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fdt: Expose the model, compatible and freebsd dts brandind as sysctl

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This make it easier for script to get the hardware on which they are running.

MFC after:	1 month
Sponsored by:	Diablotin Systems
Differential Revision:	  https://reviews.freebsd.org/D31205
Reviewed by: 		  imp
Should be ok on powerpc:  jhibbits (over irc)
This commit is contained in:
Emmanuel Vadot 2021-07-17 17:19:22 +02:00
parent 1db1e58d93
commit 50e0dc0c4b
1 changed files with 38 additions and 1 deletions
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39
sys/dev/ofw/ofw_fdt.c
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@ -105,7 +105,14 @@ static ofw_def_t ofw_fdt = {
};
OFW_DEF(ofw_fdt);
#define FDT_FBSDVER_LEN 16
#define FDT_MODEL_LEN 80
#define FDT_COMPAT_LEN 255
static void *fdtp = NULL;
static char fdt_model[FDT_MODEL_LEN];
static char fdt_compatible[FDT_COMPAT_LEN];
static char fdt_fbsd_version[FDT_FBSDVER_LEN];
static int
sysctl_handle_dtb(SYSCTL_HANDLER_ARGS)
@ -125,19 +132,50 @@ sysctl_register_fdt_oid(void *arg)
SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt), OID_AUTO, "dtb",
CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
sysctl_handle_dtb, "", "Device Tree Blob");
if (fdt_model[0] != '\0')
SYSCTL_ADD_STRING(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt),
OID_AUTO, "model", CTLFLAG_RD, fdt_model,
FDT_MODEL_LEN, "System board model");
if (fdt_compatible[0] != '\0')
SYSCTL_ADD_STRING(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt),
OID_AUTO, "compatible", CTLFLAG_RD, fdt_compatible,
FDT_COMPAT_LEN, "Compatible platforms");
if (fdt_fbsd_version[0] != '\0')
SYSCTL_ADD_STRING(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt),
OID_AUTO, "freebsd-version", CTLFLAG_RD, fdt_fbsd_version,
FDT_FBSDVER_LEN, "FreeBSD DTS branding version");
}
SYSINIT(dtb_oid, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_fdt_oid, NULL);
static int
ofw_fdt_init(ofw_t ofw, void *data)
{
phandle_t root;
ssize_t len;
int err;
int i;
/* Check FDT blob integrity */
if ((err = fdt_check_header(data)) != 0)
return (err);
fdtp = data;
root = ofw_fdt_finddevice(NULL, "/");
len = ofw_fdt_getproplen(NULL, root, "model");
bzero(fdt_model, FDT_MODEL_LEN);
ofw_fdt_getprop(NULL, root, "model", fdt_model, FDT_MODEL_LEN);
len = ofw_fdt_getproplen(NULL, root, "compatible");
bzero(fdt_compatible, FDT_COMPAT_LEN);
ofw_fdt_getprop(NULL, root, "compatible", fdt_compatible, FDT_COMPAT_LEN);
/* Replace the middle '\0' with ' ' */
for (i = 0; i < len - 1; i++)
if (fdt_compatible[i] == '\0')
fdt_compatible[i] = ' ';
if ((len = ofw_fdt_getproplen(NULL, root, "freebsd,dts-version")) > 0) {
bzero(fdt_fbsd_version, FDT_FBSDVER_LEN);
ofw_fdt_getprop(NULL, root, "freebsd,dts-version",
fdt_fbsd_version, FDT_FBSDVER_LEN);
}
return (0);
}
@ -411,7 +449,6 @@ ofw_fdt_package_to_path(ofw_t ofw, phandle_t package, char *buf, size_t len)
static int
ofw_fdt_fixup(ofw_t ofw)
{
#define FDT_MODEL_LEN 80
char model[FDT_MODEL_LEN];
phandle_t root;
ssize_t len;