Generic approach of putting BIOS tables at the end of memory
(in addition to their low locations)

This adds the kontron 986LCD-M and the i945 as a sample.

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>


Index: src/include/boot/tables.h
===================================================================
--- src/include/boot/tables.h	(revision 3886)
+++ src/include/boot/tables.h	(working copy)
@@ -3,6 +3,9 @@
 
 #include <boot/coreboot_tables.h>
 
+void lb_add_memory_range(struct lb_memory *mem,
+	uint32_t type, uint64_t start, uint64_t size);
+
 struct lb_memory *write_tables(void);
 
 #endif /* BOOT_TABLES_H */
Index: src/mainboard/kontron/986lcd-m/Options.lb
===================================================================
--- src/mainboard/kontron/986lcd-m/Options.lb	(revision 3886)
+++ src/mainboard/kontron/986lcd-m/Options.lb	(working copy)
@@ -29,6 +29,8 @@
 uses LB_CKS_RANGE_END
 uses LB_CKS_LOC
 uses HAVE_ACPI_TABLES
+uses HAVE_MAINBOARD_RESOURCES
+uses HAVE_HIGH_TABLES
 # SMP
 uses CONFIG_SMP
 uses CONFIG_LOGICAL_CPUS
@@ -160,6 +164,8 @@
 ## Build code to provide ACPI support
 ##
 default HAVE_ACPI_TABLES=1
+default HAVE_MAINBOARD_RESOURCES=1
+default HAVE_HIGH_TABLES=0
 
 ##
 ## Build code to export a CMOS option table
Index: src/mainboard/kontron/986lcd-m/acpi_tables.c
===================================================================
--- src/mainboard/kontron/986lcd-m/acpi_tables.c	(revision 3886)
+++ src/mainboard/kontron/986lcd-m/acpi_tables.c	(working copy)
@@ -289,6 +289,11 @@
 
 	printk_debug("ACPI:     * DMI (Linux workaround)\n");
 	memcpy((void *)0xfff80, dmi_table, DMI_TABLE_SIZE);
+#if HAVE_HIGH_TABLES == 1
+	memcpy((void *)current, dmi_table, DMI_TABLE_SIZE);
+	current += DMI_TABLE_SIZE;
+	ALIGN_CURRENT;
+#endif
 
 	printk_info("ACPI: done.\n");
 	return current;
Index: src/mainboard/kontron/986lcd-m/mainboard.c
===================================================================
--- src/mainboard/kontron/986lcd-m/mainboard.c	(revision 3886)
+++ src/mainboard/kontron/986lcd-m/mainboard.c	(working copy)
@@ -21,8 +21,31 @@
 
 
 #include <device/device.h>
+#include <console/console.h>
+#include <boot/tables.h>
 #include "chip.h"
 
+/* in arch/i386/boot/tables.c */
+extern uint64_t high_tables_base, high_tables_size;
+
+/* in northbridge/intel/i945/northbridge.c */
+extern uint64_t uma_memory_base, uma_memory_size;
+
+int add_mainboard_resources(struct lb_memory *mem)
+{
+#if HAVE_HIGH_TABLES == 1
+	printk_debug("Adding high table area\n");
+	lb_add_memory_range(mem, LB_MEM_TABLE,
+		high_tables_base, high_tables_size);
+#endif
+	printk_debug("Adding UMA memory area\n");
+	lb_add_memory_range(mem, LB_MEM_RESERVED, 
+		uma_memory_base, uma_memory_size);
+
+	return 0;
+}
+
+
 struct chip_operations mainboard_kontron_986lcd_m_ops = {
 	CHIP_NAME("Kontron 986LCD-M Mainboard")
 };
Index: src/config/Options.lb
===================================================================
--- src/config/Options.lb	(revision 3886)
+++ src/config/Options.lb	(working copy)
@@ -410,7 +410,7 @@
 define DEBUG
 	default 1
 	export always
-	comment "Enable debugging code"
+	comment "Enable x86emu debugging code"
 end
 define CONFIG_CONSOLE_VGA
 	default 0
@@ -1111,6 +1111,18 @@
 	comment "Enable if the mainboard/chipset requires extra entries in the memory map"
 end
 
+define HAVE_LOW_TABLES
+	default 1
+	export always
+	comment "Enable if ACPI, PIRQ, MP tables are supposed to live in the low megabyte"
+end
+
+define HAVE_HIGH_TABLES
+	default 0
+	export always
+	comment "Enable if ACPI, PIRQ, MP tables are supposed to live at top of memory"
+end
+
 define CONFIG_SPLASH_GRAPHIC
 	default 0
 	export used
Index: src/northbridge/intel/i945/northbridge.c
===================================================================
--- src/northbridge/intel/i945/northbridge.c	(revision 3886)
+++ src/northbridge/intel/i945/northbridge.c	(working copy)
@@ -93,12 +93,18 @@
 	return tolm;
 }
 
+#if HAVE_HIGH_TABLES==1
+#define HIGH_TABLES_SIZE 64	// maximum size of high tables in KB
+extern uint64_t high_tables_base, high_tables_size;
+#endif
+uint64_t uma_memory_base=0, uma_memory_size=0;
+
 static void pci_domain_set_resources(device_t dev)
 {
 	uint32_t pci_tolm;
 	uint8_t tolud, reg8;
 	uint16_t reg16;
-	unsigned long long tomk, tolmk;
+	unsigned long long tomk;
 
 	pci_tolm = find_pci_tolm(&dev->link[0]);
 
@@ -120,13 +126,13 @@
 		switch (reg8) {
 		case 0:
 			tseg_size = 1024;
-			break;	
+			break;	/* TSEG = 1M */
 		case 1:
 			tseg_size = 2048;
-			break;	
+			break;	/* TSEG = 2M */
 		case 2:
 			tseg_size = 8192;
-			break;	
+			break;	/* TSEG = 8M */
 		}
 
 		printk_debug("%dM\n", tseg_size >> 10);
@@ -150,24 +156,32 @@
 
 		printk_debug("%dM UMA\n", uma_size >> 10);
 		tomk -= uma_size;
+
+		/* For reserving UMA memory in the memory map */
+		uma_memory_base = tomk * 1024ULL;
+		uma_memory_size = uma_size * 1024ULL;
 	}
 
 	/* The following needs to be 2 lines, otherwise the second
 	 * number is always 0
 	 */
-	printk_info("Available memory: %dK", tomk);
-	printk_info(" (%dM)\n", (tomk >> 10));
+	printk_info("Available memory: %dK", (uint32_t)tomk);
+	printk_info(" (%dM)\n", (uint32_t)(tomk >> 10));
 
-	tolmk = tomk;
-
 	/* Report the memory regions */
 	ram_resource(dev, 3, 0, 640);
-	ram_resource(dev, 4, 768, (tolmk - 768));
+	ram_resource(dev, 4, 768, (tomk - 768));
 	if (tomk > 4 * 1024 * 1024) {
 		ram_resource(dev, 5, 4096 * 1024, tomk - 4 * 1024 * 1024);
 	}
 
 	assign_resources(&dev->link[0]);
+
+#if HAVE_HIGH_TABLES==1
+	/* Leave some space for ACPI, PIRQ and MP tables */
+	high_tables_base = (tomk - HIGH_TABLES_SIZE) * 1024;
+	high_tables_size = HIGH_TABLES_SIZE * 1024;
+#endif
 }
 
 static unsigned int pci_domain_scan_bus(device_t dev, unsigned int max)
Index: src/arch/i386/boot/tables.c
===================================================================
--- src/arch/i386/boot/tables.c	(revision 3886)
+++ src/arch/i386/boot/tables.c	(working copy)
@@ -1,3 +1,22 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) .... others
+ * Copyright (C) 2008-2009 coresystems GmbH
+ *
+ * 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
+ */
 
 /* 2006.1 yhlu add mptable cross 0x467 processing */
 
@@ -38,11 +57,32 @@
 	printk_debug("ok\n");
 }
 
+#if HAVE_HIGH_TABLES == 1
+uint64_t high_tables_base = 0;
+uint64_t high_tables_size;
+#endif
+
 struct lb_memory *write_tables(void)
 {
 	unsigned long low_table_start, low_table_end, new_low_table_end;
 	unsigned long rom_table_start, rom_table_end;
 
+#if HAVE_HIGH_TABLES == 1
+	/* Even if high tables are configured, all tables are copied both to the
+	 * low and the high area, so payloads and OSes don't need to know about
+	 * the high tables.
+	 */
+	unsigned long high_table_start, high_table_end=0;
+
+	if (high_tables_base) {
+		printk_debug("High Tables Base is %lx.\n", high_tables_base);
+		high_table_start = high_tables_base;
+		high_table_end = high_tables_base;
+	} else {
+		printk_debug("High Tables Base is not set.\n");
+	}
+#endif
+
 	rom_table_start = 0xf0000; 
 	rom_table_end =   0xf0000;
 	/* Start low addr at 16 bytes instead of 0 because of a buglet
@@ -53,24 +93,47 @@
 
 	post_code(0x9a);
 
+#if HAVE_LOW_TABLES == 1
 	/* This table must be betweeen 0xf0000 & 0x100000 */
 	rom_table_end = write_pirq_routing_table(rom_table_end);
 	rom_table_end = (rom_table_end + 1023) & ~1023;
+#endif
+#if HAVE_HIGH_TABLES == 1
+	if (high_tables_base) {
+		high_table_end = write_pirq_routing_table(high_table_end);
+		high_table_end = (high_table_end + 1023) & ~1023;
+	}
+#endif
 
 	/* Write ACPI tables */
 	/* write them in the rom area because DSDT can be large (8K on epia-m) which
 	 * pushes coreboot table out of first 4K if set up in low table area 
 	 */
+#if HAVE_LOW_TABLES == 1
 	rom_table_end = write_acpi_tables(rom_table_end);
 	rom_table_end = (rom_table_end+1023) & ~1023;
-
+#endif
+#if HAVE_HIGH_TABLES == 1
+	if (high_tables_base) {
+		high_table_end = write_acpi_tables(high_table_end);
+		high_table_end = (high_table_end+1023) & ~1023;
+	}
+#endif
 	/* copy the smp block to address 0 */
 	post_code(0x96);
 
 	/* The smp table must be in 0-1K, 639K-640K, or 960K-1M */
+#if HAVE_LOW_TABLES == 1
 	new_low_table_end = write_smp_table(low_table_end); // low_table_end is 0x10 at this point
+#endif
+#if HAVE_HIGH_TABLES == 1
+	if (high_tables_base) {
+		high_table_end = write_smp_table(high_table_end);
+		high_table_end = (high_table_end+1023) & ~1023;
+	}
+#endif
 
-#if HAVE_MP_TABLE==1
+#if HAVE_MP_TABLE == 1
         /* Don't write anything in the traditional x86 BIOS data segment,
          * for example the linux kernel smp need to use 0x467 to pass reset vector
          * or use 0x40e/0x413 for EBDA finding...
@@ -104,8 +167,18 @@
 	}
 
 	// Relocate the GDT to reserved memory, so it won't get clobbered
-	move_gdt(low_table_end);
-	low_table_end += &gdt_end - &gdt;
+#if HAVE_HIGH_TABLES == 1
+	if (high_tables_base) {
+		move_gdt(high_table_end);
+		high_table_end += &gdt_end - &gdt;
+		high_table_end = (high_table_end+1023) & ~1023;
+	} else {
+#endif
+		move_gdt(low_table_end);
+		low_table_end += &gdt_end - &gdt;
+#if HAVE_HIGH_TABLES == 1
+	}
+#endif
 
 #if CONFIG_MULTIBOOT
 	/* The Multiboot information structure */
@@ -119,5 +192,23 @@
 	write_coreboot_table(low_table_start, low_table_end,
 			      rom_table_start, rom_table_end);
 
+#if 0 && HAVE_HIGH_TABLES == 1
+	/* This is currently broken and should be severely refactored. Ideally
+	 * we only have a pointer to the coreboot table in the low memory, so
+	 * anyone can find the real position.
+	 * write_coreboot_table does a lot more than just writing the coreboot
+	 * table. It magically decides where the table should go, and therefore
+	 * it consumes two base addresses. If we call write_coreboot_table like
+	 * below, we get weird effects.
+	 */
+	/* And we want another copy in high area because the low area might be
+	 * corrupted
+	 */
+	if (high_tables_base) {
+		write_coreboot_table(high_table_start, high_table_end,
+				      high_table_start, high_table_end);
+	}
+#endif
+ 
 	return get_lb_mem();
 }
