cpu/x86/mp_init.c: Copy the stub parameter start32_offset into ramstage

Keep a copy of start32_offset into ramstage to avoid needing to pass
arguments, calling from assembly. Doing this in C code is better than
assembly.

Change-Id: Iac04358e377026f45293bbee03e30d792df407fd
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50765
Reviewed-by: Eugene Myers <cedarhouse1@comcast.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c
index e70c142cc5..26b1ccabe2 100644
--- a/src/cpu/x86/mp_init.c
+++ b/src/cpu/x86/mp_init.c
@@ -686,6 +686,7 @@ struct mp_state {
 	uintptr_t perm_smbase;
 	size_t perm_smsize;
 	size_t smm_save_state_size;
+	uintptr_t reloc_start32_offset;
 	int do_smm;
 } mp_state;
 
@@ -755,7 +756,7 @@ static void asmlinkage smm_do_relocation(void *arg)
 		stm_setup(mseg, p->cpu,
 				perm_smbase,
 				mp_state.perm_smbase,
-				runtime->start32_offset);
+				mp_state.reloc_start32_offset);
 	}
 }
 
@@ -796,6 +797,8 @@ static int install_relocation_handler(int num_cpus, size_t save_state_size)
 	}
 	adjust_smm_apic_id_map(&smm_params);
 
+	mp_state.reloc_start32_offset = smm_params.stub_params->start32_offset;
+
 	return 0;
 }