This patch adds "high coreboot table support" to coreboot version 2
Some bootloaders seem to overwrite memory starting at 0x600, thus destroying
the coreboot table integrity, rendering the table useless.
By moving the table to the high tables area (if it's activated), this problem
is fixed.
In order to move the table, a 40 bytes mini coreboot table with a single sub
table is placed at 0x500/0x530 that points to the real coreboot table. This is
comparable to the ACPI RSDT or the MP floating table.
This patch also adds "table forward" support to flashrom and nvramtool.
Corresponding to flashrom svn r421 and coreboot v2 svn r4012.
Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Peter Stuge <peter@stuge.se>
diff --git a/cbtable.c b/cbtable.c
index 2a3f2a7..4aa260b 100644
--- a/cbtable.c
+++ b/cbtable.c
@@ -4,7 +4,7 @@
* Copyright (C) 2002 Steven James <pyro@linuxlabs.com>
* Copyright (C) 2002 Linux Networx
* (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
- * Copyright (C) 2006-2007 coresystems GmbH
+ * Copyright (C) 2006-2009 coresystems GmbH
* (Written by Stefan Reinauer <stepan@coresystems.de> for coresystems GmbH)
*
* This program is free software; you can redistribute it and/or modify
@@ -124,7 +124,7 @@
head->table_checksum);
continue;
}
- fprintf(stdout, "Found coreboot table at 0x%08lx.\n", addr);
+ printf_debug("Found coreboot table at 0x%08lx.\n", addr);
return head;
};
@@ -181,9 +181,10 @@
}
}
+#define BYTES_TO_MAP (1024*1024)
int coreboot_init(void)
{
- uint8_t *low_1MB;
+ uint8_t *table_area;
unsigned long addr, start;
struct lb_header *lb_table;
struct lb_record *rec, *last;
@@ -196,18 +197,31 @@
#else
start = 0x0;
#endif
- low_1MB = physmap("low megabyte", start, 1024*1024);
+ table_area = physmap("low megabyte", start, BYTES_TO_MAP);
- lb_table = find_lb_table(low_1MB, 0x00000, 0x1000);
+ lb_table = find_lb_table(table_area, 0x00000, 0x1000);
if (!lb_table)
- lb_table = find_lb_table(low_1MB, 0xf0000, 1024*1024);
+ lb_table = find_lb_table(table_area, 0xf0000, BYTES_TO_MAP);
+ if (lb_table) {
+ struct lb_forward *forward = (struct lb_forward *)
+ (((char *)lb_table) + lb_table->header_bytes);
+ if (forward->tag == LB_TAG_FORWARD) {
+ start = forward->forward;
+ start &= ~(getpagesize()-1);
+ physunmap(table_area, BYTES_TO_MAP);
+ table_area = physmap("high tables", start, BYTES_TO_MAP);
+ lb_table = find_lb_table(table_area, 0x00000, 0x1000);
+ }
+ }
+
if (!lb_table) {
printf("No coreboot table found.\n");
return -1;
}
- addr = ((char *)lb_table) - ((char *)low_1MB) + start;
- printf_debug("coreboot table found at %p.\n", lb_table + start);
+ addr = ((char *)lb_table) - ((char *)table_area) + start;
+ fprintf(stdout, "coreboot table found at 0x%lx.\n",
+ (unsigned long)lb_table - (unsigned long)table_area + start);
rec = (struct lb_record *)(((char *)lb_table) + lb_table->header_bytes);
last = (struct lb_record *)(((char *)rec) + lb_table->table_bytes);
printf_debug("coreboot header(%d) checksum: %04x table(%d) checksum: %04x entries: %d\n",