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interface.go
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interface.go
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// This file is part of Gopher2600.
//
// Gopher2600 is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Gopher2600 is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Gopher2600. If not, see <https://www.gnu.org/licenses/>.
package arm
// SharedMemory represents the memory passed between the parent
// cartridge-mapper implementation and the ARM.
type SharedMemory interface {
// Return memory block and array offset for the requested address. Memory
// blocks mays be different for read and write operations.
//
// Note that there is no indication of how the memory will be access. For
// instance whether it's for a 32bit or an 8bit access. For this reason the
// implemention can assume that the access is 8bit and that the user of the
// result will make further boundary checks as appropriate.
MapAddress(addr uint32, write bool) (*[]byte, uint32)
// Return reset addreses for the Stack Pointer register; the Link Register;
// and Program Counter
ResetVectors() (uint32, uint32, uint32)
// Return true is address contains executable instructions.
IsExecutable(addr uint32) bool
}
// CartridgeHook allows the parent cartridge mapping to emulate ARM code in a
// more direct way. This is primarily because we do not yet emulate full ARM
// bytecode only Thumb bytecode, and the value of doing so is unclear.
type CartridgeHook interface {
// Returns false if parent cartridge mapping does not understand the
// address.
ARMinterrupt(addr uint32, val1 uint32, val2 uint32) (ARMinterruptReturn, error)
}
// ARMInterruptReturn is the return value of the ARMinterrupt type.
type ARMinterruptReturn struct {
InterruptEvent string
SaveResult bool
SaveRegister uint32
SaveValue uint32
InterruptServiced bool
NumMemAccess int
NumAdditionalCycles int
}