diff options
| author | Nigel Stephens <nigel@mips.com> | 2007-11-08 13:25:51 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2007-11-15 23:21:50 +0000 |
| commit | 7c3a622d9c8e88117a8d647756827852dd8c8432 (patch) | |
| tree | e30d2274855e61cab96cc4abebcab7e69263c641 /arch/mips/kernel | |
| parent | 8dfa741f146b39eb59ef2094e03f47079ca99eb0 (diff) | |
[MIPS] vpe: handle halting TCs in an errata safe way.
Adds a JR.HB after halting a TC, to ensure that the TC has really halted.
only modifies the TCSTATUS register when the TC is safely halted.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel')
| -rw-r--r-- | arch/mips/kernel/vpe.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c index 436a64ff398..38bd33fa2a2 100644 --- a/arch/mips/kernel/vpe.c +++ b/arch/mips/kernel/vpe.c @@ -1003,6 +1003,7 @@ static void cleanup_tc(struct tc *tc) write_tc_c0_tcstatus(tmp); write_tc_c0_tchalt(TCHALT_H); + mips_ihb(); /* bind it to anything other than VPE1 */ // write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE @@ -1235,9 +1236,12 @@ int vpe_free(vpe_handle vpe) settc(t->index); write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA); - /* mark the TC unallocated and halt'ed */ - write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A); + /* halt the TC */ write_tc_c0_tchalt(TCHALT_H); + mips_ihb(); + + /* mark the TC unallocated */ + write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A); v->state = VPE_STATE_UNUSED; @@ -1533,14 +1537,16 @@ static int __init vpe_module_init(void) t->pvpe = get_vpe(0); /* set the parent vpe */ } + /* halt the TC */ + write_tc_c0_tchalt(TCHALT_H); + mips_ihb(); + tmp = read_tc_c0_tcstatus(); /* mark not activated and not dynamically allocatable */ tmp &= ~(TCSTATUS_A | TCSTATUS_DA); tmp |= TCSTATUS_IXMT; /* interrupt exempt */ write_tc_c0_tcstatus(tmp); - - write_tc_c0_tchalt(TCHALT_H); } } |