diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2014-03-03 07:34:46 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2014-03-04 08:06:32 +0000 |
| commit | 4cf761cdccc3b050f768f25dc36342cdfec4efdd (patch) | |
| tree | dd57fc3def90b6203be901773bc148850df13c3f /arch/arm64/kernel | |
| parent | 28964d32d495a0753986d464c48c8e1ae73699be (diff) | |
| download | linux-4cf761cdccc3b050f768f25dc36342cdfec4efdd.tar.gz linux-4cf761cdccc3b050f768f25dc36342cdfec4efdd.tar.bz2 linux-4cf761cdccc3b050f768f25dc36342cdfec4efdd.zip | |
arm64: advertise ARMv8 extensions to 32-bit compat ELF binaries
This adds support for advertising the presence of ARMv8 Crypto
Extensions in the Aarch32 execution state to 32-bit ELF binaries
running in 32-bit compat mode under the arm64 kernel.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/setup.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 349c49260f09..67da30741a1b 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -243,6 +243,38 @@ static void __init setup_processor(void) block = (features >> 16) & 0xf; if (block && !(block & 0x8)) elf_hwcap |= HWCAP_CRC32; + +#ifdef CONFIG_COMPAT + /* + * ID_ISAR5_EL1 carries similar information as above, but pertaining to + * the Aarch32 32-bit execution state. + */ + features = read_cpuid(ID_ISAR5_EL1); + block = (features >> 4) & 0xf; + if (!(block & 0x8)) { + switch (block) { + default: + case 2: + compat_elf_hwcap2 |= COMPAT_HWCAP2_PMULL; + case 1: + compat_elf_hwcap2 |= COMPAT_HWCAP2_AES; + case 0: + break; + } + } + + block = (features >> 8) & 0xf; + if (block && !(block & 0x8)) + compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA1; + + block = (features >> 12) & 0xf; + if (block && !(block & 0x8)) + compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA2; + + block = (features >> 16) & 0xf; + if (block && !(block & 0x8)) + compat_elf_hwcap2 |= COMPAT_HWCAP2_CRC32; +#endif } static void __init setup_machine_fdt(phys_addr_t dt_phys) |