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authorKyösti Mälkki <kyosti.malkki@gmail.com>2019-08-22 09:44:44 +0300
committerKyösti Mälkki <kyosti.malkki@gmail.com>2019-08-26 22:52:10 +0000
commita165c07ed7ffdfc0d64eadb911a1cf576b26b0f0 (patch)
tree888e587fab34e184f8b9b363676ba913980f8418
parent19e1d631e3b93cf4553e003062934def5f091656 (diff)
downloadcoreboot-a165c07ed7ffdfc0d64eadb911a1cf576b26b0f0.tar.xz
arch/x86: Simplify <arch/early_variables.h>
This enables the use of .bss section for ENV_BOOTBLOCK and ENV_VERSTAGE even with CAR_GLOBAL_MIGRATION=y. In practice, boards with CAR_GLOBAL_MIGRATION=y currently build with romcc-bootblock so they will not be using .bss. Change-Id: Ie9dc14f3e528d3e4f48304f4d7de50df448a8af6 Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/35016 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org>
-rw-r--r--src/arch/x86/car.ld4
-rw-r--r--src/arch/x86/include/arch/early_variables.h54
-rw-r--r--src/cpu/x86/pae/pgtbl.c4
-rw-r--r--src/include/rules.h4
-rw-r--r--src/lib/program.ld2
5 files changed, 23 insertions, 45 deletions
diff --git a/src/arch/x86/car.ld b/src/arch/x86/car.ld
index 5351fc7bb8..641ae1f337 100644
--- a/src/arch/x86/car.ld
+++ b/src/arch/x86/car.ld
@@ -76,8 +76,8 @@
* cbmem console. This is useful for clearing this area on a per-stage
* basis when more than one stage uses cache-as-ram for CAR_GLOBALs. */
_car_global_start = .;
-#if !CONFIG(CAR_GLOBAL_MIGRATION)
- /* Allow global unitialized variables when CAR_GLOBALs are not used. */
+#if ENV_STAGE_HAS_BSS_SECTION
+ /* Allow global uninitialized variables for stages without CAR teardown. */
*(.bss)
*(.bss.*)
*(.sbss)
diff --git a/src/arch/x86/include/arch/early_variables.h b/src/arch/x86/include/arch/early_variables.h
index 4860e49b11..3910a820da 100644
--- a/src/arch/x86/include/arch/early_variables.h
+++ b/src/arch/x86/include/arch/early_variables.h
@@ -20,7 +20,8 @@
#include <commonlib/helpers.h>
#include <stdlib.h>
-#if ENV_CACHE_AS_RAM && CONFIG(CAR_GLOBAL_MIGRATION)
+#if ENV_ROMSTAGE && CONFIG(CAR_GLOBAL_MIGRATION)
+
asm(".section .car.global_data,\"w\",@nobits");
asm(".previous");
#ifdef __clang__
@@ -29,27 +30,6 @@ asm(".previous");
#define CAR_GLOBAL __attribute__((used, section(".car.global_data#")))
#endif /* __clang__ */
-/*
- * In stages that use CAR (verstage, C bootblock) all CAR_GLOBAL variables are
- * accessed unconditionally because cbmem is never initialized until romstage
- * when dram comes up.
- */
-#if !ENV_ROMSTAGE
-static inline void *car_get_var_ptr(void *var)
-{
- return var;
-}
-
-static inline void *car_sync_var_ptr(void *var)
-{
- return var;
-}
-
-static inline int car_active(void)
-{
- return 1;
-}
-#else
/* Get the correct pointer for the CAR global variable. */
void *car_get_var_ptr(void *var);
@@ -58,7 +38,6 @@ void *car_sync_var_ptr(void *var);
/* Return 1 when currently running with globals in Cache-as-RAM, 0 otherwise. */
int car_active(void);
-#endif /* !ENV_ROMSTAGE */
/* Get and set a primitive type global variable. */
#define car_get_var(var) \
@@ -81,26 +60,25 @@ static inline size_t car_object_offset(void *ptr)
#else
/*
- * We might end up here if:
- * 1. ENV_CACHE_AS_RAM is not set for the stage or
- * 2. ENV_CACHE_AS_RAM is set for the stage but CONFIG_CAR_GLOBAL_MIGRATION
- * is not set. In this case, there is no need to migrate CAR global
- * variables. But, since we might still be running out of CAR, car_active needs
- * to return 1 if ENV_CACHE_AS_RAM is set.
+ * For all stages other than romstage, all CAR_GLOBAL variables are accessed
+ * unconditionally as there is no migration of symbols.
*/
#define CAR_GLOBAL
-static inline void *car_get_var_ptr(void *var) { return var; }
-
-#if ENV_CACHE_AS_RAM
-static inline int car_active(void) { return 1; }
-#else
-static inline int car_active(void) { return 0; }
-#endif /* ENV_CACHE_AS_RAM */
-
#define car_get_var(var) (var)
#define car_sync_var(var) (var)
#define car_set_var(var, val) (var) = (val)
-#endif /* ENV_CACHE_AS_RAM && CONFIG(CAR_GLOBAL_MIGRATION) */
+
+static inline void *car_get_var_ptr(void *var)
+{
+ return var;
+}
+
+static inline int car_active(void)
+{
+ return ENV_CACHE_AS_RAM;
+}
+
+#endif
#endif /* ARCH_EARLY_VARIABLES_H */
diff --git a/src/cpu/x86/pae/pgtbl.c b/src/cpu/x86/pae/pgtbl.c
index f54a1c35db..4673de6296 100644
--- a/src/cpu/x86/pae/pgtbl.c
+++ b/src/cpu/x86/pae/pgtbl.c
@@ -363,7 +363,7 @@ static int read_from_cbfs(const char *name, void *buf, size_t size)
int paging_enable_for_car(const char *pdpt_name, const char *pt_name)
{
- if (!ENV_CACHE_AS_RAM)
+ if (!preram_symbols_available())
return -1;
if (read_from_cbfs(pdpt_name, _pdpt, REGION_SIZE(pdpt))) {
@@ -383,7 +383,7 @@ int paging_enable_for_car(const char *pdpt_name, const char *pt_name)
static void *get_pdpt_addr(void)
{
- if (ENV_CACHE_AS_RAM)
+ if (preram_symbols_available())
return _pdpt;
return (void *)(uintptr_t)read_cr3();
}
diff --git a/src/include/rules.h b/src/include/rules.h
index 8a6945b94c..9fd7dc32da 100644
--- a/src/include/rules.h
+++ b/src/include/rules.h
@@ -274,8 +274,8 @@
#define ENV_CACHE_AS_RAM ENV_ROMSTAGE_OR_BEFORE
/* No .data sections with execute-in-place from ROM. */
#define ENV_STAGE_HAS_DATA_SECTION !ENV_CACHE_AS_RAM
-/* No .bss sections with execute-in-place from ROM. */
-#define ENV_STAGE_HAS_BSS_SECTION !ENV_CACHE_AS_RAM
+/* No .bss sections for stage with CAR teardown. */
+#define ENV_STAGE_HAS_BSS_SECTION !(ENV_ROMSTAGE && CONFIG(CAR_GLOBAL_MIGRATION))
#else
/* Both .data and .bss, sometimes SRAM not DRAM. */
#define ENV_STAGE_HAS_DATA_SECTION 1
diff --git a/src/lib/program.ld b/src/lib/program.ld
index 1b30c0ebb6..ad364a4b0c 100644
--- a/src/lib/program.ld
+++ b/src/lib/program.ld
@@ -125,7 +125,7 @@
}
#endif
-#if ENV_STAGE_HAS_BSS_SECTION
+#if ENV_STAGE_HAS_BSS_SECTION && !ENV_CACHE_AS_RAM
.bss . : {
. = ALIGN(ARCH_POINTER_ALIGN_SIZE);
_bss = .;