153 lines
4.8 KiB
C++
153 lines
4.8 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2015.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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vga.cpp
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A Video Graphics Array driver.
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*******************************************************************************/
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#include <errno.h>
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#include <string.h>
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#include <sortix/kernel/descriptor.h>
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#include <sortix/kernel/inode.h>
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#include <sortix/kernel/interlock.h>
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#include <sortix/kernel/ioctx.h>
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#include <sortix/kernel/ioport.h>
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/kthread.h>
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#include <sortix/kernel/process.h>
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#include <sortix/kernel/refcount.h>
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#include <sortix/kernel/scheduler.h>
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#include <sortix/kernel/syscall.h>
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#include "fs/util.h"
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#include "vga.h"
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#include "vgafont.h"
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namespace Sortix {
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namespace VGA {
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uint8_t* const VGA = (uint8_t* const) 0xB8000;
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const unsigned WIDTH = 80;
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const unsigned HEIGHT = 25;
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const size_t VGA_SIZE = sizeof(uint16_t) * WIDTH * HEIGHT;
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static void WriteIndex(uint16_t port, uint8_t index, uint8_t value)
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{
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outport8(port, index);
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outport8(port+1, value);
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}
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static uint8_t ReadIndex(uint16_t port, uint8_t index)
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{
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outport8(port, index);
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return inport8(port+1);
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}
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static uint8_t ReplaceIndex(uint16_t port, uint8_t index, uint8_t value)
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{
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uint8_t ret = ReadIndex(port, index);
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WriteIndex(port, index, value);
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return ret;
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}
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static void FetchVGAFont(uint8_t* font)
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{
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// TODO: I just got these magic constants off the net.
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// Select plane 2 for reading.
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uint8_t old_03ce_04 = ReplaceIndex(0x03CE, 0x04, 0x02);
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// Clear even/odd mode.
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uint8_t old_03ce_05 = ReplaceIndex(0x03CE, 0x05, 0x04);
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// Map VGA Memory to 0xA0000 (Select 0xA0000-0xAFFFF).
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uint8_t old_03ce_06 = ReplaceIndex(0x03CE, 0x06, 0x04);
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// Set bitplane 2.
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uint8_t old_03c4_02 = ReplaceIndex(0x03C4, 0x02, 0x04);
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// Clear even/odd mode (the other way, don't ask why).
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uint8_t old_03c4_04 = ReplaceIndex(0x03C4, 0x04, 0x07);
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// The font data is now at 0xA0000, so fetch it. Note that there is
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// reserved room for a 8x32 resolution but we are using 8x16.
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const uint8_t* data = (const uint8_t*) 0xA0000UL;
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// Patch the replacement chararacter onto character 0.
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memcpy((uint8_t*) data + ((32*8)/8 * 0), font_replacement_character, VGA_FONT_CHARSIZE);
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for ( size_t i = 0; i < VGA_FONT_NUMCHARS; i++ )
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{
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const uint8_t* src = data + (32*8)/8 * i;
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uint8_t* dest = font + VGA_FONT_CHARSIZE * i;
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memcpy(dest, src, VGA_FONT_CHARSIZE);
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}
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// Restore the VGA state.
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WriteIndex(0x03C4, 0x02, old_03c4_02);
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WriteIndex(0x03C4, 0x04, old_03c4_04);
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WriteIndex(0x03CE, 0x05, old_03ce_05);
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WriteIndex(0x03CE, 0x06, old_03ce_06);
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WriteIndex(0x03CE, 0x04, old_03ce_04);
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}
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const uint8_t* GetFont()
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{
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return vgafont;
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}
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void Init(const char* devpath, Ref<Descriptor> slashdev)
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{
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if ( !Log::fallback_framebuffer )
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FetchVGAFont(vgafont);
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ioctx_t ctx; SetupKernelIOCtx(&ctx);
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// Setup the vgafont device.
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Ref<Inode> vgafontnode(new UtilMemoryBuffer(slashdev->dev, (ino_t) 0, 0, 0,
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0660, vgafont, sizeof(vgafont),
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false, false));
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if ( !vgafontnode )
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PanicF("Unable to allocate %s/vgafont inode.", devpath);
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if ( LinkInodeInDir(&ctx, slashdev, "vgafont", vgafontnode) != 0 )
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PanicF("Unable to link %s/vgafont to vga font.", devpath);
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if ( Log::fallback_framebuffer )
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return;
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// Setup the vga device.
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Ref<Inode> vganode(new UtilMemoryBuffer(slashdev->dev, (ino_t) 0, 0, 0,
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0660, VGA, VGA_SIZE, true, false));
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if ( !vganode )
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PanicF("Unable to allocate %s/vga inode.", devpath);
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if ( LinkInodeInDir(&ctx, slashdev, "vga", vganode) != 0 )
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PanicF("Unable to link %s/vga to vga.", devpath);
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}
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// Changes the position of the hardware cursor.
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void SetCursor(unsigned x, unsigned y)
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{
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unsigned value = x + y * WIDTH;
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// This sends a command to indicies 14 and 15 in the
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// CRT Control Register of the VGA controller. These
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// are the high and low bytes of the index that show
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// where the hardware cursor is to be 'blinking'.
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outport8(0x3D4, 14);
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outport8(0x3D5, (value >> 8) & 0xFF);
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outport8(0x3D4, 15);
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outport8(0x3D5, (value >> 0) & 0xFF);
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}
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} // namespace VGA
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} // namespace Sortix
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