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| author | neel <neel@FreeBSD.org> | 2014-05-14 22:24:09 +0000 |
|---|---|---|
| committer | neel <neel@FreeBSD.org> | 2014-05-14 22:24:09 +0000 |
| commit | 5df866f4b184bed9ee5696646c5f344532ca9194 (patch) | |
| tree | 398b47711331c96a2e9d3e3eddbe70ee15fcf641 /sys/amd64/amd64/mp_machdep.c | |
| parent | 10498d9298eec5778c1af445b70a940b4a61f5b8 (diff) | |
| download | FreeBSD-src-5df866f4b184bed9ee5696646c5f344532ca9194.zip FreeBSD-src-5df866f4b184bed9ee5696646c5f344532ca9194.tar.gz | |
Increase the TSS limit by one byte. The processor requires an additional byte
with all bits set to 1 beyond the I/O permission bitmap.
Prior to this change accessing I/O ports [0xFFF8-0xFFFF] would trigger a
#GP fault even though the I/O bitmap allowed access to those ports.
For more details see section "I/O Permission Bit Map" in the Intel SDM, Vol 1.
Reviewed by: kib
Diffstat (limited to 'sys/amd64/amd64/mp_machdep.c')
| -rw-r--r-- | sys/amd64/amd64/mp_machdep.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/amd64/amd64/mp_machdep.c b/sys/amd64/amd64/mp_machdep.c index 484fc06..6e59645 100644 --- a/sys/amd64/amd64/mp_machdep.c +++ b/sys/amd64/amd64/mp_machdep.c @@ -637,7 +637,7 @@ init_secondary(void) common_tss[cpu] = common_tss[0]; common_tss[cpu].tss_rsp0 = 0; /* not used until after switch */ common_tss[cpu].tss_iobase = sizeof(struct amd64tss) + - IOPAGES * PAGE_SIZE; + IOPERM_BITMAP_SIZE; common_tss[cpu].tss_ist1 = (long)&doublefault_stack[PAGE_SIZE]; /* The NMI stack runs on IST2. */ |
