Firmware/opensbi
8
0
Fork 0
forked from Mirrors/opensbi
Code Pull Requests Activity

lib: Add RISC-V hypervisor v0.6.1 support

Browse Source 
To support RISC-V hypervisor v0.6.1, we:
1. Don't need to explicitly forward WFI traps from VS/VU-mode
2. Have to delegate virtual instruction trap to HS-mode
3. Have to update trap redirection for changes in HSTATUS CSR

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-05-28 08:37:42 +05:30
committed by Anup Patel
parent 51f0e4a053
commit 1b8c0128f1
4 changed files with 17 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
lib/sbi/sbi_hart.c
View File

@@ -110,6 +110,7 @@ static int delegate_traps(struct sbi_scratch *scratch, u32 hartid)
exceptions |= (1U << CAUSE_SUPERVISOR_ECALL);
exceptions |= (1U << CAUSE_FETCH_GUEST_PAGE_FAULT);
exceptions |= (1U << CAUSE_LOAD_GUEST_PAGE_FAULT);
exceptions |= (1U << CAUSE_VIRTUAL_INST_FAULT);
exceptions |= (1U << CAUSE_STORE_GUEST_PAGE_FAULT);
}

12
lib/sbi/sbi_illegal_insn.c
View File

@@ -38,17 +38,7 @@ static int system_opcode_insn(ulong insn, struct sbi_trap_regs *regs)
int csr_num = (u32)insn >> 20;
ulong csr_val, new_csr_val;
/*
* WFI always traps as illegal instruction when executed from
* VS/VU mode so we just forward it to HS-mode.
*/
#if __riscv_xlen == 32
if ((regs->mstatusH & MSTATUSH_MPV) &&
#else
if ((regs->mstatus & MSTATUS_MPV) &&
#endif
(insn & INSN_MASK_WFI) == INSN_MATCH_WFI)
return truly_illegal_insn(insn, regs);
/* TODO: Ensure that we got CSR read/write instruction */
if (sbi_emulate_csr_read(csr_num, regs, &csr_val))
return truly_illegal_insn(insn, regs);

8
lib/sbi/sbi_trap.c
View File

@@ -120,12 +120,10 @@ int sbi_trap_redirect(struct sbi_trap_regs *regs,
/* Update HSTATUS for VS/VU-mode to HS-mode transition */
if (misa_extension('H') && prev_virt && !next_virt) {
/* Update HSTATUS SP2P, SP2V, and SPV bits */
/* Update HSTATUS SPVP and SPV bits */
hstatus = csr_read(CSR_HSTATUS);
hstatus &= ~HSTATUS_SP2P;
hstatus |= (regs->mstatus & MSTATUS_SPP) ? HSTATUS_SP2P : 0;
hstatus &= ~HSTATUS_SP2V;
hstatus |= (hstatus & HSTATUS_SPV) ? HSTATUS_SP2V : 0;
hstatus &= ~HSTATUS_SPVP;
hstatus |= (regs->mstatus & MSTATUS_SPP) ? HSTATUS_SPVP : 0;
hstatus &= ~HSTATUS_SPV;
hstatus |= (prev_virt) ? HSTATUS_SPV : 0;
csr_write(CSR_HSTATUS, hstatus);