Currently, there is no way to access the system registers on Morello without writing inline assembly statements for each access. This patch directly adds the {read, write, clear}_cap_sysreg helper functions to sysreg.h
Signed-off-by: Akram Ahmad Akram.Ahmad@arm.com --- arch/arm64/include/asm/sysreg.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index 9988e289ce20..6ab068851422 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -1134,6 +1134,24 @@ asm volatile(__msr_s(r, "%x0") : : "rZ" (__val)); \ } while (0)
+#ifdef CONFIG_ARM64_MORELLO +#define read_cap_sysreg(r) ({ \ + uintcap_t __cap; \ + asm volatile("mrs %0, " __stringify(r) : "=r" (__cap)); \ + __cap; \ +}) + +#define write_cap_sysreg(v, r) do { \ + uintcap_t __cap = (uintcap_t)(v); \ + asm volatile("msr " __stringify(r) ", %0" \ + : : "rZ" (__cap)); \ +} while (0) + +#define clear_cap_sysreg(r) ({ \ + write_cap_sysreg(0, r); \ +}) +#endif + /* * Modify bits in a sysreg. Bits in the clear mask are zeroed, then bits in the * set mask are set. Other bits are left as-is.