BarinkOS/src/kernel/kernel.cpp

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#include "kernel.h"
/**
* simple delay function
**/
void delay(int t){
volatile int i,j;
for(i=0;i<t;i++)
for(j=0;j<25000;j++)
asm("NOP");
}
class Test {
public:
Test();
void printMe();
~Test();
};
Test::Test(){
kterm_writestring("Create a test object\n");
};
void Test::printMe(){
kterm_writestring("testObject.printMe()\n");
}
Test::~Test(){
kterm_writestring("Destroy testObject! Bye bye\n");
}
#define PORT 0x3f8
static int init_serial() {
outb(PORT + 1, 0x00); // Disable all interrupts
outb(PORT + 3, 0x80); // Enable DLAB (set baud rate divisor)
outb(PORT + 0, 0x03); // Set divisor to 3 (lo byte) 38400 baud
outb(PORT + 1, 0x00); // (hi byte)
outb(PORT + 3, 0x03); // 8 bits, no parity, one stop bit
outb(PORT + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold
outb(PORT + 4, 0x0B); // IRQs enabled, RTS/DSR set
outb(PORT + 4, 0x1E); // Set in loopback mode, test the serial chip
outb(PORT + 0, 0xAE); // Test serial chip (send byte 0xAE and check if serial returns same byte)
// Check if serial is faulty (i.e: not same byte as sent)
if(inb(PORT + 0) != 0xAE) {
return 1;
}
// If serial is not faulty set it in normal operation mode
// (not-loopback with IRQs enabled and OUT#1 and OUT#2 bits enabled)
outb(PORT + 4, 0x0F);
return 0;
}
int is_transmit_empty() {
return inb(PORT + 5) & 0x20;
}
void write_serial(char a) {
while (is_transmit_empty() == 0);
outb(PORT,a);
}
int serial_received() {
return inb(PORT + 5) & 1;
}
char read_serial() {
while (serial_received() == 0);
return inb(PORT);
}
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void print_serial(const char* string ){
for(size_t i = 0; i < strlen(string); i ++){
write_serial(string[i]);
}
}
void test_serial(){
/** Serial test **/
kterm_writestring("Writing to COM1 serial port:");
init_serial();
write_serial('A');
write_serial('B');
write_serial('C');
write_serial('D');
write_serial('E');
char Character_received = read_serial();
kterm_writestring("\n");
kterm_writestring("received from COM 1: \n");
kterm_put(Character_received);
kterm_writestring("\n");
}
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extern "C" {
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void early_main(){
init_serial();
print_serial("\033[31;42mEarly main called!\n");
}
void kernel_main (void) {
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print_serial("\033[31;42mKernel main called!\n");
/** initialize terminal interface */
kterm_init();
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/** Setup the MMU **/
kterm_writestring("Starting MMU...\n");
auto mmu = MMU();
mmu.enable();
kterm_writestring("MMU enabled!\n");
/** Wrtite stuff to the screen to test the terminal**/
kterm_writestring("Hello world!\n");
kterm_writestring("We got newline support!\n");
/** Test scrolling **/
for(int i=0; i < 5; i++){
delay(500);
kterm_writestring("We have implemented terminal scrolling!\n");
}
/** Test objective cpp **/
kterm_writestring("Testing C++ object support\n");
auto testObject = Test();
testObject.printMe();
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/** test interrupt handlers **/
//asm volatile ("int $0x3");
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//asm volatile ("int $0x4");
/** Lets start using the serial port for debugging .. **/
// Hopefully once we go into realmode or do something that
// cause the screen to go black.. this serial comms part will give
// some situational awareness
//Serial serialbus = Serial::init();
}
}