Re: [Qemu-devel] [RESEND PATCH 14/23] hw/acpi/aml-build: Add ToUUID macro

[Igor Mammedov <imammedo@redhat.com>]

On Wed, 20 May 2015 12:19:55 +0800
Shannon Zhao <zhaoshenglong@huawei.com> wrote:

> From: Shannon Zhao <shannon.zhao@linaro.org>
> 
> Add ToUUID macro, this is useful for generating PCIe ACPI table.
> 
> Signed-off-by: Shannon Zhao <zhaoshenglong@huawei.com>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Please remove my RB in cases when changes in patch are not trivial.

> ---
>  hw/acpi/aml-build.c         | 112 ++++++++++++++++++++++++++++++++++++++++++++
>  include/hw/acpi/aml-build.h |   1 +
>  2 files changed, 113 insertions(+)
> 
> diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
> index 7fcc44e..bdcbad2 100644
> --- a/hw/acpi/aml-build.c
> +++ b/hw/acpi/aml-build.c
> @@ -28,6 +28,8 @@
>  #include "qemu/bswap.h"
>  #include "qemu/bitops.h"
>  #include "hw/acpi/bios-linker-loader.h"
> +#include "qapi/error.h"
> +#include "qemu-common.h"
>  
>  static GArray *build_alloc_array(void)
>  {
> @@ -955,6 +957,116 @@ Aml *aml_qword_memory(AmlDecode dec, AmlMinFixed min_fixed,
>                               addr_trans, len, flags);
>  }
>  
> +static void String2Byte(const char *str, uint8_t *byte_list)
> +{
> +    unsigned long long val;
> +    char *end;
> +    const char *start = str;
> +    int i, j = 0;
> +    Error *err = NULL;
> +
> +    if (strlen(str) != 36) {
> +        error_setg(&err, "Length of UUID string is not 36");
> +        goto error;
> +    }
> +
> +    val = strtoull(start, &end, 16);
> +    if ((end - start) != 8) {
> +        error_setg(&err, "Length of first part of UUID string is not 8");
> +        goto error;
> +    }
> +    for (i = 3; i >= 0; i--) {
> +        byte_list[j] = extract32(val, (8 * i), 8);
> +        j++;
> +    }
> +    start = end + 1;
> +
> +    val = strtoull(start, &end, 16);
> +    if ((end - start) != 4) {
> +        error_setg(&err, "Length of second part of UUID string is not 4");
> +        goto error;
> +    }
> +    for (i = 1; i >= 0; i--) {
> +        byte_list[j] = extract32(val, (8 * i), 8);
> +        j++;
> +    }
> +    start = end + 1;
> +
> +    val = strtoull(start, &end, 16);
> +    if ((end - start) != 4) {
> +        error_setg(&err, "Length of third part of UUID string is not 4");
> +        goto error;
> +    }
> +    for (i = 1; i >= 0; i--) {
> +        byte_list[j] = extract32(val, (8 * i), 8);
> +        j++;
> +    }
> +    start = end + 1;
> +
> +    val = strtoull(start, &end, 16);
> +    if ((end - start) != 4) {
> +        error_setg(&err, "Length of fourth part of UUID string is not 4");
> +        goto error;
> +    }
> +    for (i = 1; i >= 0; i--) {
> +        byte_list[j] = extract32(val, (8 * i), 8);
> +        j++;
> +    }
> +    start = end + 1;
> +
> +    val = strtoull(start, &end, 16);
> +    if ((end - start) != 12) {
> +        error_setg(&err, "Length of fifth part of UUID string is not 12");
> +        goto error;
> +    }
> +    for (i = 5; i >= 0; i--) {
> +        byte_list[j] = extract64(val, (8 * i), 8);
> +        j++;
> +    }
> +
> +    return;
> +
> +error:
> +    error_report_err(err);
> +    exit(1);
> +}
To me this looks just crazy,
I find the previous patch much easier to read/understand

maybe previous patch +separated asserts as was suggested
an earlier.


> +
> +/*
> + * ACPI 3.0: 17.5.124 ToUUID (Convert String to UUID Macro)
> + * e.g. UUID: aabbccdd-eeff-gghh-iijj-kkllmmnnoopp
> + * call aml_touuid("aabbccdd-eeff-gghh-iijj-kkllmmnnoopp");
> + */
> +Aml *aml_touuid(const char *uuid)
> +{
> +    Aml *var = aml_bundle(0x11 /* BufferOp */, AML_BUFFER);
> +    uint8_t byte_list[16];
> +
> +    String2Byte(uuid, byte_list);
> +
> +    build_append_byte(var->buf, byte_list[3]); /* dd - at offset 00 */
> +    build_append_byte(var->buf, byte_list[2]); /* cc - at offset 01 */
> +    build_append_byte(var->buf, byte_list[1]); /* bb - at offset 02 */
> +    build_append_byte(var->buf, byte_list[0]); /* aa - at offset 03 */
> +
> +    build_append_byte(var->buf, byte_list[5]); /* ff - at offset 04 */
> +    build_append_byte(var->buf, byte_list[4]); /* ee - at offset 05 */
> +
> +    build_append_byte(var->buf, byte_list[7]); /* hh - at offset 06 */
> +    build_append_byte(var->buf, byte_list[6]); /* gg - at offset 07 */
> +
> +    build_append_byte(var->buf, byte_list[8]); /* ii - at offset 08 */
> +    build_append_byte(var->buf, byte_list[9]); /* jj - at offset 09 */
> +
> +    build_append_byte(var->buf, byte_list[10]); /* kk - at offset 10 */
> +    build_append_byte(var->buf, byte_list[11]); /* ll - at offset 11 */
> +    build_append_byte(var->buf, byte_list[12]); /* mm - at offset 12 */
> +    build_append_byte(var->buf, byte_list[13]); /* nn - at offset 13 */
> +    build_append_byte(var->buf, byte_list[14]); /* oo - at offset 14 */
> +    build_append_byte(var->buf, byte_list[15]); /* pp - at offset 15 */
> +
> +    return var;
> +}
> +
>  void
>  build_header(GArray *linker, GArray *table_data,
>               AcpiTableHeader *h, const char *sig, int len, uint8_t rev)
> diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
> index fac70ea..a873b46 100644
> --- a/include/hw/acpi/aml-build.h
> +++ b/include/hw/acpi/aml-build.h
> @@ -257,6 +257,7 @@ Aml *aml_buffer(int buffer_size, uint8_t *byte_list);
>  Aml *aml_resource_template(void);
>  Aml *aml_field(const char *name, AmlAccessType type, AmlUpdateRule rule);
>  Aml *aml_varpackage(uint32_t num_elements);
> +Aml *aml_touuid(const char *uuid);
>  
>  void
>  build_header(GArray *linker, GArray *table_data,