1 files changed, 115 insertions, 0 deletions

diff --git a/qemu/roms/ipxe/src/interface/linux/linux_smbios.c b/qemu/roms/ipxe/src/interface/linux/linux_smbios.c
new file mode 100644
index 000000000..6e5174d23
--- /dev/null
+++ b/qemu/roms/ipxe/src/interface/linux/linux_smbios.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <errno.h>
+#include <linux_api.h>
+#include <ipxe/linux.h>
+#include <ipxe/smbios.h>
+
+/** SMBIOS filename */
+static const char smbios_filename[] = "/dev/mem";
+
+/** SMBIOS entry point scan region start address */
+#define SMBIOS_ENTRY_START 0xf0000
+
+/** SMBIOS entry point scan region length */
+#define SMBIOS_ENTRY_LEN 0x10000
+
+/** SMBIOS mapping alignment */
+#define SMBIOS_ALIGN 0x1000
+
+/**
+ * Find SMBIOS
+ *
+ * @v smbios		SMBIOS entry point descriptor structure to fill in
+ * @ret rc		Return status code
+ */
+static int linux_find_smbios ( struct smbios *smbios ) {
+	struct smbios_entry entry;
+	void *entry_mem;
+	void *smbios_mem;
+	size_t smbios_offset;
+	size_t smbios_indent;
+	size_t smbios_len;
+	int fd;
+	int rc;
+
+	/* Open SMBIOS file */
+	fd = linux_open ( smbios_filename, O_RDONLY );
+	if ( fd < 0 ) {
+		rc = -ELINUX ( linux_errno );
+		DBGC ( smbios, "SMBIOS could not open %s: %s\n",
+		       smbios_filename, linux_strerror ( linux_errno ) );
+		goto err_open;
+	}
+
+	/* Map the region potentially containing the SMBIOS entry point */
+	entry_mem = linux_mmap ( NULL, SMBIOS_ENTRY_LEN, PROT_READ, MAP_SHARED,
+				 fd, SMBIOS_ENTRY_START );
+	if ( entry_mem == MAP_FAILED ) {
+		rc = -ELINUX ( linux_errno );
+		DBGC ( smbios, "SMBIOS could not mmap %s (%#x+%#x): %s\n",
+		       smbios_filename, SMBIOS_ENTRY_START, SMBIOS_ENTRY_LEN,
+		       linux_strerror ( linux_errno ) );
+		goto err_mmap_entry;
+	}
+
+	/* Scan for the SMBIOS entry point */
+	if ( ( rc = find_smbios_entry ( virt_to_user ( entry_mem ),
+					SMBIOS_ENTRY_LEN, &entry ) ) != 0 )
+		goto err_find_entry;
+
+	/* Map the region containing the SMBIOS structures */
+	smbios_indent = ( entry.smbios_address & ( SMBIOS_ALIGN - 1 ) );
+	smbios_offset = ( entry.smbios_address - smbios_indent );
+	smbios_len = ( entry.smbios_len + smbios_indent );
+	smbios_mem = linux_mmap ( NULL, smbios_len, PROT_READ, MAP_SHARED,
+				  fd, smbios_offset );
+	if ( smbios_mem == MAP_FAILED ) {
+		rc = -ELINUX ( linux_errno );
+		DBGC ( smbios, "SMBIOS could not mmap %s (%#zx+%#zx): %s\n",
+		       smbios_filename, smbios_offset, smbios_len,
+		       linux_strerror ( linux_errno ) );
+		goto err_mmap_smbios;
+	}
+
+	/* Fill in entry point descriptor structure */
+	smbios->address = virt_to_user ( smbios_mem + smbios_indent );
+	smbios->len = entry.smbios_len;
+	smbios->count = entry.smbios_count;
+	smbios->version = SMBIOS_VERSION ( entry.major, entry.minor );
+
+	/* Unmap the entry point region (no longer required) */
+	linux_munmap ( entry_mem, SMBIOS_ENTRY_LEN );
+
+	return 0;
+
+	linux_munmap ( smbios_mem, smbios_len );
+ err_mmap_smbios:
+ err_find_entry:
+	linux_munmap ( entry_mem, SMBIOS_ENTRY_LEN );
+ err_mmap_entry:
+	linux_close ( fd );
+ err_open:
+	return rc;
+}
+
+PROVIDE_SMBIOS ( linux, find_smbios, linux_find_smbios );