Enable and test other VGA resolutions.

mentos/inc/io/vga/vga.h

@@ -11,6 +11,9 @@ void vga_initialize();
 /// @brief Finalizes the VGA.
 void vga_finalize();
 
+/// @brief Updates the graphic elements.
+void vga_update();
+
 /// @brief Checks if the VGA is enabled.
 /// @return 1 if enabled, 0 otherwise.
 int vga_is_enabled();
@@ -49,7 +52,7 @@ void vga_draw_char(int x, int y, unsigned char c, unsigned char color);
 /// @param y y-axis position.
 /// @param str string to draw.
 /// @param color color of the character.
-void vga_draw_string(int x, int y, char *str, unsigned char color);
+void vga_draw_string(int x, int y, const char *str, unsigned char color);
 
 /// @brief Draws a line from point 1 to point 2.
 /// @param x0 point 1 x-axis position.
@@ -84,4 +87,33 @@ void vga_draw_circle(int xc, int yc, int r, unsigned char color);
 /// @param color used to draw the triangle.
 void vga_draw_triangle(int x1, int y1, int x2, int y2, int x3, int y3, unsigned char color);
 
+/// @brief Print the given character on the screen.
+/// @param c The character to print.
+void vga_putc(int c);
+
+/// @brief Prints the given string on the screen.
+/// @param str The string to print.
+void vga_puts(const char *str);
+
+/// @brief Move the cursor at the position x, y on the screen.
+/// @param x The x coordinate.
+/// @param y The y coordinate.
+void vga_move_cursor(unsigned int x, unsigned int y);
+
+/// @brief Returns cursor's position on the screen.
+/// @param x The output x coordinate.
+/// @param y The output y coordinate.
+void vga_get_cursor_position(unsigned int * x, unsigned int * y);
+
+/// @brief Returns screen size.
+/// @param width The screen width.
+/// @param height The screen height.
+void vga_get_screen_size(unsigned int * width, unsigned int * height);
+
+/// @brief Move to the following line (the effect of \n character).
+void vga_new_line();
+
+/// @brief Change the color.
+void vga_set_color(unsigned int color);
+
 void vga_run_test();

mentos/inc/io/vga/vga_palette.h

@@ -14,22 +14,22 @@ typedef struct {
 
 /// 16 color palette.
 palette_entry_t ansi_16_palette[17] = {
-    { 0x00, 0x00, 0x00 }, // Black
+    { 0x00, 0x00, 0x00 }, //  0 Black
-    { 0xAA, 0x00, 0x00 }, // Red
+    { 0xAA, 0x00, 0x00 }, //  1 Red
-    { 0x00, 0xAA, 0x00 }, // Green
+    { 0x00, 0xAA, 0x00 }, //  2 Green
-    { 0xAA, 0xAA, 0x00 }, // Yellow
+    { 0xAA, 0xAA, 0x00 }, //  3 Yellow
-    { 0x00, 0x00, 0xAA }, // Blue
+    { 0x00, 0x00, 0xAA }, //  4 Blue
-    { 0xAA, 0x00, 0xAA }, // Magenta
+    { 0xAA, 0x00, 0xAA }, //  5 Magenta
-    { 0x00, 0xAA, 0xAA }, // Cyan
+    { 0x00, 0xAA, 0xAA }, //  6 Cyan
-    { 0xAA, 0xAA, 0xAA }, // White
+    { 0xAA, 0xAA, 0xAA }, //  7 White
-    { 0x55, 0x55, 0x55 }, // Black
+    { 0x55, 0x55, 0x55 }, //  8 Black
-    { 0xFF, 0x55, 0x55 }, // Red
+    { 0xFF, 0x55, 0x55 }, //  9 Red
-    { 0x55, 0xFF, 0x55 }, // Green
+    { 0x55, 0xFF, 0x55 }, // 10 Green
-    { 0xFF, 0xFF, 0x55 }, // Yellow
+    { 0xFF, 0xFF, 0x55 }, // 11 Yellow
-    { 0x55, 0x55, 0xFF }, // Blue
+    { 0x55, 0x55, 0xFF }, // 12 Blue
-    { 0xFF, 0x55, 0xFF }, // Magenta
+    { 0xFF, 0x55, 0xFF }, // 13 Magenta
-    { 0x55, 0xFF, 0xFF }, // Cyan
+    { 0x55, 0xFF, 0xFF }, // 14 Cyan
-    { 0xFF, 0xFF, 0xFF }, // White
+    { 0xFF, 0xFF, 0xFF }, // 15 White
 };
 
 /// 256 color palette.

mentos/inc/io/video.h

@@ -66,6 +66,9 @@
 /// @brief Initialize the video.
 void video_init();
 
+/// @brief Updates the video.
+void video_update();
+
 /// @brief Print the given character on the screen.
 /// @param c The character to print.
 void video_putc(int c);
@@ -82,6 +85,16 @@ void video_set_cursor_auto();
 /// @param y The y coordinate.
 void video_move_cursor(unsigned int x, unsigned int y);
 
+/// @brief Returns cursor's position on the screen.
+/// @param x The output x coordinate.
+/// @param y The output y coordinate.
+void video_get_cursor_position(unsigned int * x, unsigned int * y);
+
+/// @brief Returns screen size.
+/// @param width The screen width.
+/// @param height The screen height.
+void video_get_screen_size(unsigned int * width, unsigned int * height);
+
 /// @brief Clears the screen.
 void video_clear();
 
@@ -91,14 +104,6 @@ void video_new_line();
 /// @brief Move to the up line (the effect of \n character).
 void video_cartridge_return();
 
-/// @brief Get the current column number.
-/// @return The column number.
-uint32_t video_get_x();
-
-/// @brief Get the current row number.
-/// @return The row number.
-uint32_t video_get_y();
-
 /// @brief The whole screen is shifted up by one line. Used when the cursor
 ///        reaches the last position of the screen.
 void video_shift_one_line_up();

mentos/src/hardware/timer.c

@@ -16,9 +16,10 @@
 #include "process/scheduler.h"
 #include "hardware/pic8259.h"
 #include "io/port_io.h"
+#include "io/debug.h"
+#include "io/video.h"
 #include "stdint.h"
 #include "mem/kheap.h"
-#include "io/debug.h"
 #include "process/wait.h"
 #include "drivers/rtc.h"
 #include "descriptor_tables/isr.h"
@@ -26,7 +27,6 @@
 #include "system/signal.h"
 #include "assert.h"
 #include "sys/errno.h"
-#include "io/vga/vga.h"
 
 /// @defgroup picregs Programmable Interval Timer Registers
 /// @brief The list of registers used to set the PIT.
@@ -108,6 +108,8 @@ void timer_handler(pt_regs *reg)
     run_timer_softirq();
     // Perform the schedule.
     scheduler_run(reg);
+    // Update graphics.
+    video_update();
     // Restore fpu state.
     unswitch_fpu();
     // The ack is sent to PIC only when all handlers terminated!

mentos/src/io/vga/vga.c

@@ -19,6 +19,7 @@
 #include "hardware/timer.h"
 #include "io/port_io.h"
 #include "io/debug.h"
+#include "io/video.h"
 #include "stdbool.h"
 #include "string.h"
 #include "math.h"
@@ -73,7 +74,7 @@ typedef struct {
 
 /// VGA font details.
 typedef struct {
-    unsigned char *font; ///< Pointer to the array holding the shape of each character.
+    const unsigned char *font; ///< Pointer to the array holding the shape of each character.
     unsigned width;            ///< Width of the font.
     unsigned height;           ///< Height of the font.
 } vga_font_t;
@@ -539,16 +540,6 @@ unsigned int vga_read_pixel(int x, int y)
     return driver->ops->read_pixel(x, y);
 }
 
-void vga_clear_screen()
-{
-    unsigned original_plane = __get_plane();
-    for (unsigned plane = 0; plane < 4; ++plane) {
-        __set_plane(plane);
-        memset(driver->address, 0, 64 * 1024);
-    }
-    __set_plane(original_plane);
-}
-
 void vga_draw_char(int x, int y, unsigned char c, unsigned char color)
 {
     static unsigned mask[] = {
@@ -562,7 +553,7 @@ void vga_draw_char(int x, int y, unsigned char c, unsigned char color)
         1u << 7u, //          128
         1u << 8u, //          256
     };
-    unsigned char *glyph = driver->font->font + c * driver->font->height;
+    const unsigned char *glyph = driver->font->font + c * driver->font->height;
     for (unsigned cy = 0; cy < driver->font->height; ++cy) {
         for (unsigned cx = 0; cx < driver->font->width; ++cx) {
             vga_draw_pixel(x + (driver->font->width - cx), y + cy, glyph[cy] & mask[cx] ? color : 0x00u);
@@ -570,7 +561,7 @@ void vga_draw_char(int x, int y, unsigned char c, unsigned char color)
     }
 }
 
-void vga_draw_string(int x, int y, char *str, unsigned char color)
+void vga_draw_string(int x, int y, const char *str, unsigned char color)
 {
     char i = 0;
     while (*str != '\0') {
@@ -689,16 +680,28 @@ static vga_ops_t ops_320_200_256 = {
     .fill_rect   = NULL,
 };
 
+static vga_font_t font_4x6 = {
+    .font   = arr_4x6_font,
+    .width  = 4,
+    .height = 6,
+};
+
+static vga_font_t font_5x6 = {
+    .font   = arr_5x6_font,
+    .width  = 5,
+    .height = 6,
+};
+
 static vga_font_t font_8x8 = {
     .font   = arr_8x8_font,
     .width  = 8,
     .height = 8,
 };
 
-static vga_font_t font_8x8_basic = {
+static vga_font_t font_8x14 = {
-    .font   = arr_8x8_basic_font,
+    .font   = arr_8x14_font,
     .width  = 8,
-    .height = 8,
+    .height = 14,
 };
 
 static vga_font_t font_8x16 = {
@@ -739,34 +742,39 @@ void vga_initialize()
     __save_palette(stored_palette, 256);
 
     // Initialize the desired mode.
-#if defined(VGA_MODE_320_200_256)
+
+#if defined(VGA_MODE_320_200_256) // 40x25
     // Write the registers.
     __set_mode(&_mode_320_200_256);
     // Initialize the mode.
     driver = &driver_320_200_256;
     // Load the color palette.
     __load_palette(ansi_256_palette, 256);
-#elif defined(VGA_MODE_640_480_16)
+    // Set the font.
+    driver->font = &font_5x6;
+#elif defined(VGA_MODE_640_480_16) // 80x60
     // Write the registers.
     __set_mode(&_mode_640_480_16);
     // Initialize the mode.
     driver = &driver_640_480_16;
     // Load the color palette.
     __load_palette(ansi_16_palette, 16);
-#elif defined(VGA_MODE_720_480_16)
+    // Set the font.
+    driver->font = &font_8x14;
+#elif defined(VGA_MODE_720_480_16) // 90x60
     // Write the registers.
     __set_mode(&_mode_720_480_16);
     // Initialize the mode.
     driver = &driver_720_480_16;
     // Load the color palette.
     __load_palette(ansi_16_palette, 16);
+    // Set the font.
+    driver->font = &font_8x16;
 #else                              // VGA_TEXT_MODE
     return;
 #endif
     // Set the address.
     driver->address = __get_seg();
-    // Set the font.
-    driver->font = &font_8x8;
     // Save the content of the memory.
     memcpy(vidmem, driver->address, 0x4000);
     // Clears the screen.
@@ -782,3 +790,104 @@ void vga_finalize()
     __load_palette(stored_palette, 256);
     vga_enable = false;
 }
+
+static int _x               = 0;
+static int _y               = 0;
+static unsigned char _color = 7;
+static int _cursor_state    = 0;
+
+inline static void __vga_clear_cursor()
+{
+    for (unsigned cy = 0; cy < driver->font->height; ++cy)
+        for (unsigned cx = 0; cx < driver->font->width; ++cx)
+            vga_draw_pixel(_x + cx, _y + cy, 0);
+}
+
+inline static void __vga_draw_cursor()
+{
+    unsigned char color = (_cursor_state = (_cursor_state == 0)) * _color;
+    for (unsigned cy = 0; cy < driver->font->height; ++cy)
+        for (unsigned cx = 0; cx < driver->font->width; ++cx)
+            vga_draw_pixel(_x + cx, _y + cy, color);
+}
+
+void vga_putc(int c)
+{
+    if (_cursor_state)
+        __vga_clear_cursor();
+    // If the character is '\n' go the new line.
+    if (c == '\n') {
+        vga_new_line();
+    } else if ((c >= 0x20) && (c <= 0x7E)) {
+        vga_draw_char(_x, _y, c, _color);
+        if ((_x += driver->font->width) >= driver->width)
+            vga_new_line();
+    } else {
+        return;
+    }
+}
+
+void vga_puts(const char *str)
+{
+    while ((*str) != 0) {
+        vga_putc((*str++));
+    }
+}
+
+void vga_move_cursor(unsigned int x, unsigned int y)
+{
+    _x = x * driver->font->width;
+    _y = y * driver->font->height;
+    __vga_draw_cursor();
+}
+
+void vga_get_cursor_position(unsigned int *x, unsigned int *y)
+{
+    if (x)
+        *x = _x / driver->font->width;
+    if (y)
+        *y = _y / driver->font->height;
+}
+
+void vga_get_screen_size(unsigned int *width, unsigned int *height)
+{
+    if (width)
+        *width = driver->width / driver->font->width;
+    if (height)
+        *height = driver->height / driver->font->height;
+}
+
+void vga_clear_screen()
+{
+    unsigned original_plane = __get_plane();
+    for (unsigned plane = 0; plane < 4; ++plane) {
+        __set_plane(plane);
+        memset(driver->address, 0, 64 * 1024);
+    }
+    __set_plane(original_plane);
+    _x = 0, _y = 0;
+}
+
+void vga_new_line()
+{
+    // Just the 5x6 font needs some space.
+    const unsigned int vertical_space = (driver->font == &font_5x6);
+    // Go back at the beginning of the line.
+    _x = 0;
+    if ((_y += driver->font->height + vertical_space) >= (driver->height - driver->font->height)) {
+        _y = 0;
+        vga_clear_screen();
+    }
+}
+
+void vga_update()
+{
+    if ((timer_get_ticks() % (TICKS_PER_SECOND / 2)) == 0) {
+        __vga_draw_cursor();
+    }
+}
+
+void vga_set_color(unsigned int color)
+{
+    _color = color;
+}

mentos/src/io/video.c

@@ -5,6 +5,7 @@
 
 #include "io/port_io.h"
 #include "io/video.h"
+#include "io/vga/vga.h"
 #include "stdbool.h"
 #include "ctype.h"
 #include "string.h"
@@ -68,7 +69,7 @@ ansi_color_map[] = {
 /// Pointer to a position of the screen writer.
 char *pointer = ADDR;
 /// The current color.
-char color = 7;
+unsigned char color = 7;
 /// Used to write on the escape_buffer. If -1, we are not parsing an escape sequence.
 int escape_index = -1;
 /// Used to store an escape sequence.
@@ -80,9 +81,18 @@ char original_page[TOTAL_SIZE] = { 0 };
 /// Determines if the screen is currently scrolled.
 int scrolled_page = 0;
 
-void video_init()
+/// @brief Get the current column number.
+/// @return The column number.
+static inline unsigned __get_x()
 {
-    video_clear();
+    return ((pointer - ADDR) % (WIDTH * 2)) / 2;
+}
+
+/// @brief Get the current row number.
+/// @return The row number.
+static inline unsigned __get_y()
+{
+    return (pointer - ADDR) / (WIDTH * 2);
 }
 
 /// @brief Draws the given character.
@@ -160,9 +170,22 @@ static inline void __video_set_cursor(unsigned int x, unsigned int y)
     outportb(0x3D5, (uint8_t)((position >> 8U) & 0xFFU));
 }
 
+void video_init()
+{
+    video_clear();
+}
+
+void video_update()
+{
+#ifndef VGA_TEXT_MODE
+    if (vga_is_enabled())
+        vga_update();
+#endif
+}
+
 void video_putc(int c)
 {
-    // == ESCAPE SEQUENCES ========================================================================
+    // ESCAPE SEQUENCES
     if (c == '\033') {
         escape_index = 0;
         return;
@@ -189,6 +212,13 @@ void video_putc(int c)
         return;
     }
 
+#ifndef VGA_TEXT_MODE
+    if (vga_is_enabled()) {
+        vga_putc(c);
+        return;
+    }
+#endif
+
     // == NORMAL CHARACTERS =======================================================================
     // If the character is '\n' go the new line.
     if (c == '\n') {
@@ -212,6 +242,12 @@ void video_putc(int c)
 
 void video_puts(const char *str)
 {
+#ifndef VGA_TEXT_MODE
+    if (vga_is_enabled()) {
+        vga_puts(str);
+        return;
+    }
+#endif
     while ((*str) != 0) {
         video_putc((*str++));
     }
@@ -219,23 +255,73 @@ void video_puts(const char *str)
 
 void video_set_cursor_auto()
 {
+#ifndef VGA_TEXT_MODE
+    if (vga_is_enabled())
+        return;
+#endif
     __video_set_cursor(((pointer - ADDR) / 2U) / WIDTH, ((pointer - ADDR) / 2U) % WIDTH);
 }
 
 void video_move_cursor(unsigned int x, unsigned int y)
 {
+#ifndef VGA_TEXT_MODE
+    if (vga_is_enabled()) {
+        vga_move_cursor(x, y);
+        return;
+    }
+#endif
     pointer = ADDR + ((y * WIDTH * 2) + (x * 2));
     video_set_cursor_auto();
 }
 
+void video_get_cursor_position(unsigned int *x, unsigned int *y)
+{
+#ifndef VGA_TEXT_MODE
+    if (vga_is_enabled()) {
+        vga_get_cursor_position(x, y);
+        return;
+    }
+#endif
+    if (x)
+        *x = __get_x();
+    if (y)
+        *y = __get_y();
+}
+
+void video_get_screen_size(unsigned int *width, unsigned int *height)
+{
+#ifndef VGA_TEXT_MODE
+    if (vga_is_enabled()) {
+        vga_get_screen_size(width, height);
+        return;
+    }
+#endif
+    if (width)
+        *width = WIDTH;
+    if (height)
+        *height = HEIGHT;
+}
+
 void video_clear()
 {
+#ifndef VGA_TEXT_MODE
+    if (vga_is_enabled()) {
+        vga_clear_screen();
+        return;
+    }
+#endif
     memset(upper_buffer, 0, STORED_PAGES * TOTAL_SIZE);
     memset(ADDR, 0, TOTAL_SIZE);
 }
 
 void video_new_line()
 {
+#ifndef VGA_TEXT_MODE
+    if (vga_is_enabled()) {
+        vga_new_line();
+        return;
+    }
+#endif
     pointer = ADDR + ((pointer - ADDR) / W2 + 1) * W2;
     video_shift_one_line_up();
     video_set_cursor_auto();
@@ -243,22 +329,18 @@ void video_new_line()
 
 void video_cartridge_return()
 {
+#ifndef VGA_TEXT_MODE
+    if (vga_is_enabled()) {
+        vga_new_line();
+        return;
+    }
+#endif
     pointer = ADDR + ((pointer - ADDR) / W2 - 1) * W2;
     video_new_line();
     video_shift_one_line_up();
     video_set_cursor_auto();
 }
 
-uint32_t video_get_x()
-{
-    return ((pointer - ADDR) % (WIDTH * 2)) / 2;
-}
-
-uint32_t video_get_y()
-{
-    return ((pointer - ADDR) / (WIDTH * 2));
-}
-
 void video_shift_one_line_up(void)
 {
     if (pointer >= ADDR + TOTAL_SIZE) {
@@ -302,6 +384,7 @@ void video_shift_one_page_down(void)
         memcpy(ADDR, upper_buffer + (page_to_load * TOTAL_SIZE), TOTAL_SIZE);
     }
 }
+
 #if 0
 void video_scroll_up()
 {

mentos/src/kernel.c

@@ -85,15 +85,21 @@ boot_info_t boot_info;
 /// @brief Prints [OK] at the current row and column 60.
 static inline void print_ok()
 {
-    video_move_cursor(75, video_get_y());
+    unsigned y, width;
-    video_puts("[" FG_GREEN_BRIGHT "OK" FG_WHITE "]\n");
+    video_get_cursor_position(NULL, &y);
+    video_get_screen_size(&width, NULL);
+    video_move_cursor(width - 5, y);
+    video_puts("[OK]\n");
 }
 
 /// @brief Prints [FAIL] at the current row and column 60.
 static inline void print_fail()
 {
-    video_move_cursor(75, video_get_y());
+    unsigned y, width;
-    video_puts("[" FG_RED_BRIGHT "FAIL" FG_WHITE "]\n");
+    video_get_cursor_position(NULL, &y);
+    video_get_screen_size(&width, NULL);
+    video_move_cursor(width - 7, y);
+    video_puts("[FAIL]\n");
 }
 
 /// @brief Entry point of the kernel.