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x86: acpi: Fix calculation of DSDT length

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Currently, the calculation for the length of the DSDT table includes any
bytes that are added for alignment, but those bytes are not initialized.

This is because the DSDT length is calculated after a call to
acpi_inc_align(). Split this up into the following sequence:

  * acpi_inc()
  * Calculate DSDT length
  * acpi_align()

Signed-off-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Wolfgang Wallner 2020-09-16 16:57:52 +02:00 committed by Bin Meng
parent 674c58c7b7
commit 3f6966ab2b
1 changed files with 3 additions and 1 deletions
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4
arch/x86/lib/acpi_table.c
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@ -427,7 +427,7 @@ ulong write_acpi_tables(ulong start_addr)
(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));
acpi_inc(ctx, dsdt->length - sizeof(struct acpi_table_header));
/* Pack GNVS into the ACPI table area */
for (i = 0; i < dsdt->length; i++) {
@ -450,6 +450,8 @@ ulong write_acpi_tables(ulong start_addr)
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.