Be more correct in grabbing fonts from VRAM.

[netwatch.git] / video / text.c

diff --git a/video/text.c b/video/text.c
index 25fe245dec4a551cb9d144cac9eb09f9b751afb9..f6c9f529855cdcd4482d817b5e2ae149306909c9 100644 (file)
--- a/video/text.c
+++ b/video/text.c
@@ -6,46 +6,81 @@
 #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, 0x06 /* Miscellaneous */);
+       outb(0x3CF, 0x0C);
+       outb(0x3C4, 0x04 /* Seq memory mode */);
+       outb(0x3C5, inb(0x3C5) | 0x04);
+       outb(0x3CE, 0x05 /* Mode */);
+       outb(0x3CF, inb(0x3CF) & ~0x10);
        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);
+       outb(0x3CE, 0x06 /* Miscellaneous */);
+       outb(0x3CF, 0x0E);
+       outb(0x3CE, 0x05 /* Mode */);
+       outb(0x3CF, inb(0x3CF) | 0x10);
+       outb(0x3C4, 0x04 /* Seq memory mode */);
+       outb(0x3C5, inb(0x3C5) & ~0x04);
 }
 
 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 texty = y / 16;
        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++)
        {
                cx = x;
-               texty = cy / 14;
+               texty = cy / 16;
                textx = cx / 9;
                ch = video[texty * 160 + textx * 2];
                at = video[texty * 160 + textx * 2 + 1];
-               font = _font[ch * 32 + cy % 14];
+               font = _font[ch * 32 + cy % 16];
                for (cx = x; cx < (x + w); cx++)
                {
                        unsigned int pos = cx % 9;
@@ -54,7 +89,7 @@ void text_render(char *buf, int x, int y, int w, int h)
                                textx = cx / 9;
                                ch = video[texty * 160 + textx * 2];
                                at = video[texty * 160 + textx * 2 + 1];
-                               font = _font[ch * 32 + cy % 14];
+                               font = _font[ch * 32 + cy % 16];
                        }
                        /* XXX always BGR888 */
                        if (pos == 8)   /* 9th pixel is cloned */
@@ -77,9 +112,9 @@ 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;
+       unsigned int texty = y / 16;
        int cx, cy;
        uint32_t cksm = 0;
        smram_state_t old_state = smram_save_state();
@@ -89,9 +124,9 @@ uint32_t text_checksum(int x, int y, int w, int h)
        for (cy = y; cy < (y + h); cy++)
        {
                cx = x;
-               texty = cy / 14;
+               texty = cy / 16;
                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);