From e3f27812adad6393026b9c7c08c4fc93dc500202 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Sun, 23 Feb 2025 20:52:36 -0500
Subject: [PATCH] Allocate memory regions for XHCI

---
 src/hulk/usb/xhci.d | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/src/hulk/usb/xhci.d b/src/hulk/usb/xhci.d
index a1a4321..de54d42 100644
--- a/src/hulk/usb/xhci.d
+++ b/src/hulk/usb/xhci.d
@@ -9,7 +9,9 @@
 module hulk.usb.xhci;
 
 import hulk.pci;
+import hulk.hurl;
 import hulk.hurl.a1;
+import hulk.hippo;
 import hulk.klog;
 import hulk.time;
 import hulk.volatile;
@@ -358,6 +360,39 @@ struct XHCI
             Klog.writefln("XHCI controller failed to initialize");
             return;
         }
+
+        /* Allocate memory for various controller data structures. */
+        ubyte * page = cast(ubyte *)Hippo.allocate_page();
+        /* Device Context Index: 2K */
+        void * device_context_index = page;
+        /* Device Context: 2K */
+        void * device_context = &page[2048];
+        page = cast(ubyte *)Hippo.allocate_page();
+        /* Input Control Context: 64 bytes */
+        void * input_control_context = page;
+        /* Slot Context: 64 bytes */
+        void * slot_context = &page[64];
+        /* Endpoint Context: 64 bytes */
+        void * endpoint_context = &page[128];
+        /* Stream Context: 16 bytes */
+        void * stream_context = &page[192];
+        /* Scratchpad Buffer Array: 248 bytes */
+        void * scratchpad_buffer_array = &page[256];
+        /* Stream Array (Linear): 1M */
+        void * stream_array_linear = Hippo.allocate_aligned_region(1024 * 1024, PAGE_SIZE);
+        /* Stream Array (Pri/Sec): 4K */
+        void * stream_array_pri_sec = Hippo.allocate_page();
+        /* Transfer Ring Segments: 64K */
+        void * transfer_ring_segments = Hippo.allocate_aligned_region(64 * 1024, 64 * 1024);
+        /* Command Ring Segments: 64K */
+        void * command_ring_segments = Hippo.allocate_aligned_region(64 * 1024, 64 * 1024);
+        /* Event Ring Segments: 64K */
+        void * event_ring_segments = Hippo.allocate_aligned_region(64 * 1024, 64 * 1024);
+        /* Event Ring Segment Table: 512K */
+        void * event_ring_segment_table = Hippo.allocate_aligned_region(512 * 1024, PAGE_SIZE);
+        /* Scratchpad Buffers: 4K */
+        void * scratchpad_buffers = Hippo.allocate_page();
+
         /* TODO: write dcbaap. */
         /* TODO: write cr_ctrl. */
         /+ TODO: