From c0018a3607947922a51597df12fd2a6528af2fa2 Mon Sep 17 00:00:00 2001
From: Alexis211 <alexis211@gmail.com>
Date: Fri, 5 Feb 2010 19:37:47 +0100
Subject: More work on tasking, paging, syscalls, stuff.

---
 src/stem/mem/paging.c | 14 ++++++++++++++
 src/stem/mem/paging.h |  1 +
 2 files changed, 15 insertions(+)

(limited to 'src/stem/mem')

diff --git a/src/stem/mem/paging.c b/src/stem/mem/paging.c
index 4cc861c..4d98e75 100644
--- a/src/stem/mem/paging.c
+++ b/src/stem/mem/paging.c
@@ -30,6 +30,7 @@ void paging_init(size_t totalRam) {
 	frames.bits = kmalloc(INDEX_FROM_BIT(frames.size));
 
 	kernel_pagedir = kmalloc(sizeof(struct page_directory));
+	kernel_pagedir->mappedSegs = 0;
 	kernel_pagedir->tablesPhysical = kmalloc_page(&kernel_pagedir->physicalAddr);
 	for (i = 0; i < 1024; i++) {
 		kernel_pagedir->tables[i] = 0;
@@ -73,6 +74,7 @@ struct page_directory *pagedir_new() {
 
 	struct page_directory *pd = kmalloc(sizeof(struct page_directory));
 	pd->tablesPhysical = kmalloc_page(&pd->physicalAddr);
+	pd->mappedSegs = 0;
 
 	for (i = 768; i < 1024; i++) {
 		pd->tables[i] = kernel_pagedir->tables[i];
@@ -82,6 +84,18 @@ struct page_directory *pagedir_new() {
 	return pd;
 }
 
+void pagedir_delete(struct page_directory *pd) {
+	uint32_t i;
+	//Unmap segments
+	while (pd->mappedSegs != 0) seg_unmap(pd->mappedSegs);
+	//Cleanup page tables
+	for (i = 0; i < 768; i++) {
+		kfree_page(pd->tables[i]);
+	}
+	kfree_page(pd->tablesPhysical);
+	kfree(pd);
+}
+
 uint32_t paging_fault(struct registers *regs) {
 	size_t addr;
 	struct segment_map *seg = 0;
diff --git a/src/stem/mem/paging.h b/src/stem/mem/paging.h
index 9ee6c4c..cb76cd6 100644
--- a/src/stem/mem/paging.h
+++ b/src/stem/mem/paging.h
@@ -35,6 +35,7 @@ void paging_init(size_t totalRam);
 void paging_cleanup();
 void pagedir_switch(struct page_directory *pd);
 struct page_directory *pagedir_new();	//Creates a brand new empty page directory for a process, with kernel pages
+void pagedir_delete(struct page_directory *pagedir);
 struct page *pagedir_getPage(struct page_directory *pd, uint32_t address, int make);
 void page_map(struct page *page, uint32_t frame, uint32_t user, uint32_t rw);
 void page_unmap(struct page *page);
-- 
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