Changeset 60d3f35 in mainline for uspace/drv/bus/usb/xhci/hw_struct/context.h

Timestamp:

2018-01-20T12:23:18Z (6 years ago)

Author:

Jenda <jenda.jzqk73@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

129b821f

Parents:

c280d7e

Message:

hw_structs: explaining comment

File:

• uspace/drv/bus/usb/xhci/hw_struct/context.h (modified) (1 diff)

uspace/drv/bus/usb/xhci/hw_struct/context.h

@@ -189 +189 @@
 #define XHCI_GET_EP_CTX(dev_ctx, hc, dci) (xhci_ep_ctx_t *)((char*)dev_ctx + (dci + XHCI_EP_ARRAY_OFFSET) * XHCI_ONE_CTX_SIZE(hc))
 
+/**
+ * As control, slot and endpoint contexts differ in size on different HCs,
+ * we need to use macros to access them at the correct offsets. The following
+ * empty structs (xhci_device_ctx_t and xhci_input_ctx_t) are used only as
+ * void pointers for type-checking.
+ */
 typedef struct xhci_device_ctx {
 } xhci_device_ctx_t;