BarinkOS/source/kernel/PreKernel/prekernel.cpp

118 lines
3.3 KiB
C++

#include <stdint.h>
#include <stddef.h>
#include "multiboot.h"
#include "bootstructure.h"
#define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))
extern "C" void testLauncher ( unsigned long magic, multiboot_info_t* mbi) {
// Create the bootInfoBlock at its location
BootInfoBlock* BIB = (BootInfoBlock*) BootInfoBlock_pptr;
/*
* Check Multiboot magic number
*/
if (magic != MULTIBOOT_BOOTLOADER_MAGIC)
{
BIB->MapIsInvalid = true;
return;
} else{
BIB->MapIsInvalid = false;
}
/* 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))
{
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))
{
BIB->ValidELFHeader = true;
multiboot_elf_section_header_table_t *multiboot_elf_sec = &(mbi->u.elf_sec);
}else{
BIB->ValidELFHeader = false;
}
/*
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))
{
BIB->PhysicalMemoryMapAvailable = true;
BIB->MemoryMap = (MemoryInfoBlock*) MemoryMapHeap_pptr;
multiboot_memory_map_t *mmap = (multiboot_memory_map_t*) (mbi->mmap_addr) ;
auto MemoryMapEnd = mbi->mmap_addr + mbi->mmap_length;
auto CurrentInfoBlock = BIB->MemoryMap;
while((unsigned long) mmap < MemoryMapEnd){
CurrentInfoBlock->Base_addr = mmap->addr;
CurrentInfoBlock->Memory_Size = mmap->len;
if(mmap->type == MULTIBOOT_MEMORY_AVAILABLE)
CurrentInfoBlock->type &= 0x1;
if(mmap->type == MULTIBOOT_MEMORY_ACPI_RECLAIMABLE)
CurrentInfoBlock->type &= 0x2;
if(mmap->type == MULTIBOOT_MEMORY_RESERVED)
CurrentInfoBlock->type &= 0x4;
if(mmap->type == MULTIBOOT_MEMORY_NVS)
CurrentInfoBlock->type &= 0x8;
if(mmap->type == MULTIBOOT_MEMORY_BADRAM)
CurrentInfoBlock->type &= 0x10;
// continue to the next block
mmap = (multiboot_memory_map_t *) ((unsigned long) mmap + mmap->size + sizeof(mmap->size));
CurrentInfoBlock->next = (MemoryInfoBlock*) ((uint32_t)CurrentInfoBlock) + sizeof(MemoryInfoBlock);
CurrentInfoBlock = CurrentInfoBlock->next;
}
CurrentInfoBlock->next = (MemoryInfoBlock*) 0x0;
} else
{
BIB->PhysicalMemoryMapAvailable = false;
}
/* Draw diagonal blue line */
if (CHECK_FLAG (mbi->flags, 12)){
BIB->EnabledVBE = true;
} else{
BIB->EnabledVBE;
}
}