[tkreuzer] 34733: - create 512 2 MB pages first, so we have a max of 1 GB available memory. This gets us much further through hardware detection. the setup screen loads and then it stops with "failed to load the ANSI codepage file"

Author: tkreuzer
Date: Thu Jul 24 05:26:15 2008
New Revision: 34733

URL: http://svn.reactos.org/svn/reactos?rev=34733&view=rev
Log:
- create 512 2 MB pages first, so we have a max of 1 GB available memory. This gets us much further through hardware detection. the setup screen loads and then it stops with "failed to load the ANSI codepage file"

Modified:
    branches/ros-amd64-bringup/reactos/boot/freeldr/freeldr/arch/amd64/arch.S

Modified: branches/ros-amd64-bringup/reactos/boot/freeldr/freeldr/arch/amd64/arch.S
URL: http://svn.reactos.org/svn/reactos/branches/ros-amd64-bringup/reactos/boot/f...
==============================================================================
--- branches/ros-amd64-bringup/reactos/boot/freeldr/freeldr/arch/amd64/arch.S [iso-8859-1] (original)
+++ branches/ros-amd64-bringup/reactos/boot/freeldr/freeldr/arch/amd64/arch.S [iso-8859-1] Thu Jul 24 05:26:15 2008
@@ -92,8 +92,8 @@

/*
- * We defines one 2MB page at the start of memory, so we can access the first 
- * 2MBs as if paging was disabled
+ * We define 512 2MB pages at the start of memory, so we can access the first 
+ * 1 GB as if paging was disabled
  */

#define PML4_PAGENUM 60 // Put it high enough so it doesn't interfere with freeldr
@@ -115,29 +115,33 @@
    xor di, di

/* One entry in the PML4 pointing to PDP */
-	mov ax, ((PDP_PAGENUM << 12) & 0xffff) | 0x00f
-	stosw
-	mov ax, (PDP_PAGENUM >> 4)
-	stosw
+	mov eax, (PDP_PAGENUM << 12) | 0x00f
+	stosd
    xor ax,ax
    mov cx, 0x07fe
    rep stosw

/* One entry in the PDP pointing to PD */
-	mov ax, ((PD_PAGENUM << 12) & 0xffff) | 0x00f
-	stosw
-	mov ax, (PD_PAGENUM >> 4)
-	stosw
-	xor ax,ax
-	mov cx, 0x07fe
-	rep stosw
-
-	/* One entry in the PD defining a 2MB page */
-	mov ax, 0x018f
-	stosw
-	xor ax,ax
-	mov cx,0x07ff
-	rep stosw
+	mov eax, (PD_PAGENUM << 12) | 0x00f
+	stosd
+
+	xor eax, eax
+	mov ecx, 0x03ff
+	rep stosd
+
+	/* 512 entries in the PD defining a 2MB page each */
+	mov ecx, 512
+	mov eax, 0x008f
+
+Bpt2:
+	mov es: [di], eax
+	mov dword ptr es: [di + 4], 0
+	add eax, 512 << 12 // add 512 4k pages
+	add di, 8
+
+	/* Loop it */
+	dec cx
+	jnz Bpt2

/* Return */
    pop es
@@ -258,6 +262,7 @@
    ret

+
 /** Some data *****************************************************************/

.code64