aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--src/arch/x86/init/romstage.ld12
-rw-r--r--src/cpu/Makefile.inc1
-rw-r--r--src/cpu/x86/Kconfig9
-rw-r--r--src/cpu/x86/Makefile.inc1
-rw-r--r--src/cpu/x86/car.c101
-rw-r--r--src/include/cbmem.h1
-rw-r--r--src/include/cpu/x86/car.h29
-rw-r--r--src/lib/cbmem.c4
-rw-r--r--src/lib/cbmem_info.c1
-rw-r--r--src/lib/dynamic_cbmem.c9
10 files changed, 168 insertions, 0 deletions
diff --git a/src/arch/x86/init/romstage.ld b/src/arch/x86/init/romstage.ld
index 88c56573ae..f44185f24e 100644
--- a/src/arch/x86/init/romstage.ld
+++ b/src/arch/x86/init/romstage.ld
@@ -35,6 +35,10 @@ SECTIONS
*(.rodata.*);
*(.rom.data.*);
. = ALIGN(16);
+ _car_migrate_start = .;
+ *(.car.migrate);
+ _car_migrate_end = .;
+ . = ALIGN(16);
_erom = .;
}
@@ -48,8 +52,16 @@ SECTIONS
. = CONFIG_DCACHE_RAM_BASE;
.car.data . (NOLOAD) : {
+ _car_data_start = .;
*(.car.global_data);
+ /* The cbmem_console section comes last to take advantage of
+ * a zero-sized array to hold the memconsole contents that
+ * grows to a bound of CONFIG_CONSOLE_CAR_BUFFER_SIZE. However,
+ * collisions within the cache-as-ram region cannot be
+ * statically checked because the cache-as-ram region usage is
+ * cpu/chipset dependent. */
*(.car.cbmem_console);
+ _car_data_end = .;
}
_bogus = ASSERT((SIZEOF(.car.data) <= CONFIG_DCACHE_RAM_SIZE), "Cache as RAM area is too full");
diff --git a/src/cpu/Makefile.inc b/src/cpu/Makefile.inc
index b48a803795..8d93756390 100644
--- a/src/cpu/Makefile.inc
+++ b/src/cpu/Makefile.inc
@@ -6,6 +6,7 @@ subdirs-y += armltd
subdirs-y += intel
subdirs-y += samsung
subdirs-y += via
+subdirs-y += x86
################################################################################
## Rules for building the microcode blob in CBFS
diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig
index c64a8e477b..c10dd1579f 100644
--- a/src/cpu/x86/Kconfig
+++ b/src/cpu/x86/Kconfig
@@ -115,3 +115,12 @@ config X86_AMD_FIXED_MTRRS
help
This option informs the MTRR code to use the RdMem and WrMem fields
in the fixed MTRR MSRs.
+
+config CAR_MIGRATION
+ def_bool n
+ depends on DYNAMIC_CBMEM || EARLY_CBMEM_INIT
+ help
+ Migrate the cache-as-ram variables to CBMEM once CBMEM is set up
+ in romstage. This option is only needed if one will be doing more
+ work in romstage after the cache-as-ram is torn down aside from
+ loading ramstage.
diff --git a/src/cpu/x86/Makefile.inc b/src/cpu/x86/Makefile.inc
new file mode 100644
index 0000000000..fe8648cc49
--- /dev/null
+++ b/src/cpu/x86/Makefile.inc
@@ -0,0 +1 @@
+romstage-$(CONFIG_CAR_MIGRATION) += car.c
diff --git a/src/cpu/x86/car.c b/src/cpu/x86/car.c
new file mode 100644
index 0000000000..31fc67c57a
--- /dev/null
+++ b/src/cpu/x86/car.c
@@ -0,0 +1,101 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <string.h>
+#include <stddef.h>
+#include <console/console.h>
+#include <cbmem.h>
+#include <cpu/x86/car.h>
+
+typedef void (* const car_migration_func_t)(void);
+
+extern car_migration_func_t _car_migrate_start;
+extern car_migration_func_t _car_migrate_end;
+
+extern char _car_data_start[];
+extern char _car_data_end[];
+
+/*
+ * The car_migrated global variable determines if the cache-as-ram space has
+ * been migrated to real RAM. It does this by asumming the following things:
+ * 1. cache-as-ram space is zero'd out once it is set up.
+ * 2. Either the cache-as-ram space is memory-backed after getting torn down
+ * or the space returns 0xff's for each byte read.
+ * Based on these 2 attributes there is the ability to tell when the
+ * cache-as-ram region has been migrated.
+ */
+static int car_migrated CAR_GLOBAL;
+
+
+void *car_get_var_ptr(void *var)
+{
+ char *migrated_base;
+ int offset;
+ void * _car_start = &_car_data_start;
+ void * _car_end = &_car_data_end;
+
+ /* If the cache-as-ram has not been migrated return the pointer
+ * passed in. */
+ if (!car_migrated)
+ return var;
+
+ if (var < _car_start || var >= _car_end) {
+ printk(BIOS_ERR,
+ "Requesting CAR variable outside of CAR region: %p\n",
+ var);
+ return var;
+ }
+
+ migrated_base = cbmem_find(CBMEM_ID_CAR_GLOBALS);
+
+ if (migrated_base == NULL) {
+ printk(BIOS_ERR, "CAR: Could not find migration base!\n");
+ return var;
+ }
+
+ offset = (char *)var - (char *)_car_start;
+
+ return &migrated_base[offset];
+}
+
+void car_migrate_variables(void)
+{
+ void *migrated_base;
+ car_migration_func_t *migrate_func;
+ size_t car_data_size = &_car_data_end[0] - &_car_data_start[0];
+
+ migrated_base = cbmem_add(CBMEM_ID_CAR_GLOBALS, car_data_size);
+
+ if (migrated_base == NULL) {
+ printk(BIOS_ERR, "Could not migrate CAR data!\n");
+ return;
+ }
+
+ memcpy(migrated_base, &_car_data_start[0], car_data_size);
+
+ /* Mark that the data has been moved. */
+ car_migrated = ~0;
+
+ /* Call all the migration functions. */
+ migrate_func = &_car_migrate_start;
+ while (migrate_func != &_car_migrate_end) {
+ (*migrate_func)();
+ migrate_func++;
+ }
+}
diff --git a/src/include/cbmem.h b/src/include/cbmem.h
index 67cb1cb7e5..baec780156 100644
--- a/src/include/cbmem.h
+++ b/src/include/cbmem.h
@@ -69,6 +69,7 @@
#define CBMEM_ID_RAMSTAGE_CACHE 0x9a3ca54e
#define CBMEM_ID_ROOT 0xff4007ff
#define CBMEM_ID_VBOOT_HANDOFF 0x780074f0
+#define CBMEM_ID_CAR_GLOBALS 0xcac4e6a3
#define CBMEM_ID_NONE 0x00000000
#ifndef __ASSEMBLER__
diff --git a/src/include/cpu/x86/car.h b/src/include/cpu/x86/car.h
index 2d2af03a37..7b5cedf213 100644
--- a/src/include/cpu/x86/car.h
+++ b/src/include/cpu/x86/car.h
@@ -28,4 +28,33 @@
#define CAR_CBMEM
#endif
+#if CONFIG_CAR_MIGRATION && defined(__PRE_RAM__)
+#define CAR_MIGRATE_ATTR __attribute__ ((used,section (".car.migrate")))
+
+/* Call migrate_fn_() when CAR globals are migrated. */
+#define CAR_MIGRATE(migrate_fn_) \
+ static void (* const migrate_fn_ ## _ptr)(void) CAR_MIGRATE_ATTR = \
+ migrate_fn_;
+
+/* Get the correct pointer for the CAR global variable. */
+void *car_get_var_ptr(void *var);
+
+/* Get and set a primitive type global variable. */
+#define car_get_var(var) \
+ *(typeof(var) *)car_get_var_ptr(&(var))
+#define car_set_var(var, val) \
+ do { car_get_var(var) = (val); } while(0)
+
+/* Migrate the CAR variables to memory. */
+void car_migrate_variables(void);
+
+#else
+#define CAR_MIGRATE(migrate_fn_)
+static inline void *car_get_var_ptr(void *var) { return var; }
+#define car_get_var(var) (var)
+#define car_set_var(var, val) do { (var) = (val); } while (0)
+static inline void car_migrate_variables(void) { }
+#endif
+
+
#endif
diff --git a/src/lib/cbmem.c b/src/lib/cbmem.c
index e8200b6045..3702da1e1d 100644
--- a/src/lib/cbmem.c
+++ b/src/lib/cbmem.c
@@ -22,6 +22,7 @@
#include <bootstate.h>
#include <cbmem.h>
#include <console/console.h>
+#include <cpu/x86/car.h>
#if CONFIG_HAVE_ACPI_RESUME && !defined(__PRE_RAM__)
#include <arch/acpi.h>
#endif
@@ -228,6 +229,9 @@ int cbmem_initialize(void)
#ifndef __PRE_RAM__
cbmem_arch_init();
#endif
+ /* Migrate cache-as-ram variables. */
+ car_migrate_variables();
+
return rv;
}
#endif
diff --git a/src/lib/cbmem_info.c b/src/lib/cbmem_info.c
index ad8c890666..7031a70d54 100644
--- a/src/lib/cbmem_info.c
+++ b/src/lib/cbmem_info.c
@@ -46,6 +46,7 @@ static struct cbmem_id_to_name {
{ CBMEM_ID_RAMSTAGE_CACHE, "RAMSTAGE $ " },
{ CBMEM_ID_ROOT, "CBMEM ROOT " },
{ CBMEM_ID_VBOOT_HANDOFF, "VBOOT " },
+ { CBMEM_ID_CAR_GLOBALS, "CAR GLOBALS" },
};
void cbmem_print_entry(int n, u32 id, u64 base, u64 size)
diff --git a/src/lib/dynamic_cbmem.c b/src/lib/dynamic_cbmem.c
index 5c269a0282..ba7760dcd1 100644
--- a/src/lib/dynamic_cbmem.c
+++ b/src/lib/dynamic_cbmem.c
@@ -23,6 +23,7 @@
#include <cbmem.h>
#include <string.h>
#include <stdlib.h>
+#include <cpu/x86/car.h>
#if CONFIG_HAVE_ACPI_RESUME && !defined(__PRE_RAM__)
#include <arch/acpi.h>
#endif
@@ -182,12 +183,17 @@ void cbmem_initialize_empty(void)
root, root->max_entries);
cbmem_arch_init();
+
+ /* Migrate cache-as-ram variables. */
+ car_migrate_variables();
}
static inline int cbmem_fail_recovery(void)
{
cbmem_initialize_empty();
cbmem_handle_acpi_resume();
+ /* Migrate cache-as-ram variables. */
+ car_migrate_variables();
return 1;
}
@@ -256,6 +262,9 @@ int cbmem_initialize(void)
cbmem_arch_init();
+ /* Migrate cache-as-ram variables. */
+ car_migrate_variables();
+
/* Recovery successful. */
return 0;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-05 01:22:20 +0000