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/*
* bubbl
* Copyright (C) 2025 Raghuram Subramani <raghus2247@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <libk/stdio.h>
#include <mm/physical_mm.h>
#include <mm/virtual_mm.h>
extern uint32_t kernel_start;
extern uint32_t kernel_end;
uint32_t initial_page_directory[PAGE_DIRECTORY_SIZE];
uint32_t initial_page_table[PAGE_TABLE_SIZE];
bool
virtual_mm_allocate_page(uint32_t *pt_entry)
{
void *ptr = physical_mm_allocate_block();
if (!ptr)
return false;
ADD_ATTRIB(pt_entry, SET_PTE_FRAME((uint32_t) ptr));
ADD_ATTRIB(pt_entry, SET_PTE_PRESENT(1));
return true;
}
bool
virtual_mm_free_page(uint32_t *pt_entry)
{
void *ptr = (void *) GET_PTE_FRAME(pt_entry);
if (ptr)
physical_mm_free_block(ptr);
*pt_entry = 0;
return true;
}
ALWAYS_INLINE uint32_t *
virtual_mm_lookup_table(uint32_t *page_table, uint32_t virtual_addr)
{
if (page_table)
return &page_table[PAGE_TABLE_INDEX(virtual_addr)];
return NULL;
}
ALWAYS_INLINE uint32_t *
virtual_mm_lookup_directory(uint32_t *page_directory, uint32_t virtual_addr)
{
if (page_directory)
return &page_directory[PAGE_DIRECTORY_INDEX(virtual_addr)];
return NULL;
}
ALWAYS_INLINE void
virtual_mm_load_page_directory(uint32_t *page_directory)
{
__asm__("movl %0, %%cr0" ::"r"(page_directory));
}
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