Update the SPCR table to accommodate the SPCR Table revision 4 [1].
The SPCR table has been modified to adhere to the revision 4 format [2].

[1]: https://learn.microsoft.com/en-us/windows-hardware/drivers/serports/serial-port-console-redirection-table
[2]: https://github.com/acpica/acpica/pull/931

Signed-off-by: Sia Jee Heng <jeeheng.sia@starfivetech.com>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
---
 hw/acpi/aml-build.c         | 20 ++++++++++++++++----
 hw/arm/virt-acpi-build.c    |  8 ++++++--
 hw/riscv/virt-acpi-build.c  | 12 +++++++++---
 include/hw/acpi/acpi-defs.h |  7 +++++--
 include/hw/acpi/aml-build.h |  2 +-
 5 files changed, 37 insertions(+), 12 deletions(-)

diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index 6d4517cfbe..99a1b403e2 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -1996,7 +1996,7 @@ static void build_processor_hierarchy_node(GArray *tbl, uint32_t flags,
 
 void build_spcr(GArray *table_data, BIOSLinker *linker,
                 const AcpiSpcrData *f, const uint8_t rev,
-                const char *oem_id, const char *oem_table_id)
+                const char *oem_id, const char *oem_table_id, const char *name)
 {
     AcpiTable table = { .sig = "SPCR", .rev = rev, .oem_id = oem_id,
                         .oem_table_id = oem_table_id };
@@ -2042,9 +2042,21 @@ void build_spcr(GArray *table_data, BIOSLinker *linker,
     build_append_int_noprefix(table_data, f->pci_flags, 4);
     /* PCI Segment */
     build_append_int_noprefix(table_data, f->pci_segment, 1);
-    /* Reserved */
-    build_append_int_noprefix(table_data, 0, 4);
-
+    if (rev < 4) {
+        /* Reserved */
+        build_append_int_noprefix(table_data, 0, 4);
+    } else {
+        /* UartClkFreq */
+        build_append_int_noprefix(table_data, f->uart_clk_freq, 4);
+        /* PreciseBaudrate */
+        build_append_int_noprefix(table_data, f->precise_baudrate, 4);
+        /* NameSpaceStringLength */
+        build_append_int_noprefix(table_data, f->namespace_string_length, 2);
+        /* NameSpaceStringOffset */
+        build_append_int_noprefix(table_data, f->namespace_string_offset, 2);
+        /* NamespaceString[] */
+        g_array_append_vals(table_data, name, f->namespace_string_length);
+    }
     acpi_table_end(linker, &table);
 }
 /*
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index f76fb117ad..0b6f5f8d8d 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -464,8 +464,12 @@ spcr_setup(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
         .pci_flags = 0,
         .pci_segment = 0,
     };
-
-    build_spcr(table_data, linker, &serial, 2, vms->oem_id, vms->oem_table_id);
+    /*
+     * Passing NULL as the SPCR Table for Revision 2 doesn't support
+     * NameSpaceString.
+     */
+    build_spcr(table_data, linker, &serial, 2, vms->oem_id, vms->oem_table_id,
+               NULL);
 }
 
 /*
diff --git a/hw/riscv/virt-acpi-build.c b/hw/riscv/virt-acpi-build.c
index 36d6a3a412..68ef15acac 100644
--- a/hw/riscv/virt-acpi-build.c
+++ b/hw/riscv/virt-acpi-build.c
@@ -200,14 +200,15 @@ acpi_dsdt_add_uart(Aml *scope, const MemMapEntry *uart_memmap,
 
 /*
  * Serial Port Console Redirection Table (SPCR)
- * Rev: 1.07
+ * Rev: 1.10
  */
 
 static void
 spcr_setup(GArray *table_data, BIOSLinker *linker, RISCVVirtState *s)
 {
+    const char name[] = ".";
     AcpiSpcrData serial = {
-        .interface_type = 0,       /* 16550 compatible */
+        .interface_type = 0x12,       /* 16550 compatible */
         .base_addr.id = AML_AS_SYSTEM_MEMORY,
         .base_addr.width = 32,
         .base_addr.offset = 0,
@@ -229,9 +230,14 @@ spcr_setup(GArray *table_data, BIOSLinker *linker, RISCVVirtState *s)
         .pci_function = 0,
         .pci_flags = 0,
         .pci_segment = 0,
+        .uart_clk_freq = 0,
+        .precise_baudrate = 0,
+        .namespace_string_length = sizeof(name),
+        .namespace_string_offset = 88,
     };
 
-    build_spcr(table_data, linker, &serial, 2, s->oem_id, s->oem_table_id);
+    build_spcr(table_data, linker, &serial, 4, s->oem_id, s->oem_table_id,
+               name);
 }
 
 /* RHCT Node[N] starts at offset 56 */
diff --git a/include/hw/acpi/acpi-defs.h b/include/hw/acpi/acpi-defs.h
index 0e6e82b339..2e6e341998 100644
--- a/include/hw/acpi/acpi-defs.h
+++ b/include/hw/acpi/acpi-defs.h
@@ -112,7 +112,6 @@ typedef struct AcpiSpcrData {
     uint8_t flow_control;
     uint8_t terminal_type;
     uint8_t language;
-    uint8_t reserved1;
     uint16_t pci_device_id;    /* Must be 0xffff if not PCI device */
     uint16_t pci_vendor_id;    /* Must be 0xffff if not PCI device */
     uint8_t pci_bus;
@@ -120,7 +119,11 @@ typedef struct AcpiSpcrData {
     uint8_t pci_function;
     uint32_t pci_flags;
     uint8_t pci_segment;
-    uint32_t reserved2;
+    uint32_t uart_clk_freq;
+    uint32_t precise_baudrate;
+    uint32_t namespace_string_length;
+    uint32_t namespace_string_offset;
+    char namespace_string[];
 } AcpiSpcrData;
 
 #define ACPI_FADT_ARM_PSCI_COMPLIANT  (1 << 0)
diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
index a3784155cb..68c0f2dbee 100644
--- a/include/hw/acpi/aml-build.h
+++ b/include/hw/acpi/aml-build.h
@@ -500,5 +500,5 @@ void build_tpm2(GArray *table_data, BIOSLinker *linker, GArray *tcpalog,
 
 void build_spcr(GArray *table_data, BIOSLinker *linker,
                 const AcpiSpcrData *f, const uint8_t rev,
-                const char *oem_id, const char *oem_table_id);
+                const char *oem_id, const char *oem_table_id, const char *name);
 #endif
-- 
2.34.1

On 2024/8/29 上午9:59, Sia Jee Heng wrote:
> Update the SPCR table to accommodate the SPCR Table revision 4 [1].
> The SPCR table has been modified to adhere to the revision 4 format [2].
> 
> [1]: https://learn.microsoft.com/en-us/windows-hardware/drivers/serports/serial-port-console-redirection-table
> [2]: https://github.com/acpica/acpica/pull/931
> 
> Signed-off-by: Sia Jee Heng <jeeheng.sia@starfivetech.com>
> Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
> Acked-by: Alistair Francis <alistair.francis@wdc.com>
> ---
>   hw/acpi/aml-build.c         | 20 ++++++++++++++++----
>   hw/arm/virt-acpi-build.c    |  8 ++++++--
>   hw/riscv/virt-acpi-build.c  | 12 +++++++++---
>   include/hw/acpi/acpi-defs.h |  7 +++++--
>   include/hw/acpi/aml-build.h |  2 +-
>   5 files changed, 37 insertions(+), 12 deletions(-)
> 
> diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
> index 6d4517cfbe..99a1b403e2 100644
> --- a/hw/acpi/aml-build.c
> +++ b/hw/acpi/aml-build.c
> @@ -1996,7 +1996,7 @@ static void build_processor_hierarchy_node(GArray *tbl, uint32_t flags,
>   
>   void build_spcr(GArray *table_data, BIOSLinker *linker,
>                   const AcpiSpcrData *f, const uint8_t rev,
> -                const char *oem_id, const char *oem_table_id)
> +                const char *oem_id, const char *oem_table_id, const char *name)

Sorry for late response. LoongArch virt-machine uses function 
build_spcr() also. Maybe there need small modification on it.

Regards
Bibo Mao
>   {
>       AcpiTable table = { .sig = "SPCR", .rev = rev, .oem_id = oem_id,
>                           .oem_table_id = oem_table_id };
> @@ -2042,9 +2042,21 @@ void build_spcr(GArray *table_data, BIOSLinker *linker,
>       build_append_int_noprefix(table_data, f->pci_flags, 4);
>       /* PCI Segment */
>       build_append_int_noprefix(table_data, f->pci_segment, 1);
> -    /* Reserved */
> -    build_append_int_noprefix(table_data, 0, 4);
> -
> +    if (rev < 4) {
> +        /* Reserved */
> +        build_append_int_noprefix(table_data, 0, 4);
> +    } else {
> +        /* UartClkFreq */
> +        build_append_int_noprefix(table_data, f->uart_clk_freq, 4);
> +        /* PreciseBaudrate */
> +        build_append_int_noprefix(table_data, f->precise_baudrate, 4);
> +        /* NameSpaceStringLength */
> +        build_append_int_noprefix(table_data, f->namespace_string_length, 2);
> +        /* NameSpaceStringOffset */
> +        build_append_int_noprefix(table_data, f->namespace_string_offset, 2);
> +        /* NamespaceString[] */
> +        g_array_append_vals(table_data, name, f->namespace_string_length);
> +    }
>       acpi_table_end(linker, &table);
>   }
>   /*
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index f76fb117ad..0b6f5f8d8d 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -464,8 +464,12 @@ spcr_setup(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>           .pci_flags = 0,
>           .pci_segment = 0,
>       };
> -
> -    build_spcr(table_data, linker, &serial, 2, vms->oem_id, vms->oem_table_id);
> +    /*
> +     * Passing NULL as the SPCR Table for Revision 2 doesn't support
> +     * NameSpaceString.
> +     */
> +    build_spcr(table_data, linker, &serial, 2, vms->oem_id, vms->oem_table_id,
> +               NULL);
>   }
>   
>   /*
> diff --git a/hw/riscv/virt-acpi-build.c b/hw/riscv/virt-acpi-build.c
> index 36d6a3a412..68ef15acac 100644
> --- a/hw/riscv/virt-acpi-build.c
> +++ b/hw/riscv/virt-acpi-build.c
> @@ -200,14 +200,15 @@ acpi_dsdt_add_uart(Aml *scope, const MemMapEntry *uart_memmap,
>   
>   /*
>    * Serial Port Console Redirection Table (SPCR)
> - * Rev: 1.07
> + * Rev: 1.10
>    */
>   
>   static void
>   spcr_setup(GArray *table_data, BIOSLinker *linker, RISCVVirtState *s)
>   {
> +    const char name[] = ".";
>       AcpiSpcrData serial = {
> -        .interface_type = 0,       /* 16550 compatible */
> +        .interface_type = 0x12,       /* 16550 compatible */
>           .base_addr.id = AML_AS_SYSTEM_MEMORY,
>           .base_addr.width = 32,
>           .base_addr.offset = 0,
> @@ -229,9 +230,14 @@ spcr_setup(GArray *table_data, BIOSLinker *linker, RISCVVirtState *s)
>           .pci_function = 0,
>           .pci_flags = 0,
>           .pci_segment = 0,
> +        .uart_clk_freq = 0,
> +        .precise_baudrate = 0,
> +        .namespace_string_length = sizeof(name),
> +        .namespace_string_offset = 88,
>       };
>   
> -    build_spcr(table_data, linker, &serial, 2, s->oem_id, s->oem_table_id);
> +    build_spcr(table_data, linker, &serial, 4, s->oem_id, s->oem_table_id,
> +               name);
>   }
>   
>   /* RHCT Node[N] starts at offset 56 */
> diff --git a/include/hw/acpi/acpi-defs.h b/include/hw/acpi/acpi-defs.h
> index 0e6e82b339..2e6e341998 100644
> --- a/include/hw/acpi/acpi-defs.h
> +++ b/include/hw/acpi/acpi-defs.h
> @@ -112,7 +112,6 @@ typedef struct AcpiSpcrData {
>       uint8_t flow_control;
>       uint8_t terminal_type;
>       uint8_t language;
> -    uint8_t reserved1;
>       uint16_t pci_device_id;    /* Must be 0xffff if not PCI device */
>       uint16_t pci_vendor_id;    /* Must be 0xffff if not PCI device */
>       uint8_t pci_bus;
> @@ -120,7 +119,11 @@ typedef struct AcpiSpcrData {
>       uint8_t pci_function;
>       uint32_t pci_flags;
>       uint8_t pci_segment;
> -    uint32_t reserved2;
> +    uint32_t uart_clk_freq;
> +    uint32_t precise_baudrate;
> +    uint32_t namespace_string_length;
> +    uint32_t namespace_string_offset;
> +    char namespace_string[];
>   } AcpiSpcrData;
>   
>   #define ACPI_FADT_ARM_PSCI_COMPLIANT  (1 << 0)
> diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
> index a3784155cb..68c0f2dbee 100644
> --- a/include/hw/acpi/aml-build.h
> +++ b/include/hw/acpi/aml-build.h
> @@ -500,5 +500,5 @@ void build_tpm2(GArray *table_data, BIOSLinker *linker, GArray *tcpalog,
>   
>   void build_spcr(GArray *table_data, BIOSLinker *linker,
>                   const AcpiSpcrData *f, const uint8_t rev,
> -                const char *oem_id, const char *oem_table_id);
> +                const char *oem_id, const char *oem_table_id, const char *name);
>   #endif
>