Rough skeleton for VGA graphics driver

Author: scopeInfinity

Makefile

@@ -135,9 +135,10 @@ include $(SRC_KERNEL)/process/Makefile.mk
 include $(SRC_KERNEL)/syscall/Makefile.mk
 
 include $(SRC_DRIVERS)/disk/Makefile.mk
-include $(SRC_DRIVERS)/display/Makefile.mk
 include $(SRC_DRIVERS)/keyboard/Makefile.mk
 include $(SRC_DRIVERS)/pic/Makefile.mk
+include $(SRC_DRIVERS)/display/Makefile.mk
+include $(SRC_DRIVERS)/display/vga/Makefile.mk
 
 include $(SRC_DIR)/fs/Makefile.mk
 include $(SRC_DIR)/memmgr/tables/Makefile.mk

include/fuzzy/drivers/display/vga/graphics.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#define GRAPHICS_HEIGHT  640
+#define GRAPHICS_WIDTH   480
+
+// following functions doesn't verify arguments
+inline void draw_pixel(int x, int y, int color);
+inline void draw_char(int x, int y, int fnt_size, int color);
+// x1<=x2, y1<=y2
+inline void draw_rectangle(int x1, int y1, int x2, int y2, int color);
+inline void draw_ellipse(int x1, int y1, int x2, int y2, int color);
+
+void graphics_flush();

include/fuzzy/memmgr/layout.h

@@ -5,6 +5,8 @@
 #define STACKINIT_APP           (MEMORY_APP_SIZE-4)
 #define MEMORY_REALLIBRARY_DATA_ADDRESS  0x70000
 #define MEMORY_REALLIBRARY_DATA_SIZE     0x10000
+#define MEMORY_VGA_GRAPHICS_ADDRESS      0xA0000
+#define MEMORY_VGA_GRAPHICS_SIZE         0x10000
 
 // END_ENSURE_SAME_layout_asm
 

src/drivers/display/vga/Makefile.mk

@@ -0,0 +1,13 @@
+
+$(SELF_BUILD_DIR)/%.o: $(SELF_SRC_DIR)/%.c $(BUILD_USR_INCLUDE_ALL)
+	mkdir -p $(dir $@)
+	$(KERNEL_CC) -c -o $@ \
+		$<
+
+$(SELF_BUILD_DIR)/%_asm.o: $(SELF_SRC_DIR)/%.asm
+	mkdir -p $(dir $@)
+	nasm -o $@ -f elf32 $<
+
+$(SELF_BUILD_DIR)/libvga_graphics: $(SELF_BUILD_ALL_C) $(SELF_BUILD_ALL_ASM)
+	ar rc $@ $^
+

src/drivers/display/vga/graphics.c

@@ -0,0 +1,18 @@
+#include<fuzzy/drivers/display/vga/graphics.h>
+#include<fuzzy/kernel/process/process.h>
+#include<fuzzy/memmgr/tables/gdt.h>
+#include<fuzzy/memmgr/layout.h>
+
+#include <stddef.h>
+
+// FIX: large buffer size, looks like we need to move kernel.
+static uint16_t buffer[GRAPHICS_HEIGHT][GRAPHICS_WIDTH] = {0};
+
+void graphics_flush() {
+    kernel_memncpy_absolute(
+        GDT_ABS32_DS, // dst ds
+        MEMORY_VGA_GRAPHICS_ADDRESS, // dst address
+        GDT_KERNEL_DS, // src ds
+        buffer, // src address
+        MEMORY_VGA_GRAPHICS_SIZE); // FIX: doesn't match
+}

src/kernel/Makefile.mk

@@ -25,6 +25,7 @@ $(kernel_core).elf: $(SELF_BUILD_DIR)/core_asm.o \
 		$(BUILD_DRIVERS)/pic/libpic \
 		$(BUILD_LIB_UTILS)/libutils \
 		$(BUILD_DRIVERS)/display/libtm_vga \
+		$(BUILD_DRIVERS)/display/vga/libvga_graphics \
 		$(BUILD_LIB_DS)/libds \
 		$(BUILD_DRIVERS)/disk/libdisk \
 		$(BUILD_DIR)/real_mode/librealmodeclient \