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qemu_pci_serial driver

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This commit is contained in:
Kamil Kowalczyk
2025-11-23 22:56:45 +01:00
parent d3a91b6438
commit 33b3a641fb
10 changed files with 141 additions and 99 deletions
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111
kernel/pci/qemu_pci_serial/qemu_pci_serial.c Normal file
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#include <stdint.h>
#include <stddef.h>
#include "pci/pci.h"
#include "pci/qemu_pci_serial/qemu_pci_serial.h"
#include "io/io.h"
#include "sysdefs/dev.h"
#include "util/util.h"
#include "dev/dev.h"
#include "errors.h"
#include "hshtb.h"
#include "kprintf.h"
static QemuPciSerialDev QEMU_PCI_SERIAL_DEV;
// https://wiki.osdev.org/Serial_Ports
void _serial_init(uint16_t iobase) {
io_out8(iobase+1, 0x00);
io_out8(iobase+3, 0x80);
io_out8(iobase+0, 0x03);
io_out8(iobase+1, 0x00);
io_out8(iobase+3, 0x03);
io_out8(iobase+2, 0xC7);
io_out8(iobase+4, 0x0B);
io_out8(iobase+4, 0x1E);
io_out8(iobase+0, 0xAE);
if (io_in8(iobase+0) != 0xAE) {
ERR("pci", "QEMU_PCI_SERIAL serial is faulty!\n");
return;
}
io_out8(iobase+4, 0x0F);
}
int _serial_recvready(uint16_t iobase) {
return io_in8(iobase+5) & 1;
}
uint8_t _serial_recvb(uint16_t iobase) {
return io_in8(iobase);
}
int _serial_sendready(uint16_t iobase) {
return io_in8(iobase+5) & 0x20;
}
void _serial_sendb(uint16_t iobase, uint8_t b) {
io_out8(iobase, b);
}
int32_t qemu_pci_serial_dev_sendb(struct Dev *dev, uint8_t *buffer, size_t len, uint64_t pid) {
(void)len; (void)pid;
QemuPciSerialDev *qpsd = dev->extra;
_serial_sendb(qpsd->iobase, buffer[0]);
return E_OK;
}
int32_t qemu_pci_serial_dev_sendready(struct Dev *dev, uint8_t *buffer, size_t len, uint64_t pid) {
(void)buffer; (void)len; (void)pid;
QemuPciSerialDev *qpsd = dev->extra;
return _serial_sendready(qpsd->iobase);
}
int32_t qemu_pci_serial_dev_recvb(struct Dev *dev, uint8_t *buffer, size_t len, uint64_t pid) {
(void)buffer; (void)len; (void)pid;
QemuPciSerialDev *qpsd = dev->extra;
return _serial_recvb(qpsd->iobase);
}
int32_t qemu_pci_serial_dev_recvready(struct Dev *dev, uint8_t *buffer, size_t len, uint64_t pid) {
(void)dev; (void)buffer; (void)len; (void)pid;
QemuPciSerialDev *qpsd = dev->extra;
return _serial_recvready(qpsd->iobase);
}
void pci_qemu_pci_serial_init(void) {
PciDev dev = pci_getdev(0x1B36, 0x0002, -1);
if (!dev.bits) {
return;
}
uint32_t bar0 = pci_read(dev, PCI_BAR0);
LOG("pci", "QEMU_PCI_SERIAL bar0=0x%x\n", bar0);
uint16_t iobase = bar0 & 0xFFFFFFFC;
LOG("pci", "QEMU_PCI_SERIAL iobase=0x%x\n", iobase);
QEMU_PCI_SERIAL_DEV._magic = QEMU_PCI_SERIAL_MAGIC;
QEMU_PCI_SERIAL_DEV.iobase = iobase;
Dev *serialdev = NULL;
HSHTB_ALLOC(DEVTABLE.devs, ident, "serialdev", serialdev);
serialdev->fns[0] = &qemu_pci_serial_dev_sendb;
serialdev->fns[1] = &qemu_pci_serial_dev_sendready;
serialdev->fns[2] = &qemu_pci_serial_dev_recvb;
serialdev->fns[3] = &qemu_pci_serial_dev_recvready;
spinlock_init(&serialdev->spinlock);
serialdev->extra = &QEMU_PCI_SERIAL_DEV;
_serial_init(QEMU_PCI_SERIAL_DEV.iobase);
}