diff options
Diffstat (limited to 'lib/sbi/sbi_dbtr.c')
| -rw-r--r-- | lib/sbi/sbi_dbtr.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/lib/sbi/sbi_dbtr.c b/lib/sbi/sbi_dbtr.c index 9c92af6..6e2083e 100644 --- a/lib/sbi/sbi_dbtr.c +++ b/lib/sbi/sbi_dbtr.c @@ -47,13 +47,7 @@ static unsigned long hart_state_ptr_offset; _idx < _max; \ _idx++, _entry = ((_etype *)_base + _idx)) -#if __riscv_xlen == 64 #define DBTR_SHMEM_MAKE_PHYS(_p_hi, _p_lo) (_p_lo) -#elif __riscv_xlen == 32 -#define DBTR_SHMEM_MAKE_PHYS(_p_hi, _p_lo) (((u64)(_p_hi) << 32) | (_p_lo)) -#else -#error "Undefined XLEN" -#endif /* must call with hs != NULL */ static inline bool sbi_dbtr_shmem_disabled( @@ -277,6 +271,20 @@ int sbi_dbtr_setup_shmem(const struct sbi_domain *dom, unsigned long smode, if (shmem_phys_lo & SBI_DBTR_SHMEM_ALIGN_MASK) return SBI_ERR_INVALID_PARAM; + /* + * On RV32, the M-mode can only access the first 4GB of + * the physical address space because M-mode does not have + * MMU to access full 34-bit physical address space. + * So fail if the upper 32 bits of the physical address + * is non-zero on RV32. + * + * On RV64, kernel sets upper 64bit address part to zero. + * So fail if the upper 64bit of the physical address + * is non-zero on RV64. + */ + if (shmem_phys_hi) + return SBI_EINVALID_ADDR; + if (dom && !sbi_domain_check_addr(dom, DBTR_SHMEM_MAKE_PHYS(shmem_phys_hi, shmem_phys_lo), smode, SBI_DOMAIN_READ | SBI_DOMAIN_WRITE)) |