From 4814b51daf3898e25bcbf87fe2d03e0fcd4c5fb1 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Tue, 19 Sep 2023 11:07:18 -0400
Subject: [PATCH] Dump xHCI extended capabilities

---
 src/hulk/usb/xhci.d | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/src/hulk/usb/xhci.d b/src/hulk/usb/xhci.d
index 1eaf5ef..7a106b6 100644
--- a/src/hulk/usb/xhci.d
+++ b/src/hulk/usb/xhci.d
@@ -177,6 +177,47 @@ struct XHCI
         m_port_registers = cast(PortRegisters *)(cast(void *)m_operational_registers + 0x400);
         m_runtime_registers = cast(RuntimeRegisters *)(base_address + m_capability_registers.rts_offset);
         m_doorbell_registers = cast(DoorbellRegister *)(base_address + m_capability_registers.doorbell_offset);
+        dump_extended_capabilities();
+    }
+
+    private void dump_extended_capabilities()
+    {
+        size_t ext_cap_off = (m_capability_registers.hcc_params1 >> 16u);
+        if (ext_cap_off != 0u)
+        {
+            Klog.writefln("Extended capabilities:");
+            uint * extended_capabilities = cast(uint *)m_capability_registers + ext_cap_off;
+            for (;;)
+            {
+                uint ec0 = extended_capabilities[0];
+                size_t next_offset = (ec0 >> 8u) & 0xFFu;
+                size_t len = next_offset;
+                if (len < 1u)
+                {
+                    len = 1u;
+                }
+                ubyte type = ec0 & 0xFFu;
+                if (type == 2u)
+                {
+                    len = 4u;
+                }
+                for (size_t i = 0u; i < len; i++)
+                {
+                    uint ecv = extended_capabilities[i];
+                    Klog.writef(" %02X %02X %02X %02X",
+                            ecv & 0xFFu,
+                            (ecv >> 8u) & 0xFFu,
+                            (ecv >> 16u) & 0xFFu,
+                            (ecv >> 24u) & 0xFFu);
+                }
+                Klog.writef("\n");
+                if (next_offset == 0u)
+                {
+                    break;
+                }
+                extended_capabilities += next_offset;
+            }
+        }
     }
 
     static void build(Pci.Device * pci_device)