Nigel/BarinkOS
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Multiboot Memory Map get copied to a "safe" place

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This commit is contained in:
Nigel Barink 2022-08-23 21:35:19 +02:00
parent 5051b8903c
commit 59ba41f3d2
5 changed files with 151 additions and 43 deletions
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15
source/kernel/Boot/Multiboot.S Normal file
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@ -0,0 +1,15 @@
/*
* Multiboot
*/
.set ALIGN, 1<<0 /* align loaded modules on page boundaries */
.set MEMINFO, 1<<1 /* provide memory map */
.set FLAGS, ALIGN | MEMINFO /* this is the Multiboot 'flag' field */
.set MAGIC, 0x1BADB002 /* 'magic number' lets bootloader find the header */
.set CHECKSUM, -(MAGIC + FLAGS) /* checksum of above, to prove we are multiboot */
.section .multiboot.data, "aw"
.align 4
.long MAGIC
.long FLAGS
.long CHECKSUM

22
source/kernel/Boot/boot.s
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@ -1,18 +1,4 @@
/*
* Multiboot
*/
.set ALIGN, 1<<0 /* align loaded modules on page boundaries */
.set MEMINFO, 1<<1 /* provide memory map */
.set FLAGS, ALIGN | MEMINFO /* this is the Multiboot 'flag' field */
.set MAGIC, 0x1BADB002 /* 'magic number' lets bootloader find the header */
.set CHECKSUM, -(MAGIC + FLAGS) /* checksum of above, to prove we are multiboot */
.section .multiboot.data, "aw"
.align 4
.long MAGIC
.long FLAGS
.long CHECKSUM
.include "./source/kernel/Boot/Multiboot.S"
/*
* Allocate initial stack
*/
@ -120,14 +106,8 @@ isPaging:
pushl $0
popf
call early_main
cli
1: hlt
jmp 1b

21
source/kernel/PreKernel/bootstructure.h
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@ -5,6 +5,24 @@
extern "C" const uint32_t kernel_begin;
extern "C" const uint32_t kernel_end;
// Put the BootInfoBlock 1MB above the kernel.
const uint32_t BootInfoBlock_pptr = (uint32_t)&kernel_end - 0xC0000000 + 0x1;
const uint32_t MemoryMapHeap_pptr = BootInfoBlock_pptr + 0x1;
#define IS_AVAILABLE_MEM(MEM_TYPE) MEM_TYPE & 0x1
#define IS_ACPI_MEM(MEM_TYPE) MEM_TYPE & 0x2
#define IS_RESERVED_MEM(MEM_TYPE) MEM_TYPE & 0x3
#define IS_NVS_MEMORY(MEM_TYPE) MEM_TYPE & 0x8
#define IS_BADRAM_MEMORY(MEM_TYPE) MEM_TYPE & 0x10
struct MemoryInfoBlock {
uint32_t Base_addr ;
uint32_t Memory_Size;
MemoryInfoBlock* next;
uint8_t type;
};
struct BootInfoBlock {
bool MapIsInvalid;
uint32_t bootDeviceID ;
@ -21,8 +39,7 @@ struct BootInfoBlock {
bool EnabledVBE;
bool PhysicalMemoryMapAvailable;
MemoryInfoBlock* MemoryMap;
};
// Put the BootInfoBlock 1MB above the kernel.
const uint32_t BootInfoBlock_pptr = kernel_end - 0xC0000000 + 0x1000;

64
source/kernel/PreKernel/prekernel.cpp
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@ -25,6 +25,8 @@ extern "C" void testLauncher ( unsigned long magic, multiboot_info_t* mbi) {
if (CHECK_FLAG (mbi->flags, 1))
{
BIB->bootDeviceID = mbi->boot_device;
} else{
BIB->bootDeviceID = 0x11111111;
}
/* Are mods_* valid? */
@ -36,7 +38,7 @@ extern "C" void testLauncher ( unsigned long magic, multiboot_info_t* mbi) {
for(i = 0, mod = (multiboot_module_t *) mbi->mods_addr; i < mbi->mods_count; i++ , mod++){
}
}
@ -60,29 +62,51 @@ extern "C" void testLauncher ( unsigned long magic, multiboot_info_t* mbi) {
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))
{
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) ;
for (; (unsigned long) mmap < mbi->mmap_addr + mbi->mmap_length; mmap = (multiboot_memory_map_t *) ((unsigned long) mmap + mmap->size + sizeof(mmap->size))){
if ( mmap->type == MULTIBOOT_MEMORY_AVAILABLE){
} else{
}
}
auto MemoryMapEnd = mbi->mmap_addr + mbi->mmap_length;
} else{
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)){

72
source/kernel/kernel.cpp
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@ -19,6 +19,22 @@ extern "C" void early_main()
* Show a little banner for cuteness
*/
printf("|=== BarinkOS ===|\n");
printf("Kernel End Addr: 0x%x\n" , &kernel_end + KERNEL_BASE_ADDR);
uint32_t PageDirectoryEntryIndex = ((uint32_t)&kernel_end + KERNEL_BASE_ADDR ) >> 2 ;
uint32_t PageTableEntryIndex = (((uint32_t)&kernel_end + KERNEL_BASE_ADDR) >> 12) & 0x1FFF;
printf("Kernel End PDE: %d, PTE: %d\n" , PageDirectoryEntryIndex, PageTableEntryIndex);
uint32_t BootInfoStruct = BootInfoBlock_pptr + 0xC0000000;
printf("Addr BootInfostruct: 0x%x\n", BootInfoStruct);
uint32_t PageDirectoryEntryIndex2 = (BootInfoStruct ) >> 2 ;
uint32_t PageTableEntryIndex2 = (BootInfoStruct >> 12) & 0x1FFF;
printf("PDE: 0x%x, PTE: 0x%x\n", PageDirectoryEntryIndex2 , PageTableEntryIndex2 );
BootInfoBlock* BootInfo = (BootInfoBlock*) ( BootInfoBlock_pptr + 0xC0000000 );
@ -41,6 +57,62 @@ extern "C" void early_main()
if(BootInfo->PhysicalMemoryMapAvailable)
{
printf("- Physical Memory Map available!\n");
// Print the memory regions
MemoryInfoBlock* currentBlock = (MemoryInfoBlock*) ((uint32_t)BootInfo->MemoryMap + KERNEL_BASE_ADDR) ;
kterm_setcolor(VGA_COLOR_RED);
printf("size of MemoryInfoBlock: 0x%x\n", sizeof(MemoryInfoBlock));
kterm_setcolor(VGA_COLOR_CYAN);
printf("Kernel End is at address: 0x%x\n", &kernel_end);
printf("BootInfo is at address: 0x%x\n", BootInfo);
printf("map is at address: 0x%x\n", currentBlock + KERNEL_BASE_ADDR);
kterm_setcolor(VGA_COLOR_WHITE);
while( (uint32_t)currentBlock->next != 0x0 )
{
kterm_setcolor(VGA_COLOR_CYAN);
printf("map is at address: 0x%x\n", ( (uint32_t)currentBlock ));
kterm_setcolor(VGA_COLOR_WHITE);
/*
uint32_t pageDirectoryIndex = ((uint32_t)&currentBlock ) >> 22;
printf("pageDirectoryIndex: %d\n", pageDirectoryIndex);
uint32_t pageTableIndex = ((uint32_t)&currentBlock >> 12) & 0x1FFF;
printf("PagTableIndex: %d\n", pageTableIndex);
*/
//printf("boot_page_directory addr: 0x%x\n", &boot_page_directory);
//printf("boot_page_table addr: 0x%x\n", &multiboot_page_table);
printf("Memory Region: \n");
if(IS_AVAILABLE_MEM(currentBlock->type)){
//printf("AVAILABLE RAM\n");
}
else if(IS_ACPI_MEM(currentBlock->type)){
printf("ACPI MEMORY\n");
}
else if(IS_RESERVED_MEM(currentBlock->type)){
printf("RESERVED MEMORY\n");
}
else if(IS_NVS_MEMORY(currentBlock->type)){
printf("NVS MEMORY \n");
}
else if(IS_BADRAM_MEMORY(currentBlock->type)){
printf("BADRAM MEMORY \n");
}
else {
// printf("(TYPE 0x%x )TYPE NOT SPECIFIED\n", currentBlock->type);
}
// printf("Base address: 0x%x, Memory size: 0x%x\n", currentBlock->Base_addr, currentBlock->Memory_Size);
currentBlock = (MemoryInfoBlock*) ((uint32_t)currentBlock->next + KERNEL_BASE_ADDR );
}
}
asm volatile("mov %cr0, %eax ");