From b9d2cef90451fae9ab7e10f5f11b8840e9bfe67d Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <clyne@bitgloo.com>
Date: Sat, 28 Sep 2024 17:04:46 -0400
Subject: create Port interface

---
 portio.hpp | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 51 insertions(+), 3 deletions(-)

(limited to 'portio.hpp')

diff --git a/portio.hpp b/portio.hpp
index 0a10651..7636c14 100644
--- a/portio.hpp
+++ b/portio.hpp
@@ -5,20 +5,68 @@
 
 inline void outb(std::uint16_t port, std::uint8_t val)
 {
-    asm volatile("outb %b0, %w1" :: "a"(val), "Nd"(port) : "memory");
+    asm volatile("out %%al, %%dx" :: "a"(val), "Nd"(port) : "memory");
 }
 
 inline std::uint8_t inb(std::uint16_t port)
 {
     std::uint8_t val;
-    asm volatile("inb %w1, %b0" : "=a"(val) : "Nd"(port) : "memory");
+    asm volatile("inb %%dx" : "=a"(val) : "Nd"(port) : "memory");
     return val;
 }
- 
+
+inline void outw(std::uint16_t port, std::uint16_t val)
+{
+    asm volatile("out %%ax, %%dx" :: "a"(val), "Nd"(port) : "memory");
+}
+
+inline std::uint16_t inw(std::uint16_t port)
+{
+    std::uint16_t val;
+    asm volatile("inw %%dx" : "=a"(val) : "Nd"(port) : "memory");
+    return val;
+}
+
 inline void io_wait()
 {
     outb(0x80, 0);
 }
 
+template<std::uint16_t Addr>
+struct Port
+{
+    Port() = default;
+
+    template<typename T>
+    auto operator=(T val) noexcept {
+        if constexpr (sizeof(T) == 1)
+            outb(Addr, val);
+        else if constexpr (sizeof(T) == 2)
+            outw(Addr, val);
+
+        return *this;
+    }
+
+    template<typename T>
+    operator T() const noexcept {
+        if constexpr (sizeof(T) == 1)
+            return inb(Addr);
+        else if constexpr (sizeof(T) == 2)
+            return inw(Addr);
+    }
+
+    template<typename T>
+    bool operator==(T val) const noexcept {
+        T dat = *this;
+        return dat == val;
+    }
+
+    template<typename T>
+    auto operator&(T val) const noexcept {
+        T dat = *this;
+        return dat & val;
+    }
+};
+
 #endif // PORTIO_HPP
 
-- 
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