From: Joshua Wise <joshua@nyus.joshuawise.com>
Date: Thu, 4 Dec 2008 20:32:01 +0000 (-0500)
Subject: paging for fb
X-Git-Url: http://git.joshuawise.com/netwatch.git/commitdiff_plain/e8f20fe7be6203b50e049bbaa057acc7f0b0d593?ds=sidebyside;hp=307d9f0e590f4f2b2e1bcac37636374a334f3946

paging for fb
---

diff --git a/aseg-paging/pagingstub.c b/aseg-paging/pagingstub.c
index 7d430b9..678f2ea 100644
--- a/aseg-paging/pagingstub.c
+++ b/aseg-paging/pagingstub.c
@@ -23,14 +23,26 @@ void ps_switch_stack (void (*call)(), int stack);
         asm volatile("mov %%cr0, %0" : "=r" (_temp__)); \
         _temp__; \
     })
-
-
 #define set_cr3(value) \
     { \
         register unsigned int _temp__ = (value); \
         asm volatile("mov %0, %%cr3" : : "r" (_temp__)); \
      }
+
+#define get_cr4() \
+    ({ \
+        register unsigned int _temp__; \
+        asm volatile("mov %%cr4, %0" : "=r" (_temp__)); \
+        _temp__; \
+    })
+#define set_cr4(value) \
+    { \
+        register unsigned int _temp__ = (value); \
+        asm volatile("mov %0, %%cr4" : : "r" (_temp__)); \
+     }
+
 #define	CR0_PG	0x80000000
+#define CR4_PSE	0x00000010
 
 #define MAP_FLAGS	(PTE_PRESENT | PTE_READ_WRITE)
 
@@ -97,6 +109,15 @@ int addmap(unsigned long vaddr, unsigned long paddr)
 	return 0;
 }
 
+int addmap_4m(unsigned long vaddr, unsigned long paddr)
+{
+	/* PDE_PAGE_SIZE = (1 << 7) */
+	((unsigned long *)p2v((unsigned long)pd))[PDE_FOR(vaddr)] =
+		paddr | PDE_PRESENT | PDE_READ_WRITE | PDE_PAGE_SIZE;
+	
+	return 0;
+}
+
 void *demap(unsigned long client_pd, unsigned long vaddr)
 {
 	unsigned long pde = ((unsigned long *)p2v(client_pd))[PDE_FOR(vaddr)];
@@ -158,6 +179,7 @@ void c_entry(void)
 		
 	/* Enable paging. */
 	set_cr3((unsigned long)pd);
+	set_cr4(get_cr4() | CR4_PSE);	/* ITT, we 4MByte page. */ 
 	set_cr0(get_cr0() | CR0_PG);
 	outb(0x80, 0x03);
 	paging_enb = 1;
diff --git a/aseg-paging/smi.c b/aseg-paging/smi.c
index e1304f3..f2b574f 100644
--- a/aseg-paging/smi.c
+++ b/aseg-paging/smi.c
@@ -46,20 +46,13 @@ void smi_entry(void)
 		for (p = 0; ass[p][0] != -1; p++)
 		{
 			int x, y;
-			unsigned long lasta = 0;
-			unsigned long *lastmap;
 			for (y = 0; y < 8; y++)
 				for (x = 0; x < 8; x++)
 				{
-					unsigned long a =
-						(unsigned long) fb->fbaddr +
-						((y+ass[p][1]*8) * fb->curmode.xres + ass[p][0]*8 + x) * 4;
-					if ((a & ~4095) != (lasta & ~4095))
-					{
-						lastmap = (unsigned long *)((unsigned long)p2v(a) & ~4095);
-						lasta = a;
-					}
-					lastmap[(a & 4095) / 4] = 0xFF0000FF;
+					unsigned long *a =
+						(unsigned long*) fb->fbaddr +
+						((y+ass[p][1]*8) * fb->curmode.xres + ass[p][0]*8 + x);
+                                        *a = 0xFF0000FF;
 				}
 		}
 	}
diff --git a/include/paging.h b/include/paging.h
index 90c44e9..0f864d8 100644
--- a/include/paging.h
+++ b/include/paging.h
@@ -4,6 +4,7 @@
 extern unsigned long v2p(void *virt);
 extern void *p2v(unsigned long phys);
 extern int addmap(unsigned long vaddr, unsigned long paddr);
+extern int addmap_4m(unsigned long vaddr, unsigned long paddr);
 extern void *demap(unsigned long _pd, unsigned long vaddr);
 
 #endif
diff --git a/video/tnt2.c b/video/tnt2.c
index 5ab5f02..32e646a 100644
--- a/video/tnt2.c
+++ b/video/tnt2.c
@@ -3,6 +3,7 @@
 #include <pci.h>
 #include <output.h>
 #include <fb.h>
+#include <paging.h>
 
 static void tnt2_getvmode(void *priv);
 
@@ -39,14 +40,21 @@ static void tnt2_getvmode(void *priv)
 
 static int tnt2_probe(struct pci_dev *pci, void *data)
 {
+	unsigned int p;
+
 	if (pci->bars[1].type != PCI_BAR_MEMORY32)
 	{
 		output("TNT2 BAR1 is not memory32?");
 		return 0;
 	}
-	tnt2_fb.fbaddr = (void *)pci->bars[1].addr;
+	
+	/* Map 32M of memory. */
+	for (p = 0; p < 32; p += 4)
+		addmap_4m(0x40000000 + p*1024*1024, pci->bars[1].addr + p*1024*1024);
+	tnt2_fb.fbaddr = (void *)0x40000000;
+	
 	fb = &tnt2_fb;
-	outputf("Found TNT2 with FB at %08x", tnt2_fb.fbaddr);
+	outputf("Found TNT2 with FB at %08x, mapped to %08x", pci->bars[1].addr, tnt2_fb.fbaddr);
 	return 1;
 }