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