More churn moving files around.

[netwatch.git] / hardware / video / text.c

diff --git a/hardware/video/text.c b/hardware/video/text.c
new file mode 100644 (file)
index 0000000..4f26b8e
--- /dev/null
+++ b/hardware/video/text.c
@@ -0,0 +1,145 @@
+/* text.c
+ * Text console checksum and rendering functions
+ * NetWatch system management mode administration console
+ *
+ * Copyright (c) 2008 Jacob Potter and Joshua Wise.  All rights reserved.
+ * This program is free software; you can redistribute and/or modify it under
+ * the terms found in the file LICENSE in the root of this source tree.
+ *
+ */
+
+#include <io.h>
+#include <text.h>
+#include <paging.h>
+#include <minilib.h>
+#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, 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 *)vga_base();
+       unsigned int textx = x / 9;
+       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)", x, y, w, h);
+*/     
+       smram_aseg_set_state(SMRAM_ASEG_SMMCODE);
+       for (cy = y; cy < (y + h); cy++)
+       {
+               cx = x;
+               texty = cy / 16;
+               textx = cx / 9;
+               ch = video[texty * 160 + textx * 2];
+               at = video[texty * 160 + textx * 2 + 1];
+               font = _font[ch * 32 + cy % 16];
+               for (cx = x; cx < (x + w); cx++)
+               {
+                       unsigned int pos = cx % 8;
+                       if (pos == 0)
+                       {
+                               textx = cx / 8;
+                               ch = video[texty * 160 + textx * 2];
+                               at = video[texty * 160 + textx * 2 + 1];
+                               font = _font[ch * 32 + cy % 16];
+                       }
+                       /* XXX always BGR888 */
+                       if (pos == 8)   /* 9th pixel is cloned */
+                               pos = 7;
+                       if ((font >> (7 - pos)) & 1)
+                       {
+                               *(buf++) = (at & 0x01) ? 0xFF : 0x00;
+                               *(buf++) = (at & 0x02) ? 0xFF : 0x00;
+                               *(buf++) = (at & 0x04) ? 0xFF : 0x00;
+                       } else {
+                               *(buf++) = (at & 0x10) ? 0xFF : 0x00;
+                               *(buf++) = (at & 0x20) ? 0xFF : 0x00;
+                               *(buf++) = (at & 0x40) ? 0xFF : 0x00;
+                       }
+                       *(buf++) = 0;
+               }
+       }
+       smram_restore_state(old_state);
+}
+
+uint32_t text_checksum(int x, int y, int w, int h)
+{
+       unsigned char *video = (unsigned char *)vga_base();
+       unsigned int textx = x / 8;
+       unsigned int texty = y / 16;
+       int cx, cy;
+       uint32_t cksm = 0;
+       smram_state_t old_state = smram_save_state();
+       
+       smram_aseg_set_state(SMRAM_ASEG_SMMCODE);
+       
+       for (cy = y; cy < (y + h); cy++)
+       {
+               cx = x;
+               texty = cy / 16;
+               textx = cx / 8;
+               cksm = crc32(video + texty * 160 + textx * 2, (w / 8) * 2 + 2, cksm);   /* Err on the side of 'too many'. */
+       }
+       
+       smram_restore_state(old_state);
+       
+       return cksm;
+}