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I Built a 64-bit VM with custom RISC architecture and compiler in Java
https://www.reddit.com/r/programming/comments/1mll7y7/i_built_a_64bit_vm_with_custom_risc_architecture/

I've developed Triton-64: a complete 64-bit virtual machine implementation in Java, created purely for educational purposes to deepen my understanding of compilers and computer architecture. This project evolved from my previous 32-bit CPU emulator (https://www.reddit.com/r/programming/comments/1lnohq1/i_built_a_cpu_emulator_with_its_own_assembler_in/) into a full system featuring: Custom 64-bit RISC architecture (32 registers, 32-bit fixed-width instructions) Advanced assembler with pseudo-instruction support (LDI64, PUSH, POP, JMP label, ...) TriC programming language and compiler (high-level → assembly) Memory-mapped I/O (keyboard input to memory etc...) Framebuffer (can be used for chars / pixels) Bootable ROM system TriC Language Example (Malloc and Free): global freeListHead = 0 func main() { var ptr1 = malloc(16) ; allocate 16 bytes if (ptr1 == 0) { return -1 } ; allocation failed @ptr1 = 0x123456789ABCDEF0 ; write a value to the allocated memory return @ptr1 ; return the value stored at ptr1 in a0 } func write64(addr, value) { @addr = value } func read64(addr) { return @addr } func malloc(size_req) { if (freeListHead == 0) { freeListHead = 402784256 ; constant from memory map write64(freeListHead, (134217728 << 32) | 0) ; pack size + next pointer } var current = freeListHead var prev = 0 var lowMask = (1 << 32) - 1 var highMask = ~lowMask while (current != 0) { var header = read64(current) var blockSize = header >> 32 var nextBlock = header & lowMask if (blockSize >= size_req + 8) { if (prev == 0) { freeListHead = nextBlock } else { var prevHeader = read64(prev) var sizePart = prevHeader & highMask write64(prev, sizePart | nextBlock) } return current + 8 } prev = current current = nextBlock } return 0 } func free(ptr) { var header = ptr - 8 var blockSize = read64(header) >> 32 write64(header, (blockSize << 32) | freeListHead) freeListHead = header } Demonstrations:
Framebuffer output (https://github.com/LPC4/Triton-64/blob/master/examples/test_charbuffer.gif) • Memory allocation (https://github.com/LPC4/Triton-64/blob/master/examples/test_malloc.gif) GitHub:
https://github.com/LPC4/Triton-64 Next Steps:
As a next step, I'm considering developing a minimal operating system for this architecture. Since I've never built an OS before, this will be probably be very difficult. Before diving into that, I'd be grateful for any feedback on the current project. Are there any architectural changes or features I should consider adding to make the VM more suitable for running an OS? Any suggestions or resources would be greatly appreciated. Thank you for reading!!  submitted by /u/ColdRepresentative91 (https://www.reddit.com/user/ColdRepresentative91)
[link] (https://github.com/LPC4/Triton-64) [comments] (https://www.reddit.com/r/programming/comments/1mll7y7/i_built_a_64bit_vm_with_custom_risc_architecture/)

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