arch: i386: add a spinlock implementation

Add two functions to control thread-local spinlocks.

Signed-off-by: Danny Holman <dholman@gymli.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/include/kernel/video/framebuffer.h b/include/kernel/video/framebuffer.h
new file mode 100644
index 0000000..500e71b
--- /dev/null
+++ b/include/kernel/video/framebuffer.h
@@ -0,0 +1,23 @@
+#ifndef KERNEL_FRAMEBUFFER_H
+#define KERNEL_FRAMEBUFFER_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#define VGA_WIDTH       80
+#define VGA_HEIGHT      25
+
+static uint16_t *const VGA_MEMORY = (uint16_t*)0xC03FF000;
+
+void fb_init(void);
+void fb_setcolor(uint8_t color);
+void fb_putchar(char c);
+void fb_setpos(int x, int y);
+void fb_offsetpos(int dx, int dy);
+
+static inline void fb_write(const char *data, size_t size) {
+        for (size_t i = 0; i < size; i++)
+                fb_putchar(data[i]);
+}
+
+#endif