intel/apollolake: Add API for get_bios_size and use it

get_bios_size returns the value of bios_size. Use this function to
calculate bios_size for caching in bootblock.

BUG=chrome-os-partner:54563

Change-Id: I2e592b1c52138bd4623ad2acd05c744224a8e50b
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/15292
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/soc/intel/apollolake/bootblock/bootblock.c

@@ -22,6 +22,7 @@
 #include <soc/iomap.h>
 #include <soc/cpu.h>
 #include <soc/gpio.h>
+#include <soc/mmap_boot.h>
 #include <soc/northbridge.h>
 #include <soc/pci_devs.h>
 #include <soc/uart.h>
@@ -87,7 +88,8 @@ void asmlinkage bootblock_c_entry(uint64_t base_timestamp)
 static void cache_bios_region(void)
 {
 	int mtrr;
-	uint32_t rom_size, alignment;
+	size_t rom_size;
+	uint32_t alignment;
 
 	mtrr = get_free_var_mtrr();
 
@@ -95,7 +97,8 @@ static void cache_bios_region(void)
 		return;
 
 	/* Only the IFD BIOS region is memory mapped (at top of 4G) */
-	rom_size =  CONFIG_IFD_BIOS_END - CONFIG_IFD_BIOS_START;
+	rom_size =  get_bios_size();
+
 	/* Round to power of two */
 	alignment = 1 << (log2_ceil(rom_size));
 	rom_size = ALIGN_UP(rom_size, alignment);

src/soc/intel/apollolake/include/soc/mmap_boot.h

@@ -0,0 +1,22 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Google Inc.
+ *
+ * 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
+ * (at your option) 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.
+ */
+
+#ifndef __SOC_APOLLOLAKE_MMAP_BOOT_H__
+#define __SOC_APOLLOLAKE_MMAP_BOOT_H__
+
+size_t get_bios_size(void);
+
+#endif /* __SOC_APOLLOLAKE_MMAP_BOOT_H__ */

src/soc/intel/apollolake/mmap_boot.c

@@ -23,6 +23,7 @@
 #include <console/console.h>
 #include <fmap.h>
 #include <soc/intel/common/nvm.h>
+#include <soc/mmap_boot.h>
 #include <soc/spi.h>
 
 /*
@@ -87,11 +88,6 @@ static void bios_mmap_init(void)
 		     SPIBAR_BFPREG_PRL_SHIFT) + 1) * 4 * KiB;
 	size = bios_end - start;
 
-	printk(BIOS_INFO, "IFD BIOS region info loaded from FLREG%d\n",
-	       (val & SPIBAR_BFPREG_SBRS) ? 6 : 1);
-	printk(BIOS_INFO, "IFD BIOS Start: 0x%zx\n", start);
-	printk(BIOS_INFO, "IFD BIOS End  : 0x%zx\n", bios_end);
-
 	/* BIOS region is mapped right below 4G. */
 	base = 4ULL * GiB - size;
 
@@ -167,3 +163,9 @@ uint32_t nvm_mmio_to_flash_offset(void *p)
 	 */
 	return (uintptr_t)p - (4ULL * GiB - size) + start;
 }
+
+size_t get_bios_size(void)
+{
+	bios_mmap_init();
+	return car_get_var(bios_size);
+}