Extend CBFS to support arbitrary ROM source media.

Summary:
	Isolate CBFS underlying I/O to board/arch-specific implementations as
	"media stream", to allow loading and booting romstage on non-x86.

	CBFS functions now all take a new "media source" parameter; use
	CBFS_DEFAULT_MEDIA if you simply want to load from main firmware.
	API Changes:
		cbfs_find => cbfs_get_file.
		cbfs_find_file => cbfs_get_file_content.
		cbfs_get_file => cbfs_get_file_content with correct type.

CBFS used to work only on memory-mapped ROM (all x86). For platforms like ARM,
the ROM may come from USB, UART, or SPI -- any serial devices and not available
for memory mapping.

To support these devices (and allowing CBFS to read from multiple source
at the same time), CBFS operations are now virtual-ized into "cbfs_media".  To
simplify porting existing code, every media source must support both "reading
into pre-allocated memory (read)" and "read and return an allocated buffer
(map)". For devices without native memory-mapped ROM, "cbfs_simple_buffer*"
provides simple memory mapping simulation.

Every CBFS function now takes a cbfs_media* as parameter. CBFS_DEFAULT_MEDIA
is defined for CBFS functions to automatically initialize a per-board default
media (CBFS will internally calls init_default_cbfs_media).  Also revised CBFS
function names relying on memory mapped backend (ex, "cbfs_find" => actually
loads files). Now we only have two getters:
	struct cbfs_file *entry = cbfs_get_file(media, name);
	void *data = cbfs_get_file_content(CBFS_DEFAULT_MEDIA, name, type);

Test results:
 - Verified to work on x86/qemu.
 - Compiles on ARM, and follow up commit will provide working SPI driver.

Change-Id: Iac911ded25a6f2feffbf3101a81364625bb07746
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: http://review.coreboot.org/2182
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

8 files changed, 153 insertions, 78 deletions

diff --git a/src/arch/armv7/boot/coreboot_table.c b/src/arch/armv7/boot/coreboot_table.c
index 86a004d887..b2d88aa776 100644
--- a/src/arch/armv7/boot/coreboot_table.c
+++ b/src/arch/armv7/boot/coreboot_table.c
@@ -640,7 +640,9 @@ unsigned long write_coreboot_table(
 
 #if CONFIG_USE_OPTION_TABLE
 	{
-		struct cmos_option_table *option_table = cbfs_find_file("cmos_layout.bin", 0x1aa);
+		struct cmos_option_table *option_table = cbfs_get_file_content(
+				CBFS_DEFAULT_MEDIA, "cmos_layout.bin",
+				CBFS_COMPONENT_CMOS_LAYOUT);
 		if (option_table) {
 			struct lb_record *rec_dest = lb_new_record(head);
 			/* Copy the option config table, it's already a lb_record... */
diff --git a/src/arch/armv7/bootblock_simple.c b/src/arch/armv7/bootblock_simple.c
index af76d4c973..d97075e2f8 100644
--- a/src/arch/armv7/bootblock_simple.c
+++ b/src/arch/armv7/bootblock_simple.c
@@ -45,7 +45,9 @@ void main(unsigned long bist)
 	}
 
 	printk(BIOS_INFO, "bootblock main(): loading romstage\n");
-	romstage_entry = loadstage(target1);
+	romstage_entry = (unsigned long)cbfs_load_stage(
+			CBFS_DEFAULT_MEDIA, target1);
+
 	printk(BIOS_INFO, "bootblock main(): jumping to romstage\n");
 	if (romstage_entry) bootblock_exit(romstage_entry);
 	hlt();
diff --git a/src/arch/armv7/include/arch/cbfs.h b/src/arch/armv7/include/arch/cbfs.h
index f060643936..e34a0d2b27 100644
--- a/src/arch/armv7/include/arch/cbfs.h
+++ b/src/arch/armv7/include/arch/cbfs.h
@@ -20,82 +20,41 @@
 #ifndef __INCLUDE_ARCH_CBFS__
 #define __INCLUDE_ARCH_CBFS__
 
-#include <string.h>
-#include <types.h>
 #include <cbfs_core.h>
 #include <arch/byteorder.h>
-#include <arch/cbfs.h>
 
+// TODO FIXME This file is only for providing CBFS function in bootblock.
+// Should be removed once bootblock can link lib/* files.
+#include "lib/cbfs.c"
 
-static int cbfs_check_magic(struct cbfs_file *file)
-{
-	return strcmp(file->magic, CBFS_FILE_MAGIC) ? 0 : 1;
+// mem* and ulzma are now workarounds for bootblock compilation.
+void *memcpy(void *dest, const void *src, size_t n) {
+	char *d = (char *)dest;
+	const char *s = (const char*)src;
+	while (n-- > 0)
+		*d++ = *s++;
+	return dest;
 }
 
-static unsigned long loadstage(const char* target)
-{
-	unsigned long offset, align;
-	struct cbfs_header *header = (struct cbfs_header *)(CONFIG_BOOTBLOCK_BASE + 0x40);
-	/* FIXME: magic offsets */
-	// if (ntohl(header->magic) != CBFS_HEADER_MAGIC)
-	// 	printk(BIOS_ERR, "ERROR: No valid CBFS header found!\n");
+void *memset(void *dest, int c, size_t n) {
+	char *d = (char*)dest;
+	while (n-- > 0)
+		*d++ = c;
+	return dest;
+}
+
+int memcmp(const void *ptr1, const void *ptr2, size_t n) {
+	const char *s1 = (const char*)ptr1, *s2 = (const char*)ptr2;
+	int c;
+	while (n-- > 0)
+		if ((c = *s1++ - *s2++))
+			return c;
+	return 0;
+}
 
-	offset = ntohl(header->offset);
-	align = ntohl(header->align);
-	printk(BIOS_INFO, "cbfs header (0x%p)\n", header);
-	printk(BIOS_INFO, "\tmagic: 0x%08x\n", ntohl(header->magic));
-	printk(BIOS_INFO, "\tversion: 0x%08x\n", ntohl(header->version));
-	printk(BIOS_INFO, "\tromsize: 0x%08x\n", ntohl(header->romsize));
-	printk(BIOS_INFO, "\tbootblocksize: 0x%08x\n", ntohl(header->bootblocksize));
-	printk(BIOS_INFO, "\talign: 0x%08x\n", ntohl(header->align));
-	printk(BIOS_INFO, "\toffset: 0x%08x\n", ntohl(header->offset));
-	while(1) {
-		struct cbfs_file *file;
-		struct cbfs_stage *stage;
-		/* FIXME: SPI image hack */
-		file = (struct cbfs_file *)(offset + CONFIG_SPI_IMAGE_HACK);
-		if (!cbfs_check_magic(file)) {
-			printk(BIOS_INFO, "magic is wrong, file: %p\n", file);
-			return 0;
-		}
-		if (!strcmp(CBFS_NAME(file), target)) {
-			uint32_t  load, entry;
-			printk(BIOS_INFO, "CBFS name matched, offset: %p\n", file);
-			printk(BIOS_INFO, "\tmagic: %02x%02x%02x%02x%02x%02x%02x%02x\n",
-				file->magic[0], file->magic[1], file->magic[2], file->magic[3],
-				file->magic[4], file->magic[5], file->magic[6], file->magic[7]);
-			printk(BIOS_INFO, "\tlen: 0x%08x\n", ntohl(file->len));
-			printk(BIOS_INFO, "\ttype: 0x%08x\n", ntohl(file->type));
-			printk(BIOS_INFO, "\tchecksum: 0x%08x\n", ntohl(file->checksum));
-			printk(BIOS_INFO, "\toffset: 0x%08x\n", ntohl(file->offset));
-			/* exploit the fact that this is all word-aligned. */
-			stage = CBFS_SUBHEADER(file);
-			load = stage->load;
-			entry = stage->entry;
-			int i;
-			u32 *to = (void *)load;
-			u32 *from = (void *)((u8 *)stage+sizeof(*stage));
-			/* we could do memmove/memset here. But the math gets messy. 
-			 * far easier just to do what we want.
-			 */
-			 printk(BIOS_INFO, "entry: 0x%08x, load: 0x%08x, "
-			 	"len: 0x%08x, memlen: 0x%08x\n", entry,
-				 load, stage->len, stage->memlen);
-			for(i = 0; i < stage->len; i += 4)
-				*to++ = *from++;
-			for(; i < stage->memlen; i += 4)
-				*to++ = 0;
-			return entry;
-		}
-		int flen = ntohl(file->len);
-		int foffset = ntohl(file->offset);
-		unsigned long oldoffset = offset;
-		offset = ALIGN(offset + foffset + flen, align);
-		printk(BIOS_INFO, "offset: 0x%08lx\n", offset);
-		if (offset <= oldoffset)
-			return 0;
-		if (offset > CONFIG_ROMSTAGE_SIZE)
-			return 0;
-	}
+unsigned long ulzma(unsigned char *src, unsigned char *dest) {
+	// TODO remove this.
+	return -1;
 }
-#endif
+
+#endif // __INCLUDE_ARCH_CBFS__
diff --git a/src/arch/x86/boot/coreboot_table.c b/src/arch/x86/boot/coreboot_table.c
index 8dccd77287..04fba47b3f 100644
--- a/src/arch/x86/boot/coreboot_table.c
+++ b/src/arch/x86/boot/coreboot_table.c
@@ -638,7 +638,9 @@ unsigned long write_coreboot_table(
 
 #if CONFIG_USE_OPTION_TABLE
 	{
-		struct cmos_option_table *option_table = cbfs_find_file("cmos_layout.bin", 0x1aa);
+		struct cmos_option_table *option_table = cbfs_get_file_content(
+				CBFS_DEFAULT_MEDIA, "cmos_layout.bin",
+				CBFS_COMPONENT_CMOS_LAYOUT);
 		if (option_table) {
 			struct lb_record *rec_dest = lb_new_record(head);
 			/* Copy the option config table, it's already a lb_record... */
diff --git a/src/arch/x86/boot/smbios.c b/src/arch/x86/boot/smbios.c
index 72e70bacea..f65ced2746 100644
--- a/src/arch/x86/boot/smbios.c
+++ b/src/arch/x86/boot/smbios.c
@@ -120,7 +120,6 @@ static int smbios_processor_name(char *start)
 
 static int smbios_write_type0(unsigned long *current, int handle)
 {
-	struct cbfs_header *hdr;
 	struct smbios_type0 *t = (struct smbios_type0 *)*current;
 	int len = sizeof(struct smbios_type0);
 
@@ -143,8 +142,15 @@ static int smbios_write_type0(unsigned long *current, int handle)
 	vboot_data->vbt10 = (u32)t->eos + (version_offset - 1);
 #endif
 
-	if ((hdr = get_cbfs_header()) != (struct cbfs_header *)0xffffffff)
-		t->bios_rom_size = (ntohl(hdr->romsize) / 65535) - 1;
+	{
+		const struct cbfs_header *header;
+		u32 romsize = CONFIG_ROM_SIZE;
+		header = cbfs_get_header(CBFS_DEFAULT_MEDIA);
+		if (header != CBFS_HEADER_INVALID_ADDRESS)
+			romsize = ntohl(header->romsize);
+		t->bios_rom_size = (romsize / 65535) - 1;
+	}
+
 	t->system_bios_major_release = 4;
 	t->bios_characteristics =
 		BIOS_CHARACTERISTICS_PCI_SUPPORTED |
diff --git a/src/arch/x86/lib/Makefile.inc b/src/arch/x86/lib/Makefile.inc
index 2186072ab4..f4dc8b8426 100644
--- a/src/arch/x86/lib/Makefile.inc
+++ b/src/arch/x86/lib/Makefile.inc
@@ -8,13 +8,16 @@ ramstage-$(CONFIG_IOAPIC) += ioapic.c
 ramstage-y += memset.c
 ramstage-y += memcpy.c
 ramstage-y += ebda.c
+ramstage-y += rom_media.c
 
 romstage-y += romstage_console.c
 romstage-y += cbfs_and_run.c
 romstage-y += memset.c
 romstage-y += memcpy.c
+romstage-y += rom_media.c
 
 smm-y += memset.c
 smm-y += memcpy.c
+smm-y += rom_media.c
 
 $(obj)/arch/x86/lib/console.ramstage.o :: $(obj)/build.h
diff --git a/src/arch/x86/lib/cbfs_and_run.c b/src/arch/x86/lib/cbfs_and_run.c
index 1f87e7ab62..a023141650 100644
--- a/src/arch/x86/lib/cbfs_and_run.c
+++ b/src/arch/x86/lib/cbfs_and_run.c
@@ -28,7 +28,7 @@ static void cbfs_and_run_core(const char *filename, unsigned ebp)
 
 	timestamp_add_now(TS_START_COPYRAM);
 	print_debug("Loading image.\n");
-	dst = cbfs_load_stage(filename);
+	dst = cbfs_load_stage(CBFS_DEFAULT_MEDIA, filename);
 	if ((void *)dst == (void *) -1)
 		die("FATAL: Essential component is missing.\n");
 
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);
+}