simple SoC

SoC architecture overview

Read HellyRISC architecture overview

Booting process

1. Bootloader load to RAM basic input/output system, which provide some interrupts and containts programs to display strings, run programs and other.
2. Bootloader copy to memory code from SD-card
3. CPU-enabled flag it turn-on and calling RESET interrupt.

Multi CPU and threads

Available 4 CPU with 4 threads per CPU.

Any CPU starts from @00_00 + 4 * CPU_ID. For example:

x0000: h0F00; // reset (initial) address
...
x0F00: jmp CPU_1_main; // start instruction for CPU_1
x0F04: jmp CPU_2_main; // start instruction for CPU_2
x0F08: jmp h0F08; // instruction for CPU_3 (awaiting for command)
x0F0A: jmp h0F0A; // instruction for CPU_4 (awaiting for command)

CPU 2, 3, 4 is disabled by default;

Commands

; CPU's:
 OR  $cpu, b0010 ;  set $cpu[2] to 1 to enable CPU_2;
 AND $cpu, b1101 ;  set $cpu[2] to 0 to disable CPU_2;
; THREADS:
 THR_CH   TH_ID ;  change current thread to TH_ID. Will changes registes and stack pointer bank.
 THR_RST  TH_ID, START_ADDR ; reset TH_ID thread and set PC to START_ADDR and start thread
 THR_SYCN uniq_id ; 

Examples

Hello world

#include stdio.asm

.DATA
_STR "Wake up, Neo\b_";

.PROGRAM
push addr(_STR);
call print;