From 912d2e3c7eb1baa71dda2c0a28aa5809eaa96f27 Mon Sep 17 00:00:00 2001 From: dzwdz Date: Sat, 16 Jul 2022 13:33:00 +0200 Subject: amd64: barely boot into kernel code --- src/kernel/arch/amd64/interrupts/irq.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 src/kernel/arch/amd64/interrupts/irq.c (limited to 'src/kernel/arch/amd64/interrupts/irq.c') diff --git a/src/kernel/arch/amd64/interrupts/irq.c b/src/kernel/arch/amd64/interrupts/irq.c new file mode 100644 index 0000000..74bc48c --- /dev/null +++ b/src/kernel/arch/amd64/interrupts/irq.c @@ -0,0 +1,33 @@ +#include +#include +#include + +static const int PIC1 = 0x20; +static const int PIC2 = 0xA0; + +void irq_init(void) { + port_out8(PIC1, 0x11); /* start init sequence */ + port_out8(PIC2, 0x11); + + port_out8(PIC1+1, 0x20); /* interrupt offsets */ + port_out8(PIC2+1, 0x30); + + port_out8(PIC1+1, 0x4); /* just look at the osdev wiki lol */ + port_out8(PIC2+1, 0x2); + + port_out8(PIC1+1, 0x1); /* 8086 mode */ + port_out8(PIC2+1, 0x1); + + uint8_t mask = 0xff; + mask &= ~(1 << 1); // keyboard + mask &= ~(1 << 4); // COM1 + + port_out8(PIC1+1, mask); + port_out8(PIC2+1, 0xff); +} + +void irq_eoi(uint8_t line) { + port_out8(PIC1, 0x20); + if (line >= 8) + port_out8(PIC2, 0x20); +} -- cgit v1.2.3