console vga stuff

kernel/lib/font.c

@@ -0,0 +1,44 @@
+#include "vfs.h"
+#include <lib/font.h>
+#include <lib/memory.h>
+
+#include <stddef.h>
+
+psf_font_t* load_font(const char* path) {
+    int fd = vfs_open(path, 0);
+    if (fd == -1) {
+        return NULL;
+    }
+
+    psf_hdr_t* header = kalloc(sizeof(psf_hdr_t));
+    int rd = vfs_read(fd, header, sizeof(psf_hdr_t));
+    if (rd <= 0) {
+        kfree(header);
+        return NULL;
+    }
+
+    uint32_t num_glyphs = (header->mode & (1 << 0)) ? 512 : 256;
+    uint32_t glyph_sz = header->charsz;
+    uint32_t glyph_buf_sz = num_glyphs * glyph_sz;
+
+    void* glyphs = kalloc(glyph_buf_sz);
+
+    rd = 0;
+    rd = vfs_read(fd, glyphs, glyph_buf_sz);
+    if (rd <= 0) {
+        kfree(header);
+        kfree(glyphs);
+        return NULL;
+    }
+
+    psf_font_t* font = kalloc(sizeof(psf_font_t));
+    font->hdr = header;
+    font->glyphs = glyphs;
+    return font;
+}
+
+void free_font(psf_font_t* font) {
+    kfree(font->glyphs);
+    kfree(font->hdr);
+    kfree(font);
+}