Improved build system

Added new entries to .gitignore Moved away from source directory as central spot for all source code
2023-02-20 00:29:06 +01:00
parent 2bcc79216e
commit dea8ab7d71
105 changed files with 140 additions and 156 deletions
--- a/kernel/prekernel/prekernel.cpp
+++ b/kernel/prekernel/prekernel.cpp
@ -0,0 +1,140 @@
+#include <stdint.h>
+#include <stddef.h>
+#include "multiboot.h"
+#include "../memory/PhysicalMemoryManager.h"
+
+#define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))
+#define VADDR_TO_PADDR(vaddr) (vaddr - 0xC0000000)
+#define PADDR_TO_VADDR(paddr) (paddr + 0xC0000000)
+
+
+extern "C" void prekernelSetup  ( unsigned long magic, multiboot_info_t* mbi) 
+{
+
+        /*
+        * Check Multiboot magic number
+        */ 
+        if (magic != MULTIBOOT_BOOTLOADER_MAGIC)
+        {
+                // PANIC!!
+                return;
+        }
+
+        mbi = PADDR_TO_VADDR(mbi);
+
+        
+        // Setup the physical memory manager immmediatly 
+        // Doing so saves the complications of doing it later when 
+        // paging is enabled 
+
+        /*
+        If we got a memory map from our bootloader we 
+        should be parsing it to find out the memory regions available.
+        */
+        if (CHECK_FLAG(mbi->flags, 6))
+        {  
+               
+                // Calculate total memory size 
+                uint32_t RAM_size = 0;
+                for(
+                        multiboot_memory_map_t* mmap = (multiboot_memory_map_t*) mbi->mmap_addr;
+                         (unsigned long)mmap < mbi->mmap_addr + mbi->mmap_length;
+                          mmap += mmap->size +sizeof(mmap->size)
+                ){
+                        RAM_size += mmap->len;
+                }
+                
+                // Call SetupPhysicalMemoryManager at its physical address 
+                SetupPhysicalMemoryManager ( (uint32_t)VADDR_TO_PADDR(&kernel_end), RAM_size);
+                
+                for(
+                        multiboot_memory_map_t* mmap = (multiboot_memory_map_t*) mbi->mmap_addr;
+                         (unsigned long)mmap < mbi->mmap_addr + mbi->mmap_length;
+                          mmap += mmap->size +sizeof(mmap->size)
+                ){
+
+                        if(mmap->type == MULTIBOOT_MEMORY_AVAILABLE)
+                                deallocate_region(mmap->addr, mmap->len);
+                        if(mmap->type == MULTIBOOT_MEMORY_ACPI_RECLAIMABLE)
+                                allocate_region(mmap->addr, mmap->len);
+                        if(mmap->type == MULTIBOOT_MEMORY_RESERVED)
+                                allocate_region(mmap->addr, mmap->len);
+                        if(mmap->type == MULTIBOOT_MEMORY_NVS)
+                                allocate_region(mmap->addr, mmap->len);
+                        if(mmap->type == MULTIBOOT_MEMORY_BADRAM)
+                                allocate_region(mmap->addr, mmap->len);
+
+                }
+               
+               
+                // Allocate the kernel
+                allocate_region( (uint32_t)&kernel_begin, ( (uint32_t)&kernel_end - (uint32_t)&kernel_begin)- 0xC0000000 );
+
+                // Allocate the memory region below 1MB
+                allocate_region(0x0000000, 0x00100000);
+
+        }
+        else
+        {
+                // We didn't get a memory map from our bootloader.
+                // PANIC!!!!
+                return;
+        }
+
+        // allocate a full block for the other boot info!
+        BootInfoBlock* BIB = (BootInfoBlock*) allocate_block();
+
+        
+        /* is boot device valid ? */
+        if (CHECK_FLAG (mbi->flags, 1))
+        {
+                BIB->bootDeviceID = mbi->boot_device;
+        } else{
+                BIB->bootDeviceID = 0x11111111;
+        }
+
+        /* Are mods_* valid? */
+        if(CHECK_FLAG ( mbi->flags, 3)){
+                multiboot_module_t *mod;
+                uint32_t i;
+
+                BIB->GrubModuleCount = mbi->mods_count;
+
+
+                for(i = 0, mod = (multiboot_module_t *) mbi->mods_addr; i < mbi->mods_count; i++ , mod++){
+                        
+                }
+        }
+
+        /* Is the symbol table of a.out valid? */
+        if (CHECK_FLAG(mbi->flags, 4))
+        {
+        // NOTE: Do something with it.. (Store it , process it etc...)
+        // printf("- Valid Symbol Table available at 0x%x.\n Tab Size: %d, str Size: %d\n", BootInfo->SymbolTableAddr, BootInfo->SymbolTabSize, BootInfo->SymbolStrSize);
+                BIB->ValidSymbolTable = true;
+                multiboot_aout_symbol_table_t *multiboot_aout_sym = &(mbi->u.aout_sym);
+
+        } else{
+                BIB->ValidSymbolTable = false;
+        }
+
+        /* Is the section header table of ELF valid? */
+        if (CHECK_FLAG(mbi->flags, 5))
+        {
+                  // NOTE: Do something with it.. (Store it , process it etc...)
+                BIB->ValidELFHeader = true;
+                multiboot_elf_section_header_table_t *multiboot_elf_sec = &(mbi->u.elf_sec);
+
+        }else{
+                BIB->ValidELFHeader = false;
+        }
+
+        /* Draw diagonal blue line */
+        if (CHECK_FLAG (mbi->flags, 12)){
+                BIB->EnabledVBE = true;
+
+                   // NOTE: Do something with it.. (Store it , process it etc...)
+        } else{
+                BIB->EnabledVBE;
+        }
+}