Make AMD SMM SMP aware

Move the SMM MSR init to a code run per CPU. Introduce global SMM_BASE define,
later all 0xa0000 could be changed to use it. Remove the unnecessary test if
the smm_init routine is called once (it is called by BSP only) and also remove
if lock bit is set becuase this bit is cleared by INIT it seems.
Add the defines for fam10h and famfh to respective files, we do not have any
shared AMD MSR header file.

Tested on M2V-MX SE with dualcore CPU.

Change-Id: I1b2bf157d1cc79c566c9089689a9bfd9310f5683
Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Reviewed-on: http://review.coreboot.org/82
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 43 insertions, 81 deletions

diff --git a/src/cpu/amd/smm/smm_init.c b/src/cpu/amd/smm/smm_init.c
index ad1c112ed0..6398688c48 100644
--- a/src/cpu/amd/smm/smm_init.c
+++ b/src/cpu/amd/smm/smm_init.c
@@ -30,94 +30,56 @@
 #include <cpu/x86/smm.h>
 #include <string.h>
 
-#define SMM_BASE_MSR 0xc0010111
-#define SMM_ADDR_MSR 0xc0010112
-#define SMM_MASK_MSR 0xc0010113
-#define SMM_BASE 0xa0000
-
 extern unsigned char _binary_smm_start;
 extern unsigned char _binary_smm_size;
 
-static int smm_handler_copied = 0;
-
 void smm_init(void)
 {
-	msr_t msr;
-
-	msr = rdmsr(HWCR_MSR);
-	if (msr.lo & (1 << 0)) {
-		// This sounds like a bug... ? 
-		printk(BIOS_DEBUG, "SMM is still locked from last boot, using old handler.\n");
-		return;
-	}
-
-	/* Only copy SMM handler once, not once per CPU */
-	if (!smm_handler_copied) {
-		msr_t syscfg_orig, mtrr_aseg_orig;
-
-		smm_handler_copied = 1;
-
-		/* Back up MSRs for later restore */
-		syscfg_orig = rdmsr(SYSCFG_MSR);
-		mtrr_aseg_orig = rdmsr(MTRRfix16K_A0000_MSR);
-
-		/* MTRR changes don't like an enabled cache */
-		disable_cache();
-
-		msr = syscfg_orig;
-		/* Allow changes to MTRR extended attributes */
-		msr.lo |= SYSCFG_MSR_MtrrFixDramModEn;
-		/* turn the extended attributes off until we fix
-		 * them so A0000 is routed to memory
-		 */
-		msr.lo &= ~SYSCFG_MSR_MtrrFixDramEn;
-		wrmsr(SYSCFG_MSR, msr);
-
-		/* set DRAM access to 0xa0000 */
-		/* A0000 is memory */
-		msr.lo = 0x18181818;
-		msr.hi = 0x18181818;
-		wrmsr(MTRRfix16K_A0000_MSR, msr);
-
-		/* enable the extended features */
-		msr = syscfg_orig;
-		msr.lo |= SYSCFG_MSR_MtrrFixDramModEn;
-		msr.lo |= SYSCFG_MSR_MtrrFixDramEn;
-		wrmsr(SYSCFG_MSR, msr);
-
-		enable_cache();
-		/* copy the real SMM handler */
-		memcpy((void *)SMM_BASE, &_binary_smm_start, (size_t)&_binary_smm_size);
-		wbinvd();
-
-		/* Restore MTRR */
-		disable_cache();
-
-		/* Restore SYSCFG */
-		wrmsr(SYSCFG_MSR, syscfg_orig);
-
-		wrmsr(MTRRfix16K_A0000_MSR, mtrr_aseg_orig);
-		enable_cache();
-	}
-
-
-	/* But set SMM base address on all CPUs/cores */
-	msr = rdmsr(SMM_BASE_MSR);
-	msr.lo = SMM_BASE - (lapicid() * 0x400);
-	wrmsr(SMM_BASE_MSR, msr);
-
-	/* enable the SMM memory window */
-	msr = rdmsr(SMM_MASK_MSR);
-	msr.lo |= (1 << 0); // Enable ASEG SMRAM Range
-	wrmsr(SMM_MASK_MSR, msr);
-
-	/* Set SMMLOCK to avoid exploits messing with SMM */
-	msr = rdmsr(HWCR_MSR);
-	msr.lo |= (1 << 0);
-	wrmsr(HWCR_MSR, msr);
+	msr_t msr, syscfg_orig, mtrr_aseg_orig;
+
+	/* Back up MSRs for later restore */
+	syscfg_orig = rdmsr(SYSCFG_MSR);
+	mtrr_aseg_orig = rdmsr(MTRRfix16K_A0000_MSR);
+
+	/* MTRR changes don't like an enabled cache */
+	disable_cache();
+
+	msr = syscfg_orig;
+
+	/* Allow changes to MTRR extended attributes */
+	msr.lo |= SYSCFG_MSR_MtrrFixDramModEn;
+	/* turn the extended attributes off until we fix
+	 * them so A0000 is routed to memory
+	 */
+	msr.lo &= ~SYSCFG_MSR_MtrrFixDramEn;
+	wrmsr(SYSCFG_MSR, msr);
+
+	/* set DRAM access to 0xa0000 */
+	msr.lo = 0x18181818;
+	msr.hi = 0x18181818;
+	wrmsr(MTRRfix16K_A0000_MSR, msr);
+
+	/* enable the extended features */
+	msr = syscfg_orig;
+	msr.lo |= SYSCFG_MSR_MtrrFixDramModEn;
+	msr.lo |= SYSCFG_MSR_MtrrFixDramEn;
+	wrmsr(SYSCFG_MSR, msr);
+
+	enable_cache();
+	/* copy the real SMM handler */
+	memcpy((void *)SMM_BASE, &_binary_smm_start, (size_t)&_binary_smm_size);
+	wbinvd();
+	disable_cache();
+
+	/* Restore SYSCFG and MTRR */
+	wrmsr(SYSCFG_MSR, syscfg_orig);
+	wrmsr(MTRRfix16K_A0000_MSR, mtrr_aseg_orig);
+	enable_cache();
+
+	/* CPU MSR are set in CPU init */
 }
 
 void smm_lock(void)
 {
-	/* We lock SMM per CPU core */
+	/* We lock SMM in CPU init */
 }