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, 459 deletions

diff --git a/src/kernel/mm/vm.cc b/src/kernel/mm/vm.cc
deleted file mode 100644
index be2f2f2..0000000
--- a/src/kernel/mm/vm.cc
+++ /dev/null
@@ -1,459 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2026 Richard QIn
- */
-#include "kernel/mm.h"
-#include "kernel/pmm.h"
-#include "kernel/riscv.h"
-#include "common/types.h"
-#include "lib/string.h"
-#include "drivers/uart.h"
-#include "kernel/fdt.h"
-
-extern "C"
-{
-    extern char kernel_end[];
-    extern char trampoline[];
-}
-
-namespace VM
-{
-
-    uint64 *kernel_pagetable;
-
-    static void page_ref_inc(uint64 pa)
-    {
-        struct Page *p = PMM::pa_to_page(pa);
-        if (p)
-        {
-            __atomic_add_fetch(&p->refcnt, 1, __ATOMIC_RELAXED);
-        }
-    }
-
-    static bool page_ref_dec(uint64 pa)
-    {
-        struct Page *p = PMM::pa_to_page(pa);
-        if (p)
-        {
-            if (__atomic_sub_fetch(&p->refcnt, 1, __ATOMIC_RELEASE) == 0)
-            {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    static uint64 *walk(uint64 *pagetable, uint64 va, int alloc)
-    {
-        if (va >= MAXVA)
-            return nullptr;
-
-        for (int level = 2; level > 0; level--)
-        {
-            uint64 *pte = &pagetable[PX(level, va)];
-            if (*pte & PTE_V)
-            {
-                pagetable = (uint64 *)PTE2PA(*pte);
-            }
-            else
-            {
-                if (!alloc || (pagetable = (uint64 *)PMM::alloc_page()) == nullptr)
-                    return nullptr;
-
-                memset(pagetable, 0, PGSIZE);
-                *pte = PA2PTE(pagetable) | PTE_V;
-            }
-        }
-        return &pagetable[PX(0, va)];
-    }
-
-    int mappages(uint64 *pagetable, uint64 va, uint64 size, uint64 pa, int perm)
-    {
-        uint64 a, last;
-        uint64 *pte;
-
-        if (size == 0)
-            return -1;
-
-        a = PGROUNDDOWN(va);
-        last = PGROUNDDOWN(va + size - 1);
-
-        for (;;)
-        {
-            if ((pte = walk(pagetable, a, 1)) == nullptr)
-                return -1;
-
-            if (*pte & PTE_V)
-            {
-                return -1;
-            }
-
-            *pte = PA2PTE(pa) | perm | PTE_V;
-
-            if (a == last)
-                break;
-            a += PGSIZE;
-            pa += PGSIZE;
-        }
-        return 0;
-    }
-
-    uint64 *uvmcreate()
-    {
-        uint64 *pagetable = (uint64 *)PMM::alloc_page();
-        if (pagetable)
-        {
-            memset(pagetable, 0, PGSIZE);
-
-            if (mappages(pagetable, TRAMPOLINE, PGSIZE, (uint64)trampoline, PTE_R | PTE_X) < 0)
-            {
-                PMM::free_page(pagetable);
-                return nullptr;
-            }
-        }
-        return pagetable;
-    }
-
-    void uvminit(uint64 *pagetable, uchar *src, uint64 sz)
-    {
-        char *mem;
-
-        if (sz >= PGSIZE)
-        {
-            Drivers::uart_puts("uvminit: initcode too big!\n");
-            return;
-        }
-
-        mem = (char *)PMM::alloc_page();
-        memset(mem, 0, PGSIZE);
-
-        mappages(pagetable, 0, PGSIZE, (uint64)mem, PTE_W | PTE_R | PTE_X | PTE_U);
-        memmove(mem, src, sz);
-    }
-
-    uint64 uvmalloc(uint64 *pagetable, uint64 oldsz, uint64 newsz, int xperm)
-    {
-        char *mem;
-        uint64 a;
-
-        if (newsz < oldsz)
-            return oldsz;
-
-        oldsz = PGROUNDUP(oldsz);
-        for (a = oldsz; a < newsz; a += PGSIZE)
-        {
-            mem = (char *)PMM::alloc_page();
-            if (mem == nullptr)
-            {
-                uvmdealloc(pagetable, a, oldsz);
-                return 0;
-            }
-            memset(mem, 0, PGSIZE);
-            if (mappages(pagetable, a, PGSIZE, (uint64)mem, PTE_R | PTE_U | xperm) != 0)
-            {
-                PMM::free_page(mem);
-                uvmdealloc(pagetable, a, oldsz);
-                return 0;
-            }
-        }
-        return newsz;
-    }
-
-    uint64 uvmdealloc(uint64 *pagetable, uint64 oldsz, uint64 newsz)
-    {
-        if (newsz >= oldsz)
-            return oldsz;
-
-        if (PGROUNDUP(newsz) < PGROUNDUP(oldsz))
-        {
-            int npages = (PGROUNDUP(oldsz) - PGROUNDUP(newsz)) / PGSIZE;
-            uvmunmap(pagetable, PGROUNDUP(newsz), npages, 1);
-        }
-
-        return newsz;
-    }
-
-    void uvmunmap(uint64 *pagetable, uint64 va, uint64 npages, int do_free)
-    {
-        uint64 a;
-        uint64 *pte;
-
-        if ((va % PGSIZE) != 0)
-            return;
-
-        for (a = va; a < va + npages * PGSIZE; a += PGSIZE)
-        {
-            if ((pte = walk(pagetable, a, 0)) == nullptr)
-                continue;
-
-            if ((*pte & PTE_V) == 0)
-                continue;
-
-            if ((PTE_FLAGS(*pte) & (PTE_R | PTE_W | PTE_X)) == 0)
-            {
-                continue;
-            }
-
-            if (do_free)
-            {
-                uint64 pa = PTE2PA(*pte);
-                if (page_ref_dec(pa))
-                {
-                    PMM::free_page((void *)pa);
-                }
-            }
-            *pte = 0;
-        }
-    }
-
-    static void freewalk(uint64 *pagetable)
-    {
-        for (int i = 0; i < 512; i++)
-        {
-            uint64 pte = pagetable[i];
-            if ((pte & PTE_V) && (pte & (PTE_R | PTE_W | PTE_X)) == 0)
-            {
-                uint64 *child = (uint64 *)PTE2PA(pte);
-                freewalk(child);
-                pagetable[i] = 0;
-            }
-        }
-        PMM::free_page(pagetable);
-    }
-
-    void uvmfree(uint64 *pagetable, uint64 sz)
-    {
-        if (sz > 0)
-            uvmunmap(pagetable, 0, PGROUNDUP(sz) / PGSIZE, 1);
-        freewalk(pagetable);
-    }
-
-    int uvmcopy(uint64 *oldpt, uint64 *newpt, uint64 sz)
-    {
-        uint64 *pte;
-        uint64 pa, i;
-        uint flags;
-
-        for (i = 0; i < sz; i += PGSIZE)
-        {
-            if ((pte = walk(oldpt, i, 0)) == nullptr)
-                continue;
-            if ((*pte & PTE_V) == 0)
-                continue;
-
-            pa = PTE2PA(*pte);
-            flags = PTE_FLAGS(*pte);
-
-            if (flags & PTE_W)
-            {
-                flags &= ~PTE_W;
-                flags |= PTE_COW;
-                *pte = PA2PTE(pa) | flags;
-            }
-
-            if (mappages(newpt, i, PGSIZE, pa, flags) != 0)
-            {
-                return -1;
-            }
-
-            page_ref_inc(pa);
-        }
-
-        sfence_vma();
-        return 0;
-    }
-
-    int handle_cow_fault(uint64 *pagetable, uint64 va);
-
-    int copyout(uint64 *pagetable, uint64 dstva, char *src, uint64 len)
-    {
-        uint64 n, va0, pa0;
-        uint64 *pte;
-
-        while (len > 0)
-        {
-            va0 = PGROUNDDOWN(dstva);
-            pte = walk(pagetable, va0, 0);
-            if (pte == nullptr || (*pte & PTE_V) == 0 || (*pte & PTE_U) == 0)
-                return -1;
-
-            // Note: Maybe a bug
-            if (*pte & PTE_COW)
-            {
-                if (handle_cow_fault(pagetable, va0) < 0)
-                    return -1;
-                // Re-walk because handle_cow_fault replaced the page mapping
-                pte = walk(pagetable, va0, 0);
-                if (pte == nullptr || (*pte & PTE_V) == 0 || (*pte & PTE_U) == 0)
-                    return -1;
-            }
-
-            pa0 = PTE2PA(*pte);
-            n = PGSIZE - (dstva - va0);
-            if (n > len)
-                n = len;
-
-            memmove((void *)(pa0 + (dstva - va0)), src, n);
-
-            len -= n;
-            src += n;
-            dstva = va0 + PGSIZE;
-        }
-        return 0;
-    }
-
-    int copyin(uint64 *pagetable, char *dst, uint64 srcva, uint64 len)
-    {
-        uint64 n, va0, pa0;
-        uint64 *pte;
-
-        while (len > 0)
-        {
-            va0 = PGROUNDDOWN(srcva);
-            pte = walk(pagetable, va0, 0);
-            if (pte == nullptr || (*pte & PTE_V) == 0 || (*pte & PTE_U) == 0)
-                return -1;
-
-            pa0 = PTE2PA(*pte);
-            n = PGSIZE - (srcva - va0);
-            if (n > len)
-                n = len;
-
-            memmove(dst, (void *)(pa0 + (srcva - va0)), n);
-
-            len -= n;
-            dst += n;
-            srcva = va0 + PGSIZE;
-        }
-        return 0;
-    }
-
-    int copyinstr(uint64 *pagetable, char *dst, uint64 srcva, uint64 max)
-    {
-        uint64 n, va0, pa0;
-        uint64 *pte;
-        int got_null = 0;
-        uint64 len = 0;
-
-        while (len < max)
-        {
-            va0 = PGROUNDDOWN(srcva);
-            pte = walk(pagetable, va0, 0);
-
-            if (pte == nullptr || (*pte & PTE_V) == 0 || (*pte & PTE_U) == 0)
-                return -1;
-
-            pa0 = PTE2PA(*pte);
-
-            n = PGSIZE - (srcva - va0);
-            if (n > max - len)
-                n = max - len;
-
-            char *p = (char *)(pa0 + (srcva - va0));
-            while (n > 0)
-            {
-                if (*p == '\0')
-                {
-                    *dst = '\0';
-                    got_null = 1;
-                    break;
-                }
-                *dst = *p;
-                n--;
-                srcva++;
-                dst++;
-                p++;
-                len++;
-            }
-            if (got_null)
-                break;
-        }
-
-        if (got_null)
-            return 0;
-
-        return -1;
-    }
-
-    int handle_cow_fault(uint64 *pagetable, uint64 va)
-    {
-        if (va >= MAXVA)
-            return -1;
-
-        uint64 *pte = walk(pagetable, va, 0);
-        if (pte == nullptr || (*pte & PTE_V) == 0 || (*pte & PTE_U) == 0)
-            return -1;
-
-        if ((*pte & PTE_COW) == 0)
-            return -1;
-
-        uint64 pa = PTE2PA(*pte);
-        uint64 flags = PTE_FLAGS(*pte);
-
-        char *mem = (char *)PMM::alloc_page();
-        if (mem == nullptr)
-            return -1;
-
-        memmove(mem, (char *)pa, PGSIZE);
-
-        uint64 new_flags = (flags | PTE_W) & ~PTE_COW;
-        *pte = PA2PTE((uint64)mem) | new_flags | PTE_V;
-
-        if (page_ref_dec(pa))
-        {
-            PMM::free_page((void *)pa);
-        }
-
-        sfence_vma();
-        return 0;
-    }
-
-    static void kvmmap(uint64 va, uint64 pa, uint64 sz, int perm)
-    {
-        if (mappages(kernel_pagetable, va, sz, pa, perm) != 0)
-        {
-            Drivers::uart_puts("kvmmap: failed\n");
-            while (1)
-                ;
-        }
-    }
-
-    void kvminit()
-    {
-        kernel_pagetable = uvmcreate();
-
-        // 1. Map all device MMIO regions discovered by FDT
-        for (int i = 0; i < g_devices.mmio_count; i++)
-        {
-            uint64 base = g_devices.mmio_regions[i].base;
-            uint64 size = g_devices.mmio_regions[i].size;
-            kvmmap(base, base, size, PTE_R | PTE_W);
-        }
-
-        // 2. Map Kernel Memory (PHYSTOP is now dynamic based on FDT)
-        kvmmap(KERNBASE, KERNBASE, PHYSTOP - KERNBASE, PTE_R | PTE_W | PTE_X);
-    }
-
-    void kvminithart()
-    {
-        w_satp(MAKE_SATP(kernel_pagetable));
-        sfence_vma();
-        Drivers::uart_puts("[Boot] MMU ENABLED! Using virtual addresses.\n");
-    }
-
-    uint64 walkaddr(uint64 *pagetable, uint64 va)
-    {
-        uint64 *pte;
-        uint64 pa;
-
-        if (va >= MAXVA)
-            return 0;
-
-        pte = walk(pagetable, va, 0);
-        if (pte == 0 || (*pte & PTE_V) == 0 || (*pte & PTE_U) == 0)
-            return 0;
-
-        pa = PTE2PA(*pte);
-        return pa;
-    }
-}
\ No newline at end of file