+/* 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;
+}