Struct PSR

pub struct PSR(/* private fields */);

A wrapper over u16 in order to faciliate the PSR.

The word is encoded as the following:

• PSR[15..16]: Privilege mode (0 = supervisor, 1 = user)
• PSR[8..11]: Interrupt priority
• PSR[0..3]: Condition codes

        privilege
        |     interrupt priority
        |     |         condition codes
        |     |         |
        V     V         V
0x8002: 1000 0000 0000 0010
        ~     ~~~       ~~~

Each of these are exposed as the PSR::privileged, PSR::priority, and PSR::cc values.

Implementations

impl PSR

pub fn new() -> Self

Creates a PSR with a default value (user mode, z condition code).

pub fn privileged(&self) -> bool

Checks whether the simulator is in privileged mode.

• true = supervisor mode
• false = user mode

pub fn priority(&self) -> u8

Checks the current interrupt priority of the simulator.

pub fn cc(&self) -> u8

Checks the condition code of the simulator.

pub fn is_n(&self) -> bool

Checks the condition code of the simulator is n.

pub fn is_z(&self) -> bool

Checks the condition code of the simulator is z.

pub fn is_p(&self) -> bool

Checks the condition code of the simulator is p.

pub fn get(&self) -> u16

Gets the bit-representation of the PSR.

pub fn set(&mut self, data: u16)

Sets the PSR to the provided data value.

pub fn set_privileged(&mut self, privl: bool)

Sets whether the simulator is in privileged mode.

pub fn set_priority(&mut self, prio: u8)

Sets the current interrupt priority of the simulator.

pub fn set_cc(&mut self, cc: u8)

Sets the condition code of the simulator.

pub fn set_cc_n(&mut self)

Sets the condition code of the simulator to n.

pub fn set_cc_z(&mut self)

Sets the condition code of the simulator to z.

pub fn set_cc_p(&mut self)

Sets the condition code of the simulator to p.

Trait Implementations

impl Debug for PSR

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for PSR

fn default() -> Self

Returns the “default value” for a type.