diff options
| author | Leon Alrae <leon.alrae@imgtec.com> | 2014-07-07 11:23:58 +0100 |
|---|---|---|
| committer | Leon Alrae <leon.alrae@imgtec.com> | 2014-11-03 11:48:34 +0000 |
| commit | 2fb58b73746e2f99ac85e82160277b18b18279be (patch) | |
| tree | cedded3812b8bd8cf5718c655420673c3a6b6ba7 /target-mips/op_helper.c | |
| parent | 9f6bcedba61927438000fb94b0706c22dfb87eaa (diff) | |
target-mips: add RI and XI fields to TLB entry
In Revision 3 of the architecture, the RI and XI bits were added to the TLB
to enable more secure access of memory pages. These bits (along with the Dirty
bit) allow the implementation of read-only, write-only, no-execute access
policies for mapped pages.
Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
Reviewed-by: Yongbok Kim <yongbok.kim@imgtec.com>
Diffstat (limited to 'target-mips/op_helper.c')
| -rw-r--r-- | target-mips/op_helper.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/target-mips/op_helper.c b/target-mips/op_helper.c index 9ec548cc02..582c84e1a4 100644 --- a/target-mips/op_helper.c +++ b/target-mips/op_helper.c @@ -1849,10 +1849,14 @@ static void r4k_fill_tlb(CPUMIPSState *env, int idx) tlb->V0 = (env->CP0_EntryLo0 & 2) != 0; tlb->D0 = (env->CP0_EntryLo0 & 4) != 0; tlb->C0 = (env->CP0_EntryLo0 >> 3) & 0x7; + tlb->XI0 = (env->CP0_EntryLo0 >> CP0EnLo_XI) & 1; + tlb->RI0 = (env->CP0_EntryLo0 >> CP0EnLo_RI) & 1; tlb->PFN[0] = (env->CP0_EntryLo0 >> 6) << 12; tlb->V1 = (env->CP0_EntryLo1 & 2) != 0; tlb->D1 = (env->CP0_EntryLo1 & 4) != 0; tlb->C1 = (env->CP0_EntryLo1 >> 3) & 0x7; + tlb->XI1 = (env->CP0_EntryLo1 >> CP0EnLo_XI) & 1; + tlb->RI1 = (env->CP0_EntryLo1 >> CP0EnLo_RI) & 1; tlb->PFN[1] = (env->CP0_EntryLo1 >> 6) << 12; } @@ -1964,8 +1968,12 @@ void r4k_helper_tlbr(CPUMIPSState *env) env->CP0_EntryHi = tlb->VPN | tlb->ASID; env->CP0_PageMask = tlb->PageMask; env->CP0_EntryLo0 = tlb->G | (tlb->V0 << 1) | (tlb->D0 << 2) | + ((target_ulong)tlb->RI0 << CP0EnLo_RI) | + ((target_ulong)tlb->XI0 << CP0EnLo_XI) | (tlb->C0 << 3) | (tlb->PFN[0] >> 6); env->CP0_EntryLo1 = tlb->G | (tlb->V1 << 1) | (tlb->D1 << 2) | + ((target_ulong)tlb->RI1 << CP0EnLo_RI) | + ((target_ulong)tlb->XI1 << CP0EnLo_XI) | (tlb->C1 << 3) | (tlb->PFN[1] >> 6); } |