arch: i386: add a spinlock implementation

Add two functions to control thread-local spinlocks.

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

2 files changed, 56 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
diff --git a/include/kernel/video/vga.h b/include/kernel/video/vga.h
new file mode 100644
index 0000000..b639a3c
--- /dev/null
+++ b/include/kernel/video/vga.h
@@ -0,0 +1,33 @@
+#ifndef KERNEL_VGA_H
+#define KERNEL_VGA_H
+
+#include <stdint.h>
+
+enum vga_color {
+        VGA_COLOR_BLACK = 0,
+        VGA_COLOR_BLUE = 1,
+        VGA_COLOR_GREEN = 2,
+        VGA_COLOR_CYAN = 3,
+        VGA_COLOR_RED = 4,
+        VGA_COLOR_MAGENTA = 5,
+        VGA_COLOR_BROWN = 6,
+        VGA_COLOR_LIGHT_GREY = 7,
+        VGA_COLOR_DARK_GREY = 8,
+        VGA_COLOR_LIGHT_BLUE = 9,
+        VGA_COLOR_LIGHT_GREEN = 10,
+        VGA_COLOR_LIGHT_CYAN = 11,
+        VGA_COLOR_LIGHT_RED = 12,
+        VGA_COLOR_LIGHT_MAGENTA = 13,
+        VGA_COLOR_LIGHT_BROWN = 14,
+        VGA_COLOR_LIGHT_WHITE = 15,
+};
+
+static inline uint8_t vga_entry_color(enum vga_color fg, enum vga_color bg) {
+        return fg | bg << 4;
+}
+
+static inline uint16_t vga_entry(unsigned char uc, uint8_t color) {
+        return (uint16_t)uc | (uint16_t)color << 8;
+}
+
+#endif