ramstage: prepare for relocation
The current ramstage code contains uses of symbols that cause issues
when the ramstage is relocatable. There are 2 scenarios resolved by this
patch:
1. Absolute symbols that are actually sizes/limits. The symbols are
problematic when relocating a program because there is no way to
distinguish a symbol that shouldn't be relocated and one that can.
The only way to handle these symbols is to write a program to post
process the relocations and keep a whitelist of ones that shouldn't
be relocated. I don't believe that is a route that should be taken
so fix the users of these sizes/limits encoded as absolute symbols
to calculate the size at runtime or dereference a variable in memory
containing the size/limit.
2. Absoulte symbols that were relocated to a fixed address. These
absolute symbols are generated by assembly files to be placed at a
fixed location. Again, these symbols are problematic because one
can't distinguish a symbol that can't be relocated. The symbols
are again resolved at runtime to allow for proper relocation.
For the symbols defining a size either use 2 symbols and calculate the
difference or provide a variable in memory containing the size.
Change-Id: I1ef2bfe6fd531308218bcaac5dcccabf8edf932c
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/2789
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
diff --git a/src/arch/x86/boot/acpi.c b/src/arch/x86/boot/acpi.c
index fc862f4..327d175 100644
--- a/src/arch/x86/boot/acpi.c
+++ b/src/arch/x86/boot/acpi.c
@@ -754,7 +754,8 @@
void (*acpi_do_wakeup)(u32 vector, u32 backup_source, u32 backup_target,
u32 backup_size) asmlinkage = (void *)WAKEUP_BASE;
-extern unsigned char __wakeup, __wakeup_size;
+extern unsigned char __wakeup;
+extern unsigned int __wakeup_size;
void acpi_jump_to_wakeup(void *vector)
{
@@ -776,7 +777,7 @@
#endif
/* Copy wakeup trampoline in place. */
- memcpy((void *)WAKEUP_BASE, &__wakeup, (size_t)&__wakeup_size);
+ memcpy((void *)WAKEUP_BASE, &__wakeup, __wakeup_size);
#if CONFIG_COLLECT_TIMESTAMPS
timestamp_add_now(TS_ACPI_WAKE_JUMP);