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Add basic character output for VGA graphics mode console (#649)
* Test output of colors for VGA graphics modes in examples/vga.c * [metal] Character output in VGA graphics modes is mostly working * [metal] Mention magic key to switch video mode, at bootup
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tkchia
GitHub
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8 changed files with 2059 additions and 324 deletions
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@ -52,185 +52,6 @@ ssize_t sys_writev_vga(struct Fd *fd, const struct iovec *iov, int iovlen) {
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return wrote;
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}
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static void _vga_init_test(void *vid_buf, unsigned char vid_type,
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size_t stride) {
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switch (vid_type) {
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case PC_VIDEO_TEXT:
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break;
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case PC_VIDEO_BGR565:
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{
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char *row_buf = (char *)vid_buf + stride * 100;
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uint16_t *row_pix = (uint16_t *)row_buf;
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unsigned i;
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row_pix[0] = 0x0000;
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row_pix[1] = 0x0000;
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row_pix[2] = 0x07fc;
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row_pix[3] = 0x07fc;
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row_pix[4] = 0x07fc;
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row_pix[5] = 0x0000;
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row_pix[6] = 0x0000;
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row_pix[7] = 0x0000;
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row_buf += stride;
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row_pix = (uint16_t *)row_buf;
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row_pix[0] = 0x0000;
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row_pix[1] = 0x07fc;
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row_pix[2] = 0x07fc;
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row_pix[3] = 0x07fc;
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row_pix[4] = 0x07fc;
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row_pix[5] = 0x07fc;
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row_pix[6] = 0x0000;
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row_pix[7] = 0x0000;
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row_buf += stride;
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row_pix = (uint16_t *)row_buf;
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row_pix[0] = 0x07fc;
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row_pix[1] = 0x07fc;
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row_pix[2] = 0x0000;
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row_pix[3] = 0x0000;
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row_pix[4] = 0x0000;
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row_pix[5] = 0x07fc;
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row_pix[6] = 0x07fc;
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row_pix[7] = 0x0000;
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row_buf += stride;
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row_pix = (uint16_t *)row_buf;
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row_pix[0] = 0x07fc;
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row_pix[1] = 0x07fc;
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row_pix[2] = 0x07fc;
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row_pix[3] = 0x07fc;
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row_pix[4] = 0x07fc;
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row_pix[5] = 0x07fc;
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row_pix[6] = 0x07fc;
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row_pix[7] = 0x0000;
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for (i = 0; i < 4; ++i) {
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row_buf += stride;
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row_pix = (uint16_t *)row_buf;
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row_pix[0] = 0xf81f;
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row_pix[1] = 0xf81f;
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row_pix[2] = 0x0000;
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row_pix[3] = 0x0000;
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row_pix[4] = 0x0000;
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row_pix[5] = 0xf81f;
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row_pix[6] = 0xf81f;
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row_pix[7] = 0x0000;
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}
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}
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break;
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case PC_VIDEO_BGR555:
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{
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char *row_buf = (char *)vid_buf + stride * 100;
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uint16_t *row_pix = (uint16_t *)row_buf;
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unsigned i;
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row_pix[0] = 0x8000;
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row_pix[1] = 0x8000;
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row_pix[2] = 0x83fc;
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row_pix[3] = 0x83fc;
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row_pix[4] = 0x83fc;
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row_pix[5] = 0x8000;
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row_pix[6] = 0x8000;
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row_pix[7] = 0x8000;
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row_buf += stride;
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row_pix = (uint16_t *)row_buf;
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row_pix[0] = 0x8000;
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row_pix[1] = 0x83fc;
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row_pix[2] = 0x83fc;
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row_pix[3] = 0x83fc;
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row_pix[4] = 0x83fc;
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row_pix[5] = 0x83fc;
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row_pix[6] = 0x8000;
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row_pix[7] = 0x8000;
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row_buf += stride;
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row_pix = (uint16_t *)row_buf;
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row_pix[0] = 0x83fc;
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row_pix[1] = 0x83fc;
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row_pix[2] = 0x8000;
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row_pix[3] = 0x8000;
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row_pix[4] = 0x8000;
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row_pix[5] = 0x83fc;
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row_pix[6] = 0x83fc;
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row_pix[7] = 0x8000;
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row_buf += stride;
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row_pix = (uint16_t *)row_buf;
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row_pix[0] = 0x83fc;
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row_pix[1] = 0x83fc;
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row_pix[2] = 0x83fc;
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row_pix[3] = 0x83fc;
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row_pix[4] = 0x83fc;
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row_pix[5] = 0x83fc;
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row_pix[6] = 0x83fc;
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row_pix[7] = 0x8000;
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for (i = 0; i < 4; ++i) {
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row_buf += stride;
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row_pix = (uint16_t *)row_buf;
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row_pix[0] = 0xfc1f;
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row_pix[1] = 0xfc1f;
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row_pix[2] = 0x8000;
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row_pix[3] = 0x8000;
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row_pix[4] = 0x8000;
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row_pix[5] = 0xfc1f;
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row_pix[6] = 0xfc1f;
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row_pix[7] = 0x8000;
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}
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}
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break;
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default:
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{
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char *row_buf = (char *)vid_buf + stride * 100;
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uint32_t *row_pix = (uint32_t *)row_buf;
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unsigned i;
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row_pix[0] = 0xff000000;
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row_pix[1] = 0xff000000;
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row_pix[2] = 0xff00ffe0;
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row_pix[3] = 0xff00ffe0;
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row_pix[4] = 0xff00ffe0;
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row_pix[5] = 0xff000000;
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row_pix[6] = 0xff000000;
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row_pix[7] = 0xff000000;
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row_buf += stride;
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row_pix = (uint32_t *)row_buf;
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row_pix[0] = 0xff000000;
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row_pix[1] = 0xff00ffe0;
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row_pix[2] = 0xff00ffe0;
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row_pix[3] = 0xff00ffe0;
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row_pix[4] = 0xff00ffe0;
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row_pix[5] = 0xff00ffe0;
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row_pix[6] = 0xff000000;
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row_pix[7] = 0xff000000;
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row_buf += stride;
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row_pix = (uint32_t *)row_buf;
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row_pix[0] = 0xff00ffe0;
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row_pix[1] = 0xff00ffe0;
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row_pix[2] = 0xff000000;
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row_pix[3] = 0xff000000;
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row_pix[4] = 0xff000000;
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row_pix[5] = 0xff00ffe0;
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row_pix[6] = 0xff00ffe0;
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row_pix[7] = 0xff000000;
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row_buf += stride;
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row_pix = (uint32_t *)row_buf;
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row_pix[0] = 0xff00ffe0;
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row_pix[1] = 0xff00ffe0;
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row_pix[2] = 0xff00ffe0;
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row_pix[3] = 0xff00ffe0;
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row_pix[4] = 0xff00ffe0;
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row_pix[5] = 0xff00ffe0;
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row_pix[6] = 0xff00ffe0;
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row_pix[7] = 0xff000000;
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for (i = 0; i < 4; ++i) {
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row_buf += stride;
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row_pix = (uint32_t *)row_buf;
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row_pix[0] = 0xffff00ff;
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row_pix[1] = 0xffff00ff;
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row_pix[2] = 0xff000000;
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row_pix[3] = 0xff000000;
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row_pix[4] = 0xff000000;
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row_pix[5] = 0xffff00ff;
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row_pix[6] = 0xffff00ff;
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row_pix[7] = 0xff000000;
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}
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}
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break;
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}
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}
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__attribute__((__constructor__)) static textstartup void _vga_init(void) {
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if (IsMetal()) {
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struct mman *mm = (struct mman *)(BANE + 0x0500);
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@ -249,21 +70,22 @@ __attribute__((__constructor__)) static textstartup void _vga_init(void) {
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unsigned char col, row;
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} bios_curs_pos_t;
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bios_curs_pos_t pos = *(bios_curs_pos_t *)(BANE + 0x0450ull);
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uint8_t chr_ht = *(uint8_t *)(BANE + 0x0485ull),
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chr_ht_hi = *(uint8_t *)(BANE + 0x0486ull);
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if (chr_ht_hi != 0 || chr_ht > 32)
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chr_ht = 32;
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uint8_t chr_ht, chr_ht_hi, chr_wid;
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if (vid_type == PC_VIDEO_TEXT) {
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chr_ht = *(uint8_t *)(BANE + 0x0485ull),
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chr_ht_hi = *(uint8_t *)(BANE + 0x0486ull);
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if (chr_ht_hi != 0 || chr_ht > 32 || chr_ht < 2)
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chr_ht = VGA_ASSUME_CHAR_HEIGHT_PX;
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} else
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chr_ht = VGA_ASSUME_CHAR_HEIGHT_PX;
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chr_wid = VGA_ASSUME_CHAR_WIDTH_PX;
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/* Make sure the video buffer is mapped into virtual memory. */
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__invert_memory_area(mm, __get_pml4t(), vid_buf_phy, vid_buf_sz, PAGE_RW);
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#if 1
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/* Test video frame buffer output. */
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_vga_init_test(vid_buf, vid_type, stride);
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#endif
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/*
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* Initialize our tty structure from the current screen geometry,
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* screen contents, cursor position, & character height.
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* screen contents, cursor position, & character dimensions.
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*/
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_StartTty(&_vga_tty, height, width, pos.row, pos.col, chr_ht,
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vid_buf, NULL);
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_StartTty(&_vga_tty, vid_type, height, width, stride, pos.row, pos.col,
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chr_ht, chr_wid, vid_buf, false);
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}
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}
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