Change in coreboot[master]: cpu/intel/smm: Don't make assumptions on TSEG_SIZE

[Arthur Heymans (Code Review)]

Arthur Heymans has uploaded this change for review. ( https://review.coreboot.org/27872

Change subject: cpu/intel/smm: Don't make assumptions on TSEG_SIZE
......................................................................

cpu/intel/smm: Don't make assumptions on TSEG_SIZE

Do not assume:
- TSEG is 8M
- IED_REGION_SIZE is set (not needed on older platforms).

Change-Id: I1aadc6f0459a8035864dcf02b0a07e00b284fe2a
Signed-off-by: Arthur Heymans 
---
M src/cpu/intel/smm/gen1/smmrelocate.c
1 file changed, 21 insertions(+), 10 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/72/27872/1

diff --git a/src/cpu/intel/smm/gen1/smmrelocate.c b/src/cpu/intel/smm/gen1/smmrelocate.c
index a298985..aa689f0 100644
--- a/src/cpu/intel/smm/gen1/smmrelocate.c
+++ b/src/cpu/intel/smm/gen1/smmrelocate.c
@@ -16,6 +16,7 @@
 /* SMM relocation with intention to work for i945-ivybridge.
    Right now used for sandybridge and ivybridge.  */

+#include <assert.h>
 #include <types.h>
 #include <string.h>
 #include <compiler.h>
@@ -125,10 +126,15 @@
     * size * CPU num. */
    save_state->smbase = relo_params->smram_base -
    		     cpu * runtime->save_state_size;
-	save_state->iedbase = relo_params->ied_base;
+	if (CONFIG_IED_REGION_SIZE != 0) {
+		save_state->iedbase = relo_params->ied_base;

-	printk(BIOS_DEBUG, "New SMBASE=0x%08x IEDBASE=0x%08x @ %p\n",
-	       save_state->smbase, save_state->iedbase, save_state);
+		printk(BIOS_DEBUG, "New SMBASE=0x%08x IEDBASE=0x%08x @ %p\n",
+		       save_state->smbase, save_state->iedbase, save_state);
+	} else {
+		printk(BIOS_DEBUG, "New SMBASE=0x%08x @ %p\n",
+		       save_state->smbase, save_state);
+	}

/* Write SMRR MSRs based on indicated support. */
    mtrr_cap = rdmsr(MTRR_CAP_MSR);
@@ -149,16 +155,20 @@
       configuration value instead. */
    const u32 tseg_size = northbridge_get_tseg_size();

-	/* The SMRAM available to the handler is 4MiB
-	   since the IEDRAM lives at TSEGMB + 4MiB. */
    params->smram_base = tsegmb;
-	params->smram_size = 4 << 20;
-	params->ied_base = tsegmb + params->smram_size;
-	params->ied_size = tseg_size - params->smram_size;
+	params->smram_size = tseg_size;
+	if (CONFIG_IED_REGION_SIZE != 0) {
+		ASSERT(CONFIG_IED_REGION_SIZE > params->smram_size);
+		params->smram_size -= CONFIG_IED_REGION_SIZE;
+		params->ied_base = tsegmb + tseg_size - CONFIG_IED_REGION_SIZE;
+		params->ied_size = CONFIG_IED_REGION_SIZE;
+	}

/* Adjust available SMM handler memory size. */
-	if (IS_ENABLED(CONFIG_CACHE_RELOCATED_RAMSTAGE_OUTSIDE_CBMEM))
+	if (IS_ENABLED(CONFIG_CACHE_RELOCATED_RAMSTAGE_OUTSIDE_CBMEM)) {
+		ASSERT(CONFIG_SMM_RESERVED_SIZE > params->smram_size);
    	params->smram_size -= CONFIG_SMM_RESERVED_SIZE;
+	}

if (IS_ALIGNED(tsegmb, tseg_size)) {
    	/* SMRR has 32-bits of valid address aligned to 4KiB. */
@@ -264,7 +274,8 @@
    /* enable the SMM memory window */
    northbridge_write_smram(D_OPEN | G_SMRAME | C_BASE_SEG);

-	setup_ied_area(&smm_reloc_params);
+	if (CONFIG_IED_REGION_SIZE != 0)
+		setup_ied_area(&smm_reloc_params);

num_cpus = cpu_get_apic_id_map(apic_id_map);
    if (num_cpus > CONFIG_MAX_CPUS) {