Fix paging to completion.

More debug messages, some things are slightly broken. We can recover.

build.json

@@ -35,6 +35,7 @@
             "$root/chroma/system/memory/abstract_allocator.c",
             "$root/chroma/system/memory/physmem.c",
             "$root/chroma/system/memory/paging.c",
+            "$root/chroma/system/memory/liballoc.c",
             "$root/chroma/system/drivers/keyboard.c",
             "$root/chroma/system/drivers/elf.c"
         ],

chroma/inc/kernel/system/memory.h

@@ -110,7 +110,7 @@
 
 #define MMIO_REGION         0xFFFFFFFFF8000000ull   // Cannot move!
 #define FB_REGION           0xFFFFFFFFFC000000ull   // Cannot move!
-#define FB_PHYSICAL         0x00000000FD000000ull // Physical location of the Framebuffer
+#define FB_PHYSICAL         (size_t) bootldr.fb_ptr // 0x00000000FD000000ull - Physical location of the Framebuffer
 #define KERNEL_REGION       0xFFFFFFFFFFE00000ull   // -2MiB, from bootloader
 #define KERNEL_TEXT         0x0000000000002000ull   // Offset of symbols from the kernel text
 

chroma/kernel.c

@@ -22,7 +22,9 @@ int Main(void) {
     KernelAddressSpace = (address_space_t) {0};
     
     SerialPrintf("\r\n[ boot] Booting Chroma..\r\n");
+    SerialPrintf("[ boot] Bootloader data structure at 0x%p\r\n", (size_t) &bootldr);
     SerialPrintf("[ boot] Kernel loaded at 0x%p, ends at 0x%p, is %d bytes long.\r\n", KernelAddr, KernelEnd, KernelEnd - KernelAddr);
+    SerialPrintf("[ boot] Framebuffer at 0x%p / 0x%p, is %dx%d, 0x%x bytes long.\r\n", bootldr.fb_ptr, (size_t) &fb, bootldr.fb_width, bootldr.fb_height, bootldr.fb_size);
     SerialPrintf("[ boot] Initrd is physically at 0x%p, and is %d bytes long.\r\n", bootldr.initrd_ptr, bootldr.initrd_size);
     SerialPrintf("[ boot] Initrd's header is 0x%p\r\n", FIXENDIAN32(*((volatile uint32_t*)(bootldr.initrd_ptr))));
    
@@ -48,6 +50,10 @@ int Main(void) {
 
     InitPaging();
 
+    InitPrint();
+
+    WriteString("Paging complete. System initialized.");
+
 
     for(;;) { }
 

chroma/system/memory/paging.c

@@ -34,6 +34,14 @@ void InitPaging() {
         .PML4 = PhysAllocateZeroMem(4096)
     };
 
+    address_space_t BootloaderAddressSpace = (address_space_t) {
+        .Lock = {0},
+        .PML4 = (size_t*) ReadControlRegister(3)
+    };
+
+    size_t AddressToFind = (size_t) &fb;
+    size_t BootldrAddress = 0x8000;
+    
     SerialPrintf("[  Mem] Identity mapping the entirety of physical memory\r\n");
 
     for(size_t i = 0; i < MemorySize / PAGE_SIZE; i++) {
@@ -43,15 +51,21 @@ void InitPaging() {
         // TODO: Map kernel mem
     }
 
+    SerialPrintf("[  Mem] Mapping 0x%x bytes of bootloader structure, starting at 0x%p\r\n", bootldr.size, BootldrAddress);
+    for(size_t i = BootldrAddress; i < (BootldrAddress + bootldr.size); i += PAGE_SIZE)
+        MapVirtualPageNoDirect(&KernelAddressSpace, i, KERNEL_REGION + (i - BootldrAddress), 0x3);
+
     // This allows the code to actually run
-    SerialPrintf("[  Mem] Mapping kernel\r\n");
-    for(size_t i = KERNEL_PHYSICAL + KERNEL_TEXT; i < KERNEL_END; i += PAGE_SIZE) 
+    SerialPrintf("[  Mem] Mapping 0x%x bytes of kernel, starting at 0x%p\r\n", KernelEnd - KernelAddr, KERNEL_PHYSICAL + KERNEL_TEXT);
+    for(size_t i = KERNEL_PHYSICAL + KERNEL_TEXT; i < (KernelEnd - KernelAddr) + KERNEL_PHYSICAL; i += PAGE_SIZE) 
         MapVirtualPageNoDirect(&KernelAddressSpace, i, (i - KERNEL_PHYSICAL) + KERNEL_REGION, 0x3);
 
     // This allows us to write to the screen
-    SerialPrintf("[  Mem] Mapping framebuffer\r\n");
-    for(size_t i = FB_PHYSICAL; i < bootldr.fb_size + FB_PHYSICAL; i += PAGE_SIZE)
-        MapVirtualPageNoDirect(&KernelAddressSpace, i, (i - FB_PHYSICAL) + FB_REGION, 0x3);
+    SerialPrintf("[  Mem] Mapping 0x%x bytes of framebuffer, starting at 0x%p\r\n", bootldr.fb_size, FB_PHYSICAL);
+    for(size_t i = FB_PHYSICAL; i < bootldr.fb_size + FB_PHYSICAL; i += PAGE_SIZE) {
+        MapVirtualPageNoDirect(&KernelAddressSpace, i, i, 0x3); // FD000000 + (page)
+        MapVirtualPageNoDirect(&KernelAddressSpace, i, (i - FB_PHYSICAL) + FB_REGION, 0x3); // FFFFFFFFFC000000 + (page)
+    }
     
     // This allows us to call functions
     SerialPrintf("[  Mem] Mapping stack\r\n");
@@ -59,16 +73,12 @@ void InitPaging() {
 
     // Make sure everything is sane
     SerialPrintf("[  Mem] Diagnostic: Querying existing page tables\r\n");
-    address_space_t BootloaderAddressSpace = (address_space_t) {
-        .Lock = {0},
-        .PML4 = (size_t*) ReadControlRegister(3)
-    };
 
-    size_t AddressToFind = 0xffffffffffffff58;
+    AddressToFind = (size_t) &(bootldr);
     size_t BootloaderAddress = DecodeVirtualAddressNoDirect(&BootloaderAddressSpace, AddressToFind);
     size_t KernelDisoveredAddress = DecodeVirtualAddressNoDirect(&KernelAddressSpace, AddressToFind);
-    SerialPrintf("[  Mem] Diagnostic: Existing pagetables put 0x%p at 0x%p.\r\n", AddressToFind, BootloaderAddress);
-    SerialPrintf("[  Mem] Diagnostic: Our pagetables put 0x%p at 0x%p.\r\n", AddressToFind, KernelDisoveredAddress);
+    SerialPrintf("[  Mem] Diagnostic: Existing pagetables put 0x%p at 0x%p + 0x%p.\r\n", AddressToFind, BootloaderAddress, AddressToFind & ~STACK_TOP);
+    SerialPrintf("[  Mem] Diagnostic: Our pagetables put 0x%p at 0x%p + 0x%p.\r\n", AddressToFind, KernelDisoveredAddress, AddressToFind & ~STACK_TOP);
     SerialPrintf("[  Mem] %s\r\n", BootloaderAddress == KernelDisoveredAddress ? "These match. Continuing." : "These do not match. Continuing with caution..");
     
     //if(BootloaderAddress != KernelDisoveredAddress)
@@ -77,7 +87,6 @@ void InitPaging() {
     SerialPrintf("[  Mem] Attempting to jump into our new pagetables: 0x%p\r\n", (size_t) KernelAddressSpace.PML4);
     WriteControlRegister(3, (size_t) KernelAddressSpace.PML4 & STACK_TOP);
     SerialPrintf("[  Mem] Worked\r\n");
-    for(;;) {}
 }
 
 

chroma/video/draw.c

@@ -45,7 +45,7 @@ typedef struct {
     uint32_t    scrlMode;
 } PRINTINFO;
 
-PRINTINFO PrintInfo = {0};
+static PRINTINFO PrintInfo = {0};
 
 void InitPrint() {
     PrintInfo.charHeight = 8;