From eed77bd2970a00d1394ed027ceca5b646e4671ce Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Wed, 17 Jun 2020 18:31:46 +0200
Subject: Started rewrite

---
 src/kernel/memory/paging.c | 117 ---------------------------------------------
 1 file changed, 117 deletions(-)
 delete mode 100644 src/kernel/memory/paging.c

(limited to 'src/kernel/memory/paging.c')

diff --git a/src/kernel/memory/paging.c b/src/kernel/memory/paging.c
deleted file mode 100644
index e2c48b8..0000000
--- a/src/kernel/memory/paging.c
+++ /dev/null
@@ -1,117 +0,0 @@
-#include <io/io.h>
-#include <lib/lib.h>
-#include <memory/alloc.h>
-#include <memory/mmap.h>
-#include <memory/paging.h>
-#include <stdint.h>
-#include <system.h>
-
-struct page_dir *kernel_page_directory;
-
-void paging_install()
-{
-	memory_init();
-
-	struct page_table *page_table;
-
-	page_table = kmalloc_frames(1);
-	memset(page_table, 0, sizeof(struct page_table));
-	for (u32 i = 0; i < PAGE_COUNT; i++) {
-		page_table->entries[i].present = 1;
-		page_table->entries[i].writable = 1;
-		page_table->entries[i].address = SHIFT(i * PAGE_SIZE);
-	}
-
-	kernel_page_directory = kmalloc_frames(1);
-	memset(kernel_page_directory, 0, sizeof(struct page_dir));
-	kernel_page_directory->entries[0].present = 1;
-	kernel_page_directory->entries[0].writable = 1;
-	kernel_page_directory->entries[0].address = SHIFT((u32)page_table);
-
-	paging_switch_dir((u32)kernel_page_directory);
-	paging_enable();
-	info("Installed paging");
-
-	// Test mallocing
-	u32 *c = malloc(2048);
-	c[42] = 0x4242;
-	assert(c[42] == 0x4242);
-	free(c);
-	info("Malloc test succeeded!");
-}
-
-void paging_disable()
-{
-	u32 cr0 = cr0_get();
-	cr0 &= 0x7fffffff;
-	cr0_set(cr0);
-	paging_enabled = 0;
-}
-
-void paging_enable()
-{
-	u32 cr0 = cr0_get();
-	cr0 |= 0x80000000;
-	cr0_set(cr0);
-	paging_enabled = 1;
-}
-
-void paging_switch_dir(u32 dir)
-{
-	cr3_set(dir);
-}
-
-struct page_table_entry *paging_get_page(u32 address, struct page_dir *page_dir)
-{
-	struct page_table *page_table;
-
-	address /= PAGE_SIZE;
-	u32 n = address / PAGE_COUNT;
-
-	if (page_dir->entries[n].present == 0) {
-		page_table = kmalloc_frames(1);
-		memset(page_table, 0, sizeof(struct page_table));
-
-		page_dir->entries[n].address = SHIFT((u32)page_table);
-		page_dir->entries[n].present = 1;
-		page_dir->entries[n].writable = 1;
-		page_dir->entries[n].user = 1;
-	} else {
-		page_table = (void *)UNSHIFT(page_dir->entries[n].address);
-	}
-
-	return &page_table->entries[address % PAGE_COUNT];
-}
-
-void paging_frame_alloc(struct page_table_entry *page)
-{
-	void *ptr = kmalloc_frames(1);
-
-	if (page->address != 0) {
-		warn("Page is already allocated");
-		return;
-	}
-	page->address = SHIFT((u32)ptr);
-	page->present = 1;
-	page->user = 1;
-}
-
-void paging_frame_free(struct page_table_entry *page)
-{
-	kfree_frames((void *)UNSHIFT(page->address), 1);
-	memset((void *)page, 0, sizeof(struct page_table_entry));
-}
-
-struct page_dir *paging_make_dir()
-{
-	struct page_dir *ret = kmalloc_frames(1);
-
-	memcpy(ret, kernel_page_directory, sizeof(struct page_dir));
-
-	return ret;
-}
-
-void paging_free_dir(struct page_dir *page_dir)
-{
-	kfree_frames(page_dir, 1);
-}
\ No newline at end of file
-- 
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