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>
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@ -76,8 +76,8 @@
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* cbmem console. This is useful for clearing this area on a per-stage
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* basis when more than one stage uses cache-as-ram for CAR_GLOBALs. */
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_car_global_start = .;
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#if !CONFIG(CAR_GLOBAL_MIGRATION)
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/* Allow global unitialized variables when CAR_GLOBALs are not used. */
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#if ENV_STAGE_HAS_BSS_SECTION
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/* Allow global uninitialized variables for stages without CAR teardown. */
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*(.bss)
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*(.bss.*)
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*(.sbss)
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@ -20,7 +20,8 @@
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#include <commonlib/helpers.h>
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#include <stdlib.h>
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#if ENV_CACHE_AS_RAM && CONFIG(CAR_GLOBAL_MIGRATION)
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#if ENV_ROMSTAGE && CONFIG(CAR_GLOBAL_MIGRATION)
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asm(".section .car.global_data,\"w\",@nobits");
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asm(".previous");
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#ifdef __clang__
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@ -29,27 +30,6 @@ asm(".previous");
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#define CAR_GLOBAL __attribute__((used, section(".car.global_data#")))
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#endif /* __clang__ */
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/*
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* In stages that use CAR (verstage, C bootblock) all CAR_GLOBAL variables are
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* accessed unconditionally because cbmem is never initialized until romstage
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* when dram comes up.
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*/
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#if !ENV_ROMSTAGE
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static inline void *car_get_var_ptr(void *var)
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{
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return var;
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}
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static inline void *car_sync_var_ptr(void *var)
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{
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return var;
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}
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static inline int car_active(void)
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{
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return 1;
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}
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#else
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/* Get the correct pointer for the CAR global variable. */
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void *car_get_var_ptr(void *var);
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@ -58,7 +38,6 @@ void *car_sync_var_ptr(void *var);
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/* Return 1 when currently running with globals in Cache-as-RAM, 0 otherwise. */
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int car_active(void);
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#endif /* !ENV_ROMSTAGE */
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/* Get and set a primitive type global variable. */
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#define car_get_var(var) \
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@ -81,26 +60,25 @@ static inline size_t car_object_offset(void *ptr)
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#else
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/*
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* We might end up here if:
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* 1. ENV_CACHE_AS_RAM is not set for the stage or
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* 2. ENV_CACHE_AS_RAM is set for the stage but CONFIG_CAR_GLOBAL_MIGRATION
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* is not set. In this case, there is no need to migrate CAR global
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* variables. But, since we might still be running out of CAR, car_active needs
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* to return 1 if ENV_CACHE_AS_RAM is set.
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* For all stages other than romstage, all CAR_GLOBAL variables are accessed
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* unconditionally as there is no migration of symbols.
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*/
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#define CAR_GLOBAL
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static inline void *car_get_var_ptr(void *var) { return var; }
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#if ENV_CACHE_AS_RAM
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static inline int car_active(void) { return 1; }
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#else
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static inline int car_active(void) { return 0; }
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#endif /* ENV_CACHE_AS_RAM */
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#define car_get_var(var) (var)
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#define car_sync_var(var) (var)
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#define car_set_var(var, val) (var) = (val)
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#endif /* ENV_CACHE_AS_RAM && CONFIG(CAR_GLOBAL_MIGRATION) */
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static inline void *car_get_var_ptr(void *var)
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{
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return var;
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}
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static inline int car_active(void)
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{
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return ENV_CACHE_AS_RAM;
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}
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#endif
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#endif /* ARCH_EARLY_VARIABLES_H */
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@ -363,7 +363,7 @@ static int read_from_cbfs(const char *name, void *buf, size_t size)
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int paging_enable_for_car(const char *pdpt_name, const char *pt_name)
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{
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if (!ENV_CACHE_AS_RAM)
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if (!preram_symbols_available())
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return -1;
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if (read_from_cbfs(pdpt_name, _pdpt, REGION_SIZE(pdpt))) {
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@ -383,7 +383,7 @@ int paging_enable_for_car(const char *pdpt_name, const char *pt_name)
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static void *get_pdpt_addr(void)
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{
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if (ENV_CACHE_AS_RAM)
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if (preram_symbols_available())
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return _pdpt;
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return (void *)(uintptr_t)read_cr3();
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}
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@ -274,8 +274,8 @@
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#define ENV_CACHE_AS_RAM ENV_ROMSTAGE_OR_BEFORE
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/* No .data sections with execute-in-place from ROM. */
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#define ENV_STAGE_HAS_DATA_SECTION !ENV_CACHE_AS_RAM
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/* No .bss sections with execute-in-place from ROM. */
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#define ENV_STAGE_HAS_BSS_SECTION !ENV_CACHE_AS_RAM
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/* No .bss sections for stage with CAR teardown. */
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#define ENV_STAGE_HAS_BSS_SECTION !(ENV_ROMSTAGE && CONFIG(CAR_GLOBAL_MIGRATION))
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#else
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/* Both .data and .bss, sometimes SRAM not DRAM. */
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#define ENV_STAGE_HAS_DATA_SECTION 1
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@ -125,7 +125,7 @@
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}
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#endif
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#if ENV_STAGE_HAS_BSS_SECTION
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#if ENV_STAGE_HAS_BSS_SECTION && !ENV_CACHE_AS_RAM
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.bss . : {
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. = ALIGN(ARCH_POINTER_ALIGN_SIZE);
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_bss = .;
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