Changeset 610 for trunk/kernel/mm/vmm.c

Timestamp:

Dec 27, 2018, 7:38:58 PM (6 years ago)

Author:

alain

Message:

Fix several bugs in VFS to support the following
ksh commandis : cp, mv, rm, mkdir, cd, pwd

File:

• trunk/kernel/mm/vmm.c (modified) (5 diffs)

trunk/kernel/mm/vmm.c

@@ -1444 +1444 @@
 #endif
 
-    // compute target cluster
     page_t     * page_ptr;
     cxy_t        page_cxy;
@@ -1611 +1610 @@
 #if (DEBUG_VMM_GET_ONE_PPN & 0x1)
 if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() )
-printk("\n[%s] thread[%x,%x] for vpn  %x / both mapper & BSS\n",
+printk("\n[%s] thread[%x,%x] for vpn  %x / both mapper & BSS\n"
 "      %d bytes from mapper / %d bytes from BSS\n",
 __FUNCTION__, this->process->pid, this->trdid, vpn,
@@ -1674 +1673 @@
                           (intptr_t)vpn<<CONFIG_PPM_PAGE_SHIFT,
                           &vseg );
-
     if( error )
     {
@@ -1933 +1931 @@
 #endif
 
+    // access local GPT to get GPT_COW flag
+    bool_t cow = hal_gpt_pte_is_cow( &(process->vmm.gpt), vpn );
+
+    if( cow == false ) return EXCP_USER_ERROR;
+
     // get local vseg
     error = vmm_get_vseg( process, 
                           (intptr_t)vpn<<CONFIG_PPM_PAGE_SHIFT,
                           &vseg );
-
     if( error )
     {
@@ -1950 +1952 @@
     ref_ptr = GET_PTR( process->ref_xp );
 
-    // build relevant extended pointers on  GPT and  GPT lock
+    // build relevant extended pointers on  relevant GPT and  GPT lock
     // - access local GPT for a private vseg  
     // - access reference GPT for a public vseg