@@ -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
@@ -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
@@ -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
@@ -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.
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(-)