@@ -49,6 +49,7 @@
 
 #include <acpi/actbl1.h>
 #include <acpi/ghes.h>
+#include <acpi/ghes_cper.h>
 #include <acpi/apei.h>
 #include <asm/fixmap.h>
 #include <asm/tlbflush.h>

@@ -57,40 +58,6 @@
 
 #include "apei-internal.h"
 
-#define GHES_PFX	"GHES: "
-
-#define GHES_ESTATUS_MAX_SIZE		65536
-#define GHES_ESOURCE_PREALLOC_MAX_SIZE	65536
-
-#define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
-
-/* This is just an estimation for memory pool allocation */
-#define GHES_ESTATUS_CACHE_AVG_SIZE	512
-
-#define GHES_ESTATUS_CACHES_SIZE	4
-
-#define GHES_ESTATUS_IN_CACHE_MAX_NSEC	10000000000ULL
-/* Prevent too many caches are allocated because of RCU */
-#define GHES_ESTATUS_CACHE_ALLOCED_MAX	(GHES_ESTATUS_CACHES_SIZE * 3 / 2)
-
-#define GHES_ESTATUS_CACHE_LEN(estatus_len)			\
-	(sizeof(struct ghes_estatus_cache) + (estatus_len))
-#define GHES_ESTATUS_FROM_CACHE(estatus_cache)			\
-	((struct acpi_hest_generic_status *)				\
-	 ((struct ghes_estatus_cache *)(estatus_cache) + 1))
-
-#define GHES_ESTATUS_NODE_LEN(estatus_len)			\
-	(sizeof(struct ghes_estatus_node) + (estatus_len))
-#define GHES_ESTATUS_FROM_NODE(estatus_node)			\
-	((struct acpi_hest_generic_status *)				\
-	 ((struct ghes_estatus_node *)(estatus_node) + 1))
-
-#define GHES_VENDOR_ENTRY_LEN(gdata_len)                               \
-	(sizeof(struct ghes_vendor_record_entry) + (gdata_len))
-#define GHES_GDATA_FROM_VENDOR_ENTRY(vendor_entry)                     \
-	((struct acpi_hest_generic_data *)                              \
-	((struct ghes_vendor_record_entry *)(vendor_entry) + 1))
-
 /*
  *  NMI-like notifications vary by architecture, before the compiler can prune
  *  unused static functions it needs a value for these enums.

@@ -102,25 +69,6 @@
 
 static ATOMIC_NOTIFIER_HEAD(ghes_report_chain);
 
-static inline bool is_hest_type_generic_v2(struct ghes *ghes)
-{
-	return ghes->generic->header.type == ACPI_HEST_TYPE_GENERIC_ERROR_V2;
-}
-
-/*
- * A platform may describe one error source for the handling of synchronous
- * errors (e.g. MCE or SEA), or for handling asynchronous errors (e.g. SCI
- * or External Interrupt). On x86, the HEST notifications are always
- * asynchronous, so only SEA on ARM is delivered as a synchronous
- * notification.
- */
-static inline bool is_hest_sync_notify(struct ghes *ghes)
-{
-	u8 notify_type = ghes->generic->notify.type;
-
-	return notify_type == ACPI_HEST_NOTIFY_SEA;
-}
-
 /*
  * This driver isn't really modular, however for the time being,
  * continuing to use module_param is the easiest way to remain

@@ -165,12 +113,6 @@ static DEFINE_MUTEX(ghes_devs_mutex);
  */
 static DEFINE_SPINLOCK(ghes_notify_lock_irq);
 
-struct ghes_vendor_record_entry {
-	struct work_struct work;
-	int error_severity;
-	char vendor_record[];
-};
-
 static struct gen_pool *ghes_estatus_pool;
 
 static struct ghes_estatus_cache __rcu *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];

@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * APEI Generic Hardware Error Source: CPER Helper
+ *
+ * Copyright (C) 2026 ARM Ltd.
+ * Author: Ahmed Tiba <ahmed.tiba@arm.com>
+ * Based on ACPI APEI GHES driver.
+ *
+ */
+
+#ifndef ACPI_APEI_GHES_CPER_H
+#define ACPI_APEI_GHES_CPER_H
+
+#include <linux/workqueue.h>
+
+#include <acpi/ghes.h>
+
+#define GHES_PFX	"GHES: "
+
+#define GHES_ESTATUS_MAX_SIZE		65536
+#define GHES_ESOURCE_PREALLOC_MAX_SIZE	65536
+
+#define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
+
+/* This is just an estimation for memory pool allocation */
+#define GHES_ESTATUS_CACHE_AVG_SIZE	512
+
+#define GHES_ESTATUS_CACHES_SIZE	4
+
+#define GHES_ESTATUS_IN_CACHE_MAX_NSEC	10000000000ULL
+/* Prevent too many caches are allocated because of RCU */
+#define GHES_ESTATUS_CACHE_ALLOCED_MAX	(GHES_ESTATUS_CACHES_SIZE * 3 / 2)
+
+#define GHES_ESTATUS_CACHE_LEN(estatus_len)			\
+	(sizeof(struct ghes_estatus_cache) + (estatus_len))
+#define GHES_ESTATUS_FROM_CACHE(estatus_cache)			\
+	((struct acpi_hest_generic_status *)				\
+	 ((struct ghes_estatus_cache *)(estatus_cache) + 1))
+
+#define GHES_ESTATUS_NODE_LEN(estatus_len)			\
+	(sizeof(struct ghes_estatus_node) + (estatus_len))
+#define GHES_ESTATUS_FROM_NODE(estatus_node)			\
+	((struct acpi_hest_generic_status *)				\
+	 ((struct ghes_estatus_node *)(estatus_node) + 1))
+
+#define GHES_VENDOR_ENTRY_LEN(gdata_len)                               \
+	(sizeof(struct ghes_vendor_record_entry) + (gdata_len))
+#define GHES_GDATA_FROM_VENDOR_ENTRY(vendor_entry)                     \
+	((struct acpi_hest_generic_data *)                              \
+	((struct ghes_vendor_record_entry *)(vendor_entry) + 1))
+
+static inline bool is_hest_type_generic_v2(struct ghes *ghes)
+{
+	return ghes->generic->header.type == ACPI_HEST_TYPE_GENERIC_ERROR_V2;
+}
+
+/*
+ * A platform may describe one error source for the handling of synchronous
+ * errors (e.g. MCE or SEA), or for handling asynchronous errors (e.g. SCI
+ * or External Interrupt). On x86, the HEST notifications are always
+ * asynchronous, so only SEA on ARM is delivered as a synchronous
+ * notification.
+ */
+static inline bool is_hest_sync_notify(struct ghes *ghes)
+{
+	u8 notify_type = ghes->generic->notify.type;
+
+	return notify_type == ACPI_HEST_NOTIFY_SEA;
+}
+
+struct ghes_vendor_record_entry {
+	struct work_struct work;
+	int error_severity;
+	char vendor_record[];
+};
+
+static struct ghes *ghes_new(struct acpi_hest_generic *generic);
+static void ghes_fini(struct ghes *ghes);
+
+static int ghes_read_estatus(struct ghes *ghes,
+		      struct acpi_hest_generic_status *estatus,
+		      u64 *buf_paddr, enum fixed_addresses fixmap_idx);
+static void ghes_clear_estatus(struct ghes *ghes,
+			struct acpi_hest_generic_status *estatus,
+			u64 buf_paddr, enum fixed_addresses fixmap_idx);
+static int __ghes_peek_estatus(struct ghes *ghes,
+			struct acpi_hest_generic_status *estatus,
+			u64 *buf_paddr, enum fixed_addresses fixmap_idx);
+static int __ghes_check_estatus(struct ghes *ghes,
+			 struct acpi_hest_generic_status *estatus);
+static int __ghes_read_estatus(struct acpi_hest_generic_status *estatus,
+			u64 buf_paddr, enum fixed_addresses fixmap_idx,
+			size_t buf_len);
+
+#endif /* ACPI_APEI_GHES_CPER_H */