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.

3 files changed, 0 insertions, 408 deletions

diff --git a/src/kernel/trap/handler.cc b/src/kernel/trap/handler.cc
deleted file mode 100644
index b7bd5f0..0000000
--- a/src/kernel/trap/handler.cc
+++ /dev/null
@@ -1,217 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2026 Richard QIn
- */
-#include "kernel/trap.h"
-#include "kernel/riscv.h"
-#include "kernel/proc.h"
-#include "drivers/uart.h"
-#include "kernel/syscall.h"
-#include "kernel/mm.h"
-#include "kernel/timer.h"
-#include "drivers/plic.h"
-#include "drivers/virtio.h"
-#include "kernel/fdt.h"
-#include "lib/string.h"
-
-
-extern "C" void kernelvec();
-
-// Handle Function
-
-void panic(const char *s)
-{
-    Drivers::uart_puts("\n\n!!! KERNEL PANIC !!!\n");
-    Drivers::uart_puts(s);
-    Drivers::uart_puts("\nSystem Halted.\n");
-    while (1)
-        ;
-}
-
-// Trap Implementation
-
-namespace Trap
-{
-    void init()
-    {
-        Drivers::uart_puts("[Trap] Global init done.\n");
-    }
-
-    // Each CPU core needs to call this function when starting to set its own stvec
-    void inithart()
-    {
-        w_stvec((uint64)kernelvec);
-
-        // Ensure that the S-Mode interrupt enable bit (SIE) is cleared during initialization
-        // Interrupt enabling will be done by the scheduler when the first process runs
-        w_sstatus(r_sstatus() & ~SSTATUS_SIE);
-
-        // Enable the external interrupt, clock interrupt, and software interrupt bits in S-Mode (in SIE register)
-        uint64 sie = r_sie();
-        sie |= SIE_SEIE | SIE_STIE | SIE_SSIE;
-        w_sie(sie);
-
-        Drivers::uart_puts("[Trap] Hart initialized (stvec set).\n");
-    }
-
-    // Device Interrupt Check
-    int devintr()
-    {
-        uint64 scause = r_scause();
-
-        bool is_interrupt = (scause & 0x8000000000000000L) != 0;
-        uint64 code = scause & 0xff;
-
-        if (is_interrupt && code == 9)
-        {
-            // Supervisor External Interrupt (IRQ 9)
-            int irq = PLIC::claim();
-
-            if (irq == (int)g_devices.uart.irq)
-            {
-                Drivers::uart_intr();
-            }
-            else
-            {
-                // Check if it's a VirtIO IRQ
-                bool handled = false;
-                for (int i = 0; i < g_devices.virtio_count; i++)
-                {
-                    if (irq == (int)g_devices.virtio[i].irq)
-                    {
-                        VirtIO::intr();
-                        handled = true;
-                        break;
-                    }
-                }
-            }
-
-            if (irq > 0)
-            {
-                PLIC::complete(irq);
-            }
-
-            return 1;
-        }
-        else if (is_interrupt && code == 5)
-        {
-            // Supervisor Timer Interrupt (IRQ 5)
-            // Timer::set_next_trigger();
-            Timer::tick();
-            // w_sip(r_sip() & ~2);
-            return 2;
-        }
-
-        return 0;
-    }
-}
-
-// Exception Handling Entry
-
-extern "C" void kerneltrap(struct Trapframe *tf)
-{
-    uint64 sepc = r_sepc();
-    uint64 sstatus = r_sstatus();
-    uint64 scause = r_scause();
-
-    if ((sstatus & SSTATUS_SPP) == 0)
-        panic("kerneltrap: not from supervisor mode");
-
-    if (intr_get() != 0)
-        panic("kerneltrap: interrupts enabled");
-
-    if (Trap::devintr() == 0)
-    {
-        Drivers::uart_puts("\n--- KERNEL EXCEPTION ---\n");
-        Drivers::uart_puts("scause: ");
-        Drivers::print_hex(scause);
-        Drivers::uart_puts("\n");
-        Drivers::uart_puts("sepc:   ");
-        Drivers::print_hex(sepc);
-        Drivers::uart_puts("\n");
-        Drivers::uart_puts("stval:  ");
-        Drivers::print_hex(r_stval());
-        Drivers::uart_puts("\n");
-        panic("kerneltrap exception");
-    }
-
-    w_sepc(sepc);
-    w_sstatus(sstatus);
-}
-
-extern "C" void usertrap()
-{
-    // Drivers::uart_puts("[Debug] Entered usertrap!\n");
-    int which_dev = 0;
-
-    if ((r_sstatus() & SSTATUS_SPP) != 0)
-        panic("usertrap: not from user mode");
-
-    w_stvec((uint64)kernelvec);
-
-    struct Proc *p = myproc();
-    if (!p)
-        panic("usertrap: no process");
-
-    p->tf->epc = r_sepc();
-
-    uint64 scause = r_scause();
-    uint64 stval = r_stval();
-
-    if (scause == 8) // Syscall
-    {
-        if (p->state == ZOMBIE)
-            ProcManager::exit(-1);
-        p->tf->epc += 4;
-        intr_on();
-        syscall();
-        intr_off();
-    }
-    else if (scause == 15) // Store Page Fault
-    {
-        if (VM::handle_cow_fault(p->pagetable, PGROUNDDOWN(stval)) != 0)
-        {
-            uint64 pa = VM::walkaddr(p->pagetable, stval);
-
-            if (pa == 0)
-            {
-                Drivers::uart_puts("usertrap: Segmentation Fault (unmapped) at ");
-            }
-            else
-            {
-                Drivers::uart_puts("usertrap: Protection Fault (or OOM) at ");
-            }
-
-            Drivers::print_hex(stval);
-            Drivers::uart_puts("\n");
-            p->state = ZOMBIE;
-            ProcManager::exit(-1);
-        }
-    }
-    else if ((which_dev = Trap::devintr()) != 0)
-    {
-        if (which_dev == 2)
-        {
-            ProcManager::yield();
-        }
-    }
-    else
-    {
-        Drivers::uart_puts("\nusertrap(): unexpected scause ");
-        Drivers::print_hex(scause);
-        Drivers::uart_puts(" pid=");
-        Drivers::uart_put_int(p->pid);
-        Drivers::uart_puts(" sepc=");
-        Drivers::print_hex(p->tf->epc);
-        Drivers::uart_puts(" stval=");
-        Drivers::print_hex(stval);
-        Drivers::uart_puts("\n");
-        p->state = ZOMBIE;
-        ProcManager::exit(-1);
-    }
-
-    if (p->state == ZOMBIE)
-        ProcManager::exit(-1);
-
-    usertrapret();
-}
\ No newline at end of file
diff --git a/src/kernel/trap/trampoline.S b/src/kernel/trap/trampoline.S
deleted file mode 100644
index 57d6f25..0000000
--- a/src/kernel/trap/trampoline.S
+++ /dev/null
@@ -1,101 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-or-later
-# Copyright (C) 2026 Richard Qin
-
-.section .text
-.globl trampoline
-.globl uservec
-.globl userret
-
-.align 12
-trampoline:
-.align 4
-uservec:    
-    
-    csrrw a0, sscratch, a0
-
-    sd ra, 40(a0)
-    sd sp, 48(a0)
-    sd gp, 56(a0)
-    sd tp, 64(a0)
-    sd t0, 72(a0)
-    sd t1, 80(a0)
-    sd t2, 88(a0)
-    sd s0, 96(a0)
-    sd s1, 104(a0)
-    sd a1, 120(a0)
-    sd a2, 128(a0)
-    sd a3, 136(a0)
-    sd a4, 144(a0)
-    sd a5, 152(a0)
-    sd a6, 160(a0)
-    sd a7, 168(a0)
-    sd s2, 176(a0)
-    sd s3, 184(a0)
-    sd s4, 192(a0)
-    sd s5, 200(a0)
-    sd s6, 208(a0)
-    sd s7, 216(a0)
-    sd s8, 224(a0)
-    sd s9, 232(a0)
-    sd s10, 240(a0)
-    sd s11, 248(a0)
-    sd t3, 256(a0)
-    sd t4, 264(a0)
-    sd t5, 272(a0)
-    sd t6, 280(a0)
-
-    csrr t0, sscratch
-    sd t0, 112(a0)
-
-    ld sp, 8(a0)
-    ld tp, 32(a0)
-    ld t0, 16(a0)
-    ld t1, 0(a0)
-
-    csrw satp, t1
-    sfence.vma zero, zero
-
-    jr t0
-
-.align 4
-userret:
-    
-    csrw satp, a1
-    sfence.vma zero, zero
-
-    csrw sscratch, a0
-
-    ld ra, 40(a0)
-    ld sp, 48(a0)
-    ld gp, 56(a0)
-    ld tp, 64(a0)
-    ld t0, 72(a0)
-    ld t1, 80(a0)
-    ld t2, 88(a0)
-    ld s0, 96(a0)
-    ld s1, 104(a0)
-    ld a1, 120(a0)
-    ld a2, 128(a0)
-    ld a3, 136(a0)
-    ld a4, 144(a0)
-    ld a5, 152(a0)
-    ld a6, 160(a0)
-    ld a7, 168(a0)
-    ld s2, 176(a0)
-    ld s3, 184(a0)
-    ld s4, 192(a0)
-    ld s5, 200(a0)
-    ld s6, 208(a0)
-    ld s7, 216(a0)
-    ld s8, 224(a0)
-    ld s9, 232(a0)
-    ld s10, 240(a0)
-    ld s11, 248(a0)
-    ld t3, 256(a0)
-    ld t4, 264(a0)
-    ld t5, 272(a0)
-    ld t6, 280(a0)
-    
-    ld a0, 112(a0)
-    
-    sret
\ No newline at end of file
diff --git a/src/kernel/trap/trap.S b/src/kernel/trap/trap.S
deleted file mode 100644
index 8bce53d..0000000
--- a/src/kernel/trap/trap.S
+++ /dev/null
@@ -1,90 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-or-later
-# Copyright (C) 2026 Richard Qin
-
-.section .text
-.global kernelvec
-.global uservec
-.global userret
-.align 12
-
-kernelvec:
-    addi sp, sp, -288
-    
-    sd ra, 40(sp)
-    sd sp, 48(sp)
-    sd gp, 56(sp)
-    sd tp, 64(sp)
-    sd t0, 72(sp)
-    sd t1, 80(sp)
-    sd t2, 88(sp)
-    sd s0, 96(sp)
-    sd s1, 104(sp)
-    sd a0, 112(sp)
-    sd a1, 120(sp)
-    sd a2, 128(sp)
-    sd a3, 136(sp)
-    sd a4, 144(sp)
-    sd a5, 152(sp)
-    sd a6, 160(sp)
-    sd a7, 168(sp)
-    sd s2, 176(sp)
-    sd s3, 184(sp)
-    sd s4, 192(sp)
-    sd s5, 200(sp)
-    sd s6, 208(sp)
-    sd s7, 216(sp)
-    sd s8, 224(sp)
-    sd s9, 232(sp)
-    sd s10, 240(sp)
-    sd s11, 248(sp)
-    sd t3, 256(sp)
-    sd t4, 264(sp)
-    sd t5, 272(sp)
-    sd t6, 280(sp)
-    
-    csrr t0, sepc
-    csrr t1, sstatus
-    sd t0, 24(sp)   # Trapframe.epc
-    sd t1, 32(sp)   # Trapframe.kernel_hartid
-    
-    mv a0, sp
-    call kerneltrap
-    
-    ld t0, 24(sp)
-    ld t1, 32(sp)
-    csrw sepc, t0
-    csrw sstatus, t1
-
-    ld ra, 40(sp)
-    ld gp, 56(sp)
-    ld tp, 64(sp)
-    ld t0, 72(sp)
-    ld t1, 80(sp)
-    ld t2, 88(sp)
-    ld s0, 96(sp)
-    ld s1, 104(sp)
-    ld a0, 112(sp)
-    ld a1, 120(sp)
-    ld a2, 128(sp)
-    ld a3, 136(sp)
-    ld a4, 144(sp)
-    ld a5, 152(sp)
-    ld a6, 160(sp)
-    ld a7, 168(sp)
-    ld s2, 176(sp)
-    ld s3, 184(sp)
-    ld s4, 192(sp)
-    ld s5, 200(sp)
-    ld s6, 208(sp)
-    ld s7, 216(sp)
-    ld s8, 224(sp)
-    ld s9, 232(sp)
-    ld s10, 240(sp)
-    ld s11, 248(sp)
-    ld t3, 256(sp)
-    ld t4, 264(sp)
-    ld t5, 272(sp)
-    ld t6, 280(sp)
-    
-    addi sp, sp, 288
-    sret
\ No newline at end of file