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[libcpu][risc-v] fix the bug when using ASID in the RV64 MMU. #9511

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Merged
merged 2 commits into from
Oct 11, 2024
Merged

[libcpu][risc-v] fix the bug when using ASID in the RV64 MMU. #9511

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41346ab
(fix) mmu: satp value should be 64-bit
zhangjing0303 Sep 13, 2024
6b07e1e
use __asm__ instead of asm for the GNU C compiler
zhangjing0303 Oct 11, 2024
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3 changes: 2 additions & 1 deletion libcpu/risc-v/common64/asid.c
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Original file line number Diff line number Diff line change
Expand Up @@ -29,9 +29,10 @@ static rt_uint64_t global_asid_generation;

void rt_hw_asid_init(void)
{
unsigned int satp_reg = read_csr(satp);
rt_uint64_t satp_reg = read_csr(satp);
satp_reg |= (((rt_uint64_t)0xffff) << PPN_BITS);
write_csr(satp, satp_reg);
__asm__ volatile("sfence.vma x0, x0");
unsigned short valid_asid_bit = ((read_csr(satp) >> PPN_BITS) & 0xffff);

// The maximal value of ASIDLEN, is 9 for Sv32 or 16 for Sv39, Sv48, and Sv57
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