d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Support the bootloader's single 16-bit 'outw' access to the Divisor

Browse Source 
Latch MSB and LSB registers.

Approved by:	neel (co-mentor)
This commit is contained in:
tychon 2014-03-16 12:31:28 +00:00
parent eb89966ba2
commit e4c43b0780
1 changed files with 19 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
usr.sbin/bhyve/pci_lpc.c
View File

@ -125,15 +125,27 @@ lpc_uart_io_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
int offset;
struct lpc_uart_softc *sc = arg;
if (bytes != 1)
return (-1);
offset = port - sc->iobase;
if (in)
*eax = uart_read(sc->uart_softc, offset);
else
uart_write(sc->uart_softc, offset, *eax);
switch (bytes) {
case 1:
if (in)
*eax = uart_read(sc->uart_softc, offset);
else
uart_write(sc->uart_softc, offset, *eax);
break;
case 2:
if (in) {
*eax = uart_read(sc->uart_softc, offset);
*eax |= uart_read(sc->uart_softc, offset + 1) << 8;
} else {
uart_write(sc->uart_softc, offset, *eax);
uart_write(sc->uart_softc, offset + 1, *eax >> 8);
}
break;
default:
return (-1);
}
return (0);
}