Syscall to get info for bootloader loaded files

coderarjob · Dec 6, 2024 · 6f74308 · 6f74308
1 parent 3229e45
commit 6f74308
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Showing 3 changed files with 43 additions and 4 deletions.
diff --git a/include/cm/cm.h b/include/cm/cm.h
@@ -25,12 +25,16 @@ INT snprintf (CHAR* dest, size_t size, const CHAR* fmt, ...);
 INT vsnprintf (CHAR* dest, size_t size, const CHAR* fmt, va_list l);
 
 /***************************************************************************************************
- * Halts thread for 'ms' miliseconds
- *
- * @return      Nothing
- **************************************************************************************************/
+ * Misc functions
+ ***************************************************************************************************/
 void cm_delay (UINT ms);
 
+static inline void cm_get_bootloaded_file (const char* const filename,
+                                           OSIF_BootLoadedFiles* const out)
+{
+    syscall (OSIF_SYSCALL_GET_BOOTLOADED_FILE, (U32)filename, (U32)out, 0, 0, 0);
+}
+
 /***************************************************************************************************
  * Process management
  ***************************************************************************************************/

diff --git a/include/cm/osif.h b/include/cm/osif.h
@@ -32,6 +32,7 @@ typedef enum OSIF_SYSCALLS {
     OSIF_SYSCALL_WINDOW_GET_WINDOW_FB      = 12,
     OSIF_SYSCALL_WINDOW_FLUSH_GRAPHICS     = 13,
     OSIF_SYSCALL_GET_OS_ERROR              = 14,
+    OSIF_SYSCALL_GET_BOOTLOADED_FILE       = 15,
 } OSIF_SYSCALLS;
 
 typedef enum OSIF_ProcessEvents {
@@ -45,3 +46,8 @@ typedef struct OSIF_ProcessEvent {
     OSIF_ProcessEvents event;
     U64 data;
 } OSIF_ProcessEvent;
+
+typedef struct OSIF_BootLoadedFiles {
+    void* startLocation;
+    U16 length;
+} OSIF_BootLoadedFiles;
diff --git a/src/kernel/x86/syscalls.c b/src/kernel/x86/syscalls.c
@@ -17,6 +17,10 @@
 #include <handle.h>
 #include <panic.h>
 #include <cm/osif.h>
+#if ARCH == x86
+    #include <x86/paging.h>
+    #include <x86/boot.h>
+#endif
 
 typedef struct SystemcallFrame {
     U32 ebp;
@@ -51,6 +55,11 @@ bool ksys_getWindowFB (SystemcallFrame frame, Handle h, OSIF_WindowFrameBufferIn
 void ksys_window_graphics_flush_all (SystemcallFrame frame);
 #endif // GRAPHICS_MODE_ENABLED
 
+#if ARCH == x86
+void ksys_find_bootloaded_file (SystemcallFrame frame, const char* const filename,
+                                OSIF_BootLoadedFiles* const file);
+#endif // ARCH = x86
+
 static U32 s_getSysCallCount();
 static INT s_handleInvalidSystemCall();
 
@@ -95,6 +104,12 @@ void* g_syscall_table[] = {
 #endif
     //---------------------------
     &sys_get_os_error,               // 14
+    //---------------------------
+#if ARCH == x86
+    &ksys_find_bootloaded_file,      // 15
+#else
+    &s_handleInvalidSystemCall,      // 15
+#endif
 };
 #pragma GCC diagnostic pop
 
@@ -370,3 +385,17 @@ void ksys_window_graphics_flush_all (SystemcallFrame frame)
     kcompose_flush();
 }
 #endif // GRAPHICS_MODE_ENABLED
+
+#if ARCH == x86
+void ksys_find_bootloaded_file (SystemcallFrame frame, const char* const filename,
+                                OSIF_BootLoadedFiles* const file)
+{
+    FUNC_ENTRY ("Frame return address: %x:%x", frame.cs, frame.eip);
+    (void)frame;
+
+    BootFileItem fileinfo = kboot_findBootFileItem (filename);
+    file->length          = fileinfo.length;
+    Physical start        = PHYSICAL (fileinfo.startLocation);
+    file->startLocation   = HIGHER_HALF_KERNEL_TO_VA (start);
+}
+#endif // ARCH = x86