bshell/bshell.runtime/runtime/opcode.c

#include <bshell/runtime/opcode.h>
#include <fx/int.h>

#define BSHELL_OPCODE_MAX 0xFF
#define ARG_MAX           0xFFFFFF

bshell_instruction bshell_instruction_encode(
	enum bshell_opcode opcode,
	uint32_t arg)
{
	if (opcode > BSHELL_OPCODE_MAX) {
		return BSHELL_INSTRUCTION_INVALID;
	}

	return fx_u32_htob((opcode & BSHELL_OPCODE_MAX) | (arg & ARG_MAX) << 8);
}

void bshell_instruction_decode(
	bshell_instruction instr,
	enum bshell_opcode *out_opcode,
	uint32_t *out_arg)
{
	instr = fx_u32_btoh(instr);
	*out_opcode = (instr & BSHELL_OPCODE_MAX);
	*out_arg = ((instr >> 8) & ARG_MAX);
}