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 */
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 */
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ipl_t interrupts_disable(void)
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ipl_t interrupts_disable(void)
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{
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{
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    ipl_t ipl = current_status_reg_read();
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    ipl_t ipl = current_status_reg_read();
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    current_status_reg_control_write(ipl & ~STATUS_REG_IE_ENABLED_BIT);
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    current_status_reg_control_write(STATUS_REG_IRQ_DISABLED_BIT | ipl);
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    return ipl;
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    return ipl;
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}
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}
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/** Enable interrupts.
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/** Enable interrupts.
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 */
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 */
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ipl_t interrupts_enable(void)
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ipl_t interrupts_enable(void)
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{
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{
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    ipl_t ipl = current_status_reg_read();
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    ipl_t ipl = current_status_reg_read();
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    current_status_reg_control_write(ipl | STATUS_REG_IE_ENABLED_BIT);
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    current_status_reg_control_write(ipl & ~STATUS_REG_IRQ_DISABLED_BIT);
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    return ipl;
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    return ipl;
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}
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}
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/** Restore interrupt priority level.
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/** Restore interrupt priority level.
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 * @param ipl Saved interrupt priority level.
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 * @param ipl Saved interrupt priority level.
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 */
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 */
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void interrupts_restore(ipl_t ipl)
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void interrupts_restore(ipl_t ipl)
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{
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{
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    current_status_reg_control_write(current_status_reg_read() |
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    current_status_reg_control_write(current_status_reg_read() |
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            (ipl & STATUS_REG_IE_ENABLED_BIT));
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            (ipl & STATUS_REG_IRQ_DISABLED_BIT));
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}
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}
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/** Read interrupt priority level.
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/** Read interrupt priority level.
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 *
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 *
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 * @return Current interrupt priority level.
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 * @return Current interrupt priority level.