root / hw / milkymist-vgafb.c @ 26d53979
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/*
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* QEMU model of the Milkymist VGA framebuffer.
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*
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* Copyright (c) 2010 Michael Walle <michael@walle.cc>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*
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* Specification available at:
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* http://www.milkymist.org/socdoc/vgafb.pdf
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*/
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#include "hw.h" |
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#include "sysbus.h" |
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#include "trace.h" |
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#include "console.h" |
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#include "framebuffer.h" |
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#include "pixel_ops.h" |
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#include "qemu-error.h" |
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#define BITS 8 |
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#include "milkymist-vgafb_template.h" |
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#define BITS 15 |
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#include "milkymist-vgafb_template.h" |
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#define BITS 16 |
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#include "milkymist-vgafb_template.h" |
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#define BITS 24 |
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#include "milkymist-vgafb_template.h" |
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#define BITS 32 |
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#include "milkymist-vgafb_template.h" |
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enum {
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R_CTRL = 0,
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R_HRES, |
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R_HSYNC_START, |
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R_HSYNC_END, |
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R_HSCAN, |
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R_VRES, |
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R_VSYNC_START, |
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R_VSYNC_END, |
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R_VSCAN, |
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R_BASEADDRESS, |
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R_BASEADDRESS_ACT, |
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R_BURST_COUNT, |
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R_SOURCE_CLOCK, |
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R_MAX |
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}; |
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enum {
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CTRL_RESET = (1<<0), |
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}; |
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struct MilkymistVgafbState {
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SysBusDevice busdev; |
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DisplayState *ds; |
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int invalidate;
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uint32_t fb_offset; |
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uint32_t fb_mask; |
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uint32_t regs[R_MAX]; |
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}; |
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typedef struct MilkymistVgafbState MilkymistVgafbState; |
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static int vgafb_enabled(MilkymistVgafbState *s) |
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{ |
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return !(s->regs[R_CTRL] & CTRL_RESET);
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} |
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static void vgafb_update_display(void *opaque) |
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{ |
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MilkymistVgafbState *s = opaque; |
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int first = 0; |
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int last = 0; |
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drawfn fn; |
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if (!vgafb_enabled(s)) {
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return;
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} |
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int dest_width = s->regs[R_HRES];
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switch (ds_get_bits_per_pixel(s->ds)) {
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case 0: |
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return;
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case 8: |
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fn = draw_line_8; |
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break;
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case 15: |
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fn = draw_line_15; |
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dest_width *= 2;
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break;
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case 16: |
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fn = draw_line_16; |
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dest_width *= 2;
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break;
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case 24: |
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fn = draw_line_24; |
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dest_width *= 3;
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break;
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case 32: |
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fn = draw_line_32; |
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dest_width *= 4;
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break;
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default:
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hw_error("milkymist_vgafb: bad color depth\n");
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break;
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} |
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framebuffer_update_display(s->ds, |
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s->regs[R_BASEADDRESS] + s->fb_offset, |
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s->regs[R_HRES], |
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s->regs[R_VRES], |
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s->regs[R_HRES] * 2,
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dest_width, |
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0,
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s->invalidate, |
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fn, |
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NULL,
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&first, &last); |
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if (first >= 0) { |
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dpy_update(s->ds, 0, first, s->regs[R_HRES], last - first + 1); |
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} |
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s->invalidate = 0;
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} |
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static void vgafb_invalidate_display(void *opaque) |
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{ |
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MilkymistVgafbState *s = opaque; |
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s->invalidate = 1;
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} |
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static void vgafb_resize(MilkymistVgafbState *s) |
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{ |
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if (!vgafb_enabled(s)) {
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return;
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} |
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qemu_console_resize(s->ds, s->regs[R_HRES], s->regs[R_VRES]); |
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s->invalidate = 1;
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} |
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static uint32_t vgafb_read(void *opaque, target_phys_addr_t addr) |
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{ |
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MilkymistVgafbState *s = opaque; |
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uint32_t r = 0;
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addr >>= 2;
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switch (addr) {
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case R_CTRL:
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case R_HRES:
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case R_HSYNC_START:
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case R_HSYNC_END:
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case R_HSCAN:
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case R_VRES:
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case R_VSYNC_START:
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case R_VSYNC_END:
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case R_VSCAN:
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case R_BASEADDRESS:
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case R_BURST_COUNT:
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case R_SOURCE_CLOCK:
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r = s->regs[addr]; |
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break;
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case R_BASEADDRESS_ACT:
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r = s->regs[R_BASEADDRESS]; |
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break;
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default:
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error_report("milkymist_vgafb: read access to unknown register 0x"
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TARGET_FMT_plx, addr << 2);
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break;
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} |
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trace_milkymist_vgafb_memory_read(addr << 2, r);
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return r;
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} |
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static void |
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vgafb_write(void *opaque, target_phys_addr_t addr, uint32_t value)
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{ |
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MilkymistVgafbState *s = opaque; |
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trace_milkymist_vgafb_memory_write(addr, value); |
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addr >>= 2;
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switch (addr) {
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case R_CTRL:
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s->regs[addr] = value; |
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vgafb_resize(s); |
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break;
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case R_HSYNC_START:
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case R_HSYNC_END:
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case R_HSCAN:
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case R_VSYNC_START:
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case R_VSYNC_END:
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case R_VSCAN:
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case R_BURST_COUNT:
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case R_SOURCE_CLOCK:
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s->regs[addr] = value; |
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break;
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case R_BASEADDRESS:
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if (value & 0x1f) { |
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error_report("milkymist_vgafb: framebuffer base address have to "
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"be 32 byte aligned");
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break;
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} |
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s->regs[addr] = value & s->fb_mask; |
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s->invalidate = 1;
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break;
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case R_HRES:
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case R_VRES:
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s->regs[addr] = value; |
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vgafb_resize(s); |
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break;
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case R_BASEADDRESS_ACT:
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error_report("milkymist_vgafb: write to read-only register 0x"
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TARGET_FMT_plx, addr << 2);
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break;
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default:
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error_report("milkymist_vgafb: write access to unknown register 0x"
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TARGET_FMT_plx, addr << 2);
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break;
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} |
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} |
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static CPUReadMemoryFunc * const vgafb_read_fn[] = { |
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NULL,
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NULL,
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&vgafb_read |
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}; |
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static CPUWriteMemoryFunc * const vgafb_write_fn[] = { |
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NULL,
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NULL,
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&vgafb_write |
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}; |
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static void milkymist_vgafb_reset(DeviceState *d) |
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{ |
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MilkymistVgafbState *s = container_of(d, MilkymistVgafbState, busdev.qdev); |
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int i;
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for (i = 0; i < R_MAX; i++) { |
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s->regs[i] = 0;
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} |
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/* defaults */
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s->regs[R_CTRL] = CTRL_RESET; |
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s->regs[R_HRES] = 640;
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s->regs[R_VRES] = 480;
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s->regs[R_BASEADDRESS] = 0;
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} |
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static int milkymist_vgafb_init(SysBusDevice *dev) |
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{ |
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MilkymistVgafbState *s = FROM_SYSBUS(typeof(*s), dev); |
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int vgafb_regs;
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vgafb_regs = cpu_register_io_memory(vgafb_read_fn, vgafb_write_fn, s, |
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DEVICE_NATIVE_ENDIAN); |
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sysbus_init_mmio(dev, R_MAX * 4, vgafb_regs);
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s->ds = graphic_console_init(vgafb_update_display, |
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vgafb_invalidate_display, |
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NULL, NULL, s); |
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return 0; |
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} |
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static int vgafb_post_load(void *opaque, int version_id) |
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{ |
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vgafb_invalidate_display(opaque); |
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return 0; |
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} |
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static const VMStateDescription vmstate_milkymist_vgafb = { |
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.name = "milkymist-vgafb",
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.version_id = 1,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.post_load = vgafb_post_load, |
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.fields = (VMStateField[]) { |
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VMSTATE_UINT32_ARRAY(regs, MilkymistVgafbState, R_MAX), |
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VMSTATE_END_OF_LIST() |
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} |
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}; |
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static SysBusDeviceInfo milkymist_vgafb_info = {
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.init = milkymist_vgafb_init, |
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.qdev.name = "milkymist-vgafb",
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.qdev.size = sizeof(MilkymistVgafbState),
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.qdev.vmsd = &vmstate_milkymist_vgafb, |
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.qdev.reset = milkymist_vgafb_reset, |
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.qdev.props = (Property[]) { |
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DEFINE_PROP_UINT32("fb_offset", MilkymistVgafbState, fb_offset, 0x0), |
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DEFINE_PROP_UINT32("fb_mask", MilkymistVgafbState, fb_mask, 0xffffffff), |
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DEFINE_PROP_END_OF_LIST(), |
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} |
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}; |
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static void milkymist_vgafb_register(void) |
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{ |
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sysbus_register_withprop(&milkymist_vgafb_info); |
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} |
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device_init(milkymist_vgafb_register) |