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acpi: fix initial RSDT and XSDT size

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When creating the RSDT and the XSDT table they contain no entries.
The table size therefore must equal the header size.

Without this change a NULL deference has been observed in
acpi_find_table() when running `ut dm` on sandbox64_defconfig
executed via `sudo ./u-boot -D`.

Fixes: 94ba15a3f1 ("x86: Move base tables to a writer function")
Fixes: 7e586f6907 ("acpi: Put table-setup code in its own function")
Fixes: ab5efd576c ("x86: acpi: Adjust order in acpi_table.c")
Fixes: 867bcb63e7 ("x86: Generate a valid ACPI table")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

Update dm_test_acpi_ctx_and_base_tables() in test/dm/acpi.c to expect
sizeof(struct acpi_table_header) for the initial table length (instead
of sizeof(*rsdt) / sizeof(*xsdt)), and to compute the checksum over
header->length bytes rather than the full struct size:
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Heinrich Schuchardt
2026-04-20 18:47:25 +02:00
committed by Simon Glass
parent 22a285380e
commit 3d09ec64eb
2 changed files with 6 additions and 6 deletions
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4
lib/acpi/base.c
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@@ -44,7 +44,7 @@ static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
/* Fill out header fields */
acpi_fill_header(header, "RSDT");
header->length = sizeof(struct acpi_rsdt);
header->length = sizeof(struct acpi_table_header);
header->revision = 1;
/* Entries are filled in later, we come with an empty set */
@@ -59,7 +59,7 @@ static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
/* Fill out header fields */
acpi_fill_header(header, "XSDT");
header->length = sizeof(struct acpi_xsdt);
header->length = sizeof(struct acpi_table_header);
header->revision = 1;
/* Entries are filled in later, we come with an empty set */