basic process support and some syscalls

[lunaix-os.git] / lunaix-os / kernel / mm / kalloc.c

diff --git a/lunaix-os/kernel/mm/kalloc.c b/lunaix-os/kernel/mm/kalloc.c
index 675a51f4033fe0191a5fba16c46e0f558e22f40e..91905b4139cb2ee4933c07ddb7f4f5b37e1c93ef 100644 (file)
--- a/lunaix-os/kernel/mm/kalloc.c
+++ b/lunaix-os/kernel/mm/kalloc.c
@@ -14,17 +14,15 @@
 #include <lunaix/mm/kalloc.h>
 #include <lunaix/mm/dmm.h>
 
-#include <lunaix/constants.h>
+#include <lunaix/common.h>
 #include <lunaix/spike.h>
 
-#include <libc/string.h>
+#include <klibc/string.h>
 
 #include <stdint.h>
 
 extern uint8_t __kernel_heap_start;
 
-heap_context_t __kalloc_kheap;
-
 void*
 lx_malloc_internal(heap_context_t* heap, size_t size);
 
@@ -61,34 +59,42 @@ lx_grow_heap(heap_context_t* heap, size_t sz);
 
 int
 kalloc_init() {
-    __kalloc_kheap.start = &__kernel_heap_start;
-    __kalloc_kheap.brk = NULL;
-    __kalloc_kheap.max_addr = (void*)K_STACK_START;
+    heap_context_t* kheap = &__current->mm.k_heap;
+    kheap->start = &__kernel_heap_start;
+    kheap->brk = NULL;
+    kheap->max_addr = (void*)KSTACK_START;
 
-    if (!dmm_init(&__kalloc_kheap)) {
+    if (!dmm_init(kheap)) {
         return 0;
     }
 
-    SW(__kalloc_kheap.start, PACK(4, M_ALLOCATED));
-    SW(__kalloc_kheap.start + WSIZE, PACK(0, M_ALLOCATED));
-    __kalloc_kheap.brk += WSIZE;
+    SW(kheap->start, PACK(4, M_ALLOCATED));
+    SW(kheap->start + WSIZE, PACK(0, M_ALLOCATED));
+    kheap->brk += WSIZE;
 
-    return lx_grow_heap(&__kalloc_kheap, HEAP_INIT_SIZE) != NULL;
+    return lx_grow_heap(kheap, HEAP_INIT_SIZE) != NULL;
 }
 
 void*
 lxmalloc(size_t size) {
-    return lx_malloc_internal(&__kalloc_kheap, size);
+    return lx_malloc_internal(&__current->mm.k_heap, size);
 }
 
 void*
-lxcalloc(size_t size) {
-    void* ptr = lxmalloc(size);
+lxcalloc(size_t n, size_t elem) {
+    size_t pd = n * elem;
+
+    // overflow detection
+    if (pd < elem || pd < n) {
+        return NULL;
+    }
+
+    void* ptr = lxmalloc(pd);
     if (!ptr) {
         return NULL;
     }
 
-    return memset(ptr, 0, size);
+    return memset(ptr, 0, pd);
 }
 
 void