Joshua Wise's Git repositories - netwatch.git/blame_incremental

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Commit	Line	Data
	1	#include <io.h>
	2	#include <text.h>
	3	#include <paging.h>
	4	#include <minilib.h>
	5	#include <stdint.h>
	6	#include <output.h>
	7	#include <smram.h>
	8	#include <crc32.h>
	9	#include <video_defines.h>
	10
	11	static unsigned char _font[256 * 32];
	12
	13	/* XXX reunify this with vga-overlay? */
	14	#define VRAM_BASE 0xA0000UL
	15	#define TEXT_CONSOLE_OFFSET 0x18000UL
	16
	17	#define TEXT_CONSOLE_BASE (VRAM_BASE + TEXT_CONSOLE_OFFSET)
	18
	19	static unsigned char vga_read(unsigned char idx)
	20	{
	21	outb(CRTC_IDX_REG, idx);
	22	return inb(CRTC_DATA_REG);
	23	}
	24
	25	static char * vga_base()
	26	{
	27	return (char *) (
	28	TEXT_CONSOLE_BASE
	29	+ (((unsigned int) vga_read(CRTC_START_ADDR_MSB_IDX)) << 9)
	30	+ (((unsigned int) vga_read(CRTC_START_ADDR_LSB_IDX)) << 1)
	31	);
	32	}
	33
	34	/* Must be called from a firstrun context, where we don't care about saving
	35	* 0x3CE state. */
	36	void text_init()
	37	{
	38	unsigned char oldread;
	39
	40	smram_state_t old_state = smram_save_state();
	41	outb(0x3CE, 0x06 /* Miscellaneous */);
	42	outb(0x3CF, 0x0C);
	43	outb(0x3C4, 0x04 /* Seq memory mode */);
	44	outb(0x3C5, inb(0x3C5) \| 0x04);
	45	outb(0x3CE, 0x05 /* Mode */);
	46	outb(0x3CF, inb(0x3CF) & ~0x10);
	47	outb(0x3CE, 0x04 /* Read register */);
	48	oldread = inb(0x3CF);
	49	outb(0x3CF, 0x02 /* Font plane */);
	50
	51	smram_aseg_set_state(SMRAM_ASEG_SMMCODE);
	52	memcpy(_font, p2v(0xB8000), sizeof(_font));
	53	smram_restore_state(old_state);
	54
	55	outb(0x3CF, oldread);
	56	outb(0x3CE, 0x06 /* Miscellaneous */);
	57	outb(0x3CF, 0x0E);
	58	outb(0x3CE, 0x05 /* Mode */);
	59	outb(0x3CF, inb(0x3CF) \| 0x10);
	60	outb(0x3C4, 0x04 /* Seq memory mode */);
	61	outb(0x3C5, inb(0x3C5) & ~0x04);
	62	}
	63
	64	void text_render(char *buf, int x, int y, int w, int h)
	65	{
	66	unsigned char video = (unsigned char )vga_base();
	67	unsigned int textx = x / 9;
	68	unsigned int texty = y / 16;
	69	unsigned int cx, cy;
	70	unsigned char ch, at, font;
	71	smram_state_t old_state = smram_save_state();
	72
	73	outputf("text_render: (%d,%d),(%d,%d)", x, y, w, h);
	74
	75	smram_aseg_set_state(SMRAM_ASEG_SMMCODE);
	76	for (cy = y; cy < (y + h); cy++)
	77	{
	78	cx = x;
	79	texty = cy / 16;
	80	textx = cx / 9;
	81	ch = video[texty * 160 + textx * 2];
	82	at = video[texty * 160 + textx * 2 + 1];
	83	font = _font[ch * 32 + cy % 16];
	84	for (cx = x; cx < (x + w); cx++)
	85	{
	86	unsigned int pos = cx % 8;
	87	if (pos == 0)
	88	{
	89	textx = cx / 8;
	90	ch = video[texty * 160 + textx * 2];
	91	at = video[texty * 160 + textx * 2 + 1];
	92	font = _font[ch * 32 + cy % 16];
	93	}
	94	/* XXX always BGR888 */
	95	if (pos == 8) /* 9th pixel is cloned */
	96	pos = 7;
	97	if ((font >> (7 - pos)) & 1)
	98	{
	99	*(buf++) = (at & 0x01) ? 0xFF : 0x00;
	100	*(buf++) = (at & 0x02) ? 0xFF : 0x00;
	101	*(buf++) = (at & 0x04) ? 0xFF : 0x00;
	102	} else {
	103	*(buf++) = (at & 0x10) ? 0xFF : 0x00;
	104	*(buf++) = (at & 0x20) ? 0xFF : 0x00;
	105	*(buf++) = (at & 0x40) ? 0xFF : 0x00;
	106	}
	107	*(buf++) = 0;
	108	}
	109	}
	110	smram_restore_state(old_state);
	111	}
	112
	113	uint32_t text_checksum(int x, int y, int w, int h)
	114	{
	115	unsigned char video = (unsigned char )vga_base();
	116	unsigned int textx = x / 8;
	117	unsigned int texty = y / 16;
	118	int cx, cy;
	119	uint32_t cksm = 0;
	120	smram_state_t old_state = smram_save_state();
	121
	122	smram_aseg_set_state(SMRAM_ASEG_SMMCODE);
	123
	124	for (cy = y; cy < (y + h); cy++)
	125	{
	126	cx = x;
	127	texty = cy / 16;
	128	textx = cx / 8;
	129	cksm = crc32(video + texty * 160 + textx * 2, (w / 8) * 2 + 2, cksm); /* Err on the side of 'too many'. */
	130	}
	131
	132	smram_restore_state(old_state);
	133
	134	return cksm;
	135	}