More work on the VESA graphics console

4 files changed, 336 insertions, 0 deletions

diff --git a/com32/lib/sys/vesa/alphatbl.pl b/com32/lib/sys/vesa/alphatbl.pl
new file mode 100755
index 00000000..e49ff3e6
--- /dev/null
+++ b/com32/lib/sys/vesa/alphatbl.pl
@@ -0,0 +1,48 @@
+#!/usr/bin/perl
+#
+# Compute the alpha-blending table for 256 possible (R, G, B) value
+# compared with the 4-bit intensity value from the character attribute
+#
+
+#
+# Configurable parameters...
+#
+@text_intensity = (0.0, 0.3333, 0.6667, 1.0);
+$text_alpha = 0.5;
+$input_gamma  = 1.7;
+$text_gamma   = 1.7;
+$output_gamma = 1.7;
+
+sub ungamma($$) {
+    my($v, $gamma) = @_;
+
+    return $v**$gamma;
+}
+
+sub gamma($$) {
+    my($v, $gamma) = @_;
+    return $v**(1/$gamma);
+}
+
+print "unsigned char __vesacon_alpha_tbl[256][4] = {\n";
+
+for ($i = 0; $i <= 255; $i++) {
+    $ival = ungamma($i/255, $input_gamma);
+
+    $intro = "\t{";
+
+    for ($j = 0; $j < 4; $j++) {
+	$v = ($ival*(1-$text_alpha)) +
+	    ungamma($text_intensity[$j], $text_gamma)*$text_alpha;
+
+	$d = int(gamma($v,$output_gamma)*255+0.5);
+
+	$d = 0   if ($d < 0);
+	$d = 255 if ($d > 255);
+
+	printf "%s%3d", $intro, $d;
+	$intro = ', ';
+    }
+    print "},\n";
+}
+print "};\n";
diff --git a/com32/lib/sys/vesa/initvesa.c b/com32/lib/sys/vesa/initvesa.c
new file mode 100644
index 00000000..43b34985
--- /dev/null
+++ b/com32/lib/sys/vesa/initvesa.c
@@ -0,0 +1,149 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 1999-2006 H. Peter Anvin - All Rights Reserved
+ *
+ *   Permission is hereby granted, free of charge, to any person
+ *   obtaining a copy of this software and associated documentation
+ *   files (the "Software"), to deal in the Software without
+ *   restriction, including without limitation the rights to use,
+ *   copy, modify, merge, publish, distribute, sublicense, and/or
+ *   sell copies of the Software, and to permit persons to whom
+ *   the Software is furnished to do so, subject to the following
+ *   conditions:
+ *
+ *   The above copyright notice and this permission notice shall
+ *   be included in all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *   OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * initvesa.c
+ *
+ * Query the VESA BIOS and select a 640x480x32 mode with local mapping
+ * support, if one exists.
+ */
+
+#include <inttypes.h>
+#include <com32.h>
+#include <string.h>
+#include "vesa.h"
+#include "video.h"
+
+struct vesa_general_info __vesa_general_info;
+struct vesa_mode_info    __vesa_mode_info;
+
+uint8_t __vesacon_graphics_font[FONT_MAX_CHARS][FONT_MAX_HEIGHT];
+uint32_t __vesacon_background[VIDEO_Y_SIZE][VIDEO_X_SIZE];
+uint32_t __vesacon_shadowfb[VIDEO_Y_SIZE][VIDEO_X_SIZE];
+
+static void unpack_font(uint8_t *dst, uint8_t *src, int height)
+{
+  int i;
+
+  for (i = 0; i < FONT_MAX_CHARS; i++) {
+    memcpy(dst, src, height);
+    memset(dst+height, 0, 32-height);
+
+    dst += 32;
+    src += height;
+  }
+}
+
+static int vesacon_set_mode(void)
+{
+  com32sys_t rm;
+  uint8_t *rom_font;
+  uint16_t mode, *mode_ptr;
+  struct vesa_general_info *gi;
+  struct vesa_mode_info *mi;
+
+  /* Allocate space in the bounce buffer for these structures */
+  gi = &((struct vesa_info *)__com32.cs_bounce)->gi;
+  mi = &((struct vesa_info *)__com32.cs_bounce)->mi;
+
+  memset(&rm, 0, sizeof rm);
+
+  gi->signature = VBE2_MAGIC;	/* Get VBE2 extended data */
+  rm.eax.w[0] = 0x4F00;		/* Get SVGA general information */
+  rm.edi.w[0] = OFFS(gi);
+  rm.es      = SEG(gi);
+  __intcall(0x10, &rm, &rm);
+
+  if ( rm.eax.w[0] != 0x004F )
+    return 1;			/* Function call failed */
+  if ( gi->signature != VESA_MAGIC )
+    return 2;			/* No magic */
+  if ( gi->version < 0x0200 ) {
+    return 3;			/* VESA 2.0 not supported */
+  }
+
+  /* Search for a 640x480 32-bit linear frame buffer mode */
+  mode_ptr = CVT_PTR(gi->video_mode_ptr);
+
+  for(;;) {
+    if ((mode = *mode_ptr++) == 0xFFFF)
+      return 4;			/* No mode found */
+
+    rm.eax.w[0] = 0x4F01;	/* Get SVGA mode information */
+    rm.ecx.w[0] = mode;
+    rm.edi.w[0] = OFFS(mi);
+    rm.es  = SEG(mi);
+    __intcall(0x10, &rm, &rm);
+
+    /* Must be a supported mode */
+    if ( rm.eax.w[0] != 0x004f )
+      continue;
+    /* Must be an LFB color graphics mode supported by the hardware */
+    if ( (mi->mode_attr & 0x0099) != 0x0099 )
+      continue;
+    /* Must be 640x480, 32 bpp */
+    if ( mi->h_res != VIDEO_X_SIZE || mi->v_res != VIDEO_Y_SIZE ||
+	 mi->bpp != 32 )
+      continue;
+    /* Must either be a packed-pixel mode or a direct color mode
+       (depending on VESA version ) */
+    if ( mi->memory_layout != 4 && /* Packed pixel */
+	 (mi->memory_layout != 6 || mi->rpos != 24 ||
+	  mi->gpos != 16 || mi->bpos != 0) )
+      continue;
+
+    /* Hey, looks like we found something we can live with */
+    break;
+  }
+
+  /* Download the BIOS-provided font */
+  rm.eax.w[0] = 0x1130;		/* Get Font Information */
+  rm.ebx.w[0] = 0x0600;		/* Get 8x16 ROM font */
+  __intcall(0x10, &rm, &rm);
+  rom_font = MK_PTR(rm.es, rm.ebp.w[0]);
+  unpack_font(graphics_font, rom_font, 16);
+
+  /* Now set video mode */
+  rm.eax.w[0] = 0x4F02;		/* Set SVGA video mode */
+  rm.ebx.w[0] = mode | 0xC000;	/* Don't clear video RAM, use linear fb */
+  __intcall(0x10, &rm, &rm);
+  if ( rm.eax.w[0] != 0x004F ) {
+    rm.eax.w[0] = 0x0003;	/* Set regular text mode */
+    __intcall(0x10, &rm, NULL);
+    return 9;			/* Failed to set mode */
+  }
+
+  /* Copy established state out of the bounce buffer */
+  memcpy(&__vesa_info, __com32.cs_bounce, sizeof __vesa_info);
+
+  return 0;
+}
+
+int __vesacon_init(void)
+{
+  return vesacon_set_mode();
+}
diff --git a/com32/lib/sys/vesa/vesa.h b/com32/lib/sys/vesa/vesa.h
new file mode 100644
index 00000000..55e64b4d
--- /dev/null
+++ b/com32/lib/sys/vesa/vesa.h
@@ -0,0 +1,100 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 1999-2006 H. Peter Anvin - All Rights Reserved
+ *
+ *   Permission is hereby granted, free of charge, to any person
+ *   obtaining a copy of this software and associated documentation
+ *   files (the "Software"), to deal in the Software without
+ *   restriction, including without limitation the rights to use,
+ *   copy, modify, merge, publish, distribute, sublicense, and/or
+ *   sell copies of the Software, and to permit persons to whom
+ *   the Software is furnished to do so, subject to the following
+ *   conditions:
+ *
+ *   The above copyright notice and this permission notice shall
+ *   be included in all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *   OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+#ifndef LIB_SYS_VESA_H
+#define LIB_SYS_VESA_H
+
+#include <inttypes.h>
+#include <com32.h>
+
+/* VESA General Information table */
+struct vesa_general_info {
+  uint32_t  signature;		/* Magic number = "VESA" */
+  uint16_t  version;
+  far_ptr_t vendor_string;
+  uint8_t   capabilities[4];
+  far_ptr_t video_mode_ptr;
+  uint32_t  total_memory;
+
+  uint16_t  oem_software_rev;
+  far_ptr_t oem_vendor_name_ptr;
+  far_ptr_t oem_product_name_ptr;
+  far_ptr_t oem_product_rev_ptr;
+
+  uint8_t   reserved[222];
+  uint8_t   oem_data[256];
+} __attribute__((packed));
+
+#define VESA_MAGIC ('V' + ('E' << 8) + ('S' << 16) + ('A' << 24))
+#define VBE2_MAGIC ('V' + ('B' << 8) + ('E' << 16) + ('2' << 24))
+
+struct vesa_mode_info {
+  uint16_t  mode_attr;
+  uint8_t   win_attr[2];
+  uint16_t  win_grain;
+  uint16_t  win_size;
+  uint16_t  win_seg[2];
+  far_ptr_t win_scheme;
+  uint16_t  logical_scan;
+
+  uint16_t  h_res;
+  uint16_t  v_res;
+  uint8_t   char_width;
+  uint8_t   char_height;
+  uint8_t   memory_planes;
+  uint8_t   bpp;
+  uint8_t   banks;
+  uint8_t   memory_layout;
+  uint8_t   bank_size;
+  uint8_t   image_planes;
+  uint8_t   page_function;
+
+  uint8_t   rmask;
+  uint8_t   rpos;
+  uint8_t   gmask;
+  uint8_t   gpos;
+  uint8_t   bmask;
+  uint8_t   bpos;
+  uint8_t   resv_mask;
+  uint8_t   resv_pos;
+  uint8_t   dcm_info;
+
+  uint8_t  *lfb_ptr;		/* Linear frame buffer address */
+  uint8_t  *offscreen_ptr;	/* Offscreen memory address */
+  uint16_t  offscreen_size;
+
+  uint8_t   reserved[206];
+} __attribute__((packed));
+
+struct vesa_info {
+  struct vesa_general_info gi;
+  struct vesa_mode_info    mi;
+};
+
+extern struct vesa_info __vesa_info;
+
+#endif /* LIB_SYS_VESA_H */
diff --git a/com32/lib/sys/vesa/video.h b/com32/lib/sys/vesa/video.h
new file mode 100644
index 00000000..acbbc109
--- /dev/null
+++ b/com32/lib/sys/vesa/video.h
@@ -0,0 +1,39 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2006 H. Peter Anvin - All Rights Reserved
+ *
+ *   Permission is hereby granted, free of charge, to any person
+ *   obtaining a copy of this software and associated documentation
+ *   files (the "Software"), to deal in the Software without
+ *   restriction, including without limitation the rights to use,
+ *   copy, modify, merge, publish, distribute, sublicense, and/or
+ *   sell copies of the Software, and to permit persons to whom
+ *   the Software is furnished to do so, subject to the following
+ *   conditions:
+ *
+ *   The above copyright notice and this permission notice shall
+ *   be included in all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *   OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+#ifndef LIB_SYS_VESA_VIDEO_H
+#define LIB_SYS_VESA_VIDEO_H
+
+#define FONT_MAX_CHARS	256
+#define FONT_MAX_HEIGHT	 32
+
+#define VIDEO_X_SIZE	640
+#define VIDEO_Y_SIZE	480
+
+extern uint8_t graphics_font[FONT_MAX_CHARS][FONT_MAX_HEIGHT];
+
+#endif /* LIB_SYS_VESA_VIDEO_H */