cpu/x86/smm: Improve smm stack setup

Both the relocation handler and the permanent handler use the same
stacks, so things can be simplified.

Change-Id: I7bdca775550e8280757a6c5a5150a0d638d5fc2d
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58698
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

2 files changed, 8 insertions, 24 deletions

diff --git a/src/include/cpu/x86/mp.h b/src/include/cpu/x86/mp.h
index 934d217b78..1b4c956b59 100644
--- a/src/include/cpu/x86/mp.h
+++ b/src/include/cpu/x86/mp.h
@@ -45,17 +45,6 @@ struct mp_ops {
 	 */
 	void (*get_microcode_info)(const void **microcode, int *parallel);
 	/*
-	 * Optionally adjust SMM handler parameters to override the default
-	 * values.  The is_perm variable indicates if the parameters to adjust
-	 * are for the relocation handler or the permanent handler. This
-	 * function is therefore called twice -- once for each handler.
-	 * By default the parameters for each SMM handler are:
-	 *       stack_size     num_concurrent_stacks num_concurrent_save_states
-	 * relo: save_state_size    get_cpu_count()          1
-	 * perm: save_state_size    get_cpu_count()          get_cpu_count()
-	 */
-	void (*adjust_smm_params)(struct smm_loader_params *slp, int is_perm);
-	/*
 	 * Optionally provide a callback prior to the APs starting SMM
 	 * relocation or CPU driver initialization. However, note that
 	 * this callback is called after SMM handlers have been loaded.
@@ -92,13 +81,11 @@ struct mp_ops {
  * 3. get_smm_info()
  * 4. get_microcode_info()
  * 5. adjust_cpu_apic_entry() for each number of get_cpu_count()
- * 6. adjust_smm_params(is_perm = 0)
- * 7. adjust_smm_params(is_perm = 1)
- * 8. pre_mp_smm_init()
- * 9. per_cpu_smm_trigger() in parallel for all cpus which calls
+ * 6. pre_mp_smm_init()
+ * 7. per_cpu_smm_trigger() in parallel for all cpus which calls
  *    relocation_handler() in SMM.
- * 10. mp_initialize_cpu() for each cpu
- * 11. post_mp_init()
+ * 8. mp_initialize_cpu() for each cpu
+ * 9. post_mp_init()
  */
 enum cb_err mp_init_with_smm(struct bus *cpu_bus, const struct mp_ops *mp_ops);
 
diff --git a/src/include/cpu/x86/smm.h b/src/include/cpu/x86/smm.h
index 848996f845..37247ece49 100644
--- a/src/include/cpu/x86/smm.h
+++ b/src/include/cpu/x86/smm.h
@@ -120,9 +120,6 @@ static inline bool smm_points_to_smram(const void *ptr, const size_t len)
 /* SMM Module Loading API */
 
 /* The smm_loader_params structure provides direction to the SMM loader:
- * - stack_top - optional external stack provided to loader. It must be at
- *               least per_cpu_stack_size * num_concurrent_stacks in size.
- * - per_cpu_stack_size - stack size per CPU for smm modules.
  * - num_concurrent_stacks - number of concurrent cpus in handler needing stack
  *                           optional for setting up relocation handler.
  * - per_cpu_save_state_size - the SMM save state size per cpu
@@ -135,8 +132,6 @@ static inline bool smm_points_to_smram(const void *ptr, const size_t len)
  *             handle sparse APIC id space.
  */
 struct smm_loader_params {
-	uintptr_t stack_top;
-	size_t per_cpu_stack_size;
 	size_t num_concurrent_stacks;
 
 	size_t real_cpu_save_state_size;
@@ -148,8 +143,10 @@ struct smm_loader_params {
 	struct smm_stub_params *stub_params;
 };
 
-/* Both of these return 0 on success, < 0 on failure. */
-int smm_setup_relocation_handler(const uintptr_t perm_smram, struct smm_loader_params *params);
+/* All of these return 0 on success, < 0 on failure. */
+int smm_setup_stack(const uintptr_t perm_smbase, const size_t perm_smram_size,
+		    const unsigned int total_cpus, const size_t stack_size);
+int smm_setup_relocation_handler(struct smm_loader_params *params);
 int smm_load_module(uintptr_t smram_base, size_t smram_size, struct smm_loader_params *params);
 
 u32 smm_get_cpu_smbase(unsigned int cpu_num);