61 lines
1.0 KiB
C
61 lines
1.0 KiB
C
#include <kern/cdef.h>
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#include <arch/mem.h>
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#include <kern/libkern.h>
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#define FB_PADDR (0xb8000)
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#define FB_ROW (25)
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#define FB_COL (80)
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#define BYTE_PER_CHAR (2)
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#define FB_SZ (FB_ROW * FB_COL * BYTE_PER_CHAR)
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#define DEFAULT_COLOR (0x07)
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static char *base;
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static uint text_pos;
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static void
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_fb_scroll()
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{
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memmove(base, base + FB_COL * BYTE_PER_CHAR, FB_SZ - (FB_COL * BYTE_PER_CHAR));
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text_pos = FB_SZ - (FB_COL * BYTE_PER_CHAR);
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}
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static void
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_print_newline(void)
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{
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text_pos += FB_COL * BYTE_PER_CHAR - text_pos % (FB_COL * BYTE_PER_CHAR);
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if (text_pos >= FB_SZ) {
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_fb_scroll();
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}
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}
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void
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arch_print_init(void)
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{
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// 0 here since it doesn't matter direct mapped
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base = arch_pmap_map(FB_PADDR, FB_SZ);
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text_pos = 0;
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}
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void
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arch_cls()
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{
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memset(base, 0, FB_SZ);
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}
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void
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arch_putc(const char c)
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{
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if (c == '\n') {
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_print_newline();
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return;
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}
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if (text_pos >= FB_SZ) {
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_fb_scroll();
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}
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base[text_pos++] = c;
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base[text_pos++] = DEFAULT_COLOR;
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}
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