Add UCB RISCV support for architecture, soc, and emulation mainboard..

Works in the RISCV version of QEMU.

Note that the lzmadecode is so unclean that it needs a lot of work.
A cleanup is in progress.

We decided in Prague to do this as one thing, because it forms a nice case study
of the bare minimum you need to add to get a new architecture going in qemu.

Change-Id: If5af15c3a70733d219973e0d032746f8ab027e4d
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: http://review.coreboot.org/7584
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)

1 files changed, 100 insertions, 0 deletions

diff --git a/src/arch/riscv/rom_media.c b/src/arch/riscv/rom_media.c
new file mode 100644
index 0000000000..712b7c49d4
--- /dev/null
+++ b/src/arch/riscv/rom_media.c
@@ -0,0 +1,100 @@
+/*
+ * 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 rom_media_open(struct cbfs_media *media) {
+	return 0;
+}
+
+static void *rom_media_map(struct cbfs_media *media, size_t offset, size_t count) {
+	void *ptr;
+	printk(BIOS_INFO, "%s: media %p, offset %lx, size %ld.\n", __func__, media, offset, count);
+
+	ptr = (void*)offset;
+	return ptr;
+}
+
+static void *rom_media_unmap(struct cbfs_media *media, const void *address) {
+	return NULL;
+}
+
+static size_t rom_media_read(struct cbfs_media *media, void *dest, size_t offset,
+			   size_t count) {
+	void *ptr = rom_media_map(media, offset, count);
+	memcpy(dest, ptr, count);
+	rom_media_unmap(media, ptr);
+	return count;
+}
+
+static int rom_media_close(struct cbfs_media *media) {
+	return 0;
+}
+
+static int init_rom_media_cbfs(struct cbfs_media *media) {
+	//extern unsigned long _cbfs_master_header;
+	// 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*) CONFIG_CBFS_HEADER_ROM_OFFSET; //&_cbfs_master_header;
+	if (CBFS_HEADER_MAGIC != ntohl(header->magic)) {
+		printk(BIOS_ERR, "Invalid CBFS master header at %p\n", header);
+		printk(BIOS_ERR, "Expected %08lx and got %08lx\n", (unsigned long) CBFS_HEADER_MAGIC, (unsigned long) ntohl(header->magic));
+		return -1;
+	} else {
+		uint32_t romsize = ntohl(header->romsize);
+		media->context = (void*)(uintptr_t)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 = rom_media_open;
+	media->close = rom_media_close;
+	media->map = rom_media_map;
+	media->unmap = rom_media_unmap;
+	media->read = rom_media_read;
+	return 0;
+}
+
+int init_default_cbfs_media(struct cbfs_media *media) {
+	return init_rom_media_cbfs(media);
+}
+// bug in coreboot. Fix me.
+// even if you have no use for lzma cbfs demands it.
+// and the ulzma code is terrible -- full of bad 32/64 bad things.
+unsigned long ulzma(unsigned char *src, unsigned char *dst);
+unsigned long ulzma(unsigned char *src, unsigned char *dst)
+{
+	return 0;
+}