pub struct TaskStateSegmentHeader {Show 23 fields
pub previous_task: u16,
pub privileged_stack: [PrivilegedStack; 3],
pub control_register_3: u32,
pub instruction_pointer: u32,
pub flags: u32,
pub general_a: u32,
pub general_c: u32,
pub general_d: u32,
pub general_b: u32,
pub stack_pointer: u32,
pub base_pointer: u32,
pub source_index: u32,
pub destination_index: u32,
pub general_segment_e: Selector,
pub code_segment: Selector,
pub stack_segment: Selector,
pub data_segment: Selector,
pub general_segment_f: Selector,
pub general_segment_g: Selector,
pub local_descriptor_table: Selector,
pub debug_trap: bool,
pub io_permission_map_offset: u16,
pub shadow_stack_pointer: u32,
/* private fields */
}Expand description
Saved task state that makes up the most significant part of a task state segment (TSS).
Some of the fields of this header are automatically saved by the processor when switching tasks. Refer to each field’s documentation.
This header can be followed by OS-specific data and/or the
TaskStateSegmentBitmaps. The location of the latter is determined by
io_permission_map_offset.
Fields§
§previous_task: u16Segment selector saved by the processor referencing the task that was running before this task was activated.
If FlagRegister::nested_task is set, then this task will be resumed by the
IRET instruction.
privileged_stack: [PrivilegedStack; 3]Stack pointer and segment for privilege levels 0–2.
Not modified by the processor on a task switch.
control_register_3: u32Page table pointer from ControlRegister3.
Not modified by the processor on a task switch.
instruction_pointer: u32EIP value saved by the processor.
flags: u32EFLAGS value saved by the processor.
general_a: u32EAX value saved by the processor.
general_c: u32ECX value saved by the processor.
general_d: u32EDX value saved by the processor.
general_b: u32EBX value saved by the processor.
stack_pointer: u32SP value saved by the processor for privilege level 3.
base_pointer: u32EBP value saved by the processor.
source_index: u32ESI value saved by the processor.
destination_index: u32EDI value saved by the processor.
general_segment_e: SelectorES value saved by the processor.
code_segment: SelectorCS value saved by the processor.
stack_segment: SelectorSS value saved by the processor for privilege level 3.
data_segment: SelectorDS value saved by the processor.
general_segment_f: SelectorFS value saved by the processor.
general_segment_g: SelectorGS value saved by the processor.
local_descriptor_table: SelectorLocalDescriptorTableRegister value to load when executing this task.
Not modified by the processor on a task switch.
debug_trap: boolIndicates that a debug exception should be raised when this task is activated.
Not modified by the processor on a task switch.
io_permission_map_offset: u16Offset from the start of this structure to start of the IOPermissionBitmap,
and to the end of the interrupt_redirect
bitmap.
The I/O permission map ends at the limit of the containing segment, and must be at least two bytes. If this offset is equal to or greater than the limit, then the permission map is empty and all ports are assumed to be zero.
The interrupt redirect bitmap begins at this offset minus 32.
Not modified by the processor on a task switch.
shadow_stack_pointer: u32Pointer to the shadow stack.
Not modified by the processor on a task switch.
Implementations§
Trait Implementations§
Source§impl Clone for TaskStateSegmentHeader
impl Clone for TaskStateSegmentHeader
Source§fn clone(&self) -> TaskStateSegmentHeader
fn clone(&self) -> TaskStateSegmentHeader
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read more