From 58a6ccd34e79acb7835699eab9c1ecb6cc8bbd47 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Tue, 7 Jul 2020 13:12:09 -0600 Subject: [PATCH] x86: Allow devices to write to DSDT Call the new core function to inject ASL programmatically into the DSDT. This is made up of fragments generated by devices that have the inject_dsdt() method. The normal, compiled ASL file is added after this. Signed-off-by: Simon Glass Reviewed-by: Wolfgang Wallner Reviewed-by: Bin Meng --- arch/x86/lib/acpi_table.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c index 4658d88351..eeacfe9b06 100644 --- a/arch/x86/lib/acpi_table.c +++ b/arch/x86/lib/acpi_table.c @@ -406,11 +406,20 @@ ulong write_acpi_tables(ulong start_addr) debug("ACPI: * DSDT\n"); dsdt = ctx->current; + + /* Put the table header first */ memcpy(dsdt, &AmlCode, sizeof(struct acpi_table_header)); acpi_inc(ctx, sizeof(struct acpi_table_header)); + + /* If the table is not empty, allow devices to inject things */ + if (dsdt->length >= sizeof(struct acpi_table_header)) + acpi_inject_dsdt(ctx); + + /* Copy in the AML code itself if any (after the header) */ memcpy(ctx->current, (char *)&AmlCode + sizeof(struct acpi_table_header), dsdt->length - sizeof(struct acpi_table_header)); + acpi_inc_align(ctx, dsdt->length - sizeof(struct acpi_table_header)); /* Pack GNVS into the ACPI table area */ @@ -425,7 +434,12 @@ ulong write_acpi_tables(ulong start_addr) } } - /* Update DSDT checksum since we patched the GNVS address */ + /* + * Recalculate the length and update the DSDT checksum since we patched + * 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); -- 2.39.5