1 files changed, 73 insertions, 0 deletions
diff --git a/src/stem/mem/seg.c b/src/stem/mem/seg.c
new file mode 100644
index 0000000..f340c63
--- /dev/null
+++ b/src/stem/mem/seg.c
@@ -0,0 +1,73 @@
+#include "seg.h"
+#include "mem.h"
+
+struct segment_map *seg_map(struct segment* seg, struct page_directory *pagedir) {
+	struct segment_map *sm = seg->map(seg, pagedir);
+	if (sm == 0) return 0;
+	seg->mappings++;
+	sm->seg = seg;
+	sm->pagedir = pagedir;
+	sm->next = pagedir->mappedSegs;
+	pagedir->mappedSegs = sm->next;
+	return sm;
+}
+
+void seg_unmap(struct segment_map *map) {
+	map->seg->unmap(map);
+	if (map->pagedir->mappedSegs == map) {
+		map->pagedir->mappedSegs = map->pagedir->mappedSegs->next;
+	} else {
+		struct segment_map *m = map->pagedir->mappedSegs;
+		while (m->next != 0 && m->next != map) m = m->next;
+		if (m->next == map) m->next = map->next;
+	}
+	map->seg->mappings--;
+	if (map->seg->mappings == 0) {
+		map->seg->delete(map->seg);
+		kfree(map->seg->seg_data);
+		kfree(map->seg);
+	}
+	kfree (map);
+}
+
+// ************************************   SIMPLESEG stuff *************
+
+struct segment* simpleseg_make(size_t start, size_t len, int writable) {
+	struct simpleseg *ss = kmalloc(sizeof(struct simpleseg));
+	struct segment *se = kmalloc(sizeof(struct segment));
+	se->seg_data = ss;
+	se->mappings = 0;
+	se->map = simpleseg_map;
+	se->unmap = simpleseg_unmap;
+	se->delete = simpleseg_delete;
+	se->handle_fault = simpleseg_handleFault;
+	ss->writable = writable; ss->start = start; ss->len = len;
+	return se;
+}
+
+struct segment_map* simpleseg_map(struct segment* seg, struct page_directory* pagedir) {
+	struct segment_map *sm = kmalloc(sizeof(struct segment_map));
+	sm->start = ((struct simpleseg*)(seg->seg_data))->start;
+	sm->len = ((struct simpleseg*)(seg->seg_data))->len;
+	return sm;
+}
+
+void simpleseg_unmap(struct segment_map* sm) {
+	size_t i;
+	for (i = sm->start; i < sm->start + sm->len; i += 0x1000) {
+		page_unmapFree(pagedir_getPage(sm->pagedir, i, 0));
+	}
+}
+
+int simpleseg_handleFault(struct segment_map* sm, size_t addr, int write) {
+	struct simpleseg *ss = sm->seg->seg_data;
+	if (write && !ss->writable) return 1;
+	addr &= 0xFFFFF000;
+	struct page *p = pagedir_getPage(sm->pagedir, addr, 1);
+	if (p->frame != 0) return 1;
+	page_map(p, frame_alloc(), 1, ss->writable);
+	return 0;
+}
+
+void simpleseg_delete(struct segment* seg) {
+}