X-Git-Url: http://git.joshuawise.com/netwatch.git/blobdiff_plain/c1cc31ac5cc581f2142c15794ef7c6cfaa3ec6d9..0b67a02c833eca817fa0e4a548dc765532c2485f:/video/text.c

diff --git a/video/text.c b/video/text.c
index a25c8aa..d710cee 100644
--- a/video/text.c
+++ b/video/text.c
@@ -5,37 +5,61 @@
 #include <stdint.h>
 #include <output.h>
 #include <smram.h>
+#include <crc32.h>
+#include <video_defines.h>
 
 static unsigned char _font[256 * 32];
 
+/* XXX reunify this with vga-overlay? */
+#define VRAM_BASE		0xA0000UL
+#define TEXT_CONSOLE_OFFSET	0x18000UL 
+
+#define TEXT_CONSOLE_BASE	(VRAM_BASE + TEXT_CONSOLE_OFFSET)
+
+static unsigned char vga_read(unsigned char idx)
+{
+	outb(CRTC_IDX_REG, idx);
+	return inb(CRTC_DATA_REG);
+}
+
+static char * vga_base()
+{
+	return (char *) (
+		TEXT_CONSOLE_BASE
+		+ (((unsigned int) vga_read(CRTC_START_ADDR_MSB_IDX)) << 9)
+		+ (((unsigned int) vga_read(CRTC_START_ADDR_LSB_IDX)) << 1)
+	);
+}
+
 /* Must be called from a firstrun context, where we don't care about saving
  * 0x3CE state. */
 void text_init()
 {
 	unsigned char oldread;
+
 	smram_state_t old_state = smram_save_state();
-	outb(0x3CE, 0x05 /* Mode register */);
-	outb(0x3CF, inb(0x3CF) & ~(0x10 /* Odd/even */));
 	outb(0x3CE, 0x04 /* Read register */);
 	oldread = inb(0x3CF);
 	outb(0x3CF, 0x02 /* Font plane */);
+
 	smram_aseg_set_state(SMRAM_ASEG_SMMCODE);
 	memcpy(_font, p2v(0xB8000), sizeof(_font));
 	smram_restore_state(old_state);
+
 	outb(0x3CF, oldread);
 }
 
 void text_render(char *buf, int x, int y, int w, int h)
 {
-	unsigned char *video = (unsigned char *)0xB8000;
+	unsigned char *video = (unsigned char *)vga_base();
 	unsigned int textx = x / 9;
 	unsigned int texty = y / 14;
 	unsigned int cx, cy;
 	unsigned char ch, at, font;
 	smram_state_t old_state = smram_save_state();
-	
-	outputf("text_render: (%d,%d),(%d,%d)", buf, x, y, w, h);
-	
+/*
+	outputf("text_render: (%d,%d),(%d,%d)", x, y, w, h);
+*/	
 	smram_aseg_set_state(SMRAM_ASEG_SMMCODE);
 	for (cy = y; cy < (y + h); cy++)
 	{
@@ -76,11 +100,10 @@ void text_render(char *buf, int x, int y, int w, int h)
 
 uint32_t text_checksum(int x, int y, int w, int h)
 {
-	unsigned char *video = (unsigned char *)0xB8000;
+	unsigned char *video = (unsigned char *)vga_base();
 	unsigned int textx = x / 9;
 	unsigned int texty = y / 14;
 	int cx, cy;
-	unsigned char ch, at;
 	uint32_t cksm = 0;
 	smram_state_t old_state = smram_save_state();
 	
@@ -91,7 +114,7 @@ uint32_t text_checksum(int x, int y, int w, int h)
 		cx = x;
 		texty = cy / 14;
 		textx = cx / 9;
-		cksm ^= crc32(video + texty * 160 + textx * 2, (w / 9 + 1) * 2);	/* Err on the side of 'too many'. */
+		cksm = crc32(video + texty * 160 + textx * 2, (w / 9) * 2 + 2, cksm);	/* Err on the side of 'too many'. */
 	}
 	
 	smram_restore_state(old_state);