diff options
Diffstat (limited to 'sys/mips/mips/swtch.S')
| -rw-r--r-- | sys/mips/mips/swtch.S | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/sys/mips/mips/swtch.S b/sys/mips/mips/swtch.S index 699c206..8b285dd 100644 --- a/sys/mips/mips/swtch.S +++ b/sys/mips/mips/swtch.S @@ -250,6 +250,61 @@ NON_LEAF(cpu_switch, CALLFRAME_SIZ, ra) getpc: SAVE_U_PCB_CONTEXT(ra, PREG_PC, a0) # save return address +#ifdef CPU_CNMIPS + + lw t2, TD_MDFLAGS(a3) # get md_flags + and t1, t2, MDTD_COP2USED + beqz t1, cop2_untouched + nop + + /* Clear cop2used flag */ + and t2, t2, ~MDTD_COP2USED + sw t2, TD_MDFLAGS(a3) + + and t2, t0, ~MIPS_SR_COP_2_BIT # clear COP_2 enable bit + SAVE_U_PCB_CONTEXT(t2, PREG_SR, a0) # save status register + + RESTORE_U_PCB_REG(t0, PS, a0) # get CPU status register + and t2, t0, ~MIPS_SR_COP_2_BIT # clear COP_2 enable bit + SAVE_U_PCB_REG(t2, PS, a0) # save stratus register + + /* preserve a0..a3 */ + move s0, a0 + move s1, a1 + move s2, a2 + move s3, a3 + + /* does kernel own COP2 context? */ + lw t1, TD_COP2OWNER(a3) # get md_cop2owner + beqz t1, userland_cop2 # 0 - it's userland context + nop + + PTR_L a0, TD_COP2(a3) + beqz a0, no_cop2_context + nop + + j do_cop2_save + nop + +userland_cop2: + + PTR_L a0, TD_UCOP2(a3) + beqz a0, no_cop2_context + nop + +do_cop2_save: + jal octeon_cop2_save + nop + +no_cop2_context: + move a3, s3 + move a2, s2 + move a1, s1 + move a0, s0 + +cop2_untouched: +#endif + PTR_S a2, TD_LOCK(a3) # Switchout td_lock mips_sw1: |
