Introduce 32bit absolute DS GDT selector

Author: scopeInfinity

include/fuzzy/memmgr/tables/gdt.asm

@@ -8,7 +8,7 @@ GDT_STD_SELECTOR_KERNEL_DS  EQU     2
 GDT_STD_SELECTOR_ABS16_CS   EQU     3
 GDT_STD_SELECTOR_ABS16_DS   EQU     4
 GDT_STD_SELECTOR_ABS32_DS   EQU     6
-GDT_STD_SIZE                EQU     5 ; FIX
+GDT_STD_SIZE                EQU     7
 
 GDT_STD_SIZEOF_ENTRY        EQU     8
 ; END_ENSURE_SAME_gdt_h

include/fuzzy/memmgr/tables/gdt.h

@@ -10,7 +10,7 @@
 #define GDT_STD_SELECTOR_ABS16_CS  3
 #define GDT_STD_SELECTOR_ABS16_DS  4
 #define GDT_STD_SELECTOR_ABS32_DS  6
-#define GDT_STD_SIZE 5 // FIX
+#define GDT_STD_SIZE 7
 // Entries on and after GDT_STD_SIZE are reserved for applications
 // and are in CS, DS order for each app.
 // END_ENSURE_SAME_gdt_asm

src/drivers/display/text_mode_vga.asm

@@ -16,7 +16,7 @@ global _low_flush
         ; push edi
 
         push ds
-        mov eax, GDT_ABS16_DS
+        mov eax, GDT_ABS32_DS
         mov ds, eax                 ; Absolute memory address
 
         mov ebx,[ebp + 0x10]        ; (ROW_WIDTH*y+x)
@@ -41,7 +41,7 @@ global _low_flush
         ; push esi
         ; push edi
         push ds
-        mov eax, GDT_ABS16_DS
+        mov eax, GDT_ABS32_DS
         mov ds, eax                 ; Absolute memory address
 
         ; Copy char+colors in Row Order Format
@@ -73,7 +73,7 @@ global _low_flush
         push esi
         push edi
         push es
-        mov eax, GDT_ABS16_DS
+        mov eax, GDT_ABS32_DS
         mov es, eax                 ; Absolute memory address
 
         mov esi, [ebp + 0x8]    ; (buffer)

src/memmgr/tables/gdt.c

@@ -73,11 +73,11 @@ void populate_gdt_table(
         0x92);
     // NOT USING &gdt_table[5] for now.
     // Absolute Data Segment Selector
-    // populate_gdt_entry(
-    //     &gdt_table[GDT_STD_SELECTOR_ABS32_DS],
-    //     0, 0xffffffff,
-    //     0b0100,  // 32-bit protected mode
-    //     0x92);
+    populate_gdt_entry(
+        &gdt_table[GDT_STD_SELECTOR_ABS32_DS],
+        0, 0xffffffff,
+        0b0100,  // 32-bit protected mode
+        0x92);
     // Ensure GDT_STD_SIZE = last sector entry+1
 
     gdtr->base_address = ds_fix+(int)gdt_table;