More work on IPC and userland tools.

4 files changed, 23 insertions, 2 deletions

diff --git a/src/kernel/mem/paging.c b/src/kernel/mem/paging.c
index 8996162..9972b2a 100644
--- a/src/kernel/mem/paging.c
+++ b/src/kernel/mem/paging.c
@@ -22,7 +22,6 @@ void frame_free(uint32_t id) {
 	bitset_clear(&frames, id);
 }
 
-
 void paging_init(size_t totalRam) {
 	uint32_t i;
 
diff --git a/src/kernel/mem/paging.h b/src/kernel/mem/paging.h
index cb76cd6..ec10560 100644
--- a/src/kernel/mem/paging.h
+++ b/src/kernel/mem/paging.h
@@ -26,7 +26,7 @@ struct page_directory {
 	struct segment_map *mappedSegs;
 };
 
-extern struct page_directory *kernel_pagedir;
+extern struct page_directory *kernel_pagedir, *current_pagedir;
 
 uint32_t frame_alloc();
 void frame_free(uint32_t id);
diff --git a/src/kernel/mem/seg.c b/src/kernel/mem/seg.c
index aa71564..ffaa84c 100644
--- a/src/kernel/mem/seg.c
+++ b/src/kernel/mem/seg.c
@@ -71,3 +71,24 @@ int simpleseg_handleFault(struct segment_map* sm, size_t addr, int write) {
 
 void simpleseg_delete(struct segment* seg) {
 }
+
+int simpleseg_resize(struct segment_map *map, size_t len) {
+	size_t i;
+
+	if (map == 0) return -1;
+	if (map->seg->delete != simpleseg_delete) return -2;
+
+	struct simpleseg *s = (struct simpleseg*)map->seg->seg_data;
+	if (len & 0xFFF) len = (len & 0xFFFFF000) + 0x1000;
+	if (len < map->len) {
+		for (i = map->start + len; i < map->start + map->len; i += 0x1000) {
+			page_unmapFree(pagedir_getPage(map->pagedir, i, 0));
+		}
+		map->len = len;
+		s->len = len;
+	} else if (len > map->len) {
+		map->len = len;
+		s->len = len;
+	}
+	return 0;
+}
diff --git a/src/kernel/mem/seg.h b/src/kernel/mem/seg.h
index 4d6660f..26664dc 100644
--- a/src/kernel/mem/seg.h
+++ b/src/kernel/mem/seg.h
@@ -37,5 +37,6 @@ struct segment_map* simpleseg_map(struct segment* seg, struct page_directory* pa
 void simpleseg_unmap(struct segment_map*);
 void simpleseg_delete(struct segment *seg);
 int simpleseg_handleFault(struct segment_map* map, size_t addr, int write);
+int simpleseg_resize(struct segment_map *map, size_t len);
 
 #endif