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ppcmmu: implement BAT protection.

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This commit is contained in:
Maxim Poliakovski 2020-01-30 00:57:45 +01:00
parent 354b7b65be
commit 043aedb9ad
1 changed files with 10 additions and 3 deletions
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13
cpu/ppc/ppcmmu.cpp
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@ -10,7 +10,6 @@
/* TODO:
- implement TLB
- implement 601-style BATs
- implement BAT access check
- add proper error and exception handling
- clarify what to do in the case of unaligned memory accesses
*/
@ -295,7 +294,10 @@ static uint32_t ppc_mmu_instr_translate(uint32_t la)
if ((bat_entry->access & access_bits) &&
((la & ~bat_entry->lo_mask) == bat_entry->bepi)) {
bat_hit = true;
// TODO: check access
if (!bat_entry->prot) {
ppc_exception_handler(Except_Type::EXC_ISI, 0x08000000);
}
// logical to physical translation
pa = bat_entry->phys_hi | (la & bat_entry->lo_mask);
@ -334,7 +336,12 @@ static uint32_t ppc_mmu_addr_translate(uint32_t la, int is_write)
if ((bat_entry->access & access_bits) &&
((la & ~bat_entry->lo_mask) == bat_entry->bepi)) {
bat_hit = true;
// TODO: check access
if (!bat_entry->prot || ((bat_entry->prot & 1) && is_write)) {
ppc_state.ppc_spr[SPR::DSISR] = 0x08000000 | (is_write << 25);
ppc_state.ppc_spr[SPR::DAR] = la;
ppc_exception_handler(Except_Type::EXC_DSI, 0);
}
// logical to physical translation
pa = bat_entry->phys_hi | (la & bat_entry->lo_mask);