refactor: promote new architecture to repository root

Archive the deprecated implementation under lume-legacy, make the new kernel the default root-level build, and update repository entry points without changing kernel behavior.

1 files changed, 108 insertions, 0 deletions

diff --git a/lume-legacy/include/drivers/virtio.h b/lume-legacy/include/drivers/virtio.h
new file mode 100644
index 0000000..9fda8cf
--- /dev/null
+++ b/lume-legacy/include/drivers/virtio.h
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2026 Richard QIn
+ */
+
+#pragma once
+#include "common/types.h"
+
+// VirtIO MMIO Base Address
+#define VIRTIO0 0x10001000
+
+// MMIO Registers (Modern / Version 2)
+#define VIRTIO_MMIO_MAGIC_VALUE 0x000
+#define VIRTIO_MMIO_VERSION 0x004
+#define VIRTIO_MMIO_DEVICE_ID 0x008
+#define VIRTIO_MMIO_VENDOR_ID 0x00c
+#define VIRTIO_MMIO_DEVICE_FEATURES 0x010
+#define VIRTIO_MMIO_DEVICE_FEATURES_SEL 0x014
+#define VIRTIO_MMIO_DRIVER_FEATURES 0x020
+#define VIRTIO_MMIO_DRIVER_FEATURES_SEL 0x024
+#define VIRTIO_MMIO_QUEUE_SEL 0x030
+#define VIRTIO_MMIO_QUEUE_NUM_MAX 0x034
+#define VIRTIO_MMIO_QUEUE_NUM 0x038
+#define VIRTIO_MMIO_QUEUE_READY 0x044
+#define VIRTIO_MMIO_QUEUE_NOTIFY 0x050
+#define VIRTIO_MMIO_INTERRUPT_STATUS 0x060
+#define VIRTIO_MMIO_INTERRUPT_ACK 0x064
+#define VIRTIO_MMIO_STATUS 0x070
+
+// 64-bit Queue Address Registers (Modern)
+#define VIRTIO_MMIO_QUEUE_DESC_LOW 0x080
+#define VIRTIO_MMIO_QUEUE_DESC_HIGH 0x084
+#define VIRTIO_MMIO_QUEUE_DRIVER_LOW 0x090
+#define VIRTIO_MMIO_QUEUE_DRIVER_HIGH 0x094
+#define VIRTIO_MMIO_QUEUE_DEVICE_LOW 0x0a0
+#define VIRTIO_MMIO_QUEUE_DEVICE_HIGH 0x0a4
+
+// Status Bits
+#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
+#define VIRTIO_CONFIG_S_DRIVER 2
+#define VIRTIO_CONFIG_S_DRIVER_OK 4
+#define VIRTIO_CONFIG_S_FEATURES_OK 8
+
+// Feature Bits
+#define VIRTIO_BLK_F_RO 5
+#define VIRTIO_BLK_F_SCSI 7
+#define VIRTIO_BLK_F_CONFIG_WCE 11
+#define VIRTIO_BLK_F_MQ 12
+#define VIRTIO_F_ANY_LAYOUT 27
+#define VIRTIO_RING_F_INDIRECT_DESC 28
+#define VIRTIO_RING_F_EVENT_IDX 29
+#define VIRTIO_F_VERSION_1 32
+
+// Descriptor Flags
+#define VRING_DESC_F_NEXT 1
+#define VRING_DESC_F_WRITE 2
+
+#define NUM_DESCS 8
+
+#define VIRTIO_BLK_T_IN 0
+#define VIRTIO_BLK_T_OUT 1
+
+// Device Configuration Layout (Offset 0x100)
+#define VIRTIO_MMIO_CONFIG 0x100
+
+namespace VirtIO
+{
+    struct VRingDesc
+    {
+        uint64 addr;
+        uint32 len;
+        uint16 flags;
+        uint16 next;
+    };
+
+    struct VRingAvail
+    {
+        uint16 flags;
+        uint16 idx;
+        uint16 ring[NUM_DESCS];
+    };
+
+    struct VRingUsedElem
+    {
+        uint32 id;
+        uint32 len;
+    };
+
+    struct VRingUsed
+    {
+        uint16 flags;
+        uint16 idx;
+        struct VRingUsedElem ring[NUM_DESCS];
+    };
+
+    struct __attribute__((packed)) BlockRequest
+    {
+        uint32 type; // 0=Read, 1=Write
+        uint32 reserved;
+        uint64 sector;
+    };
+
+    void init();
+    void intr();
+    void rw(int write, uint64 blockno, char *buf);
+    void test_rw();
+    void test_bio();
+}
\ No newline at end of file