Module x86::segmentation

Program x86 segmentation hardware.

Structs

SegmentDescriptor
SegmentSelector

Constants

DESC_AVL	Available for use by system software.
DESC_DB	Default operation size (0 = 16-bit segment, 1 = 32-bit segment)
DESC_DPL0	Descriptor privilege level 0.
DESC_DPL1	Descriptor privilege level 1.
DESC_DPL2	Descriptor privilege level 2.
DESC_DPL3	Descriptor privilege level 3.
DESC_G	Granularity.
DESC_L	64-bit code segment (IA-32e mode only).
DESC_P	Descriptor is Present.
DESC_S	Descriptor type (0 = system; 1 = code or data).
RPL_0	Requestor Privilege Level
RPL_1
RPL_2
RPL_3
TI_GDT	Table Indicator (TI) 0 means GDT is used.
TI_LDT	Table Indicator (TI) 1 means LDT is used.
TYPE_C_EO	Code Execute-Only
TYPE_C_EOA	Code Execute-Only, accessed
TYPE_C_EOC	Code Execute-Only, conforming
TYPE_C_EOCA	Code Execute-Only, conforming, accessed
TYPE_C_ER	Code Execute/Read
TYPE_C_ERA	Code Execute/Read, accessed
TYPE_C_ERC	Code Execute/Read, conforming
TYPE_C_ERCA	Code Execute/Read, conforming, accessed
TYPE_D_RO	Data Read-Only
TYPE_D_ROA	Data Read-Only, accessed
TYPE_D_ROEXD	Data Read-Only, expand-down
TYPE_D_ROEXDA	Data Read-Only, expand-down, accessed
TYPE_D_RW	Data Read/Write
TYPE_D_RWA	Data Read/Write, accessed
TYPE_D_RWEXD	Data Read/Write, expand-down
TYPE_D_RWEXDA	Data Read/Write, expand-down, accessed
TYPE_SYS_CALL_GATE
TYPE_SYS_INTERRUPT_GATE
TYPE_SYS_LDT
TYPE_SYS_TRAP_GATE
TYPE_SYS_TSS_AVAILABLE
TYPE_SYS_TSS_BUSY

Functions

load_cs	Reload code segment register. Note this is special since we can not directly move to %cs. Instead we push the new segment selector and return value on the stack and use lretq to reload cs and continue at 1:.
load_ds	Reload data segment register.
load_es	Reload fs segment register.
load_fs	Reload fs segment register.
load_gs	Reload gs segment register.
load_ss	Reload stack segment register.