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protect vga access from mutlithread

This commit is contained in:
Mathieu Maret 2020-08-20 23:54:01 +02:00
parent 9fe6d3c7df
commit 0ae9ad7d92
1 changed files with 21 additions and 0 deletions
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21
drivers/vga.c
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@ -1,6 +1,7 @@
#include "vga.h"
#include "io.h"
#include "klibc.h"
#include "irq.h"
static uint vgaBgColor;
static uint vgaColor;
@ -18,20 +19,28 @@ int VGASetup(uint bgColor, uint color)
void clearScreen(uint bgColor)
{
uint32_t flags;
volatile short *vga = (short *)VGA_ADDR;
long int colorAttr = bgColor << 12;
disable_IRQs(flags);
for (int i = 0; i < VGA_WIDTH * VGA_HEIGHT; i++) {
vga[i] = colorAttr;
}
restore_IRQs(flags);
}
void clearScreenLine(uint bgColor, uint line)
{
uint32_t flags;
volatile short *vga = (short *)VGA_ADDR;
long int colorAttr = bgColor << 12;
disable_IRQs(flags);
for (uint i = VGA_WIDTH * line; i < VGA_WIDTH * (line + 1); i++) {
vga[i] = colorAttr;
}
restore_IRQs(flags);
}
void printIntDetails(int integer, uint color, uint bgColor, int startX, int startY)
@ -67,6 +76,9 @@ void vgaScrollUp(void)
{
long int colorAttr = vgaBgColor << 12;
volatile short *vga = (short *)VGA_ADDR;
int flags;
disable_IRQs(flags);
for (int i = 1; i < VGA_HEIGHT - 1; i++) { // last line is status line. Do not scroll it
memcpy((void *)&vga[VGA_WIDTH * (i - 1)], (void *)&vga[VGA_WIDTH * i],
VGA_WIDTH * sizeof(short));
@ -74,10 +86,14 @@ void vgaScrollUp(void)
for (int i = 0; i < VGA_WIDTH; i++) {
vga[(VGA_HEIGHT - 2) * VGA_WIDTH + i] = colorAttr;
}
restore_IRQs(flags);
}
void VGAputc(const char str)
{
int flags;
disable_IRQs(flags);
if (str == '\n') {
line++;
col = 0;
@ -106,18 +122,23 @@ void VGAputc(const char str)
}
}
cursorMove(col, line);
restore_IRQs(flags);
}
void printStringDetails(const char *str, uint color, uint bgColor, int startX, int startY)
{
uint32_t flags;
volatile short *vga = (short *)VGA_ADDR;
int i = 0;
long int colorAttr = (bgColor << 4 | (color & 0x0f)) << 8;
disable_IRQs(flags);
while (*str) {
vga[VGA_WIDTH * startY + startX + i] = colorAttr | *str;
str++;
i++;
}
restore_IRQs(flags);
}
void cursorEnable(uint8_t cursor_start, uint8_t cursor_end)