diff options
| author | Mark Brown <broonie@kernel.org> | 2023-01-16 19:04:46 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2023-01-20 15:23:06 +0300 |
| commit | ee072cf708048c0d718a88159ae7985dd96d316f (patch) | |
| tree | 3f2388c34a6242c53ac2f9d62acc9d675b64158f /arch/arm64/include | |
| parent | 95fcec713259d440626526ed96ff5d3bac6179ea (diff) | |
| download | linux-ee072cf708048c0d718a88159ae7985dd96d316f.tar.xz | |
arm64/sme: Implement signal handling for ZT
Add a new signal context type for ZT which is present in the signal frame
when ZA is enabled and ZT is supported by the system. In order to account
for the possible addition of further ZT registers in the future we make the
number of registers variable in the ABI, though currently the only possible
number is 1. We could just use a bare list head for the context since the
number of registers can be inferred from the size of the context but for
usability and future extensibility we define a header with the number of
registers and some reserved fields in it.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221208-arm64-sme2-v4-11-f2fa0aef982f@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/fpsimd.h | 3 | ||||
| -rw-r--r-- | arch/arm64/include/uapi/asm/sigcontext.h | 19 |
2 files changed, 19 insertions, 3 deletions
diff --git a/arch/arm64/include/asm/fpsimd.h b/arch/arm64/include/asm/fpsimd.h index 0ce4465644fc..67f2fb781f59 100644 --- a/arch/arm64/include/asm/fpsimd.h +++ b/arch/arm64/include/asm/fpsimd.h @@ -361,9 +361,6 @@ extern unsigned int sme_get_vl(void); extern int sme_set_current_vl(unsigned long arg); extern int sme_get_current_vl(void); -/* Will move with signal support */ -#define ZT_SIG_REG_SIZE 512 - /* * Return how many bytes of memory are required to store the full SME * specific state for task, given task's currently configured vector diff --git a/arch/arm64/include/uapi/asm/sigcontext.h b/arch/arm64/include/uapi/asm/sigcontext.h index 9525041e4a14..46e9072985a5 100644 --- a/arch/arm64/include/uapi/asm/sigcontext.h +++ b/arch/arm64/include/uapi/asm/sigcontext.h @@ -152,6 +152,14 @@ struct za_context { __u16 __reserved[3]; }; +#define ZT_MAGIC 0x5a544e01 + +struct zt_context { + struct _aarch64_ctx head; + __u16 nregs; + __u16 __reserved[3]; +}; + #endif /* !__ASSEMBLY__ */ #include <asm/sve_context.h> @@ -304,4 +312,15 @@ struct za_context { #define ZA_SIG_CONTEXT_SIZE(vq) \ (ZA_SIG_REGS_OFFSET + ZA_SIG_REGS_SIZE(vq)) +#define ZT_SIG_REG_SIZE 512 + +#define ZT_SIG_REG_BYTES (ZT_SIG_REG_SIZE / 8) + +#define ZT_SIG_REGS_OFFSET sizeof(struct zt_context) + +#define ZT_SIG_REGS_SIZE(n) (ZT_SIG_REG_BYTES * n) + +#define ZT_SIG_CONTEXT_SIZE(n) \ + (sizeof(struct zt_context) + ZT_SIG_REGS_SIZE(n)) + #endif /* _UAPI__ASM_SIGCONTEXT_H */ |