At present U-Boot puts a magic number in the ASL for the GNVS table and searches for it later.
Add a Kconfig option to use a different approach, where the ASL files declare the table as an external symbol. U-Boot can then put it wherever it likes, without any magic numbers or searching.
Signed-off-by: Simon Glass sjg@chromium.org ---
(no changes since v1)
arch/x86/Kconfig | 7 ++++++ arch/x86/cpu/apollolake/Kconfig | 1 + arch/x86/include/asm/acpi/global_nvs.h | 3 +++ arch/x86/lib/acpi_table.c | 35 +++++++++++++++++--------- 4 files changed, 34 insertions(+), 12 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 256a1100bd3..680f26f1b8e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -788,6 +788,13 @@ config GENERATE_ACPI_TABLE by the operating system. It defines platform-independent interfaces for configuration and power management monitoring.
+config ACPI_GNVS_EXTERNAL + bool + help + Put the GNVS (Global Non-Volatile Sleeping) table separate from the + DSDT and add a pointer to the table from the DSDT. This allows + U-Boot to better control the address of the GNVS. + endmenu
config HAVE_ACPI_RESUME diff --git a/arch/x86/cpu/apollolake/Kconfig b/arch/x86/cpu/apollolake/Kconfig index 37d6289ee41..16ac2b3f504 100644 --- a/arch/x86/cpu/apollolake/Kconfig +++ b/arch/x86/cpu/apollolake/Kconfig @@ -17,6 +17,7 @@ config INTEL_APOLLOLAKE select PCH_SUPPORT select P2SB select SMP_AP_WORK + select ACPI_GNVS_EXTERNAL imply ENABLE_MRC_CACHE imply AHCI_PCI imply SCSI diff --git a/arch/x86/include/asm/acpi/global_nvs.h b/arch/x86/include/asm/acpi/global_nvs.h index d56d35ca533..a552cf6374f 100644 --- a/arch/x86/include/asm/acpi/global_nvs.h +++ b/arch/x86/include/asm/acpi/global_nvs.h @@ -11,6 +11,9 @@ * ACPI_GNVS_SIZE. They are to be used in platform's global_nvs.asl file * to declare the GNVS OperationRegion, as well as write_acpi_tables() * for the GNVS address runtime fix up. + * + * If using CONFIG_ACPI_GNVS_EXTERNAL, we don't need to locate the GNVS in + * DSDT, since it is created by code, so ACPI_GNVS_ADDR is unused. */ #define ACPI_GNVS_ADDR 0xdeadbeef #define ACPI_GNVS_SIZE 0x100 diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c index c445aa68703..36ef3e5f0b7 100644 --- a/arch/x86/lib/acpi_table.c +++ b/arch/x86/lib/acpi_table.c @@ -430,17 +430,31 @@ ulong write_acpi_tables(ulong start_addr) dsdt->length - sizeof(struct acpi_table_header));
acpi_inc(ctx, dsdt->length - sizeof(struct acpi_table_header)); + dsdt->length = ctx->current - (void *)dsdt; + acpi_align(ctx);
- /* Pack GNVS into the ACPI table area */ - for (i = 0; i < dsdt->length; i++) { - u32 *gnvs = (u32 *)((u32)dsdt + i); - if (*gnvs == ACPI_GNVS_ADDR) { - ulong addr = (ulong)map_to_sysmem(ctx->current); - - debug("Fix up global NVS in DSDT to %#08lx\n", addr); - *gnvs = addr; - break; + if (!IS_ENABLED(CONFIG_ACPI_GNVS_EXTERNAL)) { + /* Pack GNVS into the ACPI table area */ + for (i = 0; i < dsdt->length; i++) { + u32 *gnvs = (u32 *)((u32)dsdt + i); + + if (*gnvs == ACPI_GNVS_ADDR) { + *gnvs = map_to_sysmem(ctx->current); + debug("Fix up global NVS in DSDT to %#08x\n", + *gnvs); + break; + } } + + /* + * Fill in platform-specific global NVS variables. If this fails + * we cannot return the error but this should only happen while + * debugging. + */ + addr = acpi_create_gnvs(ctx->current); + if (IS_ERR_VALUE(addr)) + printf("Error: Gailed to create GNVS\n"); + acpi_inc_align(ctx, sizeof(struct acpi_global_nvs)); }
/* @@ -448,12 +462,9 @@ ulong write_acpi_tables(ulong start_addr) * the GNVS address. Set the checksum to zero since it is part of the * region being checksummed. */ - dsdt->length = ctx->current - (void *)dsdt; dsdt->checksum = 0; dsdt->checksum = table_compute_checksum((void *)dsdt, dsdt->length);
- acpi_align(ctx); - /* * Fill in platform-specific global NVS variables. If this fails we * cannot return the error but this should only happen while debugging.