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Add a little protection logic.

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This commit is contained in:
Thomas Harte 2024-03-06 22:00:34 -05:00
parent 691a42d81e
commit 173fc9329a
1 changed files with 23 additions and 3 deletions
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26
Machines/Acorn/Archimedes/Archimedes.cpp
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@ -95,7 +95,7 @@ struct Memory {
low_rom_access_time_ = ROMAccessTime((address >> 4) & 3);
page_size_ = PageSize((address >> 2) & 3);
logger.info().append("MEMC Control: %08x/%08x -> OS:%d sound:%d video:%d high:%d low:%d size:%d", address, source, os_mode_, sound_dma_enable_, video_dma_enable_, high_rom_access_time_, low_rom_access_time_, page_size_);
logger.info().append("MEMC Control: %08x -> OS:%d sound:%d video:%d high:%d low:%d size:%d", address, os_mode_, sound_dma_enable_, video_dma_enable_, high_rom_access_time_, low_rom_access_time_, page_size_);
update_mapping();
return true;
@ -271,7 +271,7 @@ struct Memory {
std::array<MappedPage, 8192> mapping_;
template <typename IntT, bool is_read>
IntT *logical_ram(uint32_t address, InstructionSet::ARM::Mode) {
IntT *logical_ram(uint32_t address, InstructionSet::ARM::Mode mode) {
// TODO: (1) which logical page is this?
// logger.error().append("TODO: Logical RAM mapping at %08x", address);
@ -303,7 +303,23 @@ struct Memory {
return nullptr;
}
// TODO: consider protection level.
// TODO: eliminate switch here.
switch(mapping_[page].protection_level) {
case 0b00: break;
case 0b01:
if(!is_read && mode == InstructionSet::ARM::Mode::User) {
return nullptr;
}
break;
default:
if(mode == InstructionSet::ARM::Mode::User) {
return nullptr;
}
if(!is_read && !os_mode_) {
return nullptr;
}
break;
}
return reinterpret_cast<IntT *>(mapping_[page].target + address);
}
@ -448,6 +464,10 @@ class ConcreteMachine:
// TODO: pipeline prefetch?
logger.info().append("%08x: %08x", executor_.pc(), instruction);
if(executor_.pc() == 0x03812148) {
printf("");
}
InstructionSet::ARM::execute<arm_model>(instruction, executor_);
}
}