aarch64: Add AmpereComputing emag to tunable cpu list

Emag is a 64-bit CPU core released by AmpereComputing.

Add its name to cpu list, and corresponding macro as utilities for
later IFUNC dispatch.

    * manual/tunables.texi (Tunable glibc.cpu.name): Add emag.
    * sysdeps/unix/sysv/linux/aarch64/cpu-features.c (cpu_list):
    Add emag.
    * sysdeps/unix/sysv/linux/aarch64/cpu-features.h (IS_EMAG):
    New macro.

diff --git a/ChangeLog b/ChangeLog
index 25a644f..2e51ea4 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2019-02-01  Feng Xue  <fxue@os.amperecomputing.com>
+
+       * manual/tunables.texi (Tunable glibc.cpu.name): Add emag.
+       * sysdeps/unix/sysv/linux/aarch64/cpu-features.c (cpu_list):
+       Add emag.
+       * sysdeps/unix/sysv/linux/aarch64/cpu-features.h (IS_EMAG):
+       New macro.
+
 2019-02-01  Stefan Liebler  <stli@linux.ibm.com>
 
        * posix/tst-spawn do_test(): Move waitpid before posix_spawn.

diff --git a/manual/tunables.texi b/manual/tunables.texi
index af82082..749cabf 100644 (file)
--- a/manual/tunables.texi
+++ b/manual/tunables.texi
@@ -360,7 +360,7 @@ This tunable is specific to powerpc, powerpc64 and powerpc64le.
 The @code{glibc.cpu.name=xxx} tunable allows the user to tell @theglibc{} to
 assume that the CPU is @code{xxx} where xxx may have one of these values:
 @code{generic}, @code{falkor}, @code{thunderxt88}, @code{thunderx2t99},
-@code{thunderx2t99p1}, @code{ares}.
+@code{thunderx2t99p1}, @code{ares}, @code{emag}.
 
 This tunable is specific to aarch64.
 @end deftp

diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
index 4243ced..28dfcef 100644 (file)
--- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
+++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
@@ -37,6 +37,7 @@ static struct cpu_list cpu_list[] = {
       {"thunderx2t99p1", 0x420F5160},
       {"phecda",        0x680F0000},
       {"ares",          0x411FD0C0},
+      {"emag",          0x503F0001},
       {"generic",       0x0}
 };
 

diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.h b/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
index 6f8b35f..1273911 100644 (file)
--- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
+++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.h
@@ -54,6 +54,9 @@
 #define IS_ARES(midr) (MIDR_IMPLEMENTOR(midr) == 'A'                         \
                        && MIDR_PARTNUM(midr) == 0xd0c)
 
+#define IS_EMAG(midr) (MIDR_IMPLEMENTOR(midr) == 'P'                         \
+                       && MIDR_PARTNUM(midr) == 0x000)
+
 struct cpu_features
 {
   uint64_t midr_el1;