[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>
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@ -1003,6 +1003,7 @@ static void cleanup_tc(struct tc *tc)
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write_tc_c0_tcstatus(tmp);
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write_tc_c0_tchalt(TCHALT_H);
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mips_ihb();
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/* bind it to anything other than VPE1 */
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// write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // | TCBIND_CURVPE
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@ -1235,9 +1236,12 @@ int vpe_free(vpe_handle vpe)
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settc(t->index);
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write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);
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/* mark the TC unallocated and halt'ed */
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write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
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/* halt the TC */
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write_tc_c0_tchalt(TCHALT_H);
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mips_ihb();
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/* mark the TC unallocated */
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write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
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v->state = VPE_STATE_UNUSED;
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@ -1533,14 +1537,16 @@ static int __init vpe_module_init(void)
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t->pvpe = get_vpe(0); /* set the parent vpe */
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}
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/* halt the TC */
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write_tc_c0_tchalt(TCHALT_H);
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mips_ihb();
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tmp = read_tc_c0_tcstatus();
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/* mark not activated and not dynamically allocatable */
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tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
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tmp |= TCSTATUS_IXMT; /* interrupt exempt */
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write_tc_c0_tcstatus(tmp);
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write_tc_c0_tchalt(TCHALT_H);
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}
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}
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