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os-k/kaleid/kernel/io/vga.c

108 lines
3.9 KiB
C

//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
// Desc: VGA terminal functions //
// //
// //
// Copyright © 2018-2019 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K is free software: you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation, either version 3 of the License, or //
// any later version. //
// //
// OS/K is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY//without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
#include <kernel/term.h>
//----------------------------------------------------------//
// Internal functions for VGA terminals //
// These DO NOT check input correctness //
//----------------------------------------------------------//
//
// VGA-related macros
//
#define VGA_ComputeColorCode(fg, bg) ((fg) | (bg) << 4)
#define VGA_ComputeOffset(term, x, y) ((y) * (term)->width + (x))
#define VGA_ComputeEntry(ch, cl) (((ushort)(ch)) | (ushort)(cl) << 8)
//
// Clears terminal
//
error_t VGA_ClearTermUnlocked(Terminal_t *term)
{
const uchar color = VGA_ComputeColorCode(term->fgColor, term->bgColor);
const ushort filler = VGA_ComputeEntry(' ', color);
const size_t bufsize = term->width * term->height;
// Fill the buffer
memsetw((ushort *)term->data, filler, bufsize);
// XXX update cursor too
term->currentX = term->currentY = 0;
return EOK;
}
//
// Writes a single character on the terminal
//
error_t VGA_PutOnTermUnlocked(Terminal_t *term, char ch)
{
ushort *buffer = (ushort *)term->data;
const size_t offset = VGA_ComputeOffset(term, term->currentX, term->currentY);
buffer[offset] = VGA_ComputeEntry(ch, VGA_ComputeColorCode(term->fgColor, term->bgColor));
return EOK;
}
//
// VGA output
//
Terminal_t VGA_Terminal = {
.initDone = FALSE,
.lock = INITLOCK(KLOCK_MUTEX),
.name = "VGA Output Terminal",
.type = "VGA",
.data = (void *)0,
.width = 0,
.height = 0,
.currentX = 0,
.currentY = 0,
.tabSize = KTABSIZE,
.fgColor = KTERM_COLOR_LGREY,
.bgColor = KTERM_COLOR_BLACK,
.clear = VGA_ClearTermUnlocked,
.putchar = VGA_PutOnTermUnlocked,
};
//
// Initialize VGA output
//
void VGA_Init(void)
{
KalAssert(VGA_Terminal.initDone != INITOK);
//Use the infos provided in the BootInfo_t structure
VGA_Terminal.data = GetBootInfo(video).framebufferAddr;
VGA_Terminal.width = GetBootInfo(video).framebufferWidth;
VGA_Terminal.height = GetBootInfo(video).framebufferHeight;
VGA_Terminal.initDone = INITOK;
}