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/**
* @file
* http://www.brokenthorn.com/Resources/OSDev18.html
* https://wiki.osdev.org/Memory_Map_(x86)
*
* Paging
* ======
*
* The Smallest Managable Unit is a Page containing 4096 (0x1000) bytes.
*
* A Page Directory holds 1024 tables each mapping 1024 pages, totaling
* in 0x100000000 bytes of addressable space (4gigs).
*
* The first 32megs will get ALWAYS identity mapped (hold kernel code/kernel stack etc)
* This are the first 8 page-tables
*
* Layout
* ======
*
* We are aiming for the following layout:
* TODO: update, this is not true anumore!
* 0xFFFFFFFF
* 0xC0000000 RESERVED
*
* 0xB0000000 User Stack TOP (Grows down) |
* env, argc, argv ... |
* | alltogether ~2.5gigs
* .......... User Heap (brk()) |
* 0x08000000 User Code |
* |
* | almost 100 megs (in kernel alloc/free private-cpu and shared)
* |
* 0x02000000 FoolOS TSS Stack TOP (max ~8mb) GROWS DOWN
* leave few empty pages under stack as guard.
*
* 0x01800000 FoolOS Stack TOP (max ~8mb) GROWS DOWN
* leave few empty pages under stack as guard.
*
* 0x01000000
* 0x00EFFFFF RESERVED
* 0x00100000 FoolOS Kernel (max ~14mb)
* 0x00007BFF RESERVED
* 0x00007000 16-bit SMP entry (max ~3kb)
* 0x00006fff smp entry stacks (growing down)
* 0x00000500
* 0x00000000 RESERVED
*
*/
#include <stdint.h>
#include "multiboot.h"
#include "acpi.h"
struct pdirectory_struct;
void vmem_init(multiboot_information *cfg_multiboot, acpi_information *cfg_acpi,uint32_t e1000_addr);
void vmem_free_dir(struct pdirectory_struct *dir);
struct pdirectory_struct* vmem_new_space_dir(struct pdirectory_struct *copy_dir,bool stack_only);
void vmem_free_space_dir(struct pdirectory_struct *dir,bool stack_only);
void vmem_add_framebuffer(struct pdirectory_struct *dir);
struct pdirectory_struct* vmem_kernel_dir();
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