From 02e92021335bcc50d3f4840918b2f81b6e2d7cc1 Mon Sep 17 00:00:00 2001
From: AceVest <zhaoyanbai@126.com>
Date: Tue, 29 Jul 2014 00:36:51 +0800
Subject: [PATCH] success on qemu

---
 kernel/syscall.c |  6 +++++-
 mm/page.c        | 12 ++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/kernel/syscall.c b/kernel/syscall.c
index a864bad..c60d5ac 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -59,7 +59,11 @@ int sysc_test()
 int sysc_debug(unsigned int v)
 {
     static unsigned int cnt=0;
-    printl(MPL_DEBUG, "Task Debug Syscall %u Value %08x", cnt++, v);
+#if 1
+    printl(MPL_DEBUG, "task debug syscall %u", cnt++);
+#else
+    printl(MPL_DEBUG, "task debug syscall %u value %08x", cnt++, v);
+#endif
 }
 
 void init_sysc_handler_table()
diff --git a/mm/page.c b/mm/page.c
index 3b1b869..22ecae8 100644
--- a/mm/page.c
+++ b/mm/page.c
@@ -79,6 +79,10 @@ void do_no_page(void *addr)
 void do_wp_page(void *addr)
 {
     printk("%s   addr %08x\n", __func__, (unsigned long)addr);
+    if((unsigned long) addr >= PAGE_OFFSET)
+    {
+        panic("%s invalid addr", __func__);
+    }
 #if 1
     int npde = get_npd(addr);
     int npte = get_npt(addr);
@@ -86,6 +90,9 @@ void do_wp_page(void *addr)
     pde_t *page_dir = (pde_t *)current->cr3;
     pte_t *page_tbl = pa2va(PAGE_ALIGN(page_dir[npde]));
 
+    //printk("%s   addr %08x dirent %08x\n", __func__, (unsigned long)addr, page_dir[npde]);
+    //assert(page_dir[npde] != 0);
+
     unsigned long wp_pa_addr = PAGE_ALIGN(page_tbl[npte]);
    
     page_t *page = pa2page(wp_pa_addr);
@@ -104,6 +111,11 @@ void do_wp_page(void *addr)
     }
 
     page_tbl[npte] |= PAGE_WR;
+#if 0
+    page_tbl[npte] |= PAGE_US;
+    page_dir[npde] |= PAGE_WR;
+    page_dir[npde] |= PAGE_US;
+#endif
 
     load_cr3(current);
 
-- 
2.44.0