Provide busdma stubs for loader/kshim

Simple bus space stubs require the VA-PA mapping
    to be identical.

Approved by:           hselasky, cognet (mentor)
Differential revision: https://reviews.freebsd.org/D4314

sys/boot/kshim/bsd_kernel.c

@@ -47,6 +47,74 @@ mtx_system_init(void *arg)
 }
 SYSINIT(mtx_system_init, SI_SUB_LOCK, SI_ORDER_MIDDLE, mtx_system_init, NULL);
 
+int
+bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
+		   bus_size_t boundary, bus_addr_t lowaddr,
+		   bus_addr_t highaddr, bus_dma_filter_t *filter,
+		   void *filterarg, bus_size_t maxsize, int nsegments,
+		   bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
+		   void *lockfuncarg, bus_dma_tag_t *dmat)
+{
+	struct bus_dma_tag *ret;
+
+	ret = malloc(sizeof(struct bus_dma_tag), XXX, XXX);
+	if (*dmat == NULL)
+		return (ENOMEM);
+	ret->alignment = alignment;
+	ret->maxsize = maxsize;
+
+	*dmat = ret;
+
+	return (0);
+}
+
+int
+bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
+    bus_dmamap_t *mapp)
+{
+	void *addr;
+
+	addr = malloc(dmat->maxsize + dmat->alignment, XXX, XXX);
+	if (addr == 0)
+		return (ENOMEM);
+
+	*mapp = addr;
+	addr = (void*)(((uintptr_t)addr + dmat->alignment - 1) & ~(dmat->alignment - 1));
+
+	*vaddr = addr;
+	return (0);
+}
+
+int
+bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
+    bus_size_t buflen, bus_dmamap_callback_t *callback,
+    void *callback_arg, int flags)
+{
+	bus_dma_segment_t segs[1];
+
+	segs[0].ds_addr = (uintptr_t)buf;
+	segs[0].ds_len = buflen;
+
+	(*callback)(callback_arg, segs, 1, 0);
+
+	return (0);
+}
+
+void
+bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
+{
+
+	free(map, XXX);
+}
+
+int
+bus_dma_tag_destroy(bus_dma_tag_t dmat)
+{
+
+	free(dmat, XXX);
+	return (0);
+}
+
 struct resource *
 bus_alloc_resource_any(device_t dev, int type, int *rid, unsigned int flags)
 {

sys/boot/kshim/bsd_kernel.h

@@ -48,8 +48,15 @@
 #define	USB_BUS_EXPLORE_PROC(bus) (usb_process + 0)
 #define	USB_BUS_CONTROL_XFER_PROC(bus) (usb_process + 1)
 #define	SYSCTL_DECL(...)
+struct sysctl_req {
+	void		*newptr;
+};
+#define	SYSCTL_HANDLER_ARGS void *oidp, void *arg1,	\
+	uint32_t arg2, struct sysctl_req *req
 #define	SYSCTL_NODE(name,...) struct { } name __used
 #define	SYSCTL_INT(...)
+#define	SYSCTL_UINT(...)
+#define	SYSCTL_PROC(...)
 #define	TUNABLE_INT(...)
 #define	MALLOC_DECLARE(...)
 #define	MALLOC_DEFINE(...)
@@ -65,6 +72,7 @@
 #define	MOD_UNLOAD 2
 #define	DEVMETHOD(what,func) { #what, (void *)&func }
 #define	DEVMETHOD_END {0,0}
+#define	EARLY_DRIVER_MODULE(a, b, c, d, e, f, g)	DRIVER_MODULE(a, b, c, d, e, f)
 #define	DRIVER_MODULE(name, busname, driver, devclass, evh, arg)	\
   static struct module_data bsd_##name##_##busname##_driver_mod = {	\
 	evh, arg, #busname, #name, #busname "/" #name,			\
@@ -202,11 +210,30 @@ typedef unsigned long u_long;
 typedef unsigned long bus_addr_t;
 typedef unsigned long bus_size_t;
 
+typedef struct bus_dma_segment {
+	bus_addr_t	ds_addr;	/* DMA address */
+	bus_size_t	ds_len;		/* length of transfer */
+} bus_dma_segment_t;
+
+struct bus_dma_tag {
+	uint32_t	alignment;
+	uint32_t	maxsize;
+};
+
 typedef void *bus_dmamap_t;
-typedef void *bus_dma_tag_t;
+typedef struct bus_dma_tag *bus_dma_tag_t;
+
+typedef enum {
+	BUS_DMA_LOCK	= 0x01,
+	BUS_DMA_UNLOCK	= 0x02,
+} bus_dma_lock_op_t;
 
 typedef void *bus_space_tag_t;
 typedef uint8_t *bus_space_handle_t;
+typedef int bus_dma_filter_t(void *, bus_addr_t);
+typedef void bus_dma_lock_t(void *, bus_dma_lock_op_t);
+
+typedef uint32_t bool;
 
 /* SYSINIT API */
 
@@ -582,4 +609,37 @@ extern int (*ofw_bus_is_compatible_cb)(device_t dev, char *name);
 /* Should be defined in user application since it is machine-dependent */
 extern int delay(unsigned int);
 
+/* BUS dma */
+#define	BUS_SPACE_MAXADDR_24BIT	0xFFFFFF
+#define	BUS_SPACE_MAXADDR_32BIT	0xFFFFFFFF
+#define	BUS_SPACE_MAXADDR	0xFFFFFFFF
+#define	BUS_SPACE_MAXSIZE_24BIT	0xFFFFFF
+#define	BUS_SPACE_MAXSIZE_32BIT	0xFFFFFFFF
+#define	BUS_SPACE_MAXSIZE	0xFFFFFFFF
+
+#define	BUS_DMA_WAITOK		0x00	/* safe to sleep (pseudo-flag) */
+#define	BUS_DMA_NOWAIT		0x01	/* not safe to sleep */
+#define	BUS_DMA_ALLOCNOW	0x02	/* perform resource allocation now */
+#define	BUS_DMA_COHERENT	0x04	/* hint: map memory in a coherent way */
+#define	BUS_DMA_ZERO		0x08	/* allocate zero'ed memory */
+#define	BUS_DMA_BUS1		0x10	/* placeholders for bus functions... */
+#define	BUS_DMA_BUS2		0x20
+#define	BUS_DMA_BUS3		0x40
+#define	BUS_DMA_BUS4		0x80
+
+typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int);
+
+int
+bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
+		   bus_size_t boundary, bus_addr_t lowaddr,
+		   bus_addr_t highaddr, bus_dma_filter_t *filter,
+		   void *filterarg, bus_size_t maxsize, int nsegments,
+		   bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
+		   void *lockfuncarg, bus_dma_tag_t *dmat);
+
+int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
+    bus_dmamap_t *mapp);
+void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
+int bus_dma_tag_destroy(bus_dma_tag_t dmat);
+
 #endif					/* _BSD_KERNEL_H_ */