt((s).phys) : NULL); \
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})
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struct kho_serialization;
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#ifdef CONFIG_KEXEC_HANDOVER
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bool kho_is_enabled(void);
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int kho_preserve_folio(struct folio *folio);
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int kho_preserve_phys(phys_addr_t phys, size_t size);
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struct folio *kho_restore_folio(phys_addr_t phys);
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int kho_add_subtree(struct kho_serialization *ser, const char *name, void *fdt);
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int kho_retrieve_subtree(const char *name, phys_addr_t *phys);
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int register_kho_notifier(struct notifier_block *nb);
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int unregister_kho_notifier(struct notifier_block *nb);
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void kho_memory_init(void);
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void kho_populate(phys_addr_t fdt_phys, u64 fdt_len, phys_addr_t scratch_phys,
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u64 scratch_len);
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#else
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static inline bool kho_is_enabled(void)
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{
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return false;
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}
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static inline int kho_preserve_folio(struct folio *folio)
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{
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return -EOPNOTSUPP;
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}
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static inline int kho_preserve_phys(phys_addr_t phys, size_t size)
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{
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return -EOPNOTSUPP;
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}
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static inline struct folio *kho_restore_folio(phys_addr_t phys)
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{
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return NULL;
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}
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static inline int kho_add_subtree(struct kho_serialization *ser,
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const char *name, void *fdt)
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{
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return -EOPNOTSUPP;
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}
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static inline int kho_retrieve_subtree(const char *name, phys_addr_t *phys)
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{
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return -EOPNOTSUPP;
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}
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static inline int register_kho_notifier(struct notifier_block *nb)
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{
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return -EOPNOTSUPP;
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}
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static inline int unregister_kho_notifier(struct notifier_block *nb)
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{
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return -EOPNOTSUPP;
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}
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static inline void kho_memory_init(void)
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{
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}
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static inline void kho_populate(phys_addr_t fdt_phys, u64 fdt_len,
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phys_addr_t scratch_phys, u64 scratch_len)
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{
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}
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#endif /* CONFIG_KEXEC_HANDOVER */
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#endif /* LINUX_KEXEC_HANDOVER_H */
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