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target/mips: Add segmentation control registers

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The optional segmentation control registers CP0_SegCtl0, CP0_SegCtl1 &
CP0_SegCtl2 control the behaviour and required privilege of the legacy
virtual memory segments.

Add them to the CP0 interface so they can be read and written when
CP0_Config3.SC=1, and initialise them to describe the standard legacy
layout so they can be used in future patches regardless of whether they
are exposed to the guest.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Yongbok Kim <yongbok.kim@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Yongbok Kim <yongbok.kim@imgtec.com>
Signed-off-by: Yongbok Kim <yongbok.kim@imgtec.com>
This commit is contained in:
James Hogan 2017-07-18 12:55:56 +01:00 • committed by Yongbok Kim
parent 42c86612d5
commit cec56a733d
5 changed files with 150 additions and 2 deletions
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24
target/mips/op_helper.c
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@ -1322,6 +1322,30 @@ void helper_mtc0_pagegrain(CPUMIPSState *env, target_ulong arg1)
restore_pamask(env);
}
void helper_mtc0_segctl0(CPUMIPSState *env, target_ulong arg1)
{
CPUState *cs = CPU(mips_env_get_cpu(env));
env->CP0_SegCtl0 = arg1 & CP0SC0_MASK;
tlb_flush(cs);
}
void helper_mtc0_segctl1(CPUMIPSState *env, target_ulong arg1)
{
CPUState *cs = CPU(mips_env_get_cpu(env));
env->CP0_SegCtl1 = arg1 & CP0SC1_MASK;
tlb_flush(cs);
}
void helper_mtc0_segctl2(CPUMIPSState *env, target_ulong arg1)
{
CPUState *cs = CPU(mips_env_get_cpu(env));
env->CP0_SegCtl2 = arg1 & CP0SC2_MASK;
tlb_flush(cs);
}
void helper_mtc0_wired(CPUMIPSState *env, target_ulong arg1)
{
if (env->insn_flags & ISA_MIPS32R6) {