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Share VGA and SVGA memory, make size configurable

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copy 2013-11-28 01:31:33 +01:00
parent f56d593a10
commit 419c3d1098
1 changed files with 39 additions and 18 deletions
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57
src/vga.js
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@ -4,17 +4,17 @@
/**
* @constructor
*/
function VGAScreen(dev, adapter)
function VGAScreen(dev, adapter, vga_memory_size)
{
var
io = dev.io,
memory = dev.memory,
/**
* TODO: Make this configurable
* Always 64k
* @const
*/
SVGA_MEMORY_SIZE = 128 * 64 * 1024,
VGA_BANK_SIZE = 64 * 1024,
/** @const */
MAX_XRES = 1280,
@ -82,15 +82,6 @@ function VGAScreen(dev, adapter)
*/
vga256_palette = new Int32Array(256),
// 4 times 64k
// Could be shared with SVGA memory
vga_memory = new Uint8Array(4 * 64 * 1024),
plane0 = new Uint8Array(vga_memory.buffer, 0 * 64 * 1024, 64 * 1024),
plane1 = new Uint8Array(vga_memory.buffer, 1 * 64 * 1024, 64 * 1024),
plane2 = new Uint8Array(vga_memory.buffer, 2 * 64 * 1024, 64 * 1024),
plane3 = new Uint8Array(vga_memory.buffer, 3 * 64 * 1024, 64 * 1024),
// VGA latches
latch0 = 0,
latch1 = 0,
@ -98,7 +89,7 @@ function VGAScreen(dev, adapter)
latch3 = 0,
svga_memory = new Uint8Array(SVGA_MEMORY_SIZE),
svga_memory,
svga_enabled = false,
/** @type {number} */
@ -108,7 +99,17 @@ function VGAScreen(dev, adapter)
svga_height = 0,
/** @type {number} */
svga_bpp = 0;
svga_bpp = 0,
// 4 times 64k
vga_memory,
plane0,
plane1,
plane2,
plane3;
// Experimental, could probably need some changes
// 01:00.0 VGA compatible controller: NVIDIA Corporation GT216 [GeForce GT 220] (rev a2)
@ -122,12 +123,32 @@ function VGAScreen(dev, adapter)
function init()
{
if(vga_memory_size < 4 * VGA_BANK_SIZE)
{
vga_memory_size = 4 * VGA_BANK_SIZE;
dbg_log("vga memory size rounded up to " + vga_memory_size, LOG_VGA);
}
else if(vga_memory_size & (VGA_BANK_SIZE - 1))
{
// round up to next 64k
vga_memory_size |= VGA_BANK_SIZE - 1;
vga_memory_size++;
}
svga_memory = new Uint8Array(vga_memory_size);
vga_memory = new Uint8Array(svga_memory.buffer, 0, 4 * VGA_BANK_SIZE);
plane0 = new Uint8Array(svga_memory.buffer, 0 * VGA_BANK_SIZE, VGA_BANK_SIZE);
plane1 = new Uint8Array(svga_memory.buffer, 1 * VGA_BANK_SIZE, VGA_BANK_SIZE);
plane2 = new Uint8Array(svga_memory.buffer, 2 * VGA_BANK_SIZE, VGA_BANK_SIZE);
plane3 = new Uint8Array(svga_memory.buffer, 3 * VGA_BANK_SIZE, VGA_BANK_SIZE);
screen.set_size_text(80, 25);
screen.update_cursor_scanline();
memory.mmap_register(0xA0000, 0x20000, vga_memory_read, vga_memory_write);
memory.mmap_register(0xE0000000, SVGA_MEMORY_SIZE, svga_memory_read, svga_memory_write);
memory.mmap_register(0xE0000000, vga_memory_size, svga_memory_read, svga_memory_write);
}
function vga_memory_read(addr)
@ -992,7 +1013,7 @@ function VGAScreen(dev, adapter)
return MAX_BPP;
case 0x0A:
// memory size in 64 kilobyte banks
return SVGA_MEMORY_SIZE / 64 / 1024;
return vga_memory_size / VGA_BANK_SIZE | 0;
default:
}
dbg_log("1CF / dispi read low " + h(dispi_index), LOG_VGA);
@ -1013,7 +1034,7 @@ function VGAScreen(dev, adapter)
case 3:
return MAX_BPP >> 8;
case 0x0A:
return SVGA_MEMORY_SIZE / 64 / 1024 >> 8;
return vga_memory_size / VGA_BANK_SIZE >> 8;
default:
}
dbg_log("1D0 / dispi read high " + h(dispi_index), LOG_VGA);