mirror of https://github.com/xemu-project/xemu.git
56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/*
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* QEMU Geforce NV2A implementation
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*
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* Copyright (c) 2012 espes
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* Copyright (c) 2015 Jannik Vogel
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* Copyright (c) 2018 Matt Borgerson
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 or
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* (at your option) version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/* PRMCIO - aliases VGA CRTC and attribute controller registers */
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uint64_t prmcio_read(void *opaque,
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hwaddr addr, unsigned int size)
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{
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NV2AState *d = opaque;
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uint64_t r = vga_ioport_read(&d->vga, addr);
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reg_log_read(NV_PRMCIO, addr, r);
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return r;
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}
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void prmcio_write(void *opaque, hwaddr addr,
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uint64_t val, unsigned int size)
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{
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NV2AState *d = opaque;
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reg_log_write(NV_PRMCIO, addr, val);
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switch (addr) {
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case VGA_ATT_W:
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/* Cromwell sets attrs without enabling VGA_AR_ENABLE_DISPLAY
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* (which should result in a blank screen).
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* Either nvidia's hardware is lenient or it is set through
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* something else. The former seems more likely.
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*/
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if (d->vga.ar_flip_flop == 0) {
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val |= VGA_AR_ENABLE_DISPLAY;
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}
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break;
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default:
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break;
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}
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vga_ioport_write(&d->vga, addr, val);
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}
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