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KERNEL: Physical Page Frame allocation

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Rewriting the setup to allow for physical memory allocation again to work.
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Nigel Barink
2022-09-01 16:11:35 +02:00
parent 59ba41f3d2
commit a5e7fdd07e
7 changed files with 107 additions and 84 deletions
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12
source/kernel/PreKernel/bootstructure.h
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@ -2,17 +2,12 @@
#include <stddef.h>
#include <stdint.h>
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_RESERVED_MEM(MEM_TYPE) MEM_TYPE & 0x4
#define IS_NVS_MEMORY(MEM_TYPE) MEM_TYPE & 0x8
#define IS_BADRAM_MEMORY(MEM_TYPE) MEM_TYPE & 0x10
@ -40,6 +35,11 @@ struct BootInfoBlock {
bool PhysicalMemoryMapAvailable;
MemoryInfoBlock* MemoryMap;
uint32_t map_size;
uint32_t MemorySize ;
};
// TODO 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 + sizeof(BootInfoBlock);

20
source/kernel/PreKernel/prekernel.cpp
View File

@ -5,7 +5,7 @@
#define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))
extern "C" void testLauncher ( unsigned long magic, multiboot_info_t* mbi) {
extern "C" void prekernelSetup ( unsigned long magic, multiboot_info_t* mbi) {
// Create the bootInfoBlock at its location
BootInfoBlock* BIB = (BootInfoBlock*) BootInfoBlock_pptr;
@ -74,23 +74,25 @@ if (CHECK_FLAG(mbi->flags, 6))
auto CurrentInfoBlock = BIB->MemoryMap;
while((unsigned long) mmap < MemoryMapEnd){
uint32_t RAM_size = 0;
while((unsigned long) mmap < MemoryMapEnd){
BIB->map_size += sizeof(MemoryInfoBlock);
CurrentInfoBlock->Base_addr = mmap->addr;
CurrentInfoBlock->Memory_Size = mmap->len;
if(mmap->type == MULTIBOOT_MEMORY_AVAILABLE)
CurrentInfoBlock->type &= 0x1;
CurrentInfoBlock->type |= 0x1;
RAM_size += mmap->len;
if(mmap->type == MULTIBOOT_MEMORY_ACPI_RECLAIMABLE)
CurrentInfoBlock->type &= 0x2;
CurrentInfoBlock->type |= 0x2;
if(mmap->type == MULTIBOOT_MEMORY_RESERVED)
CurrentInfoBlock->type &= 0x4;
CurrentInfoBlock->type |= 0x4;
if(mmap->type == MULTIBOOT_MEMORY_NVS)
CurrentInfoBlock->type &= 0x8;
CurrentInfoBlock->type |= 0x8;
if(mmap->type == MULTIBOOT_MEMORY_BADRAM)
CurrentInfoBlock->type &= 0x10;
CurrentInfoBlock->type |= 0x10;
// continue to the next block
@ -102,7 +104,7 @@ if (CHECK_FLAG(mbi->flags, 6))
}
CurrentInfoBlock->next = (MemoryInfoBlock*) 0x0;
BIB->MemorySize = RAM_size;
} else
{
BIB->PhysicalMemoryMapAvailable = false;