Re: [Qemu-devel] [PATCH v3 8/8] hw: acpi: Remove AcpiRsdpDescriptor and fix tests

[Igor Mammedov <imammedo@redhat.com>]

On Fri, 30 Nov 2018 14:00:32 +0100
Samuel Ortiz <sameo@linux.intel.com> wrote:

> The only remaining AcpiRsdpDescriptor users are the ACPI utils for the
> BIOS table tests.
> We remove that dependency and can thus remove the structure itself.
> 
> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> ---
>  include/hw/acpi/acpi-defs.h | 13 -----------
>  tests/acpi-utils.h          |  4 +++-
>  tests/acpi-utils.c          | 46 ++++++++++++++++++++++++++++++-------
>  tests/bios-tables-test.c    | 21 +++++++++++++----
>  tests/vmgenid-test.c        |  8 ++++---
>  5 files changed, 62 insertions(+), 30 deletions(-)
> 
> diff --git a/include/hw/acpi/acpi-defs.h b/include/hw/acpi/acpi-defs.h
> index 8425ecb8c6..5021cb9e79 100644
> --- a/include/hw/acpi/acpi-defs.h
> +++ b/include/hw/acpi/acpi-defs.h
> @@ -40,19 +40,6 @@ enum {
>      ACPI_FADT_F_LOW_POWER_S0_IDLE_CAPABLE,
>  };
>  
> -struct AcpiRsdpDescriptor {        /* Root System Descriptor Pointer */
> -    uint64_t signature;              /* ACPI signature, contains "RSD PTR " */
> -    uint8_t  checksum;               /* To make sum of struct == 0 */
> -    uint8_t  oem_id [6];             /* OEM identification */
> -    uint8_t  revision;               /* Must be 0 for 1.0, 2 for 2.0 */
> -    uint32_t rsdt_physical_address;  /* 32-bit physical address of RSDT */
> -    uint32_t length;                 /* XSDT Length in bytes including hdr */
> -    uint64_t xsdt_physical_address;  /* 64-bit physical address of XSDT */
> -    uint8_t  extended_checksum;      /* Checksum of entire table */
> -    uint8_t  reserved [3];           /* Reserved field must be 0 */
> -} QEMU_PACKED;
> -typedef struct AcpiRsdpDescriptor AcpiRsdpDescriptor;
> -
>  typedef struct AcpiRsdpData {
>      uint8_t oem_id[6]; /* OEM identification */
>      uint8_t revision;  /* Must be 0 for 1.0, 2 for 2.0 */
> diff --git a/tests/acpi-utils.h b/tests/acpi-utils.h
> index ac52abd0dd..4f4899deb5 100644
> --- a/tests/acpi-utils.h
> +++ b/tests/acpi-utils.h
> @@ -82,6 +82,8 @@ typedef struct {
>  
>  uint8_t acpi_calc_checksum(const uint8_t *data, int len);
>  uint32_t acpi_find_rsdp_address(void);
> -void acpi_parse_rsdp_table(uint32_t addr, AcpiRsdpDescriptor *rsdp_table);
> +uint32_t acpi_get_rsdt_address(uint8_t *rsdp_table);
> +uint64_t acpi_get_xsdt_address(uint8_t *rsdp_table);
> +void acpi_parse_rsdp_table(uint32_t addr, uint8_t *rsdp_table);
>  
>  #endif  /* TEST_ACPI_UTILS_H */
> diff --git a/tests/acpi-utils.c b/tests/acpi-utils.c
> index 41dc1ea9b4..d07f7487e2 100644
> --- a/tests/acpi-utils.c
> +++ b/tests/acpi-utils.c
> @@ -52,14 +52,44 @@ uint32_t acpi_find_rsdp_address(void)
>      return off;
>  }
>  
> -void acpi_parse_rsdp_table(uint32_t addr, AcpiRsdpDescriptor *rsdp_table)
> +uint32_t acpi_get_rsdt_address(uint8_t *rsdp_table)
>  {
> -    ACPI_READ_FIELD(rsdp_table->signature, addr);
> -    ACPI_ASSERT_CMP64(rsdp_table->signature, "RSD PTR ");
> +    uint32_t rsdt_physical_address;
>  
> -    ACPI_READ_FIELD(rsdp_table->checksum, addr);
> -    ACPI_READ_ARRAY(rsdp_table->oem_id, addr);
> -    ACPI_READ_FIELD(rsdp_table->revision, addr);
> -    ACPI_READ_FIELD(rsdp_table->rsdt_physical_address, addr);
> -    ACPI_READ_FIELD(rsdp_table->length, addr);
> +    memcpy(&rsdt_physical_address, &rsdp_table[16 /* RsdtAddress offset */], 4);
> +    return le32_to_cpu(rsdt_physical_address);
> +}
> +
> +uint64_t acpi_get_xsdt_address(uint8_t *rsdp_table)
> +{
> +    uint64_t xsdt_physical_address;
> +    uint8_t revision = rsdp_table[15 /* Revision offset */];
> +
> +    /* We must have revision 2 if we're looking for an XSDT pointer */
> +    g_assert(revision == 2);
> +
> +    memcpy(&xsdt_physical_address, &rsdp_table[24 /* XsdtAddress offset */], 8);
> +    return le64_to_cpu(xsdt_physical_address);
> +}
> +
> +void acpi_parse_rsdp_table(uint32_t addr, uint8_t *rsdp_table)
> +{
> +    uint8_t revision;
> +
> +    /* Read mandatory revision 0 table data (20 bytes) first */
> +    memread(addr, rsdp_table, 20);
> +    revision = rsdp_table[15 /* Revision offset */];
> +
> +    switch (revision) {
> +    case 0: /* ACPI 1.0 RSDP */
> +        break;
> +    case 2: /* ACPI 2.0+ RSDP */
> +        /* Read the rest of the RSDP table */
> +        memread(addr + 20, rsdp_table + 20, 16);
> +        break;
> +    default:
> +        g_assert_not_reached();
> +    }
> +
> +    ACPI_ASSERT_CMP64(*((uint64_t *)(rsdp_table)), "RSD PTR ");
>  }
> diff --git a/tests/bios-tables-test.c b/tests/bios-tables-test.c
> index d661d9be62..8749b77b36 100644
> --- a/tests/bios-tables-test.c
> +++ b/tests/bios-tables-test.c
> @@ -27,7 +27,7 @@ typedef struct {
>      const char *machine;
>      const char *variant;
>      uint32_t rsdp_addr;
> -    AcpiRsdpDescriptor rsdp_table;
> +    uint8_t rsdp_table[36 /* ACPI 2.0+ RSDP size */];
>      AcpiRsdtDescriptorRev1 rsdt_table;
>      uint32_t dsdt_addr;
>      uint32_t facs_addr;
> @@ -85,19 +85,30 @@ static void test_acpi_rsdp_address(test_data *data)
>  
>  static void test_acpi_rsdp_table(test_data *data)
>  {
> -    AcpiRsdpDescriptor *rsdp_table = &data->rsdp_table;
> +    uint8_t *rsdp_table = data->rsdp_table, revision;
>      uint32_t addr = data->rsdp_addr;
>  
>      acpi_parse_rsdp_table(addr, rsdp_table);
> +    revision = rsdp_table[15 /* Revision offset */];
>  
> -    /* rsdp checksum is not for the whole table, but for the first 20 bytes */
> -    g_assert(!acpi_calc_checksum((uint8_t *)rsdp_table, 20));
> +    switch (revision) {
> +    case 0: /* ACPI 1.0 RSDP */
> +        /* With rev 1, checksum is only for the first 20 bytes */
> +        g_assert(!acpi_calc_checksum(rsdp_table,  20));
> +        break;
> +    case 2: /* ACPI 2.0+ RSDP */
> +        /* With revision 2, we have 2 checksums */
> +        g_assert(!acpi_calc_checksum(rsdp_table, 20));
> +        g_assert(!acpi_calc_checksum(rsdp_table, 36));
> +    default:
> +        g_assert_not_reached();
> +    }
>  }
>  
>  static void test_acpi_rsdt_table(test_data *data)
>  {
>      AcpiRsdtDescriptorRev1 *rsdt_table = &data->rsdt_table;
> -    uint32_t addr = le32_to_cpu(data->rsdp_table.rsdt_physical_address);
> +    uint32_t addr = acpi_get_rsdt_address(data->rsdp_table);
>      uint32_t *tables;
>      int tables_nr;
>      uint8_t checksum;
> diff --git a/tests/vmgenid-test.c b/tests/vmgenid-test.c
> index 0a6fb55f2e..97219ae86c 100644
> --- a/tests/vmgenid-test.c
> +++ b/tests/vmgenid-test.c
> @@ -35,7 +35,7 @@ static uint32_t acpi_find_vgia(void)
>  {
>      uint32_t rsdp_offset;
>      uint32_t guid_offset = 0;
> -    AcpiRsdpDescriptor rsdp_table;
> +    uint8_t rsdp_table[36 /* ACPI 2.0+ RSDP size */];
>      uint32_t rsdt, rsdt_table_length;
>      AcpiRsdtDescriptorRev1 rsdt_table;
>      size_t tables_nr;
> @@ -52,9 +52,11 @@ static uint32_t acpi_find_vgia(void)
>  
>      g_assert_cmphex(rsdp_offset, <, RSDP_ADDR_INVALID);
>  
> -    acpi_parse_rsdp_table(rsdp_offset, &rsdp_table);
> +    acpi_parse_rsdp_table(rsdp_offset, rsdp_table);
> +
> +    rsdt = acpi_get_rsdt_address(rsdp_table);
> +    g_assert(rsdt);
>  
> -    rsdt = le32_to_cpu(rsdp_table.rsdt_physical_address);
>      /* read the header */
>      ACPI_READ_TABLE_HEADER(&rsdt_table, rsdt);
>      ACPI_ASSERT_CMP(rsdt_table.signature, "RSDT");