kern: cons: Add console string writing routine

Signed-off-by: Ian Moffett <ian@osmora.org>

3 files changed, 116 insertions, 0 deletions

diff --git a/src/sys/include/io/cons/cons.h b/src/sys/include/io/cons/cons.h
index 3f95cc0..7b0543e 100644
--- a/src/sys/include/io/cons/cons.h
+++ b/src/sys/include/io/cons/cons.h
@@ -32,9 +32,14 @@
 
 #include <sys/types.h>
 #include <sys/bootvars.h>
+#include <os/spinlock.h>
 
 struct cons_scr {
+    struct spinlock lock;
     struct bootvar_fb fbvars;
+    size_t text_x;
+    size_t text_y;
+    size_t max_col;
     uint32_t scr_bg;
     uint32_t scr_fg;
 };
@@ -51,4 +56,16 @@ extern struct cons_scr g_root_scr;
  */
 int cons_init(void);
 
+/*
+ * Write a string onto the screen
+ *
+ * @scr: Screen to write on
+ * @str: String to write onto the screen
+ * @len: Length of string to write
+ *
+ * Returns the number of bytes written on success,
+ * otherwise a less than zero value to indicate failure.
+ */
+ssize_t cons_putstr(struct cons_scr *scr, const char *str, size_t len);
+
 #endif  /* !_CONS_CONS_H_ */
diff --git a/src/sys/include/io/cons/consvar.h b/src/sys/include/io/cons/consvar.h
new file mode 100644
index 0000000..c4d7b5c
--- /dev/null
+++ b/src/sys/include/io/cons/consvar.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CONS_CONVAR_H_
+#define _CONS_CONSVAR_H_
+
+#include <sys/types.h>
+
+/*
+ * Represents a printable character.
+ *
+ * @c: Actual character to print
+ * @x: X position
+ * @y: Y position
+ * @bg: Background color
+ * @fg: Foreground color
+ */
+struct cons_ch {
+    char c;
+    uint32_t x;
+    uint32_t y;
+    uint32_t bg;
+    uint32_t fg;
+};
+
+#endif  /* !_CONS_CONSVAR_H_ */
diff --git a/src/sys/include/io/cons/font.h b/src/sys/include/io/cons/font.h
new file mode 100644
index 0000000..b16c279
--- /dev/null
+++ b/src/sys/include/io/cons/font.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CONS_FONT_H_
+#define _CONS_FONT_H_ 1
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#define FONT_HDRLEN (sizeof(struct font_header))
+#define PSF1_MAGIC 0x0436
+
+struct __packed font_header {
+    uint16_t magic;
+    uint8_t mode;
+    uint8_t csize;
+};
+
+extern uint8_t g_CONS_FONT[];
+
+#endif  /* !_CONS_FONT_H_ */