mkos32/source/utils.h

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#pragma once
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/* Taken from OSDEV WIKI */
#define PIC1 0x20 /* IO base address for master PIC */
#define PIC2 0xA0 /* IO base address for slave PIC */
#define PIC1_COMMAND PIC1
#define PIC1_DATA (PIC1+1)
#define PIC2_COMMAND PIC2
#define PIC2_DATA (PIC2+1)
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#define ICW1_ICW4 0x01 /* Indicates that ICW4 will be present */
#define ICW1_SINGLE 0x02 /* Single (cascade) mode */
#define ICW1_INTERVAL4 0x04 /* Call address interval 4 (8) */
#define ICW1_LEVEL 0x08 /* Level triggered (edge) mode */
#define ICW1_INIT 0x10 /* Initialization - required! */
#define ICW4_8086 0x01 /* 8086/88 (MCS-80/85) mode */
#define ICW4_AUTO 0x02 /* Auto (normal) EOI */
#define ICW4_BUF_SLAVE 0x08 /* Buffered mode/slave */
#define ICW4_BUF_MASTER 0x0C /* Buffered mode/master */
#define ICW4_SFNM 0x10 /* Special fully nested (not) */
/* End of taken */
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void breakpoint()
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{
__asm__("xchg %bx, %bx");
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}
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void set_interrupts(bool enabled)
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{
if (enabled)
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{
__asm__ volatile("sti");
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}
else
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{
__asm__ volatile("cli");
}
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}
void outb(uint8_t port_number, uint8_t new_value)
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{
__asm__ volatile(
"outb %[new_value], %[port_number]"
:
:
[port_number] "d" ((unsigned short)port_number),
[new_value] "a" (new_value)
);
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}
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uint8_t inb(uint8_t port_number)
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{
uint8_t out_value;
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__asm__ volatile(
"in %[port_number], %[out_value];"
:
[out_value] "=a" (out_value)
:
[port_number] "d" ((unsigned short)port_number)
);
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return out_value;
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}
static inline void io_wait(void)
{
outb(0x80, 0);
}
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uint8_t cmos_register_value(uint16_t register_number)
{
outb(0x70, register_number);
return inb(0x71);
}
void PIC_remap(int offset1, int offset2)
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{
unsigned char a1, a2;
a1 = inb(PIC1_DATA); // save masks
a2 = inb(PIC2_DATA);
outb(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4); // starts the initialization sequence (in cascade mode)
io_wait();
outb(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4);
io_wait();
outb(PIC1_DATA, offset1); // ICW2: Master PIC vector offset
io_wait();
outb(PIC2_DATA, offset2); // ICW2: Slave PIC vector offset
io_wait();
outb(PIC1_DATA, 4); // ICW3: tell Master PIC that there is a slave PIC at IRQ2 (0000 0100)
io_wait();
outb(PIC2_DATA, 2); // ICW3: tell Slave PIC its cascade identity (0000 0010)
io_wait();
outb(PIC1_DATA, ICW4_8086); // ICW4: have the PICs use 8086 mode (and not 8080 mode)
io_wait();
outb(PIC2_DATA, ICW4_8086);
io_wait();
outb(PIC1_DATA, a1); // restore saved masks.
outb(PIC2_DATA, a2);
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}
void display_date()
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{
uint8_t year = cmos_register_value(0x09);
uint8_t month = cmos_register_value(0x08);
uint8_t day = cmos_register_value(0x07);
uint8_t hours = cmos_register_value(0x04);
uint8_t minutes = cmos_register_value(0x02);
uint8_t seconds = cmos_register_value(0x00);
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terminal_writenumpad(year, 10, 2);
terminal_writestring("-");
terminal_writenumpad(month, 10, 2);
terminal_writestring("-");
terminal_writenumpad(day, 10, 2);
terminal_writestring(" ");
terminal_writenumpad(hours, 10, 2);
terminal_writestring(":");
terminal_writenumpad(minutes, 10, 2);
terminal_writestring(":");
terminal_writenumpad(seconds, 10, 2);
terminal_newline();
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}