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, 0x04 /* Read register */);
	42	oldread = inb(0x3CF);
	43	outb(0x3CF, 0x02 /* Font plane */);
	44
	45	smram_aseg_set_state(SMRAM_ASEG_SMMCODE);
	46	memcpy(_font, p2v(0xB8000), sizeof(_font));
	47	smram_restore_state(old_state);
	48
	49	outb(0x3CF, oldread);
	50	}
	51
	52	void text_render(char *buf, int x, int y, int w, int h)
	53	{
	54	unsigned char video = (unsigned char )vga_base();
	55	unsigned int textx = x / 9;
	56	unsigned int texty = y / 14;
	57	unsigned int cx, cy;
	58	unsigned char ch, at, font;
	59	smram_state_t old_state = smram_save_state();
	60	/*
	61	outputf("text_render: (%d,%d),(%d,%d)", x, y, w, h);
	62	*/
	63	smram_aseg_set_state(SMRAM_ASEG_SMMCODE);
	64	for (cy = y; cy < (y + h); cy++)
	65	{
	66	cx = x;
	67	texty = cy / 14;
	68	textx = cx / 9;
	69	ch = video[texty * 160 + textx * 2];
	70	at = video[texty * 160 + textx * 2 + 1];
	71	font = _font[ch * 32 + cy % 14];
	72	for (cx = x; cx < (x + w); cx++)
	73	{
	74	unsigned int pos = cx % 9;
	75	if (pos == 0)
	76	{
	77	textx = cx / 9;
	78	ch = video[texty * 160 + textx * 2];
	79	at = video[texty * 160 + textx * 2 + 1];
	80	font = _font[ch * 32 + cy % 14];
	81	}
	82	/* XXX always BGR888 */
	83	if (pos == 8) /* 9th pixel is cloned */
	84	pos = 7;
	85	if ((font >> (7 - pos)) & 1)
	86	{
	87	*(buf++) = (at & 0x01) ? 0xFF : 0x00;
	88	*(buf++) = (at & 0x02) ? 0xFF : 0x00;
	89	*(buf++) = (at & 0x04) ? 0xFF : 0x00;
	90	} else {
	91	*(buf++) = (at & 0x10) ? 0xFF : 0x00;
	92	*(buf++) = (at & 0x20) ? 0xFF : 0x00;
	93	*(buf++) = (at & 0x40) ? 0xFF : 0x00;
	94	}
	95	*(buf++) = 0;
	96	}
	97	}
	98	smram_restore_state(old_state);
	99	}
	100
	101	uint32_t text_checksum(int x, int y, int w, int h)
	102	{
	103	unsigned char video = (unsigned char )vga_base();
	104	unsigned int textx = x / 9;
	105	unsigned int texty = y / 14;
	106	int cx, cy;
	107	uint32_t cksm = 0;
	108	smram_state_t old_state = smram_save_state();
	109
	110	smram_aseg_set_state(SMRAM_ASEG_SMMCODE);
	111
	112	for (cy = y; cy < (y + h); cy++)
	113	{
	114	cx = x;
	115	texty = cy / 14;
	116	textx = cx / 9;
	117	cksm = crc32(video + texty * 160 + textx * 2, (w / 9) * 2 + 2, cksm); /* Err on the side of 'too many'. */
	118	}
	119
	120	smram_restore_state(old_state);
	121
	122	return cksm;
	123	}