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| author | Jaroslav Hensl <emulator@emulace.cz> | 2023-04-10 14:53:37 +0200 |
|---|---|---|
| committer | Jaroslav Hensl <emulator@emulace.cz> | 2023-04-10 14:53:37 +0200 |
| commit | 503e91046f60a86823629d43e64e2d0fcc006549 (patch) | |
| tree | 7f4815da1ae1a94ede4d35aeb32b7ec2b32427e2 /boxv.c | |
| download | vmdisp9x-503e91046f60a86823629d43e64e2d0fcc006549.tar.gz | |
public release
Diffstat (limited to 'boxv.c')
| -rw-r--r-- | boxv.c | 171 |
1 files changed, 171 insertions, 0 deletions
@@ -0,0 +1,171 @@ +/*****************************************************************************
+
+Copyright (c) 2012-2022 Michal Necasek
+
+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.
+
+*****************************************************************************/
+
+/* Core boxv implementation. */
+
+#include "boxv.h" /* Public interface. */
+#include "boxvint.h" /* Implementation internals. */
+#define NEEDVIDEO
+#include "io.h" /* I/O access layer, host specific. */
+
+#pragma code_seg( _INIT )
+
+/* Write a single value to an indexed register at a specified
+ * index. Suitable for the CRTC or graphics controller.
+ */
+inline void vid_wridx( void *cx, int idx_reg, int idx, v_byte data )
+{
+ vid_outw( cx, idx_reg, idx | (data << 8) );
+}
+
+/* Set an extended non-VGA mode with given parameters. 8bpp and higher only.
+ * Returns non-zero value on failure.
+ */
+int BOXV_ext_mode_set( void *cx, int xres, int yres, int bpp, int v_xres, int v_yres )
+{
+ /* Do basic parameter validation. */
+ if( v_xres < xres || v_yres < yres )
+ return( -1 );
+
+ /* Put the hardware into a state where the mode can be safely set. */
+ vid_inb( cx, VGA_STAT_ADDR ); /* Reset flip-flop. */
+ vid_outb( cx, VGA_ATTR_W, 0 ); /* Disable palette. */
+ vid_wridx( cx, VGA_SEQUENCER, VGA_SR_RESET, VGA_SR_RESET );
+
+ /* Disable the extended display registers. */
+ vid_outw( cx, VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_ENABLE );
+ vid_outw( cx, VBE_DISPI_IOPORT_DATA, VBE_DISPI_DISABLED );
+
+ /* Program the extended non-VGA registers. */
+
+ /* Set X resoultion. */
+ vid_outw( cx, VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_XRES );
+ vid_outw( cx, VBE_DISPI_IOPORT_DATA, xres );
+ /* Set Y resoultion. */
+ vid_outw( cx, VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_YRES );
+ vid_outw( cx, VBE_DISPI_IOPORT_DATA, yres );
+ /* Set bits per pixel. */
+ vid_outw( cx, VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_BPP );
+ vid_outw( cx, VBE_DISPI_IOPORT_DATA, bpp );
+ /* Set the virtual resolution. */
+ vid_outw( cx, VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_VIRT_WIDTH );
+ vid_outw( cx, VBE_DISPI_IOPORT_DATA, v_xres );
+ vid_outw( cx, VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_VIRT_HEIGHT );
+ vid_outw( cx, VBE_DISPI_IOPORT_DATA, v_yres );
+ /* Reset the current bank. */
+ vid_outw( cx, VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_BANK );
+ vid_outw( cx, VBE_DISPI_IOPORT_DATA, 0 );
+ /* Set the X and Y display offset to 0. */
+ vid_outw( cx, VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_X_OFFSET );
+ vid_outw( cx, VBE_DISPI_IOPORT_DATA, 0 );
+ vid_outw( cx, VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_Y_OFFSET );
+ vid_outw( cx, VBE_DISPI_IOPORT_DATA, 0 );
+ /* Enable the extended display registers. */
+ vid_outw( cx, VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_ENABLE );
+ vid_outw( cx, VBE_DISPI_IOPORT_DATA, VBE_DISPI_ENABLED | VBE_DISPI_8BIT_DAC );
+
+ /* Re-enable the sequencer. */
+ vid_wridx( cx, VGA_SEQUENCER, VGA_SR_RESET, VGA_SR0_NORESET );
+
+ /* Reset flip-flop again and re-enable palette. */
+ vid_inb( cx, VGA_STAT_ADDR );
+ vid_outb( cx, VGA_ATTR_W, 0x20 );
+
+ return( 0 );
+}
+
+/* Program the DAC. Each of the 'count' entries is 4 bytes in size,
+ * red/green/blue/unused.
+ * Returns non-zero on failure.
+ */
+int BOXV_dac_set( void *cx, unsigned start, unsigned count, void *pal )
+{
+ v_byte *prgbu = pal;
+
+ /* Basic argument validation. */
+ if( start + count > 256 )
+ return( -1 );
+
+ /* Write the starting index. */
+ vid_outb( cx, VGA_DAC_W_INDEX, start );
+ /* Load the RGB data. */
+ while( count-- ) {
+ vid_outb( cx, VGA_DAC_DATA, *prgbu++ );
+ vid_outb( cx, VGA_DAC_DATA, *prgbu++ );
+ vid_outb( cx, VGA_DAC_DATA, *prgbu++ );
+ ++prgbu;
+ }
+ return( 0 );
+}
+
+/* Detect the presence of a supported adapter and amount of installed
+ * video memory. Returns zero if not found.
+ */
+int BOXV_detect( void *cx, unsigned long *vram_size )
+{
+ v_word boxv_id;
+
+ vid_outw( cx, VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_ID );
+ boxv_id = vid_inw( cx, VBE_DISPI_IOPORT_DATA );
+ if( vram_size ) {
+ *vram_size = vid_ind( cx, VBE_DISPI_IOPORT_DATA );
+ }
+ if( boxv_id >= VBE_DISPI_ID0 && boxv_id <= VBE_DISPI_ID4 )
+ return( boxv_id );
+ else
+ return( 0 );
+}
+
+/* Disable extended mode and place the hardware into a VGA compatible state.
+ * Returns non-zero on failure.
+ */
+int BOXV_ext_disable( void *cx )
+{
+ /* Disable the extended display registers. */
+ vid_outw( cx, VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_ENABLE );
+ vid_outw( cx, VBE_DISPI_IOPORT_DATA, VBE_DISPI_DISABLED );
+ return( 0 );
+}
+
+/* Return the physical base address of the framebuffer. Needed in environments
+ * that do not query the base through PCI.
+ */
+unsigned long BOXV_get_lfb_base( void *cx )
+{
+ unsigned long fb_base;
+
+ /* Ask the virtual hardware for the high 16 bits. */
+ vid_outw( cx, VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_FB_BASE_HI );
+ fb_base = vid_inw( cx, VBE_DISPI_IOPORT_DATA );
+
+ /* Old versions didn't support that, so use the default
+ * if the value looks like garbage.
+ */
+ if( fb_base != 0 && fb_base != 0xffff )
+ fb_base = fb_base << 16;
+ else
+ fb_base = VBE_DISPI_LFB_PHYSICAL_ADDRESS;
+
+ return( fb_base );
+}
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