diff options
Diffstat (limited to 'src/kernel.c')
| -rw-r--r-- | src/kernel.c | 91 |
1 files changed, 85 insertions, 6 deletions
diff --git a/src/kernel.c b/src/kernel.c index 615f02a..28b1dc8 100644 --- a/src/kernel.c +++ b/src/kernel.c @@ -4,6 +4,7 @@ This software is licensed under the ARPL. See LICENSE for details. */ #include <stdbool.h> #include <stddef.h> #include <stdint.h> +#include "font8x8_basic.h" /* check if compiler thinks we are targeting incorrect OS. */ #if defined(__linux__) @@ -15,6 +16,13 @@ This software is licensed under the ARPL. See LICENSE for details. */ #error "this operating system is only supported on ix86 targets. use an elf cross-compiler for ix86 targets, for example, i386-elf-gcc" #endif +static int term_col = 0; +static int term_row = 0; +static uint32_t *g_framebuffer = NULL; +static uint32_t g_width = 0; +static uint32_t g_height = 0; +static uint32_t g_default_color = 0xFFFFFF; + /* what in the dark magic? ok just dont touch one can hope */ struct multiboot_info { uint32_t flags; @@ -47,6 +55,68 @@ struct multiboot_info { uint8_t color_info[6]; } __attribute__((packed)); +void draw_char(int x, int y, int c, uint32_t color, uint32_t *framebuffer, uint32_t width) +{ + char *glyph = font8x8_basic[(unsigned char)c]; + + for (int row = 0; row < 8; row++) { + for (int col = 0; col < 8; col++) { + if (glyph[row] & (1 << col)) { + framebuffer[(y + row) * width + (x + col)] = color; + } + } + } +} + +void draw_string(int x, int y, const char *str, uint32_t color, uint32_t *framebuffer, uint32_t width) +{ + while (*str) { + draw_char(x, y, *str, color, framebuffer, width); + x += 8; + str++; + } +} + +void term_init(uint32_t *framebuffer, uint32_t width, uint32_t height) +{ + g_framebuffer = framebuffer; + g_width = width; + g_height = height; + term_col = 0; + term_row = 0; +} + +void term_set_color(uint32_t color) +{ + g_default_color = color; +} + +void term_printf(const char *str) +{ + while (*str) { + if (*str == '\n') { + term_col = 0; + term_row++; + str++; + continue; + } + + if ((term_col * 8) >= g_width) { + term_col = 0; + term_row++; + } + + if ((term_row * 8) >= g_height) { + term_row = 0; // just simple wrap around for now, scroll later + } + + draw_char(term_col * 8, term_row * 8, *str, g_default_color, g_framebuffer, g_width); + + term_col++; + str++; + } +} + void kernel_main(struct multiboot_info *mbi) { // check if framebuffer info is available (bit 12) @@ -54,17 +124,26 @@ void kernel_main(struct multiboot_info *mbi) while(1) __asm__("hlt"); } + // get the framebuffer uint32_t *framebuffer = (uint32_t*)(uintptr_t)mbi->framebuffer_addr; uint32_t width = mbi->framebuffer_width; uint32_t height = mbi->framebuffer_height; - uint32_t pitch = mbi->framebuffer_pitch; - for (uint32_t y = 0; y < height; y++) { - for (uint32_t x = 0; x < width; x++) { - framebuffer[y * (pitch / 4) + x] = 0x00FFFF00; - } - } + // draw text to the framebuffer + term_init(framebuffer, width, height); + term_printf("welcome to "); + term_set_color(0xFCD24D); + term_printf("FrenchToastOS!\n"); + term_set_color(0xFFFFFF); + term_printf("developed by "); + term_set_color(0x967BB6); + term_printf("Arslaan Pathan\n"); + term_set_color(0xFFFFFF); + term_printf("---\n"); + term_printf("https://arslaancodes.com\n"); + // if theres nothing left to do, halt the cpu or else cooked + // our boot.s already does this but better to be safe than sorry while (1) { __asm__ __volatile__ ("hlt"); } |