identity paging re-enabled

1 files changed, 35 insertions, 49 deletions

diff --git a/kernel/vmem.c b/kernel/vmem.c
index e700da3..ceef26d 100644
--- a/kernel/vmem.c
+++ b/kernel/vmem.c
@@ -208,68 +208,54 @@ void show_cr()
 
 }
 
-void vmem_init(uint32_t vesa_physbase)
+void vmem_init()
 {
-    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"init paging (vesa base: 0x%08x)",vesa_physbase);
+    //log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"init paging (vesa base: 0x%08x)",vesa_physbase);
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"init paging");
 
-    ptable* table1 = (ptable*) pmmngr_alloc_block ();
-
-    if (!table1)panic(FOOLOS_MODULE_NAME,"unable to alloc table1");
-    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"table1: 0x%X",table1);
- 
-    ptable* table2 = (ptable*) pmmngr_alloc_block ();
-
-    if (!table1)panic(FOOLOS_MODULE_NAME,"unable to alloc table2");
-    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"table2: 0x%X",table2);
-
-    // TODO: 3blocks? 
     pdirectory*	dir = (pdirectory*) pmmngr_alloc_block ();
     if (!dir)panic(FOOLOS_MODULE_NAME,"unable to alloc pdirectory");
     log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"pdirectory: 0x%X",dir);
 
-    //! 1st 4mb are idenitity mapped
-    for (int i=0, frame=0x0, virt=0x00000000; i<1024; i++, frame+=4096, virt+=4096) 
-    {
-	//! create a new page
-	pt_entry page=0;
-	pt_entry_add_attrib (&page, I86_PTE_PRESENT);
-	pt_entry_add_attrib (&page, I86_PTE_WRITABLE);
-	pt_entry_set_frame (&page, frame);
-
-	//! ...and add it to the page table
-	table2->m_entries [PAGE_TABLE_INDEX (virt) ] = page;
-    }
+    for(int i=0;i<1024;i++)dir->m_entries [i]=0;
 
-    //uint32_t vesa_mapped=0x1000*1024;
-    uint32_t vesa_mapped=vesa_physbase;
+    uint32_t phys_addr=0;
+    uint32_t virt_addr=0;
 
-    for (int i=0, frame=vesa_physbase, virt=vesa_mapped; i<1024; i++, frame+=4096, virt+=4096) 
+    // first 10 pages are identity mapped
+    for(int i=0;i<16;i++)
     {
 
-	//! create a new page
-	pt_entry page=0;
-	pt_entry_add_attrib (&page, I86_PTE_PRESENT);
-	pt_entry_add_attrib (&page, I86_PTE_WRITABLE);
-	pt_entry_set_frame (&page, frame);
+	ptable* table = (ptable*) pmmngr_alloc_block ();
 
-	//! ...and add it to the page table
-	table1->m_entries [PAGE_TABLE_INDEX (virt) ] = page;
-    }
-
-    for(int i=0;i<1024;i++)dir->m_entries [i]=0;
-   
-    pd_entry* entry = &dir->m_entries [PAGE_DIRECTORY_INDEX (vesa_mapped) ];
-    *entry=0;
-    pd_entry_add_attrib (entry, I86_PDE_PRESENT);
-    pd_entry_add_attrib (entry, I86_PDE_WRITABLE);
-    pd_entry_set_frame (entry, (physical_addr)table1);
+	if (!table)panic(FOOLOS_MODULE_NAME,"unable to alloc table");
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"table: 0x%X",table);
     
 
-    pd_entry* entry2 = &dir->m_entries [PAGE_DIRECTORY_INDEX (0x00000000) ];
-    *entry2=0;
-    pd_entry_add_attrib (entry2, I86_PDE_PRESENT);
-    pd_entry_add_attrib (entry2, I86_PDE_WRITABLE);
-    pd_entry_set_frame (entry2, (physical_addr)table2);
+	//! idenitity mapping
+	for (int i=0, frame=phys_addr, virt=virt_addr; i<1024; i++, frame+=4096, virt+=4096) 
+	{
+	    //! create a new page
+	    pt_entry page=0;
+	    pt_entry_add_attrib (&page, I86_PTE_PRESENT);
+	    pt_entry_add_attrib (&page, I86_PTE_WRITABLE);
+	    pt_entry_set_frame (&page, frame);
+
+	    //! ...and add it to the page table
+	    table->m_entries [PAGE_TABLE_INDEX (virt) ] = page;
+	}
+	
+	pd_entry* entry = &dir->m_entries [PAGE_DIRECTORY_INDEX (virt_addr) ];
+	*entry=0;
+	pd_entry_add_attrib (entry, I86_PDE_PRESENT);
+	pd_entry_add_attrib (entry, I86_PDE_WRITABLE);
+	pd_entry_set_frame (entry, (physical_addr)table);
+
+	phys_addr+=1024*4096;
+	virt_addr+=1024*4096;
+
+    }
+
 
     x86_set_pdbr(dir);