[driver] Split out iSCSI-specific code to ibft.c

ipxe · Oct 22, 2009 · 9586a92 · 9586a92
1 parent 781d208
commit 9586a92
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Showing 6 changed files with 799 additions and 744 deletions.
diff --git a/driver/acpi.c b/driver/acpi.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2008 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ntddk.h>
+#include "sanbootconf.h"
+#include "acpi.h"
+
+/** Start of region to scan in base memory */
+#define BASEMEM_START 0x80000
+
+/** End of region to scan in base memory */
+#define BASEMEM_END 0xa0000
+
+/** Length of region to scan in base memory */
+#define BASEMEM_LEN ( BASEMEM_END - BASEMEM_START )
+
+/**
+ * Calculate byte checksum
+ *
+ * @v data		Region to checksum
+ * @v len		Length of region
+ * @ret checksum	Byte checksum
+ */
+static UCHAR byte_sum ( PUCHAR data, ULONG len ) {
+	UCHAR checksum = 0;
+	ULONG offset;
+
+	for ( offset = 0 ; offset < len ; offset++ )
+		checksum = ( ( UCHAR ) ( checksum + data[offset] ) );
+
+	return checksum;
+}
+
+/**
+ * Search for ACPI table in base memory
+ *
+ * @v signature		Table signature
+ * @ret table_copy	Copy of table, or NULL
+ *
+ * The returned table is allocated using ExAllocatePool().
+ */
+NTSTATUS find_acpi_table ( PCHAR signature,
+			   PACPI_DESCRIPTION_HEADER *table_copy ) {
+	PHYSICAL_ADDRESS basemem_phy;
+	PUCHAR basemem;
+	ULONG offset;
+	PACPI_DESCRIPTION_HEADER table;
+	NTSTATUS status;
+
+	/* Map base memory */
+	basemem_phy.QuadPart = BASEMEM_START;
+	basemem = MmMapIoSpace ( basemem_phy, BASEMEM_LEN, MmNonCached );
+	if ( ! basemem ) {
+		DbgPrint ( "Could not map base memory\n" );
+		status = STATUS_UNSUCCESSFUL;
+		goto err_mmmapiospace;
+	}
+
+	/* Scan for table */
+	status = STATUS_NO_SUCH_FILE;
+	for ( offset = 0 ; offset < BASEMEM_LEN ; offset += 16 ) {
+		table = ( ( PACPI_DESCRIPTION_HEADER ) ( basemem + offset ) );
+		if ( memcmp ( table->signature, signature,
+			      sizeof ( table->signature ) ) != 0 )
+			continue;
+		if ( ( offset + table->length ) > BASEMEM_LEN )
+			continue;
+		if ( byte_sum ( ( ( PUCHAR ) table ), table->length ) != 0 )
+			continue;
+		DbgPrint ( "Found ACPI table \"%.4s\" at %05x OEM ID "
+			   "\"%.6s\" OEM table ID \"%.8s\"\n", signature,
+			   ( BASEMEM_START + offset ), table->oem_id,
+			   table->oem_table_id );
+		/* Create copy of table */
+		*table_copy = ExAllocatePoolWithTag ( NonPagedPool,
+						      table->length,
+						      SANBOOTCONF_POOL_TAG );
+		if ( ! *table_copy ) {
+			DbgPrint ( "Could not allocate table copy\n" );
+			status = STATUS_NO_MEMORY;
+			goto err_exallocatepoolwithtag;
+		}
+		RtlCopyMemory ( *table_copy, table, table->length );
+		status = STATUS_SUCCESS;
+		break;
+	}
+
+ err_exallocatepoolwithtag:
+	MmUnmapIoSpace ( basemem, BASEMEM_LEN );
+ err_mmmapiospace:
+	return status;
+}
diff --git a/driver/acpi.h b/driver/acpi.h
@@ -36,4 +36,7 @@ typedef struct _ACPI_DESCRIPTION_HEADER {
 } ACPI_DESCRIPTION_HEADER, *PACPI_DESCRIPTION_HEADER;
 #pragma pack()
 
+extern NTSTATUS find_acpi_table ( PCHAR signature,
+				  PACPI_DESCRIPTION_HEADER *table_copy );
+
 #endif /* _ACPI_H */