Nigel
656ca0baa8
* BUG: allocated blocks is possibly incorrect! * prekernel no longer gets compiled as being in physical memory
141 lines
4.9 KiB
C++
141 lines
4.9 KiB
C++
#include <stdint.h>
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#include <stddef.h>
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#include "multiboot.h"
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#include "../memory/PhysicalMemoryManager.h"
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#define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))
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#define VADDR_TO_PADDR(vaddr) (vaddr - 0xC0000000)
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#define PADDR_TO_VADDR(paddr) (paddr + 0xC0000000)
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extern "C" void prekernelSetup ( unsigned long magic, multiboot_info_t* mbi)
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{
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/*
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* Check Multiboot magic number
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*/
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if (magic != MULTIBOOT_BOOTLOADER_MAGIC)
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{
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// PANIC!!
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return;
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}
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mbi = PADDR_TO_VADDR(mbi);
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// Setup the physical memory manager immmediatly
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// Doing so saves the complications of doing it later when
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// paging is enabled
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/*
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If we got a memory map from our bootloader we
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should be parsing it to find out the memory regions available.
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*/
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if (CHECK_FLAG(mbi->flags, 6))
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{
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// Calculate total memory size
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uint32_t RAM_size = 0;
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for(
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multiboot_memory_map_t* mmap = (multiboot_memory_map_t*) mbi->mmap_addr;
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(unsigned long)mmap < mbi->mmap_addr + mbi->mmap_length;
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mmap += mmap->size +sizeof(mmap->size)
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){
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RAM_size += mmap->len;
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}
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// Call SetupPhysicalMemoryManager at its physical address
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SetupPhysicalMemoryManager ( (uint32_t)VADDR_TO_PADDR(&kernel_end), RAM_size);
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for(
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multiboot_memory_map_t* mmap = (multiboot_memory_map_t*) mbi->mmap_addr;
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(unsigned long)mmap < mbi->mmap_addr + mbi->mmap_length;
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mmap += mmap->size +sizeof(mmap->size)
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){
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if(mmap->type == MULTIBOOT_MEMORY_AVAILABLE)
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deallocate_region(mmap->addr, mmap->len);
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if(mmap->type == MULTIBOOT_MEMORY_ACPI_RECLAIMABLE)
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allocate_region(mmap->addr, mmap->len);
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if(mmap->type == MULTIBOOT_MEMORY_RESERVED)
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allocate_region(mmap->addr, mmap->len);
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if(mmap->type == MULTIBOOT_MEMORY_NVS)
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allocate_region(mmap->addr, mmap->len);
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if(mmap->type == MULTIBOOT_MEMORY_BADRAM)
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allocate_region(mmap->addr, mmap->len);
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}
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// Allocate the kernel
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allocate_region( (uint32_t)&kernel_begin, ( (uint32_t)&kernel_end - (uint32_t)&kernel_begin)- 0xC0000000 );
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// Allocate the memory region below 1MB
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allocate_region(0x0000000, 0x00100000);
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}
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else
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{
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// We didn't get a memory map from our bootloader.
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// PANIC!!!!
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return;
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}
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// allocate a full block for the other boot info!
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BootInfoBlock* BIB = (BootInfoBlock*) allocate_block();
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/* is boot device valid ? */
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if (CHECK_FLAG (mbi->flags, 1))
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{
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BIB->bootDeviceID = mbi->boot_device;
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} else{
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BIB->bootDeviceID = 0x11111111;
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}
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/* Are mods_* valid? */
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if(CHECK_FLAG ( mbi->flags, 3)){
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multiboot_module_t *mod;
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uint32_t i;
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BIB->GrubModuleCount = mbi->mods_count;
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for(i = 0, mod = (multiboot_module_t *) mbi->mods_addr; i < mbi->mods_count; i++ , mod++){
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}
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}
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/* Is the symbol table of a.out valid? */
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if (CHECK_FLAG(mbi->flags, 4))
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{
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// NOTE: Do something with it.. (Store it , process it etc...)
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// printf("- Valid Symbol Table available at 0x%x.\n Tab Size: %d, str Size: %d\n", BootInfo->SymbolTableAddr, BootInfo->SymbolTabSize, BootInfo->SymbolStrSize);
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BIB->ValidSymbolTable = true;
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multiboot_aout_symbol_table_t *multiboot_aout_sym = &(mbi->u.aout_sym);
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} else{
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BIB->ValidSymbolTable = false;
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}
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/* Is the section header table of ELF valid? */
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if (CHECK_FLAG(mbi->flags, 5))
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{
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// NOTE: Do something with it.. (Store it , process it etc...)
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BIB->ValidELFHeader = true;
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multiboot_elf_section_header_table_t *multiboot_elf_sec = &(mbi->u.elf_sec);
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}else{
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BIB->ValidELFHeader = false;
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}
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/* Draw diagonal blue line */
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if (CHECK_FLAG (mbi->flags, 12)){
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BIB->EnabledVBE = true;
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// NOTE: Do something with it.. (Store it , process it etc...)
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} else{
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BIB->EnabledVBE;
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}
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}
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