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[SeaBIOS] [PATCH] acpi: add xsdt support

Gerd Hoffmann posted 1 patch 4 years ago
Patches applied successfully (tree, apply log)
git fetch https://github.com/patchew-project/seabios tags/patchew/20200327082410.22089-1-kraxel@redhat.com
src/std/acpi.h      | 11 +++++++++++
src/fw/biostables.c | 40 ++++++++++++++++++++++++++++++----------
2 files changed, 41 insertions(+), 10 deletions(-)
[SeaBIOS] [PATCH] acpi: add xsdt support
Posted by Gerd Hoffmann 4 years ago 
In case a xsdt table is present (and located below 4G)
prefer it over rsdt.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 src/std/acpi.h      | 11 +++++++++++
 src/fw/biostables.c | 40 ++++++++++++++++++++++++++++++----------
 2 files changed, 41 insertions(+), 10 deletions(-)

diff --git a/src/std/acpi.h b/src/std/acpi.h
index c01fa7be827c..81c22757f50e 100644
--- a/src/std/acpi.h
+++ b/src/std/acpi.h
@@ -132,6 +132,17 @@ struct rsdt_descriptor_rev1
     /* ACPI tables */
 } PACKED;
 
+/*
+ * ACPI 2.0 eXtended System Description Table (XSDT)
+ */
+#define XSDT_SIGNATURE 0x54445358 // XSDT
+struct xsdt_descriptor_rev2
+{
+    ACPI_TABLE_HEADER_DEF       /* ACPI common table header */
+    u64 table_offset_entry[0];  /* Array of pointers to other */
+    /* ACPI tables */
+} PACKED;
+
 /*
  * ACPI 1.0 Firmware ACPI Control Structure (FACS)
  */
diff --git a/src/fw/biostables.c b/src/fw/biostables.c
index fe8626efc05d..0d4fdb9c22e8 100644
--- a/src/fw/biostables.c
+++ b/src/fw/biostables.c
@@ -141,18 +141,38 @@ find_acpi_table(u32 signature)
     if (!RsdpAddr || RsdpAddr->signature != RSDP_SIGNATURE)
         return NULL;
     struct rsdt_descriptor_rev1 *rsdt = (void*)RsdpAddr->rsdt_physical_address;
+    struct xsdt_descriptor_rev2 *xsdt =
+        RsdpAddr->xsdt_physical_address >= 0x100000000
+        ? NULL : (void*)(u32)(RsdpAddr->xsdt_physical_address);
     dprintf(4, "rsdt=%p\n", rsdt);
-    if (!rsdt || rsdt->signature != RSDT_SIGNATURE)
-        return NULL;
-    void *end = (void*)rsdt + rsdt->length;
-    int i;
-    for (i=0; (void*)&rsdt->table_offset_entry[i] < end; i++) {
-        struct acpi_table_header *tbl = (void*)rsdt->table_offset_entry[i];
-        if (!tbl || tbl->signature != signature)
-            continue;
-        dprintf(4, "table(%x)=%p\n", signature, tbl);
-        return tbl;
+    dprintf(4, "xsdt=%p\n", xsdt);
+
+    if (xsdt && xsdt->signature == XSDT_SIGNATURE) {
+        void *end = (void*)xsdt + xsdt->length;
+        int i;
+        for (i=0; (void*)&xsdt->table_offset_entry[i] < end; i++) {
+            if (xsdt->table_offset_entry[i] >= 0x100000000)
+                continue; /* above 4G */
+            struct acpi_table_header *tbl = (void*)(u32)xsdt->table_offset_entry[i];
+            if (!tbl || tbl->signature != signature)
+                continue;
+            dprintf(1, "table(%x)=%p (via xsdt)\n", signature, tbl);
+            return tbl;
+        }
     }
+
+    if (rsdt && rsdt->signature == RSDT_SIGNATURE) {
+        void *end = (void*)rsdt + rsdt->length;
+        int i;
+        for (i=0; (void*)&rsdt->table_offset_entry[i] < end; i++) {
+            struct acpi_table_header *tbl = (void*)rsdt->table_offset_entry[i];
+            if (!tbl || tbl->signature != signature)
+                continue;
+            dprintf(1, "table(%x)=%p (via rsdt)\n", signature, tbl);
+            return tbl;
+        }
+    }
+
     dprintf(4, "no table %x found\n", signature);
     return NULL;
 }
-- 
2.18.2
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[SeaBIOS] Re: [PATCH] acpi: add xsdt support
Posted by Igor Mammedov 4 years ago 
On Fri, 27 Mar 2020 09:24:10 +0100
Gerd Hoffmann <kraxel@redhat.com> wrote:

> In case a xsdt table is present (and located below 4G)
> prefer it over rsdt.

not related to this patch, but in connection to supporting HW reduced
profile, check places that use FADT.
i.e.
 * check for newer FADT revision
 * skip pm timer init if hw reduced flag is set
 * not sure what to do but there isn't FACS in hw reduced
   so we might need something else in find_resume_vector()
 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  src/std/acpi.h      | 11 +++++++++++
>  src/fw/biostables.c | 40 ++++++++++++++++++++++++++++++----------
>  2 files changed, 41 insertions(+), 10 deletions(-)
> 
> diff --git a/src/std/acpi.h b/src/std/acpi.h
> index c01fa7be827c..81c22757f50e 100644
> --- a/src/std/acpi.h
> +++ b/src/std/acpi.h
> @@ -132,6 +132,17 @@ struct rsdt_descriptor_rev1
>      /* ACPI tables */
>  } PACKED;
>  
> +/*
> + * ACPI 2.0 eXtended System Description Table (XSDT)
> + */
> +#define XSDT_SIGNATURE 0x54445358 // XSDT
> +struct xsdt_descriptor_rev2
> +{
> +    ACPI_TABLE_HEADER_DEF       /* ACPI common table header */
> +    u64 table_offset_entry[0];  /* Array of pointers to other */
> +    /* ACPI tables */
> +} PACKED;
> +
>  /*
>   * ACPI 1.0 Firmware ACPI Control Structure (FACS)
>   */
> diff --git a/src/fw/biostables.c b/src/fw/biostables.c
> index fe8626efc05d..0d4fdb9c22e8 100644
> --- a/src/fw/biostables.c
> +++ b/src/fw/biostables.c
> @@ -141,18 +141,38 @@ find_acpi_table(u32 signature)
>      if (!RsdpAddr || RsdpAddr->signature != RSDP_SIGNATURE)
>          return NULL;
>      struct rsdt_descriptor_rev1 *rsdt = (void*)RsdpAddr->rsdt_physical_address;
> +    struct xsdt_descriptor_rev2 *xsdt =
> +        RsdpAddr->xsdt_physical_address >= 0x100000000
> +        ? NULL : (void*)(u32)(RsdpAddr->xsdt_physical_address);
>      dprintf(4, "rsdt=%p\n", rsdt);
> -    if (!rsdt || rsdt->signature != RSDT_SIGNATURE)
> -        return NULL;
> -    void *end = (void*)rsdt + rsdt->length;
> -    int i;
> -    for (i=0; (void*)&rsdt->table_offset_entry[i] < end; i++) {
> -        struct acpi_table_header *tbl = (void*)rsdt->table_offset_entry[i];
> -        if (!tbl || tbl->signature != signature)
> -            continue;
> -        dprintf(4, "table(%x)=%p\n", signature, tbl);
> -        return tbl;
> +    dprintf(4, "xsdt=%p\n", xsdt);
> +
> +    if (xsdt && xsdt->signature == XSDT_SIGNATURE) {
> +        void *end = (void*)xsdt + xsdt->length;
> +        int i;
> +        for (i=0; (void*)&xsdt->table_offset_entry[i] < end; i++) {
> +            if (xsdt->table_offset_entry[i] >= 0x100000000)
> +                continue; /* above 4G */
can it print a error in such cases, so that user could see that there are unsupported tables
in used machine?

> +            struct acpi_table_header *tbl = (void*)(u32)xsdt->table_offset_entry[i];
> +            if (!tbl || tbl->signature != signature)
> +                continue;
> +            dprintf(1, "table(%x)=%p (via xsdt)\n", signature, tbl);
> +            return tbl;
> +        }
>      }
> +
> +    if (rsdt && rsdt->signature == RSDT_SIGNATURE) {
> +        void *end = (void*)rsdt + rsdt->length;
> +        int i;
> +        for (i=0; (void*)&rsdt->table_offset_entry[i] < end; i++) {
> +            struct acpi_table_header *tbl = (void*)rsdt->table_offset_entry[i];
> +            if (!tbl || tbl->signature != signature)
> +                continue;
> +            dprintf(1, "table(%x)=%p (via rsdt)\n", signature, tbl);
> +            return tbl;
> +        }
> +    }
> +
>      dprintf(4, "no table %x found\n", signature);
>      return NULL;
>  }
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[SeaBIOS] Re: [PATCH] acpi: add xsdt support
Posted by Gerd Hoffmann 4 years ago 
On Fri, Mar 27, 2020 at 04:05:56PM +0100, Igor Mammedov wrote:
> On Fri, 27 Mar 2020 09:24:10 +0100
> Gerd Hoffmann <kraxel@redhat.com> wrote:
> 
> > In case a xsdt table is present (and located below 4G)
> > prefer it over rsdt.
> 
> not related to this patch, but in connection to supporting HW reduced
> profile, check places that use FADT.
> i.e.
>  * check for newer FADT revision
>  * skip pm timer init if hw reduced flag is set

seabios doesn't look at acpi tables to find pm timer.  It depends
on acpi pci devices instead, i.e. on microvm seabios doesn't use
pmtimer anyway.

>  * not sure what to do but there isn't FACS in hw reduced
>    so we might need something else in find_resume_vector()

microvm doesn't support S3/S4, I don't think seabios will ever
need a resume vector ...

cheers,
  Gerd
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