feat! ddk -> libDDK, use syscall on AMD64.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

1 files changed, 76 insertions, 0 deletions

diff --git a/dev/libDDK/src/ddk_kernel_call.c b/dev/libDDK/src/ddk_kernel_call.c
new file mode 100644
index 00000000..1ac0a0aa
--- /dev/null
+++ b/dev/libDDK/src/ddk_kernel_call.c
@@ -0,0 +1,76 @@
+/* -------------------------------------------
+
+  DDK
+  Copyright Amlal El Mahrouss.
+
+  Author: Amlal El Mahrouss
+  Purpose: DDK kernel dispatch system.
+
+------------------------------------------- */
+
+#include <DriverKit/ddk.h>
+#include <stdarg.h>
+
+/// @brief this is an internal call, do not use it.
+DDK_EXTERN ATTRIBUTE(naked) void* __ke_call_dispatch(const int32_t name, int32_t cnt, void* data,
+                                                     size_t sz);
+/// @brief This function hashes the path into a FNV symbol.
+/// @param path the path to hash.
+/// @retval 0 symbol wasn't hashed.
+/// @retval > 0 hashed symbol.
+static uint64_t ddk_fnv_64(const char* path) {
+  if (path == nil || *path == 0) return 0;
+
+  const uint64_t kFnvOffsetBase = 0xcbf29ce484222325ULL;
+  const uint64_t kFnvPrime64    = 0x100000001b3ULL;
+
+  uint64_t hash = kFnvOffsetBase;
+
+  while (*path) {
+    hash ^= (char) (*path++);
+    hash *= kFnvPrime64;
+  }
+
+  return hash;
+}
+
+/// @brief Interrupt Kernel and call it's RPC.
+/// @param name RPC name
+/// @param cnt number of elements in **data** pointer.
+/// @param data data pointer.
+/// @param sz The size of the whole data pointer.
+/// @retval void* Kernel call was successful.
+/// @retval nil Kernel call failed, call KernelLastError(void)
+DDK_EXTERN void* ke_call_dispatch(const char* name, int32_t cnt, void* data, size_t sz) {
+  if (name == nil || *name == 0 || data == nil || cnt == 0) return nil;
+  return __ke_call_dispatch(ddk_fnv_64(name), cnt, data, sz);
+}
+
+/// @brief Add system call.
+/// @param slot system call slot
+/// @param slotFn, syscall slot.
+DDK_EXTERN void ke_set_syscall(const int slot, void (*slotFn)(void* a0)) {
+  ke_call_dispatch("ke_set_syscall", slot, slotFn, 1);
+}
+
+/// @brief Get a Kernel object.
+/// @param slot property id (always 0)
+/// @param name the object's name.
+/// @return Object manifest.
+DDK_EXTERN struct DDK_OBJECT_MANIFEST* ke_get_obj(const int slot, const char* name) {
+  struct DDK_OBJECT_MANIFEST* manifest =
+      (struct DDK_OBJECT_MANIFEST*) ke_call_dispatch("cfkit_get_kobj", slot, (void*) name, 1);
+
+  if (!manifest) return nil;
+
+  return manifest;
+}
+
+/// @brief Set a Kernel object.
+/// @param slot property id (always 0)
+/// @param name the object's name.
+/// @param ddk_pr pointer to a object's DDK_OBJECT_MANIFEST.
+/// @return property's object.
+DDK_EXTERN void* ke_set_obj(const int slot, const struct DDK_OBJECT_MANIFEST* ddk_pr) {
+  return ke_call_dispatch("cfkit_set_kobj", slot, (void*) ddk_pr, 1);
+}