Change in coreboot[master]: cpu/x86/{mp_init,smm}: Remove cpu member from smm_module_params

[Raul Rangel (Code Review)]

Raul Rangel has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/58148 )

Change subject: cpu/x86/{mp_init,smm}: Remove cpu member from smm_module_params
......................................................................

cpu/x86/{mp_init,smm}: Remove cpu member from smm_module_params

This value can now be obtained by using cpu_info(). This also allows us
to clean up the asm a bit too.

BUG=b:194391185, b:179699789
TEST=Boot guybrush to OS and verify all CPUs still function

Signed-off-by: Raul E Rangel 
Change-Id: I67b31b6f2aea9e255db01ab29bd9a55416f67a7d
---
M src/cpu/x86/mp_init.c
M src/cpu/x86/smm/smm_module_handler.c
M src/cpu/x86/smm/smm_stub.S
M src/include/cpu/x86/smm.h
4 files changed, 5 insertions(+), 13 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/48/58148/1

diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c
index 81ce101..8993d2d 100644
--- a/src/cpu/x86/mp_init.c
+++ b/src/cpu/x86/mp_init.c
@@ -720,14 +720,10 @@
  */
 static void asmlinkage smm_do_relocation(void *arg)
 {
-	const struct smm_module_params *p;
-	int cpu;
+	int cpu = cpu_info()->index;
    const uintptr_t curr_smbase = SMM_DEFAULT_BASE;
    uintptr_t perm_smbase;

-	p = arg;
-	cpu = p->cpu;
-
    if (cpu >= CONFIG_MAX_CPUS) {
    	printk(BIOS_CRIT,
    	       "Invalid CPU number assigned in SMM stub: %d\n", cpu);
@@ -756,7 +752,7 @@
    	mseg = mp_state.perm_smbase +
    		(mp_state.perm_smsize - CONFIG_MSEG_SIZE);

-		stm_setup(mseg, p->cpu,
+		stm_setup(mseg, cpu,
    			perm_smbase,
    			mp_state.perm_smbase,
    			mp_state.reloc_start32_offset);
diff --git a/src/cpu/x86/smm/smm_module_handler.c b/src/cpu/x86/smm/smm_module_handler.c
index f9ebba4..d04af40 100644
--- a/src/cpu/x86/smm/smm_module_handler.c
+++ b/src/cpu/x86/smm/smm_module_handler.c
@@ -119,12 +119,11 @@
 asmlinkage void smm_handler_start(void *arg)
 {
    const struct smm_module_params *p;
-	int cpu;
+	int cpu = cpu_info()->index;
    uintptr_t actual_canary;
    uintptr_t expected_canary;

p = arg;
-	cpu = p->cpu;
    expected_canary = (uintptr_t)p->canary;

/* Make sure to set the global runtime. It's OK to race as the value
diff --git a/src/cpu/x86/smm/smm_stub.S b/src/cpu/x86/smm/smm_stub.S
index 60bde99..3e7a158 100644
--- a/src/cpu/x86/smm/smm_stub.S
+++ b/src/cpu/x86/smm/smm_stub.S
@@ -211,7 +211,6 @@
    andl	$0xfffffff0, %esp

#if ENV_X86_64
-	mov	%ecx, %edi
    /* Backup IA32_EFER. Preserves ebx. */
    movl	$(IA32_EFER), %ecx
    rdmsr
@@ -220,7 +219,6 @@

/* entry64.inc preserves ebx, esi, edi */
 #include <cpu/x86/64bit/entry64.inc>
-	mov	%edi, %ecx

#endif

@@ -230,8 +228,8 @@
     *   c_handler(&arg)
     */
 #if ENV_X86_64
+	push	$0x0 /* Padding */
    push	%rbx /* uintptr_t *canary */
-	push	%rcx /* size_t cpu */

mov	%rsp, %rdi	/* *arg */

@@ -257,8 +255,8 @@

#else
    push	$0x0 /* Padding */
+	push	$0x0 /* Padding */
    push	%ebx /* uintptr_t *canary */
-	push	%ecx /* size_t cpu */
    push	%esp /* smm_module_params *arg (allocated on stack). */
    mov	c_handler, %eax
    call	*%eax
diff --git a/src/include/cpu/x86/smm.h b/src/include/cpu/x86/smm.h
index 08404d0..61c6e52 100644
--- a/src/include/cpu/x86/smm.h
+++ b/src/include/cpu/x86/smm.h
@@ -65,7 +65,6 @@
 } __packed;

struct smm_module_params {
-	size_t cpu;
    /* A canary value that has been placed at the end of the stack.
     * If (uintptr_t)canary != *canary then a stack overflow has occurred.
     */