WIP: add driver objectsWIP/add_driver_obj

2 files changed, 168 insertions, 0 deletions

diff --git a/kernel/drivers/char/pl011.cpp b/kernel/drivers/char/pl011.cpp
new file mode 100644
index 0000000..7615370
--- /dev/null
+++ b/kernel/drivers/char/pl011.cpp
@@ -0,0 +1,83 @@
+// ============================================================================
+// drivers/char/pl011.cpp — PL011 UART console driver + device (aarch64)
+//
+// Stub implementation that compiles but does no real I/O yet.
+// TODO: Program IBRD, FBRD, LCR_H, CR registers for actual UART output.
+// ============================================================================
+
+#include <kernel/console_driver.h>
+#include <kernel/early_driver.h>
+#include <kernel/early_device.h>
+#include <kernel/platform_bus.h>
+
+// ── PL011Device ───────────────────────────────────────────────────────────
+
+class PL011Device : public Device, public EarlyDevice<PL011Device> {
+public:
+    explicit PL011Device(uintptr_t base_addr) : base_(base_addr) {}
+
+    const char* name() const override { return "uart0"; }
+    uintptr_t base() const { return base_; }
+
+private:
+    uintptr_t base_;
+};
+
+// ── PL011Console driver ──────────────────────────────────────────────────
+
+class PL011Console : public ConsoleDriver,
+                     public EarlyDriver<PL011Console> {
+public:
+    PL011Console() = default;
+
+    const char* name() const override { return "pl011-uart"; }
+
+    bool init() override {
+        auto* dev = static_cast<PL011Device*>(device());
+        base_ = dev->base();
+
+        // TODO: Configure UART registers at base_:
+        //   UARTIBRD (offset 0x24) — integer baud rate divisor
+        //   UARTFBRD (offset 0x28) — fractional baud rate divisor
+        //   UARTLCR_H (offset 0x2C) — line control (8N1, FIFO enable)
+        //   UARTCR (offset 0x30) — control register (TX enable, UART enable)
+        initialized_ = true;
+        return true;
+    }
+
+    void shutdown() override {
+        initialized_ = false;
+    }
+
+    void putchar(char c) override {
+        if (!initialized_) return;
+        // TODO: while (*(volatile uint32_t*)(base_ + 0x18) & (1 << 5)) {}
+        //       *(volatile uint32_t*)(base_ + 0x00) = c;
+        (void)c;
+    }
+
+    void clear() override {
+        // UART has no screen to clear
+    }
+
+private:
+    uintptr_t base_ = 0;
+    bool initialized_ = false;
+};
+
+// ── Driver init function ──────────────────────────────────────────────────
+
+namespace console {
+
+void init_pl011(uintptr_t base_addr) {
+    auto* dev = PL011Device::create(base_addr);
+    platform::bus().add_device(dev);
+
+    auto* drv = PL011Console::create();
+    drv->bind(dev);
+    drv->init();
+
+    console::register_driver(drv);
+}
+
+} // namespace console
diff --git a/kernel/drivers/char/uart_16550.cpp b/kernel/drivers/char/uart_16550.cpp
new file mode 100644
index 0000000..a85b5e7
--- /dev/null
+++ b/kernel/drivers/char/uart_16550.cpp
@@ -0,0 +1,85 @@
+// ============================================================================
+// drivers/char/uart_16550.cpp — 16550 UART console driver + device (x86_64)
+//
+// Stub implementation that compiles but does no real I/O yet.
+// TODO: Program divisor latch, 8N1, FIFO, implement actual port I/O.
+// ============================================================================
+
+#include <kernel/console_driver.h>
+#include <kernel/early_driver.h>
+#include <kernel/early_device.h>
+#include <kernel/platform_bus.h>
+
+// ── UART16550Device ───────────────────────────────────────────────────────
+
+class UART16550Device : public Device, public EarlyDevice<UART16550Device> {
+public:
+    explicit UART16550Device(uint16_t port) : port_(port) {}
+
+    const char* name() const override { return "uart0"; }
+    uint16_t port() const { return port_; }
+
+private:
+    uint16_t port_;
+};
+
+// ── UART16550Console driver ───────────────────────────────────────────────
+
+class UART16550Console : public ConsoleDriver,
+                         public EarlyDriver<UART16550Console> {
+public:
+    UART16550Console() = default;
+
+    const char* name() const override { return "uart-16550"; }
+
+    bool init() override {
+        auto* dev = static_cast<UART16550Device*>(device());
+        port_ = dev->port();
+
+        // TODO: outb(port_ + 1, 0x00)  — disable interrupts
+        // TODO: outb(port_ + 3, 0x80)  — enable DLAB
+        // TODO: outb(port_ + 0, 0x03)  — set divisor (lo) 38400 baud
+        // TODO: outb(port_ + 1, 0x00)  — set divisor (hi)
+        // TODO: outb(port_ + 3, 0x03)  — 8 bits, no parity, one stop
+        // TODO: outb(port_ + 2, 0xC7)  — enable FIFO, clear, 14-byte threshold
+        // TODO: outb(port_ + 4, 0x0B)  — IRQs enabled, RTS/DSR set
+        initialized_ = true;
+        return true;
+    }
+
+    void shutdown() override {
+        initialized_ = false;
+    }
+
+    void putchar(char c) override {
+        if (!initialized_) return;
+        // TODO: while (!(inb(port_ + 5) & 0x20)) {}  — wait for THR empty
+        // TODO: outb(port_, c)
+        (void)c;
+    }
+
+    void clear() override {
+        // UART has no screen to clear
+    }
+
+private:
+    uint16_t port_ = 0;
+    bool initialized_ = false;
+};
+
+// ── Driver init function ──────────────────────────────────────────────────
+
+namespace console {
+
+void init_uart_16550(uint16_t port) {
+    auto* dev = UART16550Device::create(port);
+    platform::bus().add_device(dev);
+
+    auto* drv = UART16550Console::create();
+    drv->bind(dev);
+    drv->init();
+
+    console::register_driver(drv);
+}
+
+} // namespace console