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authorHeinrich Schuchardt <heinrich.schuchardt@canonical.com>2023-11-18 22:57:26 +0100
committerTom Rini <trini@konsulko.com>2023-12-13 18:39:05 -0500
commit5574d82fbc3ed1e150f6151ad20be968819baa88 (patch)
treee172a3d2d069793b324b443ed15f65db3b8f9b2e /lib
parentfef4896dc8a4479a6197c0057edde9d2d8c6dbac (diff)
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acpi: consider XSDT in acpi_find_table()
The RSDT table is deprecated and does not exist on all systems. By preference scan XSDT for the table to find. If no XSDT table exists, try to use the RSDT table. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/acpi/acpi.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/lib/acpi/acpi.c b/lib/acpi/acpi.c
index 14b1575..f21e509 100644
--- a/lib/acpi/acpi.c
+++ b/lib/acpi/acpi.c
@@ -16,18 +16,30 @@ struct acpi_table_header *acpi_find_table(const char *sig)
{
struct acpi_rsdp *rsdp;
struct acpi_rsdt *rsdt;
+ struct acpi_xsdt *xsdt;
int len, i, count;
rsdp = map_sysmem(gd_acpi_start(), 0);
if (!rsdp)
return NULL;
- rsdt = map_sysmem(rsdp->rsdt_address, 0);
- len = rsdt->header.length - sizeof(rsdt->header);
- count = len / sizeof(u32);
+ if (rsdp->xsdt_address) {
+ xsdt = map_sysmem(rsdp->xsdt_address, 0);
+ len = xsdt->header.length - sizeof(xsdt->header);
+ count = len / sizeof(u64);
+ } else {
+ if (!rsdp->rsdt_address)
+ return NULL;
+ rsdt = map_sysmem(rsdp->rsdt_address, 0);
+ len = rsdt->header.length - sizeof(rsdt->header);
+ count = len / sizeof(u32);
+ }
for (i = 0; i < count; i++) {
struct acpi_table_header *hdr;
- hdr = map_sysmem(rsdt->entry[i], 0);
+ if (rsdp->xsdt_address)
+ hdr = map_sysmem(xsdt->entry[i], 0);
+ else
+ hdr = map_sysmem(rsdt->entry[i], 0);
if (!memcmp(hdr->signature, sig, ACPI_NAME_LEN))
return hdr;
if (!memcmp(hdr->signature, "FACP", ACPI_NAME_LEN)) {