Commit be0c46d4 authored by Sandipan Das's avatar Sandipan Das Committed by David Gibson
Browse files

target-ppc: Extend HWCAP2 bits for ISA 3.0 



This adds the HWCAP2 bit to detect if a linux user process is
running on an ISA 3.0 compliant cpu like POWER9. This can be
verified using a simple test program that prints the value in
the auxiliary vector for AT_HWCAP2 as shown below.

Before:
  $ qemu-ppc64le -cpu power8 test
  0x8c000000

  $ qemu-ppc64le -cpu power9 test
  0x8c000000

After:
  $ qemu-ppc64le -cpu power8 test
  0x8c000000

  $ qemu-ppc64le -cpu power9 test
  0x8c800000

Signed-off-by: default avatarSandipan Das <sandipan@linux.ibm.com>
Reviewed-by: default avatarLaurent Vivier <laurent@vivier.eu>
Signed-off-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
parent a84f7179

linux-user/elfload.c

+2 −0
Original line number Diff line number Diff line
@@ -710,6 +710,7 @@ enum { 
    QEMU_PPC_FEATURE2_HAS_EBB = 0x10000000, /* Event Base Branching */

    QEMU_PPC_FEATURE2_HAS_ISEL = 0x08000000, /* Integer Select */

    QEMU_PPC_FEATURE2_HAS_TAR = 0x04000000, /* Target Address Register */

    QEMU_PPC_FEATURE2_ARCH_3_00 = 0x00800000, /* ISA 3.00 */

};



#define ELF_HWCAP get_elf_hwcap()
@@ -764,6 +765,7 @@ static uint32_t get_elf_hwcap2(void) 
    GET_FEATURE2(PPC2_BCTAR_ISA207, QEMU_PPC_FEATURE2_HAS_TAR);

    GET_FEATURE2((PPC2_BCTAR_ISA207 | PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 |

                  PPC2_ISA207S), QEMU_PPC_FEATURE2_ARCH_2_07);

    GET_FEATURE2(PPC2_ISA300, QEMU_PPC_FEATURE2_ARCH_3_00);



#undef GET_FEATURE

#undef GET_FEATURE2