rewrite application stuff in the kernel to support multitasking

2 files changed, 53 insertions, 0 deletions

diff --git a/euler/source/euler/start_process.cpp b/euler/source/euler/start_process.cpp
new file mode 100644
index 0000000..64e16c5
--- /dev/null
+++ b/euler/source/euler/start_process.cpp
@@ -0,0 +1,35 @@
+#include <euler/start_process.hpp>
+#include <cstring>
+
+namespace euler {
+
+  start_process::start_process(const char *path)
+  : path(path), path_len(std::strlen(path)) {}
+
+  void start_process::add_env_variable(const char *name, const char *value) {
+    env_var_specs.push_back({
+      .name_len = std::strlen(name), .name = name,
+      .value_len = std::strlen(value), .value = value });
+  }
+
+  void start_process::gift_stream(
+    __euler_stream_handle to_gifter, __euler_stream_handle to_giftee) {
+    gift_stream_specs.push_back({
+      .stream_handle_to_gifter = to_gifter,
+      .stream_handle_to_giftee = to_giftee });
+  }
+
+  __euler_stream_result start_process::start(
+    __euler_process_handle &handle_out) {
+    __euler_process_start_info info = {
+      .file_path_length = path_len,
+      .file_path = path,
+      .env_var_count = env_var_specs.size(),
+      .env_vars = env_var_specs.data(),
+      .gift_stream_count = gift_stream_specs.size(),
+      .gift_streams = gift_stream_specs.data(),
+    };
+    return __euler_start_process(info, handle_out);
+  }
+
+}
diff --git a/euler/source/euler/syscall.asm b/euler/source/euler/syscall.asm
index 41bd05c..64f08f8 100644
--- a/euler/source/euler/syscall.asm
+++ b/euler/source/euler/syscall.asm
@@ -12,6 +12,8 @@ global __euler_read_from_stream
 global __euler_get_framebuffer
 global __euler_encode_color
 global __euler_get_input_packet
+global __euler_start_process
+global __euler_get_other_end_process_handle
 
 section .text
 
@@ -124,3 +126,19 @@ __euler_get_input_packet:
   mov byte [rdx], al
   mov al, 1
   ret
+
+__euler_start_process:
+  push rsi
+  mov rax, 16
+  syscall
+  pop rsi
+  mov qword [rsi], rdi
+  ret
+
+__euler_get_other_end_process_handle:
+  push rsi
+  mov rax, 19
+  syscall
+  pop rsi
+  mov qword [rsi], rdi
+  ret