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#ifndef __ARM_CPUERRATA_H__
#define __ARM_CPUERRATA_H__
#include <asm/cpufeature.h>
#include <asm/alternative.h>
void check_local_cpu_errata(void);
void enable_errata_workarounds(void);
#define CHECK_WORKAROUND_HELPER(erratum, feature, arch) \
static inline bool check_workaround_##erratum(void) \
{ \
if ( !IS_ENABLED(arch) ) \
return false; \
else \
{ \
register_t ret; \
\
asm volatile (ALTERNATIVE("mov %0, #0", \
"mov %0, #1", \
feature) \
: "=r" (ret)); \
\
return unlikely(ret); \
} \
}
CHECK_WORKAROUND_HELPER(766422, ARM32_WORKAROUND_766422, CONFIG_ARM_32)
CHECK_WORKAROUND_HELPER(834220, ARM64_WORKAROUND_834220, CONFIG_ARM_64)
CHECK_WORKAROUND_HELPER(ssbd, ARM_SSBD, CONFIG_ARM_SSBD)
CHECK_WORKAROUND_HELPER(858921, ARM_WORKAROUND_858921,
CONFIG_ARM_ERRATUM_858921)
#undef CHECK_WORKAROUND_HELPER
enum ssbd_state
{
ARM_SSBD_UNKNOWN,
ARM_SSBD_FORCE_DISABLE,
ARM_SSBD_RUNTIME,
ARM_SSBD_FORCE_ENABLE,
ARM_SSBD_MITIGATED,
};
#ifdef CONFIG_ARM_SSBD
#include <asm/current.h>
extern enum ssbd_state ssbd_state;
static inline enum ssbd_state get_ssbd_state(void)
{
return ssbd_state;
}
DECLARE_PER_CPU(register_t, ssbd_callback_required);
static inline bool cpu_require_ssbd_mitigation(void)
{
return this_cpu(ssbd_callback_required);
}
#else
static inline bool cpu_require_ssbd_mitigation(void)
{
return false;
}
static inline enum ssbd_state get_ssbd_state(void)
{
return ARM_SSBD_UNKNOWN;
}
#endif
#endif /* __ARM_CPUERRATA_H__ */
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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