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, 0 insertions, 382 deletions

diff --git a/src/drivers/virtio_dist.cc b/src/drivers/virtio_dist.cc
deleted file mode 100644
index 8292874..0000000
--- a/src/drivers/virtio_dist.cc
+++ /dev/null
@@ -1,382 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2026 Richard QIn
- */
-#include "drivers/virtio.h"
-#include "kernel/fdt.h"
-#include "kernel/riscv.h"
-#include "kernel/pmm.h"
-#include "kernel/spinlock.h"
-#include "lib/string.h"
-#include "drivers/uart.h"
-#include "kernel/proc.h"
-#include "kernel/buf.h"
-
-static uint64 virtio_base = 0x10001000;
-
-// VirtIO Block Device Config Structure
-struct virtio_blk_config
-{
-    uint64 capacity;
-    uint32 size_max;
-    uint32 seg_max;
-    struct virtio_blk_geometry
-    {
-        uint16 cylinders;
-        uint8 heads;
-        uint8 sectors;
-    } geometry;
-    uint32 blk_size;
-    uint8 physical_block_exp;
-    uint8 alignment_offset;
-    uint16 min_io_size;
-    uint32 opt_io_size;
-} __attribute__((packed));
-
-static inline volatile uint32 *REG(uint32 offset)
-{
-    return reinterpret_cast<volatile uint32 *>(virtio_base + offset);
-}
-
-namespace VirtIO
-{
-    struct Disk
-    {
-        struct VRingDesc *desc;
-        struct VRingAvail *avail;
-        struct VRingUsed *used;
-
-        int free_head;
-        int num_free;
-        int free_chain[NUM_DESCS];
-
-        uint16 used_idx;
-
-        struct TraceInfo
-        {
-            int busy;
-            int status;
-        } info[NUM_DESCS];
-
-        struct BlockRequest reqs[NUM_DESCS];
-        uint8 req_status[NUM_DESCS];
-
-        Spinlock lock;
-    } disk;
-
-    void init()
-    {
-        disk.lock.init("virtio_disk");
-
-        // 1. Probe VirtIO devices discovered by FDT
-        bool found = false;
-        for (int i = 0; i < g_devices.virtio_count; i++)
-        {
-            uint64 addr = g_devices.virtio[i].base_addr;
-            if (addr == 0)
-                continue;
-
-            volatile uint32 *magic = (volatile uint32 *)(addr + VIRTIO_MMIO_MAGIC_VALUE);
-            volatile uint32 *dev_id = (volatile uint32 *)(addr + VIRTIO_MMIO_DEVICE_ID);
-
-            if (*magic == 0x74726976 && *dev_id == 2) // ID 2 = Block Device
-            {
-                virtio_base = addr;
-                found = true;
-                Drivers::uart_puts(ANSI_GREEN "[VirtIO] Found Block Device @ ");
-                Drivers::print_hex(addr);
-                Drivers::uart_puts(ANSI_RESET "\n");
-                break;
-            }
-        }
-
-        if (!found)
-        {
-            Drivers::uart_puts(ANSI_RED "[VirtIO] Fatal - No Block Device found.\n" ANSI_RESET);
-            return;
-        }
-
-        // 2. Check Device Version (We want Modern v2)
-        if (*REG(VIRTIO_MMIO_VERSION) != 2)
-        {
-            Drivers::uart_puts(ANSI_YELLOW "[VirtIO] Warning: Legacy device detected (expected v2).\n" ANSI_RESET);
-        }
-
-        // 3. Reset Device
-        *REG(VIRTIO_MMIO_STATUS) = 0;
-
-        // 4. Set ACKNOWLEDGE & DRIVER status
-        uint32 status = *REG(VIRTIO_MMIO_STATUS);
-        status |= VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER;
-        *REG(VIRTIO_MMIO_STATUS) = status;
-
-        // 5. Feature Negotiation
-        *REG(VIRTIO_MMIO_DEVICE_FEATURES_SEL) = 0;
-        uint32 device_features_lo = *REG(VIRTIO_MMIO_DEVICE_FEATURES);
-        (void)device_features_lo;
-
-        *REG(VIRTIO_MMIO_DEVICE_FEATURES_SEL) = 1;
-        uint32 device_features_hi = *REG(VIRTIO_MMIO_DEVICE_FEATURES);
-        (void)device_features_hi;
-
-        *REG(VIRTIO_MMIO_DRIVER_FEATURES_SEL) = 0;
-        *REG(VIRTIO_MMIO_DRIVER_FEATURES) = 0;
-
-        *REG(VIRTIO_MMIO_DRIVER_FEATURES_SEL) = 1;
-        // VIRTIO_F_VERSION_1 is usually bit 32.
-        // If not defined in header, we hardcode logic here: (1ULL << 0) for high bits
-        *REG(VIRTIO_MMIO_DRIVER_FEATURES) = 1;
-
-        status |= VIRTIO_CONFIG_S_FEATURES_OK;
-        *REG(VIRTIO_MMIO_STATUS) = status;
-
-        if (!(*REG(VIRTIO_MMIO_STATUS) & VIRTIO_CONFIG_S_FEATURES_OK))
-        {
-            Drivers::uart_puts("VirtIO: Feature negotiation failed.\n");
-            return;
-        }
-
-        // 6. Queue Configuration
-        *REG(VIRTIO_MMIO_QUEUE_SEL) = 0;
-        if (*REG(VIRTIO_MMIO_QUEUE_READY))
-        {
-            Drivers::uart_puts("VirtIO: Queue 0 not ready.\n");
-        }
-
-        uint32 max_queue = *REG(VIRTIO_MMIO_QUEUE_NUM_MAX);
-        if (max_queue < NUM_DESCS)
-        {
-            Drivers::uart_puts("VirtIO: Queue size too small.\n");
-            return;
-        }
-
-        *REG(VIRTIO_MMIO_QUEUE_NUM) = NUM_DESCS;
-
-        // Allocate Memory for VirtQueues
-        void *ptr = PMM::alloc_pages(1); // 4KB is enough for small rings
-        memset(ptr, 0, PGSIZE);
-
-        uint64 base_addr = (uint64)ptr;
-        disk.desc = reinterpret_cast<struct VRingDesc *>(base_addr);
-        disk.avail = reinterpret_cast<struct VRingAvail *>(base_addr + NUM_DESCS * 16);
-        disk.used = reinterpret_cast<struct VRingUsed *>(base_addr + PGSIZE / 2);
-
-        *REG(VIRTIO_MMIO_QUEUE_DESC_LOW) = (uint32)base_addr;
-        *REG(VIRTIO_MMIO_QUEUE_DESC_HIGH) = (uint32)(base_addr >> 32);
-
-        uint64 avail_addr = (uint64)disk.avail;
-        *REG(VIRTIO_MMIO_QUEUE_DRIVER_LOW) = (uint32)avail_addr;
-        *REG(VIRTIO_MMIO_QUEUE_DRIVER_HIGH) = (uint32)(avail_addr >> 32);
-
-        uint64 used_addr = (uint64)disk.used;
-        *REG(VIRTIO_MMIO_QUEUE_DEVICE_LOW) = (uint32)used_addr;
-        *REG(VIRTIO_MMIO_QUEUE_DEVICE_HIGH) = (uint32)(used_addr >> 32);
-
-        *REG(VIRTIO_MMIO_QUEUE_READY) = 1;
-
-        // 7. Initialize Internal Structures
-        disk.free_head = 0;
-        disk.num_free = NUM_DESCS;
-        disk.used_idx = 0;
-        for (int i = 0; i < NUM_DESCS; i++)
-        {
-            disk.free_chain[i] = i + 1;
-            disk.info[i].busy = 0;
-        }
-
-        // 8. Finalize Setup
-        status |= VIRTIO_CONFIG_S_DRIVER_OK;
-        *REG(VIRTIO_MMIO_STATUS) = status;
-
-        // === [Feature] Read Capacity ===
-        volatile struct virtio_blk_config *config = (volatile struct virtio_blk_config *)(virtio_base + VIRTIO_MMIO_CONFIG);
-        uint64 capacity_sectors = config->capacity;
-        uint64 size_mb = (capacity_sectors * 512) / (1024 * 1024);
-
-        Drivers::uart_puts(ANSI_GREEN "[VirtIO] Initialized. Capacity: ");
-        Drivers::uart_put_int(size_mb);
-        Drivers::uart_puts(" MB\n" ANSI_RESET);
-    }
-
-    static int alloc_desc()
-    {
-        if (disk.num_free == 0)
-            return -1;
-        int id = disk.free_head;
-        disk.free_head = disk.free_chain[id];
-        disk.num_free--;
-        return id;
-    }
-
-    static void free_desc(int id)
-    {
-        disk.free_chain[id] = disk.free_head;
-        disk.free_head = id;
-        disk.num_free++;
-        ProcManager::wakeup(&disk.free_head);
-    }
-
-    static void free_chain_soft(int head_idx)
-    {
-        int curr = head_idx;
-        while (1)
-        {
-            int flag = disk.desc[curr].flags;
-            int next = disk.desc[curr].next;
-            free_desc(curr);
-            if (flag & VRING_DESC_F_NEXT)
-                curr = next;
-            else
-                break;
-        }
-    }
-
-    void rw(int write, uint64 blockno, char *buf)
-    {
-        uint64 sector = blockno * (1024 / 512); // Assume 1KB blocks
-
-        disk.lock.acquire();
-
-        // Wait for enough descriptors
-        while (disk.num_free < 3)
-        {
-            ProcManager::sleep(&disk.free_head, &disk.lock);
-        }
-
-        int idx[3];
-        idx[0] = alloc_desc();
-        idx[1] = alloc_desc();
-        idx[2] = alloc_desc();
-
-        // 1. Request Header
-        struct BlockRequest *req = &disk.reqs[idx[0]];
-        req->type = write ? VIRTIO_BLK_T_OUT : VIRTIO_BLK_T_IN;
-        req->reserved = 0;
-        req->sector = sector;
-
-        disk.desc[idx[0]].addr = (uint64)req;
-        disk.desc[idx[0]].len = sizeof(struct BlockRequest);
-        disk.desc[idx[0]].flags = VRING_DESC_F_NEXT;
-        disk.desc[idx[0]].next = idx[1];
-
-        // 2. Data Buffer
-        disk.desc[idx[1]].addr = (uint64)buf;
-        disk.desc[idx[1]].len = 1024; // Fixed 1KB for this test
-        disk.desc[idx[1]].flags = VRING_DESC_F_NEXT;
-        if (!write)
-            disk.desc[idx[1]].flags |= VRING_DESC_F_WRITE;
-        disk.desc[idx[1]].next = idx[2];
-
-        // 3. Status Byte
-        disk.desc[idx[2]].addr = (uint64)&disk.req_status[idx[0]];
-        disk.desc[idx[2]].len = 1;
-        disk.desc[idx[2]].flags = VRING_DESC_F_WRITE;
-        disk.desc[idx[2]].next = 0;
-
-        disk.info[idx[0]].busy = 1;
-
-        // Submit to Avail Ring
-        disk.avail->ring[disk.avail->idx % NUM_DESCS] = idx[0];
-        __sync_synchronize();
-        disk.avail->idx++;
-        __sync_synchronize();
-
-        // Notify Device
-        *REG(VIRTIO_MMIO_QUEUE_NOTIFY) = 0;
-
-        // Wait for Completion
-        while (disk.info[idx[0]].busy)
-        {
-            ProcManager::sleep(&disk.info[idx[0]], &disk.lock);
-        }
-
-        free_chain_soft(idx[0]);
-        disk.lock.release();
-    }
-
-    void intr()
-    {
-        disk.lock.acquire();
-
-        uint32 status = *REG(VIRTIO_MMIO_INTERRUPT_STATUS);
-        *REG(VIRTIO_MMIO_INTERRUPT_ACK) = status & 0x3;
-
-        volatile struct VRingUsed *used_ring = (volatile struct VRingUsed *)disk.used;
-
-        while (disk.used_idx != used_ring->idx)
-        {
-            int id = used_ring->ring[disk.used_idx % NUM_DESCS].id;
-
-            if (disk.info[id].busy)
-            {
-                disk.info[id].busy = 0;
-                ProcManager::wakeup(&disk.info[id]);
-            }
-            disk.used_idx++;
-        }
-
-        disk.lock.release();
-    }
-
-    void test_rw()
-    {
-        Drivers::uart_puts(ANSI_BLUE "[VirtIO] Disk Test Start...\n" ANSI_RESET);
-
-        char *buf = (char *)PMM::alloc_page();
-        if (!buf)
-            return;
-
-        const char *msg = "Lume OS Disk Driver Test Pattern";
-        strcpy(buf, msg);
-
-        rw(1, 0, buf); // Write
-        memset(buf, 0, PGSIZE);
-        rw(0, 0, buf); // Read
-
-        if (strcmp(buf, msg) == 0)
-        {
-            Drivers::uart_puts(ANSI_GREEN "[VirtIO] Test PASSED (R/W Verified).\n" ANSI_RESET);
-        }
-        else
-        {
-            Drivers::uart_puts(ANSI_RED "[VirtIO] Test FAILED.\n" ANSI_RESET);
-        }
-
-        PMM::free_page(buf);
-    }
-
-    void test_bio()
-    {
-        Drivers::uart_puts(ANSI_BLUE "[Bio] Starting Buffer Cache Test...\n" ANSI_RESET);
-
-        struct Buf *b = BufferCache::bread(0, 100);
-
-        Drivers::uart_puts("[Bio] Bread block 100 (1st time).\n");
-
-        b->data[0] = 'L';
-        b->data[1] = 'u';
-        b->data[2] = 'm';
-        b->data[3] = 'e';
-        b->data[4] = '\0';
-
-        BufferCache::bwrite(b);
-        Drivers::uart_puts("[Bio] Bwrite block 100.\n");
-
-        BufferCache::brelse(b);
-        Drivers::uart_puts("[Bio] Brelease block 100.\n");
-
-        struct Buf *b2 = BufferCache::bread(0, 100);
-        Drivers::uart_puts("[Bio] Bread block 100 (2nd time).\n");
-
-        if (b2->data[0] == 'L' && b2->data[1] == 'u' && b2->data[3] == 'e')
-        {
-            Drivers::uart_puts(ANSI_GREEN "[Bio] Data verification PASSED.\n" ANSI_RESET);
-        }
-        else
-        {
-            Drivers::uart_puts(ANSI_RED "[Bio] Data verification FAILED.\n" ANSI_RESET);
-        }
-
-        BufferCache::brelse(b2);
-    }
-}
\ No newline at end of file