stos: Add BPAL groundwork

Signed-off-by: Chloe M. <chloe@mensia.org>

paw/stos/head/ke/bpal.h

@@ -25,4 +25,7 @@ typedef struct {
  */
 VOID KeBpalInit(VOID);
 
+/* Backend init functions */
+VOID KeBpalLimineInit(VOID);
+
 #endif  /* !_KE_BPAL_H_ */

paw/stos/init/init.c

@@ -8,17 +8,21 @@
 
 #include <ex/trace.h>
 #include <ke/stos.h>
+#include <ke/bpal.h>
 #include <hal/serial.h>
 #include <stdef.h>
 
+#define DTRACE(Fmt, ...) \
+    TRACE("[ INIT ]: " Fmt, ##__VA_ARGS__)
+
 /*
  * Display a boot banner
  */
 static VOID
 BootBanner(VOID)
 {
-    TRACE("SystemPaw3 ~ %s\n", ST_VERSION);
-    TRACE("Booting SystemPaw3 !! <3\n");
+    TRACE("-- SystemPaw3 ~ %s --\n", ST_VERSION);
+    DTRACE("booting SystemPaw3 !! <3\n");
 }
 
 VOID
@@ -29,4 +33,7 @@ KiKernelEntry(VOID)
 
     /* Write the boot banner */
     BootBanner();
+
+    /* Initialize BPAL */
+    KeBpalInit();
 }

paw/stos/ke/bpal/bpal.c

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description:  Boot protocol abstraction layer
+ * Author:       Chloe M.
+ */
+
+#include <ke/bpal.h>
+#include <stdef.h>
+#include <string.h>
+
+#ifndef _BOOT_PROTO
+#error "Boot protocol must be defined"
+#else
+#define BOOT_PROTO _BOOT_PROTO
+#endif  /* !_BOOT_PROTO */
+
+VOID
+KeBpalInit(VOID)
+{
+    const CHAR *BootProto = BOOT_PROTO;
+
+    switch (*BootProto) {
+    case 'l':
+        if (RtlMemCmp(BootProto, "limine", 6) == 0) {
+            KeBpalLimineInit();
+            return;
+        }
+    }
+
+    /* TODO: PANIC HERE */
+}

paw/stos/ke/bpal/proto/limine.c

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description:  Boot protocol abstraction layer
+ * Author:       Chloe M.
+ */
+
+#include <ke/bpal.h>
+#include <ex/trace.h>
+#include <lib/limine.h>
+
+#define DTRACE(Fmt, ...) \
+    TRACE("[ BPAL ]: " Fmt, ##__VA_ARGS__)
+
+/* Bootloader information */
+static struct limine_bootloader_info_response *LoaderInfoResp = NULL;
+static volatile struct limine_bootloader_info_request LoaderInfoReq = {
+    .id = LIMINE_BOOTLOADER_INFO_REQUEST_ID,
+    .revision = 0
+};
+
+VOID
+KeBpalLimineInit(VOID)
+{
+    LoaderInfoResp = LoaderInfoReq.response;
+
+    DTRACE(
+        "slut handed control by %s %s\n",
+        LoaderInfoResp->name,
+        LoaderInfoResp->version
+    );
+}