x86: acpi: Introduce a stub to generate CSRT
Here is a stub function that generates an empty CSRT. If the target platform
provides acpi_fill_csrt() function, it will be used to populate the table.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c
index 270274f..0d69cf2 100644
--- a/arch/x86/lib/acpi_table.c
+++ b/arch/x86/lib/acpi_table.c
@@ -337,6 +337,30 @@
header->checksum = table_compute_checksum((void *)mcfg, header->length);
}
+__weak u32 acpi_fill_csrt(u32 current)
+{
+ return current;
+}
+
+static void acpi_create_csrt(struct acpi_csrt *csrt)
+{
+ struct acpi_table_header *header = &(csrt->header);
+ u32 current = (u32)csrt + sizeof(struct acpi_csrt);
+
+ memset((void *)csrt, 0, sizeof(struct acpi_csrt));
+
+ /* Fill out header fields */
+ acpi_fill_header(header, "CSRT");
+ header->length = sizeof(struct acpi_csrt);
+ header->revision = 0;
+
+ current = acpi_fill_csrt(current);
+
+ /* (Re)calculate length and checksum */
+ header->length = current - (u32)csrt;
+ header->checksum = table_compute_checksum((void *)csrt, header->length);
+}
+
static void acpi_create_spcr(struct acpi_spcr *spcr)
{
struct acpi_table_header *header = &(spcr->header);
@@ -464,6 +488,7 @@
struct acpi_fadt *fadt;
struct acpi_mcfg *mcfg;
struct acpi_madt *madt;
+ struct acpi_csrt *csrt;
struct acpi_spcr *spcr;
int i;
@@ -553,6 +578,13 @@
acpi_add_table(rsdp, mcfg);
current = ALIGN(current, 16);
+ debug("ACPI: * CSRT\n");
+ csrt = (struct acpi_csrt *)current;
+ acpi_create_csrt(csrt);
+ current += csrt->header.length;
+ acpi_add_table(rsdp, csrt);
+ current = ALIGN(current, 16);
+
debug("ACPI: * SPCR\n");
spcr = (struct acpi_spcr *)current;
acpi_create_spcr(spcr);