import RT-Thread@9217865c without bsp, libcpu and components/net

components/mm/mm_object.c

@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-11-30     WangXiaoyao  the first version
+ */
+
+#include <rtthread.h>
+
+#include "mm_aspace.h"
+#include "mm_fault.h"
+#include "mm_page.h"
+#include <mmu.h>
+
+#define DBG_TAG "mm.object"
+#define DBG_LVL DBG_INFO
+#include "rtdbg.h"
+
+static const char *get_name(rt_varea_t varea)
+{
+    return "dummy-mapper";
+}
+
+void rt_varea_pgmgr_insert(rt_varea_t varea, void *page_addr)
+{
+    rt_page_t page = rt_page_addr2page(page_addr);
+
+    if (varea->frames == NULL)
+    {
+        varea->frames = page;
+        page->next = NULL;
+    }
+    else
+    {
+        varea->frames->pre = page;
+        page->next = varea->frames;
+        varea->frames = page;
+    }
+}
+
+void rt_varea_pgmgr_pop_all(rt_varea_t varea)
+{
+    rt_page_t page = varea->frames;
+
+    while (page)
+    {
+        rt_page_t next = page->next;
+        void *pg_va = rt_page_page2addr(page);
+        rt_pages_free(pg_va, 0);
+        page = next;
+    }
+}
+
+void rt_varea_pgmgr_pop(rt_varea_t varea, void *vaddr, rt_size_t size)
+{
+    void *vend = (char *)vaddr + size;
+    while (vaddr != vend)
+    {
+        rt_page_t page = rt_page_addr2page(vaddr);
+        page->pre->next = page->next;
+        page->next->pre = page->pre;
+        rt_pages_free(vaddr, 0);
+        vaddr = (char *)vaddr + ARCH_PAGE_SIZE;
+    }
+}
+
+static void on_page_fault(struct rt_varea *varea, struct rt_aspace_fault_msg *msg)
+{
+    void *page;
+    page = rt_pages_alloc_ext(0, PAGE_ANY_AVAILABLE);
+
+    if (!page)
+    {
+        LOG_W("%s: page alloc failed", __func__);
+        return;
+    }
+
+    msg->response.status = MM_FAULT_STATUS_OK;
+    msg->response.size = ARCH_PAGE_SIZE;
+    msg->response.vaddr = page;
+
+    rt_varea_pgmgr_insert(varea, page);
+}
+
+static void on_varea_open(struct rt_varea *varea)
+{
+    varea->data = NULL;
+}
+
+static void on_varea_close(struct rt_varea *varea)
+{
+}
+
+static void on_page_offload(rt_varea_t varea, void *vaddr, rt_size_t size)
+{
+    rt_varea_pgmgr_pop(varea, vaddr, size);
+}
+
+struct rt_mem_obj rt_mm_dummy_mapper = {
+    .get_name = get_name,
+    .on_page_fault = on_page_fault,
+    .hint_free = NULL,
+    .on_varea_open = on_varea_open,
+    .on_varea_close = on_varea_close,
+    .on_page_offload = on_page_offload,
+};