Espresso 0.0.1f

lib/mm/paging.c

@@ -23,7 +23,7 @@ void paging_init(void)
   page_directory = (page_directory_entry_t*)alloc_page();
   memset(page_directory, 0, PAGE_SIZE);
 
-  /* Allocate and set up the first identity-mapped page table (0–4MB) */
+  /* Allocate and set up the first identity-mapped page table (0-4MB) */
   page_tables[0] = (page_table_entry_t*)alloc_page();
   memset(page_tables[0], 0, PAGE_SIZE);
   for (uint32_t i = 0; i < PAGE_TABLE_ENTRIES; i++)

lib/vector_extensions/sse.c

@@ -99,41 +99,43 @@ void sse2_add_int32_arrays(int32_t *dst, const int32_t *a, const int32_t *b, siz
 __attribute__((force_align_arg_pointer))
 void *sse2_memcpy(void *dst, const void *src, uint32_t n)
 {
-  uintptr_t i;
+  uint8_t *d = (uint8_t *)dst;
+  const uint8_t *s = (const uint8_t *)src;
+  uintptr_t i = 0;
 
-  /* Align to 16 bytes if necessary */
-  while (((uintptr_t)dst & 15) && n > 0)
+  /* Align destination to 16 bytes */
+  while (((uintptr_t)d & 15) && n > 0)
   {
-    *((uint8_t*)dst) = *((uint8_t*)src);
-    dst = (uint8_t*)dst + 1;
-    src = (uint8_t*)src + 1;
+    *d++ = *s++;
     n--;
   }
 
-  /* Copy 16-byte chunks with SSE2 */
-  for (i = 0; i + 15 < n; i += 16)
+  /* Use SSE2 for 16-byte aligned blocks */
+  for (; i + 15 < n; i += 16)
   {
     asm volatile (
-      "movdqa (%1), %%xmm0\n\t"  /* Load 16 bytes from source into xmm0 */
-      "movdqa %%xmm0, (%0)\n\t"  /* Store 16 bytes to destination */
+      "movdqa (%1), %%xmm0\n\t"
+      "movdqa %%xmm0, (%0)\n\t"
       :
-      : "r"(dst + i), "r"(src + i)
+      : "r"(d + i), "r"(s + i)
       : "xmm0", "memory"
     );
   }
 
-  /* Handle remaining bytes (less than 16) */
-  while (n > 0)
+  d += i;
+  s += i;
+  n -= i;
+
+  /* Copy any remaining bytes */
+  while (n--)
   {
-    *((uint8_t*)dst) = *((uint8_t*)src);
-    dst = (uint8_t*)dst + 1;
-    src = (uint8_t*)src + 1;
-    n--;
+    *d++ = *s++;
   }
 
-  return dst;  /* Return pointer to destination */
+  return dst;
 }
 
+
 __attribute__((force_align_arg_pointer))
 char *sse2_strncpy(char *dest, const char *src, uint32_t n)
 {