[Zion][Yellowstone] First pass at adding PCI ioport access.

zion/object/pci_port.h

@@ -0,0 +1,60 @@
+#include <glacier/memory/ref_ptr.h>
+
+#include "include/ztypes.h"
+#include "object/kernel_object.h"
+
+class PciPort;
+class PciPortBound;
+
+template <>
+struct KernelObjectTag<PciPort> {
+  static const uint64_t type = KernelObject::PCI_CAP;
+};
+
+class PciPort : public KernelObject {
+ public:
+  static uint64_t DefaultPermissions() {
+    return kZionPerm_Write | kZionPerm_Read | kZionPerm_Duplicate |
+           kZionPerm_Transmit;
+  }
+
+  uint64_t TypeTag() override { return KernelObject::PCI_CAP; }
+
+  static glcr::RefPtr<PciPort> Create() { return glcr::AdoptPtr(new PciPort); }
+
+  uint32_t ReadAtOffset(uint8_t bus, uint8_t slot, uint8_t func,
+                        uint8_t offset);
+
+ private:
+  PciPort() {}
+};
+
+template <>
+struct KernelObjectTag<PciPortBound> {
+  static const uint64_t type = KernelObject::PCI_BOUND_CAP;
+};
+
+class PciPortBound : public KernelObject {
+ public:
+  static uint64_t DefaultPermissions() {
+    return kZionPerm_Write | kZionPerm_Read | kZionPerm_Duplicate;
+  }
+
+  uint64_t TypeTag() override { return KernelObject::PCI_BOUND_CAP; }
+
+  static glcr::RefPtr<PciPortBound> Create(uint8_t bus, uint8_t slot,
+                                           uint8_t func) {
+    return glcr::AdoptPtr(new PciPortBound(bus, slot, func));
+  }
+
+  uint32_t Read(uint8_t offset);
+  void Write(uint8_t offset, uint32_t data);
+
+ private:
+  PciPortBound(uint8_t bus, uint8_t slot, uint8_t func)
+      : bus_(bus), slot_(slot), func_(func) {}
+
+  uint8_t bus_;
+  uint8_t slot_;
+  uint8_t func_;
+};