diff options
Diffstat (limited to 'src/arch/x86')
| -rw-r--r-- | src/arch/x86/Kconfig | 6 | ||||
| -rw-r--r-- | src/arch/x86/assembly_entry.S | 11 | ||||
| -rw-r--r-- | src/arch/x86/early_ram.ld | 43 | ||||
| -rw-r--r-- | src/arch/x86/include/arch/memlayout.h | 3 | ||||
| -rw-r--r-- | src/arch/x86/memlayout.ld | 4 |
5 files changed, 62 insertions, 5 deletions
diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig index 21107aa48b..11733bd05e 100644 --- a/src/arch/x86/Kconfig +++ b/src/arch/x86/Kconfig @@ -89,9 +89,10 @@ config X86_RESET_VECTOR config RESET_VECTOR_IN_RAM bool depends on ARCH_X86 + select NO_XIP_EARLY_STAGES help - Select this option if the x86 soc implements custom code to handle the - reset vector in RAM instead of the traditional 0xfffffff0 location. + Select this option if the x86 processor's reset vector is in + preinitialized DRAM instead of the traditional 0xfffffff0 location. # Aligns 16bit entry code in bootblock so that hyper-threading CPUs # can boot AP CPUs to enable their shared caches. @@ -206,6 +207,7 @@ config VERSTAGE_ADDR config POSTCAR_STAGE def_bool y depends on ARCH_X86 + depends on !RESET_VECTOR_IN_RAM config VERSTAGE_DEBUG_SPINLOOP bool diff --git a/src/arch/x86/assembly_entry.S b/src/arch/x86/assembly_entry.S index f36e7dab4d..59b34c8713 100644 --- a/src/arch/x86/assembly_entry.S +++ b/src/arch/x86/assembly_entry.S @@ -9,6 +9,13 @@ * continue with C code execution one needs to set stack pointer and * clear .bss variables that are stage specific. */ + +#if CONFIG(RESET_VECTOR_IN_RAM) + #define _STACK_TOP _eearlyram_stack +#else + #define _STACK_TOP _ecar_stack +#endif + .section ".text._start", "ax", @progbits .global _start _start: @@ -16,8 +23,8 @@ _start: /* Migrate GDT to this text segment */ call gdt_init - /* reset stack pointer to CAR stack */ - mov $_ecar_stack, %esp + /* reset stack pointer to CAR/EARLYRAM stack */ + mov $_STACK_TOP, %esp /* clear .bss section as it is not shared */ cld diff --git a/src/arch/x86/early_ram.ld b/src/arch/x86/early_ram.ld new file mode 100644 index 0000000000..941c385b04 --- /dev/null +++ b/src/arch/x86/early_ram.ld @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* This file is part of the coreboot project. */ + +/* This file is included inside a SECTIONS block */ + +_STACK_SIZE = CONFIG_EARLYRAM_BSP_STACK_SIZE; +_ = ASSERT(_STACK_SIZE > 0x0, "EARLYRAM_BSP_STACK_SIZE is not configured"); + +_CONSOLE_SIZE = CONFIG_PRERAM_CBMEM_CONSOLE_SIZE; +_ = ASSERT(_CONSOLE_SIZE > 0x0, "PRERAM_CBMEM_CONSOLE_SIZE is not configured"); + +_TIMESTAMPS_SIZE = 0x200; +#if !CONFIG(NO_FMAP_CACHE) +_FMAP_SIZE = FMAP_SIZE; +#else +_FMAP_SIZE = 0; +#endif + +/* + * The PRERAM_CBMEM_CONSOLE, TIMESTAMP, and FMAP_CACHE regions are shared + * between the pre-ram stages (bootblock, romstage, etc). We need to assign a + * fixed size and consistent link address so they can be shared between stages. + * + * The stack area is not shared between stages, but is defined here for + * convenience. + */ +. = CONFIG_X86_RESET_VECTOR - ARCH_STACK_ALIGN_SIZE - _STACK_SIZE - _CONSOLE_SIZE - _TIMESTAMPS_SIZE - _FMAP_SIZE; + +_ = ASSERT(. > _eprogram, "Not enough room for .earlyram.data. Try increasing C_ENV_BOOTBLOCK_SIZE, or decreasing either EARLYRAM_BSP_STACK_SIZE or PRERAM_CBMEM_CONSOLE_SIZE."); + +.stack ALIGN(ARCH_STACK_ALIGN_SIZE) (NOLOAD) : { + EARLYRAM_STACK(., _STACK_SIZE) +} + +.persistent ALIGN(ARCH_POINTER_ALIGN_SIZE) (NOLOAD) : { + PRERAM_CBMEM_CONSOLE(., _CONSOLE_SIZE) + TIMESTAMP(., _TIMESTAMPS_SIZE) + #if !CONFIG(NO_FMAP_CACHE) + FMAP_CACHE(., FMAP_SIZE) + #endif +} + +_ = ASSERT(. <= CONFIG_X86_RESET_VECTOR, "Earlyram data regions don't fit below the reset vector!"); diff --git a/src/arch/x86/include/arch/memlayout.h b/src/arch/x86/include/arch/memlayout.h index 2eea83faaf..34d1bd2567 100644 --- a/src/arch/x86/include/arch/memlayout.h +++ b/src/arch/x86/include/arch/memlayout.h @@ -8,4 +8,7 @@ # error "CONFIG_RAMTOP not configured" #endif +/* Intel386 psABI requires a 16 byte aligned stack. */ +#define ARCH_STACK_ALIGN_SIZE 16 + #endif /* __ARCH_MEMLAYOUT_H */ diff --git a/src/arch/x86/memlayout.ld b/src/arch/x86/memlayout.ld index 5e1ef24655..31767b3c31 100644 --- a/src/arch/x86/memlayout.ld +++ b/src/arch/x86/memlayout.ld @@ -9,7 +9,7 @@ #if ENV_CACHE_AS_RAM #define EARLY_MEMLAYOUT "car.ld" #else -#error "Early DRAM environment for x86 is work-in-progress. */ +#define EARLY_MEMLAYOUT "early_ram.ld" #endif #endif @@ -53,7 +53,9 @@ SECTIONS /* Bootblock specific scripts which provide more SECTION directives. */ #include <cpu/x86/16bit/entry16.ld> #include <cpu/x86/16bit/reset16.ld> +#if !CONFIG(RESET_VECTOR_IN_RAM) #include <arch/x86/id.ld> +#endif #if CONFIG(CPU_INTEL_FIRMWARE_INTERFACE_TABLE) #include <cpu/intel/fit/fit.ld> #endif |