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	Index: head/sys/dev/bhnd/nvram/bhnd_nvram_data.h
	===================================================================
	--- head/sys/dev/bhnd/nvram/bhnd_nvram_data.h
	+++ head/sys/dev/bhnd/nvram/bhnd_nvram_data.h
	@@ -105,6 +105,11 @@
	bhnd_nvram_data_class *classes[],
	size_t num_classes);

	+int bhnd_nvram_data_getvar_direct(
	+ bhnd_nvram_data_class *cls,
	+ struct bhnd_nvram_io io, const char name,
	+ void buf, size_t len, bhnd_nvram_type type);
	+
	int bhnd_nvram_data_new(bhnd_nvram_data_class *cls,
	struct bhnd_nvram_data **nv,
	struct bhnd_nvram_io *io);
	Index: head/sys/dev/bhnd/nvram/bhnd_nvram_data.c
	===================================================================
	--- head/sys/dev/bhnd/nvram/bhnd_nvram_data.c
	+++ head/sys/dev/bhnd/nvram/bhnd_nvram_data.c
	@@ -228,6 +228,41 @@
	}

	/**
	+ * Read a variable directly from @p io and decode as @p type.
	+ *
	+ * This may be used to perform reading of NVRAM variables during the very
	+ * early boot process, prior to the availability of the kernel allocator.
	+ *
	+ * @param cls An NVRAM class capable of parsing @p io.
	+ * @param io NVRAM data to be parsed.
	+ * @param name The raw name of the variable to be fetched,
	+ * including any device path (/pci/1/1/varname) or
	+ * alias prefix (0:varname).
	+ * @param[out] buf On success, the requested value will be written
	+ * to this buffer. This argment may be NULL if
	+ * the value is not desired.
	+ * @param[in,out] len The capacity of @p buf. On success, will be set
	+ * to the actual size of the requested value.
	+ * @param type The data type to be written to @p buf.
	+ *
	+ * @retval 0 success
	+ * @retval ENOMEM If @p buf is non-NULL and a buffer of @p len is too
	+ * small to hold the requested value.
	+ * @retval ENOENT If @p name is not found in @p io.
	+ * @retval EFTYPE If the variable data cannot be coerced to @p type.
	+ * @retval ERANGE If value coercion would overflow @p type.
	+ * @retval non-zero If parsing @p io otherwise fails, a regular unix error
	+ * code will be returned.
	+ */
	+int
	+bhnd_nvram_data_getvar_direct(bhnd_nvram_data_class *cls,
	+ struct bhnd_nvram_io io, const char name, void buf, size_t len,
	+ bhnd_nvram_type type)
	+{
	+ return (cls->op_getvar_direct(io, name, buf, len, type));
	+}
	+
	+/**
	* Allocate and initialize a new instance of data class @p cls, copying and
	* parsing NVRAM data from @p io.
	*
	Index: head/sys/dev/bhnd/nvram/bhnd_nvram_data_bcm.c
	===================================================================
	--- head/sys/dev/bhnd/nvram/bhnd_nvram_data_bcm.c
	+++ head/sys/dev/bhnd/nvram/bhnd_nvram_data_bcm.c
	@@ -144,9 +144,229 @@
	if (le32toh(hdr.magic) != BCM_NVRAM_MAGIC)
	return (ENXIO);

	+ if (le32toh(hdr.size) > bhnd_nvram_io_getsize(io))
	+ return (ENXIO);
	+
	return (BHND_NVRAM_DATA_PROBE_DEFAULT);
	}

	+/**
	+ * Parser states for bhnd_nvram_bcm_getvar_direct_common().
	+ */
	+typedef enum {
	+ BCM_PARSE_KEY_START,
	+ BCM_PARSE_KEY_CONT,
	+ BCM_PARSE_KEY,
	+ BCM_PARSE_NEXT_KEY,
	+ BCM_PARSE_VALUE_START,
	+ BCM_PARSE_VALUE
	+} bcm_parse_state;
	+
	+static int
	+bhnd_nvram_bcm_getvar_direct(struct bhnd_nvram_io io, const char name,
	+ void outp, size_t olen, bhnd_nvram_type otype)
	+{
	+ return (bhnd_nvram_bcm_getvar_direct_common(io, name, outp, olen, otype,
	+ true));
	+}
	+
	+/**
	+ * Common BCM/BCMRAW implementation of bhnd_nvram_getvar_direct().
	+ */
	+int
	+bhnd_nvram_bcm_getvar_direct_common(struct bhnd_nvram_io io, const char name,
	+ void outp, size_t olen, bhnd_nvram_type otype, bool have_header)
	+{
	+ struct bhnd_nvram_bcmhdr hdr;
	+ char buf[512];
	+ bcm_parse_state pstate;
	+ size_t limit, offset;
	+ size_t buflen, bufpos;
	+ size_t namelen, namepos;
	+ size_t vlen;
	+ int error;
	+
	+ limit = bhnd_nvram_io_getsize(io);
	+ offset = 0;
	+
	+ /* Fetch and validate the header */
	+ if (have_header) {
	+ if ((error = bhnd_nvram_io_read(io, offset, &hdr, sizeof(hdr))))
	+ return (error);
	+
	+ if (le32toh(hdr.magic) != BCM_NVRAM_MAGIC)
	+ return (ENXIO);
	+
	+ offset += sizeof(hdr);
	+ limit = bhnd_nv_ummin(le32toh(hdr.size), limit);
	+ }
	+
	+ /* Loop our parser until we find the requested variable, or hit EOF */
	+ pstate = BCM_PARSE_KEY_START;
	+ buflen = 0;
	+ bufpos = 0;
	+ namelen = strlen(name);
	+ namepos = 0;
	+ vlen = 0;
	+
	+ while ((offset - bufpos) < limit) {
	+ BHND_NV_ASSERT(bufpos <= buflen,
	+ ("buf position invalid (%zu > %zu)", bufpos, buflen));
	+ BHND_NV_ASSERT(buflen <= sizeof(buf),
	+ ("buf length invalid (%zu > %zu", buflen, sizeof(buf)));
	+
	+ /* Repopulate our parse buffer? */
	+ if (buflen - bufpos == 0) {
	+ BHND_NV_ASSERT(offset < limit, ("offset overrun"));
	+
	+ buflen = bhnd_nv_ummin(sizeof(buf), limit - offset);
	+ bufpos = 0;
	+
	+ error = bhnd_nvram_io_read(io, offset, buf, buflen);
	+ if (error)
	+ return (error);
	+
	+ offset += buflen;
	+ }
	+
	+ switch (pstate) {
	+ case BCM_PARSE_KEY_START:
	+ BHND_NV_ASSERT(buflen - bufpos > 0, ("empty buffer!"));
	+
	+ /* An extra '\0' denotes NVRAM EOF */
	+ if (buf[bufpos] == '\0')
	+ return (ENOENT);
	+
	+ /* Reset name matching position */
	+ namepos = 0;
	+
	+ /* Start name matching */
	+ pstate = BCM_PARSE_KEY_CONT;
	+ break;
	+
	+ case BCM_PARSE_KEY_CONT: {
	+ size_t navail, nleft;
	+
	+ nleft = namelen - namepos;
	+ navail = bhnd_nv_ummin(buflen - bufpos, nleft);
	+
	+ if (strncmp(name+namepos, buf+bufpos, navail) == 0) {
	+ /* Matched */
	+ namepos += navail;
	+ bufpos += navail;
	+
	+ /* If we've matched the full variable name,
	+ * look for its trailing delimiter */
	+ if (namepos == namelen)
	+ pstate = BCM_PARSE_KEY;
	+ } else {
	+ /* No match; advance to next entry and restart
	+ * name matching */
	+ pstate = BCM_PARSE_NEXT_KEY;
	+ }
	+
	+ break;
	+ }
	+
	+ case BCM_PARSE_KEY:
	+ BHND_NV_ASSERT(buflen - bufpos > 0, ("empty buffer!"));
	+
	+ if (buf[bufpos] == '=') {
	+ /* Key fully matched; advance past '=' and
	+ * parse the value */
	+ bufpos++;
	+ pstate = BCM_PARSE_VALUE_START;
	+ } else {
	+ /* No match; advance to next entry and restart
	+ * name matching */
	+ pstate = BCM_PARSE_NEXT_KEY;
	+ }
	+
	+ break;
	+
	+ case BCM_PARSE_NEXT_KEY: {
	+ const char *p;
	+
	+ /* Scan for a '\0' terminator */
	+ p = memchr(buf+bufpos, '\0', buflen - bufpos);
	+
	+ if (p != NULL) {
	+ /* Found entry terminator; restart name
	+ * matching at next entry */
	+ pstate = BCM_PARSE_KEY_START;
	+ bufpos = (p - buf) + 1 /* skip '\0' */;
	+ } else {
	+ /* Consumed full buffer looking for '\0';
	+ * force repopulation of the buffer and
	+ * retry */
	+ bufpos = buflen;
	+ }
	+
	+ break;
	+ }
	+
	+ case BCM_PARSE_VALUE_START: {
	+ const char *p;
	+
	+ /* Scan for a '\0' terminator */
	+ p = memchr(buf+bufpos, '\0', buflen - bufpos);
	+
	+ if (p != NULL) {
	+ /* Found entry terminator; parse the value */
	+ vlen = p - &buf[bufpos];
	+ pstate = BCM_PARSE_VALUE;
	+
	+ } else if (p == NULL && offset == limit) {
	+ /* Hit EOF without a terminating '\0';
	+ * treat the entry as implicitly terminated */
	+ vlen = buflen - bufpos;
	+ pstate = BCM_PARSE_VALUE;
	+
	+ } else if (p == NULL && bufpos > 0) {
	+ size_t nread;
	+
	+ /* Move existing value data to start of
	+ * buffer */
	+ memmove(buf, buf+bufpos, buflen - bufpos);
	+ buflen = bufpos;
	+ bufpos = 0;
	+
	+ /* Populate full buffer to allow retry of
	+ * value parsing */
	+ nread = bhnd_nv_ummin(sizeof(buf) - buflen,
	+ limit - offset);
	+
	+ error = bhnd_nvram_io_read(io, offset,
	+ buf+buflen, nread);
	+ if (error)
	+ return (error);
	+
	+ offset += nread;
	+ buflen += nread;
	+ } else {
	+ /* Value exceeds our buffer capacity */
	+ BHND_NV_LOG("cannot parse value for '%s' "
	+ "(exceeds %zu byte limit)\n", name,
	+ sizeof(buf));
	+
	+ return (ENXIO);
	+ }
	+
	+ break;
	+ }
	+
	+ case BCM_PARSE_VALUE:
	+ BHND_NV_ASSERT(vlen <= buflen, ("value buf overrun"));
	+
	+ return (bhnd_nvram_value_coerce(buf+bufpos, vlen,
	+ BHND_NVRAM_TYPE_STRING, outp, olen, otype));
	+ }
	+ }
	+
	+ /* Variable not found */
	+ return (ENOENT);
	+}
	+
	static int
	bhnd_nvram_bcm_serialize(bhnd_nvram_data_class cls, bhnd_nvram_plist props,
	bhnd_nvram_plist options, void outp, size_t *olen)
	Index: head/sys/dev/bhnd/nvram/bhnd_nvram_data_bcmraw.c
	===================================================================
	--- head/sys/dev/bhnd/nvram/bhnd_nvram_data_bcmraw.c
	+++ head/sys/dev/bhnd/nvram/bhnd_nvram_data_bcmraw.c
	@@ -50,6 +50,7 @@
	#include "bhnd_nvram_private.h"

	#include "bhnd_nvram_datavar.h"
	+#include "bhnd_nvram_data_bcmvar.h"

	/*
	* Broadcom-RAW NVRAM data class.
	@@ -133,6 +134,14 @@
	}

	static int
	+bhnd_nvram_bcmraw_getvar_direct(struct bhnd_nvram_io io, const char name,
	+ void buf, size_t len, bhnd_nvram_type type)
	+{
	+ return (bhnd_nvram_bcm_getvar_direct_common(io, name, buf, len, type,
	+ false));
	+}
	+
	+static int
	bhnd_nvram_bcmraw_serialize(bhnd_nvram_data_class cls, bhnd_nvram_plist props,
	bhnd_nvram_plist options, void outp, size_t *olen)
	{
	Index: head/sys/dev/bhnd/nvram/bhnd_nvram_data_bcmvar.h
	===================================================================
	--- head/sys/dev/bhnd/nvram/bhnd_nvram_data_bcmvar.h
	+++ head/sys/dev/bhnd/nvram/bhnd_nvram_data_bcmvar.h
	@@ -69,4 +69,8 @@
	uint32_t sdram_ncdl; /*< sdram_ncdl /
	} __packed;

	+int bhnd_nvram_bcm_getvar_direct_common(struct bhnd_nvram_io *io,
	+ const char name, void outp, size_t *olen, bhnd_nvram_type otype,
	+ bool have_header);
	+
	#endif /* _BHND_NVRAM_BHND_NVRAM_BCMVAR_H_ */
	Index: head/sys/dev/bhnd/nvram/bhnd_nvram_data_btxt.c
	===================================================================
	--- head/sys/dev/bhnd/nvram/bhnd_nvram_data_btxt.c
	+++ head/sys/dev/bhnd/nvram/bhnd_nvram_data_btxt.c
	@@ -124,6 +124,226 @@
	return (BHND_NVRAM_DATA_PROBE_MAYBE);
	}

	+
	+/**
	+ * Parser states for bhnd_nvram_bcm_getvar_direct_common().
	+ */
	+typedef enum {
	+ BTXT_PARSE_LINE_START,
	+ BTXT_PARSE_KEY,
	+ BTXT_PARSE_KEY_END,
	+ BTXT_PARSE_NEXT_LINE,
	+ BTXT_PARSE_VALUE_START,
	+ BTXT_PARSE_VALUE
	+} btxt_parse_state;
	+
	+static int
	+bhnd_nvram_btxt_getvar_direct(struct bhnd_nvram_io io, const char name,
	+ void outp, size_t olen, bhnd_nvram_type otype)
	+{
	+ char buf[512];
	+ btxt_parse_state pstate;
	+ size_t limit, offset;
	+ size_t buflen, bufpos;
	+ size_t namelen, namepos;
	+ size_t vlen;
	+ int error;
	+
	+ limit = bhnd_nvram_io_getsize(io);
	+ offset = 0;
	+
	+ /* Loop our parser until we find the requested variable, or hit EOF */
	+ pstate = BTXT_PARSE_LINE_START;
	+ buflen = 0;
	+ bufpos = 0;
	+ namelen = strlen(name);
	+ namepos = 0;
	+ vlen = 0;
	+
	+ while ((offset - bufpos) < limit) {
	+ BHND_NV_ASSERT(bufpos <= buflen,
	+ ("buf position invalid (%zu > %zu)", bufpos, buflen));
	+ BHND_NV_ASSERT(buflen <= sizeof(buf),
	+ ("buf length invalid (%zu > %zu", buflen, sizeof(buf)));
	+
	+ /* Repopulate our parse buffer? */
	+ if (buflen - bufpos == 0) {
	+ BHND_NV_ASSERT(offset < limit, ("offset overrun"));
	+
	+ buflen = bhnd_nv_ummin(sizeof(buf), limit - offset);
	+ bufpos = 0;
	+
	+ error = bhnd_nvram_io_read(io, offset, buf, buflen);
	+ if (error)
	+ return (error);
	+
	+ offset += buflen;
	+ }
	+
	+ switch (pstate) {
	+ case BTXT_PARSE_LINE_START:
	+ BHND_NV_ASSERT(bufpos < buflen, ("empty buffer!"));
	+
	+ /* Reset name matching position */
	+ namepos = 0;
	+
	+ /* Trim any leading whitespace */
	+ while (bufpos < buflen && bhnd_nv_isspace(buf[bufpos]))
	+ {
	+ bufpos++;
	+ }
	+
	+ if (bufpos == buflen) {
	+ /* Continue parsing the line */
	+ pstate = BTXT_PARSE_LINE_START;
	+ } else if (bufpos < buflen && buf[bufpos] == '#') {
	+ /* Comment; skip to next line */
	+ pstate = BTXT_PARSE_NEXT_LINE;
	+ } else {
	+ /* Start name matching */
	+ pstate = BTXT_PARSE_KEY;
	+ }
	+
	+
	+ break;
	+
	+ case BTXT_PARSE_KEY: {
	+ size_t navail, nleft;
	+
	+ nleft = namelen - namepos;
	+ navail = bhnd_nv_ummin(buflen - bufpos, nleft);
	+
	+ if (strncmp(name+namepos, buf+bufpos, navail) == 0) {
	+ /* Matched */
	+ namepos += navail;
	+ bufpos += navail;
	+
	+ if (namepos == namelen) {
	+ /* Matched the full variable; look for
	+ * its trailing delimiter */
	+ pstate = BTXT_PARSE_KEY_END;
	+ } else {
	+ /* Continue matching the name */
	+ pstate = BTXT_PARSE_KEY;
	+ }
	+ } else {
	+ /* No match; advance to next entry and restart
	+ * name matching */
	+ pstate = BTXT_PARSE_NEXT_LINE;
	+ }
	+
	+ break;
	+ }
	+
	+ case BTXT_PARSE_KEY_END:
	+ BHND_NV_ASSERT(bufpos < buflen, ("empty buffer!"));
	+
	+ if (buf[bufpos] == '=') {
	+ /* Key fully matched; advance past '=' and
	+ * parse the value */
	+ bufpos++;
	+ pstate = BTXT_PARSE_VALUE_START;
	+ } else {
	+ /* No match; advance to next line and restart
	+ * name matching */
	+ pstate = BTXT_PARSE_NEXT_LINE;
	+ }
	+
	+ break;
	+
	+ case BTXT_PARSE_NEXT_LINE: {
	+ const char *p;
	+
	+ /* Scan for a '\r', '\n', or '\r\n' terminator */
	+ p = memchr(buf+bufpos, '\n', buflen - bufpos);
	+ if (p == NULL)
	+ p = memchr(buf+bufpos, '\r', buflen - bufpos);
	+
	+ if (p != NULL) {
	+ /* Found entry terminator; restart name
	+ * matching at next line */
	+ pstate = BTXT_PARSE_LINE_START;
	+ bufpos = (p - buf);
	+ } else {
	+ /* Consumed full buffer looking for newline;
	+ * force repopulation of the buffer and
	+ * retry */
	+ pstate = BTXT_PARSE_NEXT_LINE;
	+ bufpos = buflen;
	+ }
	+
	+ break;
	+ }
	+
	+ case BTXT_PARSE_VALUE_START: {
	+ const char *p;
	+
	+ /* Scan for a terminating newline */
	+ p = memchr(buf+bufpos, '\n', buflen - bufpos);
	+ if (p == NULL)
	+ p = memchr(buf+bufpos, '\r', buflen - bufpos);
	+
	+ if (p != NULL) {
	+ /* Found entry terminator; parse the value */
	+ vlen = p - &buf[bufpos];
	+ pstate = BTXT_PARSE_VALUE;
	+
	+ } else if (p == NULL && offset == limit) {
	+ /* Hit EOF without a terminating newline;
	+ * treat the entry as implicitly terminated */
	+ vlen = buflen - bufpos;
	+ pstate = BTXT_PARSE_VALUE;
	+
	+ } else if (p == NULL && bufpos > 0) {
	+ size_t nread;
	+
	+ /* Move existing value data to start of
	+ * buffer */
	+ memmove(buf, buf+bufpos, buflen - bufpos);
	+ buflen = bufpos;
	+ bufpos = 0;
	+
	+ /* Populate full buffer to allow retry of
	+ * value parsing */
	+ nread = bhnd_nv_ummin(sizeof(buf) - buflen,
	+ limit - offset);
	+
	+ error = bhnd_nvram_io_read(io, offset,
	+ buf+buflen, nread);
	+ if (error)
	+ return (error);
	+
	+ offset += nread;
	+ buflen += nread;
	+ } else {
	+ /* Value exceeds our buffer capacity */
	+ BHND_NV_LOG("cannot parse value for '%s' "
	+ "(exceeds %zu byte limit)\n", name,
	+ sizeof(buf));
	+
	+ return (ENXIO);
	+ }
	+
	+ break;
	+ }
	+
	+ case BTXT_PARSE_VALUE:
	+ BHND_NV_ASSERT(vlen <= buflen, ("value buf overrun"));
	+
	+ /* Trim any trailing whitespace */
	+ while (vlen > 0 && bhnd_nv_isspace(buf[bufpos+vlen-1]))
	+ vlen--;
	+
	+ /* Write the value to the caller's buffer */
	+ return (bhnd_nvram_value_coerce(buf+bufpos, vlen,
	+ BHND_NVRAM_TYPE_STRING, outp, olen, otype));
	+ }
	+ }
	+
	+ /* Variable not found */
	+ return (ENOENT);
	+}
	+
	static int
	bhnd_nvram_btxt_serialize(bhnd_nvram_data_class cls, bhnd_nvram_plist props,
	bhnd_nvram_plist options, void outp, size_t *olen)
	Index: head/sys/dev/bhnd/nvram/bhnd_nvram_data_sprom.c
	===================================================================
	--- head/sys/dev/bhnd/nvram/bhnd_nvram_data_sprom.c
	+++ head/sys/dev/bhnd/nvram/bhnd_nvram_data_sprom.c
	@@ -68,8 +68,7 @@

	static int bhnd_nvram_sprom_ident(
	struct bhnd_nvram_io *io,
	- const bhnd_sprom_layout **ident,
	- struct bhnd_nvram_io **shadow);
	+ const bhnd_sprom_layout **ident);

	static int bhnd_nvram_sprom_write_var(
	bhnd_sprom_opcode_state *state,
	@@ -77,6 +76,13 @@
	bhnd_nvram_val *value,
	struct bhnd_nvram_io *io);

	+static int bhnd_nvram_sprom_read_var(
	+ struct bhnd_sprom_opcode_state *state,
	+ struct bhnd_sprom_opcode_idx_entry *entry,
	+ struct bhnd_nvram_io *io,
	+ union bhnd_nvram_sprom_storage *storage,
	+ bhnd_nvram_val *val);
	+
	static int bhnd_nvram_sprom_write_offset(
	const struct bhnd_nvram_vardefn *var,
	struct bhnd_nvram_io *data,
	@@ -153,10 +159,6 @@
	*
	* @param io An I/O context mapping the SPROM data to be identified.
	* @param[out] ident On success, the identified SPROM layout.
	- * @param[out] shadow On success, a correctly sized iobuf instance mapping
	- * a copy of the identified SPROM image. The caller is
	- * responsible for deallocating this instance via
	- * bhnd_nvram_io_free()
	*
	* @retval 0 success
	* @retval non-zero If identifying @p io otherwise fails, a regular unix
	@@ -164,77 +166,69 @@
	*/
	static int
	bhnd_nvram_sprom_ident(struct bhnd_nvram_io *io,
	- const bhnd_sprom_layout ident, struct bhnd_nvram_io shadow)
	+ const bhnd_sprom_layout **ident)
	{
	- struct bhnd_nvram_io *buf;
	- uint8_t crc;
	- size_t crc_errors;
	- size_t sprom_sz_max;
	- int error;
	+ uint8_t crc;
	+ size_t crc_errors;
	+ size_t nbytes;
	+ int error;

	- /* Find the largest SPROM layout size */
	- sprom_sz_max = 0;
	- for (size_t i = 0; i < bhnd_sprom_num_layouts; i++) {
	- sprom_sz_max = bhnd_nv_ummax(sprom_sz_max,
	- bhnd_sprom_layouts[i].size);
	- }
	-
	- /* Allocate backing buffer and initialize CRC state */
	- buf = bhnd_nvram_iobuf_empty(0, sprom_sz_max);
	crc = BHND_NVRAM_CRC8_INITIAL;
	crc_errors = 0;
	+ nbytes = 0;

	/* We iterate the SPROM layouts smallest to largest, allowing us to
	* perform incremental checksum calculation */
	for (size_t i = 0; i < bhnd_sprom_num_layouts; i++) {
	const bhnd_sprom_layout *layout;
	- void *ptr;
	- size_t nbytes, nr;
	+ u_char buf[512];
	+ size_t nread;
	uint16_t magic;
	uint8_t srev;
	bool crc_valid;
	bool have_magic;

	layout = &bhnd_sprom_layouts[i];
	- nbytes = bhnd_nvram_io_getsize(buf);

	- if ((layout->flags & SPROM_LAYOUT_MAGIC_NONE)) {
	+ have_magic = true;
	+ if ((layout->flags & SPROM_LAYOUT_MAGIC_NONE))
	have_magic = false;
	- } else {
	- have_magic = true;
	- }

	- /* Layout instances must be ordered from smallest to largest by
	- * the nvram_map compiler */
	+ /*
	+ * Read image data and update CRC (errors are reported
	+ * after the signature check)
	+ *
	+ * Layout instances must be ordered from smallest to largest by
	+ * the nvram_map compiler, allowing us to incrementally update
	+ * our CRC.
	+ */
	if (nbytes > layout->size)
	- BHND_NV_PANIC("SPROM layout is defined out-of-order");
	+ BHND_NV_PANIC("SPROM layout defined out-of-order");

	- /* Calculate number of additional bytes to be read */
	- nr = layout->size - nbytes;
	+ nread = layout->size - nbytes;

	- /* Adjust the buffer size and fetch a write pointer */
	- if ((error = bhnd_nvram_io_setsize(buf, layout->size)))
	- goto failed;
	+ while (nread > 0) {
	+ size_t nr;

	- error = bhnd_nvram_io_write_ptr(buf, nbytes, &ptr, nr, NULL);
	- if (error)
	- goto failed;
	+ nr = bhnd_nv_ummin(nread, sizeof(buf));
	+
	+ if ((error = bhnd_nvram_io_read(io, nbytes, buf, nr)))
	+ return (error);
	+
	+ crc = bhnd_nvram_crc8(buf, nr, crc);
	+ crc_valid = (crc == BHND_NVRAM_CRC8_VALID);
	+ if (!crc_valid)
	+ crc_errors++;

	- /* Read image data and update CRC (errors are reported
	- * after the signature check) */
	- if ((error = bhnd_nvram_io_read(io, nbytes, ptr, nr)))
	- goto failed;
	-
	- crc = bhnd_nvram_crc8(ptr, nr, crc);
	- crc_valid = (crc == BHND_NVRAM_CRC8_VALID);
	- if (!crc_valid)
	- crc_errors++;
	+ nread -= nr;
	+ nbytes += nr;
	+ }

	- /* Fetch SPROM revision */
	- error = bhnd_nvram_io_read(buf, layout->srev_offset, &srev,
	+ /* Read SPROM revision */
	+ error = bhnd_nvram_io_read(io, layout->srev_offset, &srev,
	sizeof(srev));
	if (error)
	- goto failed;
	+ return (error);

	/* Early sromrev 1 devices (specifically some BCM440x enet
	* cards) are reported to have been incorrectly programmed
	@@ -248,7 +242,7 @@

	/* Check the magic value, skipping to the next layout on
	* failure. */
	- error = bhnd_nvram_sprom_check_magic(buf, layout, &magic);
	+ error = bhnd_nvram_sprom_check_magic(io, layout, &magic);
	if (error) {
	/* If the CRC is was valid, log the mismatch */
	if (crc_valid \|\| BHND_NV_VERBOSE) {
	@@ -256,8 +250,7 @@
	"0x%hx (expected 0x%hx)\n", srev,
	magic, layout->magic_value);

	- error = ENXIO;
	- goto failed;
	+ return (ENXIO);
	}

	continue;
	@@ -277,40 +270,93 @@
	}

	/* Identified */
	- *shadow = buf;
	*ident = layout;
	return (0);
	}

	- /* No match -- set error and fallthrough */
	- error = ENXIO;
	+ /* No match */
	if (crc_errors > 0 && BHND_NV_VERBOSE) {
	BHND_NV_LOG("sprom parsing failed with %zu CRC errors\n",
	crc_errors);
	}

	-failed:
	- bhnd_nvram_io_free(buf);
	- return (error);
	+ return (ENXIO);
	}

	static int
	bhnd_nvram_sprom_probe(struct bhnd_nvram_io *io)
	{
	const bhnd_sprom_layout *layout;
	- struct bhnd_nvram_io *shadow;
	int error;

	/* Try to parse the input */
	- if ((error = bhnd_nvram_sprom_ident(io, &layout, &shadow)))
	+ if ((error = bhnd_nvram_sprom_ident(io, &layout)))
	return (error);

	- /* Clean up the shadow iobuf */
	- bhnd_nvram_io_free(shadow);
	-
	return (BHND_NVRAM_DATA_PROBE_DEFAULT);
	}

	+static int
	+bhnd_nvram_sprom_getvar_direct(struct bhnd_nvram_io io, const char name,
	+ void buf, size_t len, bhnd_nvram_type type)
	+{
	+ const bhnd_sprom_layout *layout;
	+ bhnd_sprom_opcode_state state;
	+ const struct bhnd_nvram_vardefn *var;
	+ size_t vid;
	+ int error;
	+
	+ /* Look up the variable definition and ID */
	+ if ((var = bhnd_nvram_find_vardefn(name)) == NULL)
	+ return (ENOENT);
	+
	+ vid = bhnd_nvram_get_vardefn_id(var);
	+
	+ /* Identify the SPROM image layout */
	+ if ((error = bhnd_nvram_sprom_ident(io, &layout)))
	+ return (error);
	+
	+ /* Initialize SPROM layout interpreter */
	+ if ((error = bhnd_sprom_opcode_init(&state, layout))) {
	+ BHND_NV_LOG("error initializing opcode state: %d\n", error);
	+ return (ENXIO);
	+ }
	+
	+ /* Find SPROM layout entry for the requested variable */
	+ while ((error = bhnd_sprom_opcode_next_var(&state)) == 0) {
	+ bhnd_sprom_opcode_idx_entry entry;
	+ union bhnd_nvram_sprom_storage storage;
	+ bhnd_nvram_val val;
	+
	+ /* Fetch the variable's entry state */
	+ if ((error = bhnd_sprom_opcode_init_entry(&state, &entry)))
	+ return (error);
	+
	+ /* Match against expected VID */
	+ if (entry.vid != vid)
	+ continue;
	+
	+ /* Decode variable to a new value instance */
	+ error = bhnd_nvram_sprom_read_var(&state, &entry, io, &storage,
	+ &val);
	+ if (error)
	+ return (error);
	+
	+ /* Perform value coercion */
	+ error = bhnd_nvram_val_encode(&val, buf, len, type);
	+
	+ /* Clean up */
	+ bhnd_nvram_val_release(&val);
	+ return (error);
	+ }
	+
	+ /* Hit EOF without matching the requested variable? */
	+ if (error == ENOENT)
	+ return (ENOENT);
	+
	+ /* Some other parse error occured */
	+ return (error);
	+}

	/**
	* Return the SPROM layout definition for the given @p sromrev, or NULL if
	@@ -365,7 +411,7 @@
	var_base_type = bhnd_nvram_base_type(var->type);

	/* Fetch the element count from the SPROM variable layout definition */
	- if ((error = bhnd_sprom_opcode_parse_var(state, entry)))
	+ if ((error = bhnd_sprom_opcode_eval_var(state, entry)))
	return (error);

	nelem = state->var.nelem;
	@@ -717,7 +763,12 @@
	sp = (struct bhnd_nvram_sprom *)nv;

	/* Identify the SPROM input data */
	- if ((error = bhnd_nvram_sprom_ident(io, &sp->layout, &sp->data)))
	+ if ((error = bhnd_nvram_sprom_ident(io, &sp->layout)))
	+ return (error);
	+
	+ /* Copy SPROM image to our shadow buffer */
	+ sp->data = bhnd_nvram_iobuf_copy_range(io, 0, sp->layout->size);
	+ if (sp->data == NULL)
	goto failed;

	/* Initialize SPROM binding eval state */
	@@ -989,9 +1040,15 @@
	}

	/**
	- * Common variable decoding; fetches and decodes variable to @p val,
	- * using @p storage for actual data storage.
	+ * Read a SPROM variable value from @p io.
	*
	+ * @param state The SPROM opcode state describing the layout of @p io.
	+ * @param entry The variable's SPROM opcode index entry.
	+ * @param io The input I/O context.
	+ * @param storage Storage to be used with @p val.
	+ * @param[out] val Value instance to be initialized with the
	+ * parsed variable data.
	+ *
	* The returned @p val instance will hold a borrowed reference to @p storage,
	* and must be copied via bhnd_nvram_val_copy() if it will be referenced beyond
	* the lifetime of @p storage.
	@@ -1000,13 +1057,12 @@
	* via bhnd_nvram_val_release().
	*/
	static int
	-bhnd_nvram_sprom_getvar_common(struct bhnd_nvram_data nv, void cookiep,
	+bhnd_nvram_sprom_read_var(struct bhnd_sprom_opcode_state *state,
	+ struct bhnd_sprom_opcode_idx_entry entry, struct bhnd_nvram_io io,
	union bhnd_nvram_sprom_storage storage, bhnd_nvram_val val)
	{
	- struct bhnd_nvram_sprom *sp;
	- bhnd_sprom_opcode_idx_entry *entry;
	- const struct bhnd_nvram_vardefn *var;
	union bhnd_nvram_sprom_storage *inp;
	+ const struct bhnd_nvram_vardefn *var;
	bhnd_nvram_type var_btype;
	uint32_t intv;
	size_t ilen, ipos, iwidth;
	@@ -1014,14 +1070,9 @@
	bool all_bits_set;
	int error;

	- sp = (struct bhnd_nvram_sprom *)nv;
	- entry = cookiep;
	-
	- BHND_NV_ASSERT(cookiep != NULL, ("NULL variable cookiep"));
	-
	/* Fetch canonical variable definition */
	- var = SPROM_COOKIE_TO_NVRAM_VAR(cookiep);
	- BHND_NV_ASSERT(var != NULL, ("invalid cookiep %p", cookiep));
	+ var = bhnd_nvram_get_vardefn(entry->vid);
	+ BHND_NV_ASSERT(var != NULL, ("invalid entry"));

	/*
	* Fetch the array length from the SPROM variable definition.
	@@ -1030,12 +1081,12 @@
	* canonical NVRAM variable definition, but some SPROM layouts may
	* define a smaller element count.
	*/
	- if ((error = bhnd_sprom_opcode_parse_var(&sp->state, entry))) {
	+ if ((error = bhnd_sprom_opcode_eval_var(state, entry))) {
	BHND_NV_LOG("variable evaluation failed: %d\n", error);
	return (error);
	}

	- nelem = sp->state.var.nelem;
	+ nelem = state->var.nelem;
	if (nelem > var->nelem) {
	BHND_NV_LOG("SPROM array element count %zu cannot be "
	"represented by '%s' element count of %hhu\n", nelem,
	@@ -1070,7 +1121,7 @@
	/*
	* Decode the SPROM data, iteratively decoding up to nelem values.
	*/
	- if ((error = bhnd_sprom_opcode_seek(&sp->state, entry))) {
	+ if ((error = bhnd_sprom_opcode_seek(state, entry))) {
	BHND_NV_LOG("variable seek failed: %d\n", error);
	return (error);
	}
	@@ -1081,7 +1132,7 @@
	all_bits_set = true;
	else
	all_bits_set = false;
	- while ((error = bhnd_sprom_opcode_next_binding(&sp->state)) == 0) {
	+ while ((error = bhnd_sprom_opcode_next_binding(state)) == 0) {
	bhnd_sprom_opcode_bind *binding;
	bhnd_sprom_opcode_var *binding_var;
	bhnd_nvram_type intv_type;
	@@ -1091,12 +1142,12 @@
	void *ptr;

	BHND_NV_ASSERT(
	- sp->state.var_state >= SPROM_OPCODE_VAR_STATE_OPEN,
	+ state->var_state >= SPROM_OPCODE_VAR_STATE_OPEN,
	("invalid var state"));
	- BHND_NV_ASSERT(sp->state.var.have_bind, ("invalid bind state"));
	+ BHND_NV_ASSERT(state->var.have_bind, ("invalid bind state"));

	- binding_var = &sp->state.var;
	- binding = &sp->state.var.bind;
	+ binding_var = &state->var;
	+ binding = &state->var.bind;

	if (ipos >= nelem) {
	BHND_NV_LOG("output skip %u positioned "
	@@ -1107,17 +1158,16 @@

	/* Calculate input skip bytes for this binding */
	skip_in_bytes = binding->skip_in;
	- error = bhnd_sprom_opcode_apply_scale(&sp->state,
	- &skip_in_bytes);
	+ error = bhnd_sprom_opcode_apply_scale(state, &skip_in_bytes);
	if (error)
	return (error);

	/* Bind */
	- offset = sp->state.offset;
	+ offset = state->offset;
	for (size_t i = 0; i < binding->count; i++) {
	/* Read the offset value, OR'ing with the current
	* value of intv */
	- error = bhnd_nvram_sprom_read_offset(var, sp->data,
	+ error = bhnd_nvram_sprom_read_offset(var, io,
	binding_var->base_type,
	offset,
	binding_var->mask,
	@@ -1209,6 +1259,39 @@
	return (error);
	}

	+
	+/**
	+ * Common variable decoding; fetches and decodes variable to @p val,
	+ * using @p storage for actual data storage.
	+ *
	+ * The returned @p val instance will hold a borrowed reference to @p storage,
	+ * and must be copied via bhnd_nvram_val_copy() if it will be referenced beyond
	+ * the lifetime of @p storage.
	+ *
	+ * The caller is responsible for releasing any allocated value state
	+ * via bhnd_nvram_val_release().
	+ */
	+static int
	+bhnd_nvram_sprom_getvar_common(struct bhnd_nvram_data nv, void cookiep,
	+ union bhnd_nvram_sprom_storage storage, bhnd_nvram_val val)
	+{
	+ struct bhnd_nvram_sprom *sp;
	+ bhnd_sprom_opcode_idx_entry *entry;
	+ const struct bhnd_nvram_vardefn *var;
	+
	+ BHND_NV_ASSERT(cookiep != NULL, ("NULL variable cookiep"));
	+
	+ sp = (struct bhnd_nvram_sprom *)nv;
	+ entry = cookiep;
	+
	+ /* Fetch canonical variable definition */
	+ var = SPROM_COOKIE_TO_NVRAM_VAR(cookiep);
	+ BHND_NV_ASSERT(var != NULL, ("invalid cookiep %p", cookiep));
	+
	+ return (bhnd_nvram_sprom_read_var(&sp->state, entry, sp->data, storage,
	+ val));
	+}
	+
	static int
	bhnd_nvram_sprom_getvar_order(struct bhnd_nvram_data nv, void cookiep1,
	void *cookiep2)
	Index: head/sys/dev/bhnd/nvram/bhnd_nvram_data_sprom_subr.c
	===================================================================
	--- head/sys/dev/bhnd/nvram/bhnd_nvram_data_sprom_subr.c
	+++ head/sys/dev/bhnd/nvram/bhnd_nvram_data_sprom_subr.c
	@@ -51,7 +51,6 @@
	const void *rhs);

	static int bhnd_sprom_opcode_reset(bhnd_sprom_opcode_state *state);
	-static int bhnd_sprom_opcode_next_var(bhnd_sprom_opcode_state *state);

	static int bhnd_sprom_opcode_set_type(bhnd_sprom_opcode_state *state,
	bhnd_nvram_type type);
	@@ -108,8 +107,6 @@
	return (ENOMEM);

	for (num_vars = 0; num_vars < num_idx; num_vars++) {
	- size_t opcodes;
	-
	/* Seek to next entry */
	if ((error = bhnd_sprom_opcode_next_var(state))) {
	SPROM_OP_BAD(state, "error reading expected variable "
	@@ -118,36 +115,14 @@
	return (error);
	}

	- /* We limit the SPROM index representations to the minimal
	- * type widths capable of covering all known layouts */
	-
	- /* Save SPROM image offset */
	- if (state->offset > UINT16_MAX) {
	- SPROM_OP_BAD(state, "cannot index large offset %u\n",
	- state->offset);
	- bhnd_nv_free(idx);
	- return (ENXIO);
	- }
	- idx[num_vars].offset = state->offset;
	-
	- /* Save current variable ID */
	- if (state->vid > UINT16_MAX) {
	- SPROM_OP_BAD(state, "cannot index large vid %zu\n",
	- state->vid);
	- bhnd_nv_free(idx);
	- return (ENXIO);
	- }
	- idx[num_vars].vid = state->vid;
	-
	- /* Save opcode position */
	- opcodes = (state->input - state->layout->bindings);
	- if (opcodes > UINT16_MAX) {
	- SPROM_OP_BAD(state, "cannot index large opcode offset "
	- "%zu\n", opcodes);
	+ /* Record entry state in our index */
	+ error = bhnd_sprom_opcode_init_entry(state, &idx[num_vars]);
	+ if (error) {
	+ SPROM_OP_BAD(state, "error initializing index for "
	+ "entry: %d\n", error);
	bhnd_nv_free(idx);
	- return (ENXIO);
	+ return (error);
	}
	- idx[num_vars].opcodes = opcodes;
	}

	/* Should have reached end of binding table; next read must return
	@@ -314,6 +289,54 @@
	return (&state->idx[idxpos]);
	}

	+
	+/**
	+ * Initialize @p entry with the current variable's opcode state.
	+ *
	+ * @param state The opcode state to be saved.
	+ * @param[out] entry The opcode index entry to be initialized from @p state.
	+ *
	+ * @retval 0 success
	+ * @retval ENXIO if @p state cannot be serialized as an index entry.
	+ */
	+int
	+bhnd_sprom_opcode_init_entry(bhnd_sprom_opcode_state *state,
	+ bhnd_sprom_opcode_idx_entry *entry)
	+{
	+ size_t opcodes;
	+
	+ /* We limit the SPROM index representations to the minimal type widths
	+ * capable of covering all known layouts */
	+
	+ /* Save SPROM image offset */
	+ if (state->offset > UINT16_MAX) {
	+ SPROM_OP_BAD(state, "cannot index large offset %u\n",
	+ state->offset);
	+ return (ENXIO);
	+ }
	+
	+ entry->offset = state->offset;
	+
	+ /* Save current variable ID */
	+ if (state->vid > UINT16_MAX) {
	+ SPROM_OP_BAD(state, "cannot index large vid %zu\n",
	+ state->vid);
	+ return (ENXIO);
	+ }
	+ entry->vid = state->vid;
	+
	+ /* Save opcode position */
	+ opcodes = (state->input - state->layout->bindings);
	+ if (opcodes > UINT16_MAX) {
	+ SPROM_OP_BAD(state, "cannot index large opcode offset "
	+ "%zu\n", opcodes);
	+ return (ENXIO);
	+ }
	+ entry->opcodes = opcodes;
	+
	+ return (0);
	+}
	+
	/**
	* Reset SPROM opcode evaluation state and seek to the @p entry's position.
	*
	@@ -1255,7 +1278,7 @@
	* returned.
	*/
	int
	-bhnd_sprom_opcode_parse_var(bhnd_sprom_opcode_state *state,
	+bhnd_sprom_opcode_eval_var(bhnd_sprom_opcode_state *state,
	bhnd_sprom_opcode_idx_entry *entry)
	{
	uint8_t opcode;
	@@ -1291,7 +1314,7 @@
	* @retval non-zero if evaluation otherwise fails, a regular unix error
	* code will be returned.
	*/
	-static int
	+int
	bhnd_sprom_opcode_next_var(bhnd_sprom_opcode_state *state)
	{
	uint8_t opcode;
	Index: head/sys/dev/bhnd/nvram/bhnd_nvram_data_spromvar.h
	===================================================================
	--- head/sys/dev/bhnd/nvram/bhnd_nvram_data_spromvar.h
	+++ head/sys/dev/bhnd/nvram/bhnd_nvram_data_spromvar.h
	@@ -64,13 +64,19 @@
	bhnd_sprom_opcode_state *state,
	bhnd_sprom_opcode_idx_entry *prev);

	-int bhnd_sprom_opcode_parse_var(
	+int bhnd_sprom_opcode_init_entry(
	+ bhnd_sprom_opcode_state *state,
	+ bhnd_sprom_opcode_idx_entry *entry);
	+
	+int bhnd_sprom_opcode_eval_var(
	bhnd_sprom_opcode_state *state,
	bhnd_sprom_opcode_idx_entry *entry);

	int bhnd_sprom_opcode_seek(
	bhnd_sprom_opcode_state *state,
	bhnd_sprom_opcode_idx_entry *entry);
	+int bhnd_sprom_opcode_next_var(
	+ bhnd_sprom_opcode_state *state);
	int bhnd_sprom_opcode_next_binding(
	bhnd_sprom_opcode_state *state);
	int bhnd_sprom_opcode_apply_scale(
	Index: head/sys/dev/bhnd/nvram/bhnd_nvram_data_tlv.c
	===================================================================
	--- head/sys/dev/bhnd/nvram/bhnd_nvram_data_tlv.c
	+++ head/sys/dev/bhnd/nvram/bhnd_nvram_data_tlv.c
	@@ -165,6 +165,78 @@
	}

	static int
	+bhnd_nvram_tlv_getvar_direct(struct bhnd_nvram_io io, const char name,
	+ void buf, size_t len, bhnd_nvram_type type)
	+{
	+ struct bhnd_nvram_tlv_env env;
	+ char data[NVRAM_TLV_ENVP_DATA_MAX_LEN];
	+ size_t data_len;
	+ const char key, value;
	+ size_t keylen, vlen;
	+ size_t namelen;
	+ size_t next, off;
	+ uint8_t tag;
	+ int error;
	+
	+ namelen = strlen(name);
	+
	+ /* Iterate over the input looking for the requested variable */
	+ next = 0;
	+ while (!(error = bhnd_nvram_tlv_next_record(io, &next, &off, &tag))) {
	+ switch (tag) {
	+ case NVRAM_TLV_TYPE_END:
	+ /* Not found */
	+ return (ENOENT);
	+
	+ case NVRAM_TLV_TYPE_ENV:
	+ /* Read the record header */
	+ error = bhnd_nvram_io_read(io, off, &env, sizeof(env));
	+ if (error) {
	+ BHND_NV_LOG("error reading TLV_ENV record "
	+ "header: %d\n", error);
	+ return (error);
	+ }
	+
	+ /* Read the record data */
	+ data_len = NVRAM_TLV_ENVP_DATA_LEN(&env);
	+ error = bhnd_nvram_io_read(io, off + sizeof(env), data,
	+ data_len);
	+ if (error) {
	+ BHND_NV_LOG("error reading TLV_ENV record "
	+ "data: %d\n", error);
	+ return (error);
	+ }
	+
	+ /* Parse the key=value string */
	+ error = bhnd_nvram_parse_env(data, data_len, '=', &key,
	+ &keylen, &value, &vlen);
	+ if (error) {
	+ BHND_NV_LOG("error parsing TLV_ENV data: %d\n",
	+ error);
	+ return (error);
	+ }
	+
	+ /* Match against requested variable name */
	+ if (keylen == namelen &&
	+ strncmp(key, name, namelen) == 0)
	+ {
	+ return (bhnd_nvram_value_coerce(value, vlen,
	+ BHND_NVRAM_TYPE_STRING, buf, len, type));
	+ }
	+
	+ break;
	+
	+ default:
	+ /* Skip unknown tags */
	+ break;
	+ }
	+ }
	+
	+ /* Hit I/O error */
	+ return (error);
	+}
	+
	+static int
	bhnd_nvram_tlv_serialize(bhnd_nvram_data_class cls, bhnd_nvram_plist props,
	bhnd_nvram_plist options, void outp, size_t *olen)
	{
	Index: head/sys/dev/bhnd/nvram/bhnd_nvram_datavar.h
	===================================================================
	--- head/sys/dev/bhnd/nvram/bhnd_nvram_datavar.h
	+++ head/sys/dev/bhnd/nvram/bhnd_nvram_datavar.h
	@@ -55,6 +55,11 @@
	/** @see bhnd_nvram_data_probe() */
	typedef int (bhnd_nvram_data_op_probe)(struct bhnd_nvram_io *io);

	+/** @see bhnd_nvram_data_probe() */
	+typedef int (bhnd_nvram_data_op_getvar_direct)(
	+ struct bhnd_nvram_io io, const char name,
	+ void outp, size_t olen, bhnd_nvram_type otype);
	+
	/** @see bhnd_nvram_data_serialize() */
	typedef int (bhnd_nvram_data_op_serialize)(
	bhnd_nvram_data_class *cls,
	@@ -131,6 +136,7 @@
	size_t size; /*< instance size /

	bhnd_nvram_data_op_probe *op_probe;
	+ bhnd_nvram_data_op_getvar_direct *op_getvar_direct;
	bhnd_nvram_data_op_serialize *op_serialize;
	bhnd_nvram_data_op_new *op_new;
	bhnd_nvram_data_op_free *op_free;
	@@ -184,6 +190,7 @@
	*/
	#define BHND_NVRAM_DATA_CLASS_ITER_METHODS(_cname, _macro) \
	_macro(_cname, probe) \
	+ _macro(_cname, getvar_direct) \
	_macro(_cname, serialize) \
	_macro(_cname, new) \
	_macro(_cname, free) \
	Index: head/sys/dev/bhnd/nvram/bhnd_sprom.c
	===================================================================
	--- head/sys/dev/bhnd/nvram/bhnd_sprom.c
	+++ head/sys/dev/bhnd/nvram/bhnd_sprom.c
	@@ -120,9 +120,9 @@

	sprom_size = r_size - offset;

	- /* Allocate an I/O context for the SPROM parser. All SPROM reads
	- * must be 16-bit aligned */
	- io = bhnd_nvram_iores_new(r, offset, sprom_size, sizeof(uint16_t));
	+ /* Allocate an I/O context for the SPROM parser. SPROM reads do not
	+ * appear to require any specific alignment. */
	+ io = bhnd_nvram_iores_new(r, offset, sprom_size, 1);
	if (io == NULL) {
	error = ENXIO;
	goto failed;
	Index: head/sys/mips/broadcom/bcm_machdep.h
	===================================================================
	--- head/sys/mips/broadcom/bcm_machdep.h
	+++ head/sys/mips/broadcom/bcm_machdep.h
	@@ -40,6 +40,8 @@

	#include <dev/bhnd/cores/pmu/bhnd_pmuvar.h>

	+#include "bcm_nvram_cfevar.h"
	+
	extern const struct bhnd_pmu_io bcm_pmu_soc_io;

	struct bcm_platform {
	@@ -65,6 +67,9 @@
	bhnd_erom_t obj;
	} erom;

	+ struct bhnd_nvram_io nvram_io; /< NVRAM I/O context, or NULL if unavailable /
	+ bhnd_nvram_data_class nvram_cls; /< NVRAM data class, or NULL if unavailable /
	+
	#ifdef CFE
	int cfe_console; /*< Console handle, or -1 /
	#endif
	@@ -79,6 +84,10 @@

	u_int bcm_get_uart_rclk(struct bcm_platform *bp);

	+int bcm_get_nvram(struct bcm_platform *bp,
	+ const char name, void outp, size_t *olen,
	+ bhnd_nvram_type type);
	+
	#define BCM_ERR(fmt, ...) \
	printf("%s: " fmt, __FUNCTION__, ##__VA_ARGS__)

	Index: head/sys/mips/broadcom/bcm_machdep.c
	===================================================================
	--- head/sys/mips/broadcom/bcm_machdep.c
	+++ head/sys/mips/broadcom/bcm_machdep.c
	@@ -88,6 +88,7 @@

	#ifdef CFE
	#include <dev/cfe/cfe_api.h>
	+#include <dev/cfe/cfe_error.h>
	#endif

	#if 0
	@@ -112,6 +113,10 @@
	static struct bcm_platform bcm_platform_data;
	static bool bcm_platform_data_avail = false;

	+#ifdef CFE
	+static struct bcm_nvram_iocfe bcm_cfe_nvram;
	+#endif
	+
	static const struct bhnd_core_match bcm_chipc_cores[] = {
	{ BHND_MATCH_CORE(BHND_MFGID_BCM, BHND_COREID_CC) },
	{ BHND_MATCH_CORE(BHND_MFGID_BCM, BHND_COREID_4706_CC) },
	@@ -190,6 +195,40 @@
	}

	/**
	+ * Read a variable directly from NVRAM, decoding as @p type.
	+ *
	+ * @param bp Platform state.
	+ * @param name The raw name of the variable to be fetched,
	+ * including any device path (/pci/1/1/varname) or
	+ * alias prefix (0:varname).
	+ * @param[out] buf On success, the requested value will be written
	+ * to this buffer. This argment may be NULL if
	+ * the value is not desired.
	+ * @param[in,out] len The capacity of @p buf. On success, will be set
	+ * to the actual size of the requested value.
	+ * @param type The data type to be written to @p buf.
	+ *
	+ * @retval 0 success
	+ * @retval ENOMEM If @p buf is non-NULL and a buffer of @p len is too
	+ * small to hold the requested value.
	+ * @retval ENOENT If @p name is not found.
	+ * @retval EFTYPE If the variable data cannot be coerced to @p type.
	+ * @retval ERANGE If value coercion would overflow @p type.
	+ * @retval non-zero If parsing NVRAM otherwise fails, a regular unix error
	+ * code will be returned.
	+ */
	+int
	+bcm_get_nvram(struct bcm_platform bp, const char name, void buf, size_t len,
	+ bhnd_nvram_type type)
	+{
	+ if (bp->nvram_io == NULL \|\| bp->nvram_cls == NULL)
	+ return (ENOENT);
	+
	+ return (bhnd_nvram_data_getvar_direct(bp->nvram_cls, bp->nvram_io, name,
	+ buf, len, type));
	+}
	+
	+/**
	* Probe and attach a bhnd_erom parser instance for the bhnd bus.
	*
	* @param[out] erom_cls The probed EROM class.
	@@ -280,12 +319,20 @@
	bool aob, pmu;
	int error;

	+#ifdef CFE
	/* Fetch CFE console handle (if any). Must be initialized before
	* any calls to printf/early_putc. */
	-#ifdef CFE
	if ((bp->cfe_console = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE)) < 0)
	bp->cfe_console = -1;
	-#endif
	+
	+ /* Probe CFE NVRAM sources */
	+ bp->nvram_io = &bcm_cfe_nvram.io;
	+ error = bcm_nvram_find_cfedev(&bcm_cfe_nvram, &bp->nvram_cls);
	+ if (error) {
	+ bp->nvram_io = NULL;
	+ bp->nvram_cls = NULL;
	+ }
	+#endif /* CFE */

	/* Probe and attach device table provider, populating our
	* chip identification */
	Index: head/sys/mips/broadcom/bcm_nvram_cfe.c
	===================================================================
	--- head/sys/mips/broadcom/bcm_nvram_cfe.c
	+++ head/sys/mips/broadcom/bcm_nvram_cfe.c
	@@ -54,36 +54,18 @@
	#include <dev/cfe/cfe_error.h>
	#include <dev/cfe/cfe_ioctl.h>

	-#include <dev/bhnd/nvram/bhnd_nvram_iovar.h>
	-
	#include "bhnd_nvram_if.h"

	+#include "bcm_machdep.h"
	#include "bcm_nvram_cfevar.h"

	-/**
	- * CFE-backed bhnd_nvram_io implementation.
	- */
	-struct bhnd_nvram_iocfe {
	- struct bhnd_nvram_io io; /*< common I/O instance state /
	-
	- char dname; /< CFE device name (borrowed) /
	- int fd; /*< CFE file descriptor /
	- size_t offset; /*< base offset /
	- size_t size; /*< device size /
	- bool req_blk_erase; /**< flash blocks must be erased
	- before writing */
	-};
	-
	BHND_NVRAM_IOPS_DEFN(iocfe)

	#define IOCFE_LOG(_io, _fmt, ...) \
	printf("%s/%s: " _fmt, __FUNCTION__, (_io)->dname, ##__VA_ARGS__)

	-static int bhnd_nvram_iocfe_new(struct bhnd_nvram_io **io,
	- char *dname);
	-
	-static struct bhnd_nvram_io *bhnd_nvram_find_cfedev(device_t dev,
	- char dname, bhnd_nvram_data_class cls);
	+static int bcm_nvram_iocfe_init(struct bcm_nvram_iocfe *iocfe,
	+ char *dname);

	/** Known CFE NVRAM device names, in probe order. */
	static char *nvram_cfe_devs[] = {
	@@ -99,31 +81,20 @@
	&bhnd_nvram_tlv_class
	};

	-
	static int
	bhnd_nvram_cfe_probe(device_t dev)
	{
	- struct bhnd_nvram_io *io;
	- bhnd_nvram_data_class *cls;
	- const char *cls_desc;
	- char *dname;
	- char *desc;
	-
	- /* Locate a usable CFE device */
	- io = bhnd_nvram_find_cfedev(dev, &dname, &cls);
	- if (io == NULL)
	+ struct bcm_platform *bp;
	+
	+ /* Fetch platform NVRAM I/O context */
	+ bp = bcm_get_platform();
	+ if (bp->nvram_io == NULL)
	return (ENXIO);
	- bhnd_nvram_io_free(io);

	- /* Format the device description */
	- cls_desc = bhnd_nvram_data_class_desc(cls);
	- asprintf(&desc, M_DEVBUF, "%s CFE %s", cls_desc, dname);
	- if (desc != NULL) {
	- device_set_desc_copy(dev, desc);
	- free(desc, M_DEVBUF);
	- } else {
	- device_set_desc(dev, cls_desc);
	- }
	+ KASSERT(bp->nvram_cls != NULL, ("missing NVRAM class"));
	+
	+ /* Set the device description */
	+ device_set_desc(dev, bhnd_nvram_data_class_desc(bp->nvram_cls));

	/* Refuse wildcard attachments */
	return (BUS_PROBE_NOWILDCARD);
	@@ -133,25 +104,19 @@
	static int
	bhnd_nvram_cfe_attach(device_t dev)
	{
	+ struct bcm_platform *bp;
	struct bhnd_nvram_cfe_softc *sc;
	- bhnd_nvram_data_class *cls;
	- struct bhnd_nvram_io *io;
	- char *dname;
	int error;

	+ bp = bcm_get_platform();
	+ KASSERT(bp->nvram_io != NULL, ("missing NVRAM I/O context"));
	+ KASSERT(bp->nvram_cls != NULL, ("missing NVRAM class"));
	+
	sc = device_get_softc(dev);
	sc->dev = dev;

	- /* Locate NVRAM device via CFE */
	- io = bhnd_nvram_find_cfedev(dev, &dname, &cls);
	- if (io == NULL) {
	- device_printf(dev, "CFE NVRAM device not found\n");
	- return (ENXIO);
	- }
	-
	- /* Initialize NVRAM store and free the I/O context */
	- error = bhnd_nvram_store_parse_new(&sc->store, io, cls);
	- bhnd_nvram_io_free(io);
	+ error = bhnd_nvram_store_parse_new(&sc->store, bp->nvram_io,
	+ bp->nvram_cls);
	if (error)
	return (error);

	@@ -201,79 +166,79 @@
	}

	/**
	- * Find, open, identify, and return an I/O context mapping our
	- * CFE NVRAM device.
	+ * Find, open, identify, and initialize an I/O context mapping the CFE NVRAM
	+ * device.
	*
	- * @param dev bhnd_nvram_cfe device.
	- * @param[out] dname On success, the CFE device name.
	+ * @param[out] iocfe On success, an I/O context mapping the CFE NVRAM
	+ * device.
	* @param[out] cls On success, the identified NVRAM data format
	* class.
	*
	- * @retval non-NULL success. the caller inherits ownership of the returned
	- * NVRAM I/O context.
	- * @retval NULL if no usable CFE NVRAM device could be found.
	+ * @retval 0 success. the caller inherits ownership of @p iocfe.
	+ * @retval non-zero if no usable CFE NVRAM device can be found, a standard
	+ * unix error will be returned.
	*/
	-static struct bhnd_nvram_io *
	-bhnd_nvram_find_cfedev(device_t dev, char dname, bhnd_nvram_data_class cls)
	-{
	- struct bhnd_nvram_io *io;
	- int devinfo;
	- int error, result;
	+int
	+bcm_nvram_find_cfedev(struct bcm_nvram_iocfe *iocfe,
	+ bhnd_nvram_data_class **cls)
	+{
	+ char *dname;
	+ int devinfo;
	+ int error, result;

	for (u_int i = 0; i < nitems(nvram_cfe_fmts); i++) {
	*cls = nvram_cfe_fmts[i];

	for (u_int j = 0; j < nitems(nvram_cfe_devs); j++) {
	- *dname = nvram_cfe_devs[j];
	+ dname = nvram_cfe_devs[j];

	/* Does the device exist? */
	- if ((devinfo = cfe_getdevinfo(*dname)) < 0) {
	+ if ((devinfo = cfe_getdevinfo(dname)) < 0) {
	if (devinfo != CFE_ERR_DEVNOTFOUND) {
	- device_printf(dev, "cfe_getdevinfo(%s) "
	- "failed: %d\n", *dname, devinfo);
	+ BCM_ERR("cfe_getdevinfo(%s) failed: "
	+ "%d\n", dname, devinfo);
	}

	continue;
	}

	/* Open for reading */
	- if ((error = bhnd_nvram_iocfe_new(&io, *dname)))
	+ if ((error = bcm_nvram_iocfe_init(iocfe, dname)))
	continue;

	/* Probe */
	- result = bhnd_nvram_data_probe(*cls, io);
	+ result = bhnd_nvram_data_probe(*cls, &iocfe->io);
	if (result <= 0) {
	/* Found a supporting NVRAM data class */
	- return (io);
	+ return (0);
	}

	/* Keep searching */
	- bhnd_nvram_io_free(io);
	- io = NULL;
	+ bhnd_nvram_io_free(&iocfe->io);
	}
	}

	- return (NULL);
	+ return (ENODEV);
	}


	/**
	- * Allocate and return a new I/O context backed by a CFE device.
	+ * Initialize a new CFE device-backed I/O context.
	*
	- * The caller is responsible for deallocating the returned I/O context via
	- * bhnd_nvram_io_free().
	+ * The caller is responsible for releasing all resources held by the returned
	+ * I/O context via bhnd_nvram_io_free().
	*
	- * @param[out] io On success, a valid I/O context for @p dname.
	- * @param dname The name of the CFE device to be opened for reading.
	+ * @param[out] io On success, will be initialized as an I/O context for
	+ * CFE device @p dname.
	+ * @param dname The name of the CFE device to be opened for reading.
	*
	- * @retval 0 success.
	- * @retval non-zero if opening @p dname otherwise fails, a standard unix error
	- * will be returned.
	+ * @retval 0 success.
	+ * @retval non-zero if opening @p dname otherwise fails, a standard unix
	+ * error will be returned.
	*/
	static int
	-bhnd_nvram_iocfe_new(struct bhnd_nvram_io *io, char dname)
	+bcm_nvram_iocfe_init(struct bcm_nvram_iocfe iocfe, char dname)
	{
	- struct bhnd_nvram_iocfe *iocfe;
	nvram_info_t nvram_info;
	int cerr, devinfo, dtype, rlen;
	int64_t nv_offset;
	@@ -281,7 +246,6 @@
	bool req_blk_erase;
	int error;

	- iocfe = malloc(sizeof(*iocfe), M_DEVBUF, M_WAITOK);
	iocfe->io.iops = &bhnd_nvram_iocfe_ops;
	iocfe->dname = dname;

	@@ -290,8 +254,7 @@
	if (iocfe->fd <= 0) {
	IOCFE_LOG(iocfe, "cfe_open() failed: %d\n", iocfe->fd);

	- error = ENXIO;
	- goto failed;
	+ return (ENXIO);
	}

	/* Try to fetch device info */
	@@ -374,32 +337,29 @@
	iocfe->size = nv_size;
	iocfe->req_blk_erase = req_blk_erase;

	- *io = &iocfe->io;
	return (CFE_OK);

	failed:
	if (iocfe->fd >= 0)
	cfe_close(iocfe->fd);

	- free(iocfe, M_DEVBUF);
	-
	- *io = NULL;
	return (error);
	}

	static void
	bhnd_nvram_iocfe_free(struct bhnd_nvram_io *io)
	{
	- struct bhnd_nvram_iocfe iocfe = (struct bhnd_nvram_iocfe )io;
	+ struct bcm_nvram_iocfe iocfe = (struct bcm_nvram_iocfe )io;

	+ /* CFE I/O instances are statically allocated; we do not need to free
	+ * the instance itself */
	cfe_close(iocfe->fd);
	- free(io, M_DEVBUF);
	}

	static size_t
	bhnd_nvram_iocfe_getsize(struct bhnd_nvram_io *io)
	{
	- struct bhnd_nvram_iocfe iocfe = (struct bhnd_nvram_iocfe )io;
	+ struct bcm_nvram_iocfe iocfe = (struct bcm_nvram_iocfe )io;
	return (iocfe->size);
	}

	@@ -438,12 +398,12 @@
	bhnd_nvram_iocfe_read(struct bhnd_nvram_io io, size_t offset, void buffer,
	size_t nbytes)
	{
	- struct bhnd_nvram_iocfe *iocfe;
	+ struct bcm_nvram_iocfe *iocfe;
	size_t remain;
	int64_t cfe_offset;
	int nr, nreq;

	- iocfe = (struct bhnd_nvram_iocfe *)io;
	+ iocfe = (struct bcm_nvram_iocfe *)io;

	/* Determine (and validate) the base CFE offset */
	#if (SIZE_MAX > INT64_MAX)
	Index: head/sys/mips/broadcom/bcm_nvram_cfevar.h
	===================================================================
	--- head/sys/mips/broadcom/bcm_nvram_cfevar.h
	+++ head/sys/mips/broadcom/bcm_nvram_cfevar.h
	@@ -36,8 +36,28 @@
	#include <sys/bus.h>

	#include <dev/bhnd/nvram/bhnd_nvram.h>
	+#include <dev/bhnd/nvram/bhnd_nvram_iovar.h>
	#include <dev/bhnd/nvram/bhnd_nvram_store.h>

	+struct bcm_nvram_iocfe;
	+
	+int bcm_nvram_find_cfedev(struct bcm_nvram_iocfe *iocfe,
	+ bhnd_nvram_data_class **cls);
	+
	+/**
	+ * CFE-backed bhnd_nvram_io implementation.
	+ */
	+struct bcm_nvram_iocfe {
	+ struct bhnd_nvram_io io; /*< common I/O instance state /
	+
	+ char dname; /< CFE device name (borrowed) /
	+ int fd; /*< CFE file descriptor /
	+ size_t offset; /*< base offset /
	+ size_t size; /*< device size /
	+ bool req_blk_erase; /**< flash blocks must be erased
	+ before writing */
	+};
	+
	/** bhnd_nvram_cfe driver instance state. */
	struct bhnd_nvram_cfe_softc {
	device_t dev;

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