Updated the KernelInformationStruct, added BGA (Bochs Graphics Extensions) mode termimal, added new system calls to get terminal width. Updated world.bin to calculate sizes. Fixed a bug where GetExhaustive would crash when given a completely null path. Started work on V86 for VBE support.

src/kernel/gdt.cpp

@@ -38,7 +38,7 @@ tss_struct tss = (tss_struct) {
   .ldtr = 0,
   ._reserved10 = 0,
   ._reserved11 = 0,
-  .iopb = 104
+  .iopb = sizeof(tss_struct)
 };
 
 constexpr gdt_entry::gdt_entry(uint32_t limit, uint32_t base, bool rw, bool exec, bool system, uint8_t ring) :
@@ -77,25 +77,29 @@ constexpr gdt_entry::gdt_entry() :
   base_hi(0)
 {}
 
-gdt_entry gdt[] = {
-  gdt_entry(), // Null Segment
-  gdt_entry(0xfffff, 0, 1, 1, 1, 0), // Kernel Code Segment
-  gdt_entry(0xfffff, 0, 1, 0, 1, 0), // Kernel Data Segment
+gdt_and_iopb gai = {
+  .gdt = {
+    gdt_entry(), // Null Segment
+    gdt_entry(0xfffff, 0, 1, 1, 1, 0), // Kernel Code Segment
+    gdt_entry(0xfffff, 0, 1, 0, 1, 0), // Kernel Data Segment
 
-  gdt_entry(0xfffff, 0, 1, 1, 1, 3), // User Code Segment
-  gdt_entry(0xfffff, 0, 1, 0, 1, 3), // User Data Segment
+    gdt_entry(0xfffff, 0, 1, 1, 1, 3), // User Code Segment
+    gdt_entry(0xfffff, 0, 1, 0, 1, 3), // User Data Segment
 
-  gdt_entry() // Empty Task State Segment
+    gdt_entry() // Empty Task State Segment
+  }
 };
 
 gdt_descr descr = (gdt_descr){
-  .size = sizeof(gdt) - 1,
-  .offset = gdt,
+  .size = sizeof(gai.gdt) - 1,
+  .offset = gai.gdt,
 };
 
 void init_gdt() {
-  gdt[5] = gdt_entry(sizeof(tss), &tss, 0, 1, 0, 0); // Initialise the TSS.
-  gdt[5].accessed = 1;
+  gai.gdt[5] = gdt_entry(sizeof(tss) + 8193, &tss, 0, 1, 0, 0); // Initialise the TSS.
+  gai.gdt[5].accessed = 1;
+  for (int i=0; i<8192; i++)
+    gai.iopb[i] = 0;
   asm volatile("lgdt %0;"
                "mov $0x10, %%eax;"
                "mov %%eax, %%ss;"