/* Constants for protected mode. */ /* Table sizes. */ #define GDT_SIZE (FIRST_LDT_INDEX + NR_TASKS + NR_PROCS) /* spec. and LDT's */ #define IDT_SIZE (IRQ8_VECTOR + 8) /* only up to the highest vector */ #define LDT_SIZE 2 /* contains CS and DS only */ /* Fixed global descriptors. 1 to 7 are prescribed by the BIOS. */ #define BIOS_GDT_INDEX 1 /* temp spot to store pointer to GDT */ #define BIOS_IDT_INDEX 2 /* temp spot to store pointer to GDT */ #define DS_INDEX 3 /* kernel DS */ #define ES_INDEX 4 /* kernel ES */ #define SS_INDEX 5 /* kernel SS */ #define CS_INDEX 6 /* kernel CS */ #define BIOS_CS_INDEX 7 /* temp for BIOS */ #define TSS_INDEX 8 /* kernel TSS */ #define DS_286_INDEX 9 /* scratch 16-bit source segment */ #define ES_286_INDEX 10 /* scratch 16-bit destination segment */ #define FLAT_DS_INDEX 11 /* 32-bit segment seg covering all of memory */ #define COLOR_INDEX 12 /* color screen segment */ #define MONO_INDEX 13 /* mono screen segment */ #define DB_CS_INDEX 14 /* debugger CS */ #define DB_CS16_INDEX 15 /* debugger 16-bit CS for 386 */ #define DB_DS_INDEX 16 /* debugger DS */ #define GDT_INDEX 17 /* GDT DS for debugger */ #define FIRST_LDT_INDEX 18 /* rest of descriptors are LDT's */ #if AM_KERNEL #if !NONET #undef FIRST_LDT_INDEX #define EPLUS_INDEX 18 /* Western Digital Etherplus buffer */ #define FIRST_LDT_INDEX 19 /* rest of descriptors are LDT's */ #endif /* NONET */ #endif /* AM_KERNEL */ #define BIOS_GDT_SELECTOR 0x08 /* (BIOS_GDT_INDEX * DESC_SIZE) bad for asld */ #define BIOS_IDT_SELECTOR 0x10 /* (BIOS_IDT_INDEX * DESC_SIZE) */ #define DS_SELECTOR 0x18 /* (DS_INDEX * DESC_SIZE) */ #define CS_SELECTOR 0x30 /* (CS_INDEX * DESC_SIZE) */ #define BIOS_CS_SELECTOR 0x38 /* (BIOS_CS_INDEX * DESC_SIZE) */ #define TSS_SELECTOR 0x40 /* (TSS_INDEX * DESC_SIZE) */ #define DS_286_SELECTOR 0x49 /* (DS_286_INDEX * DESC_SIZE + 1) */ #define ES_286_SELECTOR 0x51 /* (ES_286_INDEX * DESC_SIZE + 1) */ #define FLAT_DS_SELECTOR 0x59 /* (FLAT_DS_INDEX * DESC_SIZE + 1) */ #define COLOR_SELECTOR 0x61 /* (COLOR_INDEX * DESC_SIZE + 1) */ #define MONO_SELECTOR 0x69 /* (MONO_INDEX * DESC_SIZE + 1) */ #define DB_CS_SELECTOR 0x70 /* (DB_CS_INDEX * DESC_SIZE) */ #define DB_CS16_SELECTOR 0x78 /* (DB_CS16_INDEX * DESC_SIZE) */ #define DB_DS_SELECTOR 0x80 /* (DB_DS_INDEX * DESC_SIZE) */ #define GDT_SELECTOR 0x88 /* (GDT_INDEX * DESC_SIZE) */ #if AM_KERNEL #if !NONET #define EPLUS_SELECTOR 0x91 /* (EPLUS_INDEX * DESC_SIZE) */ #endif /* AM_KERNEL */ #endif /* NONET */ /* Fixed local descriptors. */ #define CS_LDT_INDEX 0 /* process CS */ #define DS_LDT_INDEX 1 /* process DS=ES=FS=GS=SS */ /* Privileges. */ #define INTR_PRIVILEGE 0 /* kernel and interrupt handlers */ #define TASK_PRIVILEGE 1 #define USER_PRIVILEGE 3 /* 286 hardware constants. */ /* Exception vector numbers. */ #define BOUNDS_VECTOR 5 /* bounds check failed */ #define INVAL_OP_VECTOR 6 /* invalid opcode */ #define COPROC_NOT_VECTOR 7 /* coprocessor not available */ #define DOUBLE_FAULT_VECTOR 8 #define COPROC_SEG_VECTOR 9 /* coprocessor segment overrun */ #define INVAL_TSS_VECTOR 10 /* invalid TSS */ #define SEG_NOT_VECTOR 11 /* segment not present */ #define STACK_FAULT_VECTOR 12 /* stack exception */ #define PROTECTION_VECTOR 13 /* general protection */ /* Selector bits. */ #define TI 0x04 /* table indicator */ #define RPL 0x03 /* requester privilege level */ /* Descriptor structure offsets. */ #define DESC_BASE 2 /* to base_low */ #define DESC_BASE_MIDDLE 4 /* to base_middle */ #define DESC_ACCESS 5 /* to access byte */ #define DESC_SIZE 8 /* sizeof (struct segdesc_s) */ /* Segment sizes. */ #define MAX_286_SEG_SIZE 0x10000L /* Base and limit sizes and shifts. */ #define BASE_MIDDLE_SHIFT 16 /* shift for base --> base_middle */ /* Access-byte and type-byte bits. */ #define PRESENT 0x80 /* set for descriptor present */ #define DPL 0x60 /* descriptor privilege level mask */ #define DPL_SHIFT 5 #define SEGMENT 0x10 /* set for segment-type descriptors */ /* Access-byte bits. */ #define EXECUTABLE 0x08 /* set for executable segment */ #define CONFORMING 0x04 /* set for conforming segment if executable */ #define EXPAND_DOWN 0x04 /* set for expand-down segment if !executable*/ #define READABLE 0x02 /* set for readable segment if executable */ #define WRITEABLE 0x02 /* set for writeable segment if !executable */ #define TSS_BUSY 0x02 /* set if TSS descriptor is busy */ #define ACCESSED 0x01 /* set if segment accessed */ /* Special descriptor types. */ #define AVL_286_TSS 1 /* available 286 TSS */ #define LDT 2 /* local descriptor table */ #define BUSY_286_TSS 3 /* set transparently to the software */ #define CALL_286_GATE 4 /* not used */ #define TASK_GATE 5 /* only used by debugger */ #define INT_286_GATE 6 /* interrupt gate, used for all vectors */ #define TRAP_286_GATE 7 /* not used */ /* Extra 386 hardware constants. */ /* Exception vector numbers. */ #define PAGE_FAULT_VECTOR 14 #define COPROC_ERR_VECTOR 16 /* coprocessor error */ /* Descriptor structure offsets. */ #define DESC_GRANULARITY 6 /* to granularity byte */ #define DESC_BASE_HIGH 7 /* to base_high */ /* Base and limit sizes and shifts. */ #define BASE_HIGH_SHIFT 24 /* shift for base --> base_high */ #define BYTE_GRAN_MAX 0xFFFFFL /* maximum size for byte granular segment */ #define GRANULARITY_SHIFT 16 /* shift for limit --> granularity */ #define OFFSET_HIGH_SHIFT 16 /* shift for (gate) offset --> offset_high */ #define PAGE_GRAN_SHIFT 12 /* extra shift for page granular limits */ /* Type-byte bits. */ #define DESC_386_BIT 0x08 /* 386 types are obtained by ORing with this */ /* LDT's and TASK_GATE's don't need it */ /* Granularity byte. */ #define GRANULAR 0x80 /* set for 4K granularilty */ #define DEFAULT 0x40 /* set for 32-bit defaults (executable seg) */ #define BIG 0x40 /* set for "BIG" (expand-down seg) */ #define AVL 0x10 /* 0 for available */ #define LIMIT_HIGH 0x0F /* mask for high bits of limit */