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bhyve: add emulation for the qemu fwcfg selector port

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The selector port is used to select the desired fwcfg item.

Reviewed by:		markj
MFC after:		1 week
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D38332
This commit is contained in:
Corvin Köhne 2021-08-11 09:59:16 +02:00
parent 9b99de77f1
commit 151d8131a8
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GPG Key ID: D854DA56315E026A
1 changed files with 39 additions and 0 deletions
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39
usr.sbin/bhyve/qemu_fwcfg.c
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@ -29,8 +29,33 @@
#define QEMU_FWCFG_DATA_PORT_FLAGS \
IOPORT_F_INOUT /* QEMU v2.4+ ignores writes */
#define QEMU_FWCFG_ARCHITECTURE_MASK 0x0001
#define QEMU_FWCFG_INDEX_MASK 0x3FFF
#define QEMU_FWCFG_SELECT_READ 0
#define QEMU_FWCFG_SELECT_WRITE 1
#define QEMU_FWCFG_ARCHITECTURE_GENERIC 0
#define QEMU_FWCFG_ARCHITECTURE_SPECIFIC 1
#pragma pack(1)
union qemu_fwcfg_selector {
struct {
uint16_t index : 14;
uint16_t writeable : 1;
uint16_t architecture : 1;
};
uint16_t bits;
};
#pragma pack()
struct qemu_fwcfg_softc {
struct acpi_device *acpi_dev;
uint32_t data_offset;
union qemu_fwcfg_selector selector;
};
static struct qemu_fwcfg_softc fwcfg_sc;
@ -40,6 +65,20 @@ qemu_fwcfg_selector_port_handler(struct vmctx *const ctx __unused, const int in,
const int port __unused, const int bytes, uint32_t *const eax,
void *const arg __unused)
{
if (bytes != sizeof(uint16_t)) {
warnx("%s: invalid size (%d) of IO port access", __func__,
bytes);
return (-1);
}
if (in) {
*eax = htole16(fwcfg_sc.selector.bits);
return (0);
}
fwcfg_sc.data_offset = 0;
fwcfg_sc.selector.bits = le16toh(*eax);
return (0);
}