From a8a80d326de9550b2a25b1255a2093ab43219ede Mon Sep 17 00:00:00 2001
From: Benji Dial <benji@benjidial.net>
Date: Sat, 27 Jan 2024 23:14:29 -0500
Subject: keyboard input

---
 kernel/syscall.cpp | 44 ++++++++++++++++++++++++--------------------
 1 file changed, 24 insertions(+), 20 deletions(-)

(limited to 'kernel/syscall.cpp')

diff --git a/kernel/syscall.cpp b/kernel/syscall.cpp
index 3c72d23..e194eb1 100644
--- a/kernel/syscall.cpp
+++ b/kernel/syscall.cpp
@@ -1,6 +1,7 @@
 #include <hilbert/kernel/application.hpp>
 #include <hilbert/kernel/framebuffer.hpp>
 #include <hilbert/kernel/paging.hpp>
+#include <hilbert/kernel/input.hpp>
 #include <hilbert/kernel/vfile.hpp>
 
 namespace hilbert::kernel::syscall {
@@ -82,7 +83,7 @@ namespace hilbert::kernel::syscall {
     set_zero(rax, rdi, rsi, rdx);
 
     vfile::vfile file;
-    switch (vfile::lookup_path(cp, file)) {
+    switch (vfile::lookup_path(cp, file, true)) {
     case storage::fs_result::success:
       break;
     case storage::fs_result::device_error:
@@ -96,28 +97,13 @@ namespace hilbert::kernel::syscall {
       return;
     }
 
-    vfile::vfile real_file;
-    switch (file.follow_symlinks(real_file)) {
-    case storage::fs_result::success:
-      break;
-    case storage::fs_result::device_error:
-      rax = file_result_device_error;
-      return;
-    case storage::fs_result::fs_corrupt:
-      rax = file_result_file_system_corrupt;
-      return;
-    case storage::fs_result::does_not_exist:
-      rax = file_result_does_not_exist;
-      return;
-    }
-
-    if (real_file.dir_entry.type != storage::file_type::regular_file) {
+    if (file.dir_entry.type != storage::file_type::regular_file) {
       rax = file_result_directory;
       return;
     }
 
     unsigned handler =
-      application::running_app->open_files.add_new(utility::move(real_file));
+      application::running_app->open_files.add_new(utility::move(file));
     rax = file_result_success;
     rdi = (uint64_t)handler;
 
@@ -226,6 +212,23 @@ namespace hilbert::kernel::syscall {
 
   }
 
+  void read_key_packet_syscall(
+    uint64_t &rax, uint64_t &rdi, uint64_t &rsi, uint64_t &rdx
+  ) {
+
+    set_zero(rax, rdi, rsi, rdx);
+
+    asm ("cli");
+
+    while (input::key_queue->count == 0)
+      asm ("sti\nhlt\ncli");
+
+    rax = (uint64_t)input::key_queue->take();
+
+    asm ("sti");
+
+  }
+
   typedef void (*syscall_handler)(
     uint64_t &rax, uint64_t &rdi, uint64_t &rsi, uint64_t &rdx);
 
@@ -237,10 +240,11 @@ namespace hilbert::kernel::syscall {
     &read_from_file_syscall,
     &end_this_process_syscall,
     &get_new_pages_syscall,
-    &close_file_syscall
+    &close_file_syscall,
+    &read_key_packet_syscall
   };
 
-  static constexpr int max_syscall_number = 7;
+  static constexpr int max_syscall_number = 8;
 
 }
 
-- 
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