intel/nehalem,sandybridge: Move stage_cache support function

Let garbage-collection take care of stage_cache_external_region()
if it is no needed and move implementation to a suitable file already
building for needed stages.

Remove aliasing CONFIG_RESERVED_SMM_SIZE as RESERVED_SMM_SIZE and
(unused) aliasing of CONFIG_IED_REGION_SIZE as IED_SIZE.

Change-Id: Idf00ba3180d8c3bc974dd3c5ca5f98a6c08bf34d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34672
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/nehalem/nehalem.h

@@ -122,9 +122,6 @@ typedef struct {
 #define IVB_STEP_K0	(BASE_REV_IVB + 5)
 #define IVB_STEP_D0	(BASE_REV_IVB + 6)
 
-/* Intel Enhanced Debug region must be 4MB */
-#define IED_SIZE	0x400000
-
 /* Northbridge BARs */
 #ifndef __ACPI__
 #define DEFAULT_MCHBAR		((u8 *)0xfed10000)	/* 16 KB */

src/northbridge/intel/nehalem/northbridge.c

@@ -171,11 +171,6 @@ static void mc_read_resources(struct device *dev)
 	add_fixed_resources(dev, 10);
 }
 
-u32 northbridge_get_tseg_size(void)
-{
-	return CONFIG_SMM_TSEG_SIZE;
-}
-
 static void mc_set_resources(struct device *dev)
 {
 	/* And call the normal set_resources */

src/northbridge/intel/nehalem/ram_calc.c

@@ -23,6 +23,7 @@
 #include <cpu/intel/romstage.h>
 #include <cpu/x86/mtrr.h>
 #include <program_loading.h>
+#include <stage_cache.h>
 #include <cpu/intel/smm/gen1/smi.h>
 #include "nehalem.h"
 
@@ -38,11 +39,25 @@ u32 northbridge_get_tseg_base(void)
 	return (u32)smm_region_start();
 }
 
+u32 northbridge_get_tseg_size(void)
+{
+	return CONFIG_SMM_TSEG_SIZE;
+}
+
 void *cbmem_top(void)
 {
 	return (void *) smm_region_start();
 }
 
+void stage_cache_external_region(void **base, size_t *size)
+{
+	/* The stage cache lives at the end of TSEG region.
+	 * The top of RAM is defined to be the TSEG base address. */
+	*size = CONFIG_SMM_RESERVED_SIZE;
+	*base = (void *)((uintptr_t)northbridge_get_tseg_base() +
+			northbridge_get_tseg_size() - CONFIG_SMM_RESERVED_SIZE);
+}
+
 /* platform_enter_postcar() determines the stack to use after
  * cache-as-ram is torn down as well as the MTRR settings to use,
  * and continues execution in postcar stage. */

src/northbridge/intel/sandybridge/northbridge.c

@@ -444,28 +444,6 @@ static void northbridge_init(struct device *dev)
 	MCHBAR32(0x5500) = 0x00100001;
 }
 
-static u32 northbridge_get_base_reg(struct device *dev, int reg)
-{
-	u32 value;
-
-	value = pci_read_config32(dev, reg);
-	/* Base registers are at 1MiB granularity. */
-	value &= ~((1 << 20) - 1);
-	return value;
-}
-
-u32 northbridge_get_tseg_base(void)
-{
-	struct device *dev = pcidev_on_root(0, 0);
-
-	return northbridge_get_base_reg(dev, TSEG);
-}
-
-u32 northbridge_get_tseg_size(void)
-{
-	return CONFIG_SMM_TSEG_SIZE;
-}
-
 void northbridge_write_smram(u8 smram)
 {
 	pci_write_config8(pcidev_on_root(0, 0), SMRAM, smram);

src/northbridge/intel/sandybridge/ram_calc.c

@@ -20,17 +20,12 @@
 #include <cbmem.h>
 #include <console/console.h>
 #include <cpu/intel/romstage.h>
+#include <cpu/intel/smm/gen1/smi.h>
 #include <cpu/x86/mtrr.h>
 #include <program_loading.h>
+#include <stage_cache.h>
 #include "sandybridge.h"
 
-#if (CONFIG_SMM_TSEG_SIZE < 0x800000)
-# error "CONFIG_SMM_TSEG_SIZE must at least be 8MiB"
-#endif
-#if ((CONFIG_SMM_TSEG_SIZE & (CONFIG_SMM_TSEG_SIZE - 1)) != 0)
-# error "CONFIG_SMM_TSEG_SIZE is not a power of 2"
-#endif
-
 static uintptr_t smm_region_start(void)
 {
 	/* Base of TSEG is top of usable DRAM */
@@ -43,6 +38,25 @@ void *cbmem_top(void)
 	return (void *) smm_region_start();
 }
 
+u32 northbridge_get_tseg_base(void)
+{
+	return ALIGN_DOWN(smm_region_start(), 1*MiB);
+}
+
+u32 northbridge_get_tseg_size(void)
+{
+	return CONFIG_SMM_TSEG_SIZE;
+}
+
+void stage_cache_external_region(void **base, size_t *size)
+{
+	/* The stage cache lives at the end of TSEG region.
+	 * The top of RAM is defined to be the TSEG base address. */
+	*size = CONFIG_SMM_RESERVED_SIZE;
+	*base = (void *)((uintptr_t)northbridge_get_tseg_base() + northbridge_get_tseg_size()
+			- CONFIG_IED_REGION_SIZE - CONFIG_SMM_RESERVED_SIZE);
+}
+
 /* platform_enter_postcar() determines the stack to use after
  * cache-as-ram is torn down as well as the MTRR settings to use,
  * and continues execution in postcar stage. */

src/northbridge/intel/sandybridge/sandybridge.h

@@ -34,10 +34,6 @@
 #define IVB_STEP_K0	(BASE_REV_IVB + 5)
 #define IVB_STEP_D0	(BASE_REV_IVB + 6)
 
-/* Intel Enhanced Debug region must be 4MB */
-
-#define IED_SIZE	CONFIG_IED_REGION_SIZE
-
 /* Northbridge BARs */
 #ifndef __ACPI__
 #define DEFAULT_MCHBAR		((u8 *)0xfed10000)	/* 16 KB */