stos: bpal: Initialize BPAL handle

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

paw/stos/head/ke/bpal.h

@@ -25,7 +25,14 @@ typedef struct {
  */
 VOID KeBpalInit(VOID);
 
+/*
+ * Obtain the boot protocol handle
+ *
+ * @Result: Result is written here
+ */
+VOID KeBpalGetHandle(BPAL_HANDLE *Result);
+
 /* Backend init functions */
-VOID KeBpalLimineInit(VOID);
+VOID KeBpalLimineInit(BPAL_HANDLE *Handle);
 
 #endif  /* !_KE_BPAL_H_ */

paw/stos/ke/bpal/bpal.c

@@ -16,6 +16,18 @@
 #define BOOT_PROTO _BOOT_PROTO
 #endif  /* !_BOOT_PROTO */
 
+static BPAL_HANDLE BpalHandle;
+
+VOID
+KeBpalGetHandle(BPAL_HANDLE *Result)
+{
+    if (Result == NULL) {
+        return;
+    }
+
+    *Result = BpalHandle;
+}
+
 VOID
 KeBpalInit(VOID)
 {
@@ -24,7 +36,7 @@ KeBpalInit(VOID)
     switch (*BootProto) {
     case 'l':
         if (RtlMemCmp(BootProto, "limine", 6) == 0) {
-            KeBpalLimineInit();
+            KeBpalLimineInit(&BpalHandle);
             return;
         }
     }

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

@@ -13,6 +13,13 @@
 #define DTRACE(Fmt, ...) \
     TRACE("[ BPAL ]: " Fmt, ##__VA_ARGS__)
 
+/* HHDM request */
+static struct limine_hhdm_response *HHDMResp = NULL;
+static volatile struct limine_hhdm_request HHDMReq = {
+    .id = LIMINE_HHDM_REQUEST_ID,
+    .revision = 0
+};
+
 /* Bootloader information */
 static struct limine_bootloader_info_response *LoaderInfoResp = NULL;
 static volatile struct limine_bootloader_info_request LoaderInfoReq = {
@@ -28,10 +35,11 @@ static struct limine_bootloader_performance_request LoaderPerReq = {
 };
 
 VOID
-KeBpalLimineInit(VOID)
+KeBpalLimineInit(BPAL_HANDLE *Handle)
 {
     LoaderInfoResp = LoaderInfoReq.response;
     LoaderPerfResp = LoaderPerReq.response;
+    HHDMResp = HHDMReq.response;
 
     DTRACE(
         "slut handed control by %s %s\n",
@@ -48,4 +56,6 @@ KeBpalLimineInit(VOID)
         "handoff took %d usec\n",
         LoaderPerfResp->exec_usec
     );
+
+    Handle->KernelBase = HHDMResp->offset;
 }