From 21491514b3642a321ce65f2a07428f63c4d9feb5 Mon Sep 17 00:00:00 2001
From: Benji Dial <Benji3.141@gmail.com>
Date: Sun, 8 Nov 2020 11:11:49 -0500
Subject: manual viewer, "swap colors" system call

---
 src/user/include/pland/syscall.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'src/user/include/pland')

diff --git a/src/user/include/pland/syscall.h b/src/user/include/pland/syscall.h
index 14164aa..ead5fea 100644
--- a/src/user/include/pland/syscall.h
+++ b/src/user/include/pland/syscall.h
@@ -140,7 +140,8 @@ enum _scn {
   _SCN_PRINT_AT,
   _SCN_COUNT_OF_DIR,
   _SCN_CLEAR_SCREEN,
-  _SCN_SET_COLOR
+  _SCN_SET_COLOR,
+  _SCN_SWAP_COLOR
 };
 
 static inline uint32_t _sc0(enum _scn eax) {
@@ -285,4 +286,8 @@ static inline void _set_color(_vga_color_t color) {
   _sc1(_SCN_SET_COLOR, color);
 }
 
+static inline void _swap_color(uint8_t row, uint8_t col) {
+  _sc1(_SCN_SWAP_COLOR, (row << 8) | col);
+}
+
 #endif
\ No newline at end of file
-- 
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