From be5961cd091db7a69bfc4ccd00bc2a01c2f19097 Mon Sep 17 00:00:00 2001
From: jsg <jsg@openbsd.org>
Date: Thu, 28 Mar 2024 05:38:36 +0000
Subject: [PATCH] add more iosys_map interfaces used by inteldrm guc code based
 in part on FreeBSD changes

---
 sys/dev/pci/drm/include/linux/iosys-map.h | 58 +++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/sys/dev/pci/drm/include/linux/iosys-map.h b/sys/dev/pci/drm/include/linux/iosys-map.h
index 4639769b850..1c07f18dca1 100644
--- a/sys/dev/pci/drm/include/linux/iosys-map.h
+++ b/sys/dev/pci/drm/include/linux/iosys-map.h
@@ -35,6 +35,15 @@ iosys_map_memcpy_to(struct iosys_map *ism, size_t off, const void *src,
 		memcpy(ism->vaddr + off, src, len);
 }
 
+static inline void
+iosys_map_memset(struct iosys_map *ism, size_t off, int c, size_t len)
+{
+	if (ism->is_iomem)
+		memset_io(ism->vaddr_iomem + off, c, len);
+	else
+		memset(ism->vaddr + off, c, len);
+}
+
 static inline bool
 iosys_map_is_null(const struct iosys_map *ism)
 {
@@ -78,4 +87,53 @@ iosys_map_set_vaddr(struct iosys_map *ism, void *addr)
 	ism->is_iomem = false;
 }
 
+static inline struct iosys_map
+IOSYS_MAP_INIT_OFFSET(struct iosys_map *ism, size_t off)
+{
+	struct iosys_map nism = *ism;
+	iosys_map_incr(&nism, off);
+	return nism;
+}
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112
+
+#define iosys_map_rd(_ism, _o, _t) ({					\
+	_t v;								\
+	if ((_ism)->is_iomem) {						\
+		void *addr = (_ism)->vaddr_iomem + (_o);		\
+		v = _Generic(v,						\
+		    uint8_t : ioread8(addr),				\
+		    uint16_t: ioread16(addr),				\
+		    uint32_t: ioread32(addr),				\
+		    uint64_t: ioread64(addr));				\
+	} else								\
+		v = READ_ONCE(*(_t *)((_ism)->vaddr + (_o)));		\
+	v;								\
+})
+
+#define iosys_map_wr(_ism, _o, _t, _v) ({				\
+	_t v = (_v);							\
+	if ((_ism)->is_iomem) {						\
+		void *addr = (_ism)->vaddr_iomem + (_o);		\
+		_Generic(v,						\
+		    uint8_t : iowrite8(v, addr),			\
+		    uint16_t: iowrite16(v, addr),			\
+		    uint32_t: iowrite32(v, addr),			\
+		    uint64_t: iowrite64(v, addr));			\
+	} else								\
+		WRITE_ONCE(*(_t *)((_ism)->vaddr + (_o)), v);		\
+})
+
+#define iosys_map_rd_field(_ism, _o, _t, _f) ({				\
+	_t *t;								\
+	iosys_map_rd(_ism, _o + offsetof(_t, _f), __typeof(t->_f));	\
+})
+
+#define iosys_map_wr_field(_ism, _o, _t, _f, _v) ({			\
+        _t *t;								\
+        iosys_map_wr(_ism, _o + offsetof(_t, _f), __typeof(t->_f), _v); \
+})
+
+#endif /* C11 */
+
 #endif
-- 
2.20.1