28. April 2024, 03:41
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paging_directory = (paging_directory_t)phys_alloc(PAGING_DIRECTORY_SIZE);
memset(paging_directory , 0 , BLOCK_SIZE);
paging_directory[PAGING_VIRTADDR >> PAGING_DIR_SHIFT] = (dword)paging_directory | PAGING_PRESENT | PAGING_WRITEABLE;
size_t kernel_size = ((dword)kernel_end - (dword)kernel_start) / BLOCK_SIZE;
map_paging_range(kernel_start , kernel_mem_start , PAGING_PRESENT | PAGING_WRITEABLE | PAGING_NOTTLB , kernel_size);
size_t video_size = 80 * 25 * 2 / BLOCK_SIZE + 1;
map_paging_range((physaddr_t)0xB8000 , (virtaddr_t)0xB8000 , PAGING_PRESENT | PAGING_WRITEABLE , video_size);
map_paging(paging_directory , paging_directory , PAGING_PRESENT | PAGING_WRITEABLE);
map_paging_range(bitmap_start , bitmap_start , PAGING_PRESENT | PAGING_WRITEABLE , bitmap_length / BLOCK_SIZE);
//enable paging
_write_cr3((dword)&paging_directory);
_write_cr0(_read_cr0() | 0x80000000);
size_t video_size = 80 * 25 * 2 / BLOCK_SIZE + 1;
map_paging_range((physaddr_t)0xB8000 , (virtaddr_t)0xB8000 , PAGING_PRESENT | PAGING_WRITEABLE , video_size);
paging_table_t paging_table;
dword virt_page = (dword)vaddr;
if(vaddr == NULL)
panic("Illegal call to the NULL-Table-Entry");
if(flags & ~0x01F)
return;
if(((dword)vaddr | (dword)paddr) && 0xFFF)
panic("The requested address is not 4k-aligned");
//page does not exist
if((paging_directory[virt_page / PAGING_TABLE_SIZE] & PAGING_NOTTLB) == 0 ){
paging_table = (paging_table_t)phys_alloc(sizeof(paging_table_t));
paging_directory[virt_page / PAGING_TABLE_SIZE] = ((dword)paging_table) | flags;
memset(paging_table , 0 , BLOCK_SIZE);
}
CC = /usr/bin/gcc
ASM = /usr/bin/nasm
CFLAGS = -O3 -fstrength-reduce -fomit-frame-pointer -finline-functions -fno-stack-protector -nostdinc -fno-builtin -march=i386 -I../include
ASMFLAGS = -felf
all:
$(CC) $(CLFAGS) -c -o ../../obj/virtmem.c.o virtmem.c
$(CC) $(CFLAGS) -c -o ../../obj/physmem.c.o physmem.c
$(ASM) $(ASMFLAGS) -o ../../obj/virtmem.asm.o virtmem.asm
((dword) (mmap[i].mm_base_addr + mmap[i].mm_length)
> (dword) (uintptr_t) upper_end) && (mmap[i].mm_type == 1)Größe der Bitmap: 0x00000FFE
Größe des Speichers: 8184
Startstelle der Bitmap: 0x00000000
Die Größe des Rams habe ich wie folgt berechnet:Nur um das klarzustellen:
Du machst in deinem Assembler-Teil:Code: [Auswählen]push ebx
push eax
call kernel_entry
Die Funktion kernel_entry hat in C die folgende Deklaration:Code: [Auswählen]void kernel_entry(unsigned int magic, struct multiboot_info* mbi)
Mit argv machst du da eigentlich nichts, ausser du weisst was du tust.
size_t count_bitmap_size(struct multiboot_info *mb_info){
physaddr_t highestAddr = 0;
if (mb_info->mi_flags & MULTIBOOT_INFO_HAS_MMAP){
struct multiboot_mmap *memmap = (struct multiboot_mmap*)mb_info->mi_mmap_addr;
size_t i;
for(i = 0; i < mb_info->mi_mmap_length / sizeof(memmap); i++){
if(((dword)(memmap[i].mm_base_addr + memmap[i].mm_length) >
(dword)highestAddr) && (memmap[i].mm_type == 1)){
highestAddr = (physaddr_t)(dword)(memmap[i].mm_base_addr + memmap[i].mm_length);
}
}
}
else
panic("Unable to count the memorysize.");
return (size_t)highestAddr / BLOCK_SIZE / 8;
}
push ebx
push eax
init_kernel((struct multiboot_info*)argv[1]);
((dword)memmap[i].mm_base_addr + memmap[i].mm_length >(dword)highestAddr)