1 files changed, 101 insertions, 0 deletions
diff --git a/src/arch/x86/lib/rom_media.c b/src/arch/x86/lib/rom_media.c
new file mode 100644
index 0000000000..ed2122cb4e
--- /dev/null
+++ b/src/arch/x86/lib/rom_media.c
@@ -0,0 +1,101 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 The Chromium OS Authors. All rights reserved.
+ *
+ * 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; version 2 of
+ * the License.
+ *
+ * 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 St, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+#include <cbfs.h>
+#include <string.h>
+
+#ifdef LIBPAYLOAD
+# define printk(x...)
+# define init_default_cbfs_media libpayload_init_default_cbfs_media
+  extern int libpayload_init_default_cbfs_media(struct cbfs_media *media);
+#else
+# include <console/console.h>
+#endif
+
+// Implementation of memory-mapped ROM media source on X86.
+
+static int x86_rom_open(struct cbfs_media *media) {
+	return 0;
+}
+
+static void *x86_rom_map(struct cbfs_media *media, size_t offset, size_t count) {
+	void *ptr;
+	// Some address (ex, pointer to master header) may be given in memory
+	// mapped location. To workaround that, we handle >0xf0000000 as real
+	// memory pointer.
+
+	if ((uint32_t)offset > (uint32_t)0xf0000000)
+		ptr = (void*)offset;
+	else
+		ptr = (void*)(0 - (uint32_t)media->context + offset);
+	return ptr;
+}
+
+static void *x86_rom_unmap(struct cbfs_media *media, const void *address) {
+	return NULL;
+}
+
+static size_t x86_rom_read(struct cbfs_media *media, void *dest, size_t offset,
+			   size_t count) {
+	void *ptr = x86_rom_map(media, offset, count);
+	memcpy(dest, ptr, count);
+	x86_rom_unmap(media, ptr);
+	return count;
+}
+
+static int x86_rom_close(struct cbfs_media *media) {
+	return 0;
+}
+
+int init_x86rom_cbfs_media(struct cbfs_media *media);
+int init_x86rom_cbfs_media(struct cbfs_media *media) {
+	// On X86, we always keep a reference of pointer to CBFS header in
+	// 0xfffffffc, and the pointer is still a memory-mapped address.
+	// Since the CBFS core always use ROM offset, we need to figure out
+	// header->romsize even before media is initialized.
+	struct cbfs_header *header = (struct cbfs_header*)
+			*(uint32_t*)(0xfffffffc);
+	if (CBFS_HEADER_MAGIC != ntohl(header->magic)) {
+#if defined(CONFIG_ROM_SIZE)
+		printk(BIOS_ERR, "Invalid CBFS master header at %p\n", header);
+		media->context = (void*)CONFIG_ROM_SIZE;
+#else
+		return -1;
+#endif
+	} else {
+		uint32_t romsize = ntohl(header->romsize);
+		media->context = (void*)romsize;
+#if defined(CONFIG_ROM_SIZE)
+		if (CONFIG_ROM_SIZE != romsize)
+			printk(BIOS_INFO, "Warning: rom size unmatch (%d/%d)\n",
+			       CONFIG_ROM_SIZE, romsize);
+#endif
+	}
+	media->open = x86_rom_open;
+	media->close = x86_rom_close;
+	media->map = x86_rom_map;
+	media->unmap = x86_rom_unmap;
+	media->read = x86_rom_read;
+	return 0;
+}
+
+int init_default_cbfs_media(struct cbfs_media *media) {
+	return init_x86rom_cbfs_media(media);
+}