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bhyve: add helper to add fwcfg items

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This helper makes it easier to add multiple fwcfg items. You can pass an
index and some data to the helper. The helper adds these information to
the fwcfg emulation so that the guest reads the given data on the
specified index.

Reviewed by:		<If someone else reviewed your modification.>
MFC after:		1 week
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D38334
This commit is contained in:
Corvin Köhne 2021-08-11 10:01:19 +02:00
parent 2c33b456ff
commit 3ef46195ac
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GPG key ID: D854DA56315E026A
1 changed files with 25 additions and 0 deletions
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25
usr.sbin/bhyve/qemu_fwcfg.c
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@ -130,6 +130,31 @@ qemu_fwcfg_data_port_handler(struct vmctx *const ctx __unused, const int in,
return (0);
}
static int
qemu_fwcfg_add_item(const uint16_t architecture, const uint16_t index,
const uint32_t size, void *const data)
{
/* truncate architecture and index to their desired size */
const uint16_t arch = architecture & QEMU_FWCFG_ARCHITECTURE_MASK;
const uint16_t idx = index & QEMU_FWCFG_INDEX_MASK;
/* get pointer to item specified by selector */
struct qemu_fwcfg_item *const fwcfg_item = &fwcfg_sc.items[arch][idx];
/* check if item is already used */
if (fwcfg_item->data != NULL) {
warnx("%s: qemu fwcfg item exists (architecture %s index 0x%x)",
__func__, arch ? "specific" : "generic", idx);
return (-1);
}
/* save data of the item */
fwcfg_item->size = size;
fwcfg_item->data = data;
return (0);
}
static int
qemu_fwcfg_register_port(const char *const name, const int port, const int size,
const int flags, const inout_func_t handler)