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Fix interrupt and exception delegation
When S mode is not supported, simply clear mideleg and medeleg. Otherwise, set delegation from M-mode to S-mode, removing the page fault exceptions as those would not happen in M-mode. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
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9c183df632
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d403c70fb1
1 changed files with 12 additions and 10 deletions
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@ -77,17 +77,19 @@ static int fp_init(u32 hartid)
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static int delegate_traps(u32 hartid)
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{
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/* send S-mode interrupts and most exceptions straight to S-mode */
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unsigned long interrupts = MIP_SSIP | MIP_STIP | MIP_SEIP;
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unsigned long exceptions = (1U << CAUSE_MISALIGNED_FETCH) |
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(1U << CAUSE_FETCH_PAGE_FAULT) |
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(1U << CAUSE_BREAKPOINT) |
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(1U << CAUSE_LOAD_PAGE_FAULT) |
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(1U << CAUSE_STORE_PAGE_FAULT) |
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(1U << CAUSE_USER_ECALL);
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unsigned long interrupts, exceptions;
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if (!misa_extension('S'))
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return 0;
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if (!misa_extension('S')) {
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/* No delegation possible */
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interrupts = 0;
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exceptions = 0;
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} else {
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/* Send M-mode interrupts and most exceptions to S-mode */
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interrupts = MIP_SSIP | MIP_STIP | MIP_SEIP;
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exceptions = (1U << CAUSE_MISALIGNED_FETCH) |
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(1U << CAUSE_BREAKPOINT) |
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(1U << CAUSE_USER_ECALL);
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}
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csr_write(mideleg, interrupts);
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csr_write(medeleg, exceptions);
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