From 4a7562c22a7365342754beed8fdebab0350bd256 Mon Sep 17 00:00:00 2001 From: Danny Holman Date: Fri, 16 Feb 2024 12:37:45 -0600 Subject: arch: i386: put framebuffer ops in own file Move all operations related to the x86 framebuffer into its own set of files. This makes the TTY layer more architecture agnostic. Signed-off-by: Danny Holman --- arch/i386/kernel/framebuffer.c | 105 +++++++++++++++++++++++++++++++++++++++++ arch/i386/kernel/tty.c | 88 ---------------------------------- 2 files changed, 105 insertions(+), 88 deletions(-) create mode 100644 arch/i386/kernel/framebuffer.c delete mode 100644 arch/i386/kernel/tty.c (limited to 'arch/i386/kernel') diff --git a/arch/i386/kernel/framebuffer.c b/arch/i386/kernel/framebuffer.c new file mode 100644 index 0000000..602bddb --- /dev/null +++ b/arch/i386/kernel/framebuffer.c @@ -0,0 +1,105 @@ +#include +#include +#include +#include +#include +#include + +static const size_t VGA_WIDTH = 80; +static const size_t VGA_HEIGHT = 25; +static uint16_t *const VGA_MEMORY = (uint16_t*)0xC03FF000; + +static size_t fb_row; +static size_t fb_column; +static uint8_t fb_color; +static uint16_t *framebuffer; + +void _enable_cursor(uint8_t cursor_start, uint8_t cursor_end) { + outb(0x3D4, 0x0A); + outb(0x3D5, (inb(0x3D5) & 0xC0) | cursor_start); + + outb(0x3D4, 0x0B); + outb(0x3D5, (inb(0x3D5) & 0xE0) | cursor_end); +} + +void _update_cursor(size_t x, size_t y) { + uint16_t pos = y * VGA_WIDTH + x; + + outb(0x3D4, 0x0F); + outb(0x3D5, (uint8_t)(pos & 0xFF)); + outb(0x3D4, 0x0E); + outb(0x3D5, (uint8_t)((pos >> 8) & 0xFF)); +} + +void _fb_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) { + const size_t index = y * VGA_WIDTH + x; + framebuffer[index] = vga_entry(c, color); +} + +void _fb_scroll(void) { + for (size_t i = 0; i < VGA_HEIGHT-1; i++) { + for (size_t j = 0; j < VGA_WIDTH; j++) + framebuffer[i * VGA_WIDTH + j] = VGA_MEMORY[(i+1) * VGA_WIDTH + j]; + } +} + +void fb_init(void) { + map_page(NULL, 0xB8000, (uintptr_t)VGA_MEMORY, 0x003); + + fb_row = 0; + fb_column = 0; + fb_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK); + framebuffer = VGA_MEMORY; + for (size_t y = 0; y < VGA_HEIGHT; y++) { + for (size_t x = 0; x < VGA_WIDTH; x++) + _fb_putentryat(' ', fb_color, x, y); + } + _enable_cursor(0, 0); + _update_cursor(0, 0); +} + +void fb_setcolor(uint8_t color) { + fb_color = color; +} + +void fb_setpos(int x, int y) { + fb_row = y; + fb_column = x; +} + +void fb_putchar(char c) { + unsigned char uc = c; + switch (uc) { + case '\r': + fb_column = 0; + break; + case '\n': + fb_column = 0; + if (++fb_row == VGA_HEIGHT) { + fb_row--; + _fb_scroll(); + } + break; + case '\t': + fb_column += 4; + if (++fb_column == VGA_WIDTH) { + fb_column = 4; + if (++fb_row == VGA_HEIGHT) { + fb_row--; + _fb_scroll(); + } + } + break; + default: + _fb_putentryat(uc, fb_color, fb_column, fb_row); + if (++fb_column == VGA_WIDTH) { + fb_column = 0; + if (++fb_row == VGA_HEIGHT) { + fb_row--; + _fb_scroll(); + } + } + break; + } + _update_cursor(fb_column, fb_row+1); +} diff --git a/arch/i386/kernel/tty.c b/arch/i386/kernel/tty.c deleted file mode 100644 index d2bba53..0000000 --- a/arch/i386/kernel/tty.c +++ /dev/null @@ -1,88 +0,0 @@ -#include -#include -#include -#include -#include - -static const size_t VGA_WIDTH = 80; -static const size_t VGA_HEIGHT = 25; -static uint16_t *const VGA_MEMORY = (uint16_t*)0xC03FF000; - -static size_t terminal_row; -static size_t terminal_column; -static uint8_t terminal_color; -static uint16_t *terminal_buffer; - -void tty_init(void) { - terminal_row = 0; - terminal_column = 0; - terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK); - terminal_buffer = VGA_MEMORY; - for (size_t y = 0; y < VGA_HEIGHT; y++) { - for (size_t x = 0; x < VGA_WIDTH; x++) { - const size_t index = y * VGA_WIDTH + x; - terminal_buffer[index] = vga_entry(' ', terminal_color); - } - } -} - -void tty_setcolor(uint8_t color) { - terminal_color = color; -} - -void tty_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) { - const size_t index = y * VGA_WIDTH + x; - terminal_buffer[index] = vga_entry(c, color); -} - -void terminal_scroll(void) { - for (size_t i = 0; i < VGA_HEIGHT; i++) { - for (size_t j = 0; j < VGA_WIDTH; j++) - terminal_buffer[i * VGA_WIDTH + j] = terminal_buffer[(i+1) * VGA_WIDTH + j]; - } -} - -void tty_putchar(char c) { - unsigned char uc = c; - switch (uc) { - case '\r': - terminal_column = 0; - break; - case '\n': - terminal_column = 0; - if (++terminal_row == VGA_HEIGHT) { - terminal_row--; - terminal_scroll(); - } - break; - case '\t': - terminal_column += 4; - if (++terminal_column == VGA_WIDTH) { - terminal_column = 4; - if (++terminal_row == VGA_HEIGHT) { - terminal_row--; - terminal_scroll(); - } - } - break; - default: - tty_putentryat(uc, terminal_color, terminal_column, terminal_row); - if (++terminal_column == VGA_WIDTH) { - terminal_column = 0; - if (++terminal_row == VGA_HEIGHT) { - terminal_row--; - terminal_scroll(); - } - } - break; - } -} - -void tty_write(const char *data, size_t size) { - for (size_t i = 0; i < size; i++) - tty_putchar(data[i]); -} - -void tty_writestring(const char *data) { - tty_write(data, strlen(data)); -} -- cgit v1.2.3