125 lines
5.7 KiB
C
Executable File
125 lines
5.7 KiB
C
Executable File
/* Constants for protected mode. */
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/* Table sizes. */
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#define GDT_SIZE (FIRST_LDT_INDEX + NR_TASKS + NR_PROCS)
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/* spec. and LDT's */
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#define IDT_SIZE (IRQ8_VECTOR + 8) /* only up to the highest vector */
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#define LDT_SIZE (2 + NR_REMOTE_SEGS) /* CS, DS and remote segments */
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/* Fixed global descriptors. 1 to 7 are prescribed by the BIOS. */
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#define GDT_INDEX 1 /* GDT descriptor */
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#define IDT_INDEX 2 /* IDT descriptor */
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#define DS_INDEX 3 /* kernel DS */
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#define ES_INDEX 4 /* kernel ES (386: flag 4 Gb at startup) */
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#define SS_INDEX 5 /* kernel SS (386: monitor SS at startup) */
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#define CS_INDEX 6 /* kernel CS */
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#define MON_CS_INDEX 7 /* temp for BIOS (386: monitor CS at startup) */
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#define TSS_INDEX 8 /* kernel TSS */
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#define DS_286_INDEX 9 /* scratch 16-bit source segment */
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#define ES_286_INDEX 10 /* scratch 16-bit destination segment */
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#define A_INDEX 11 /* 64K memory segment at A0000 */
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#define B_INDEX 12 /* 64K memory segment at B0000 */
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#define C_INDEX 13 /* 64K memory segment at C0000 */
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#define D_INDEX 14 /* 64K memory segment at D0000 */
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#define FIRST_LDT_INDEX 15 /* rest of descriptors are LDT's */
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#define GDT_SELECTOR 0x08 /* (GDT_INDEX * DESC_SIZE) bad for asld */
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#define IDT_SELECTOR 0x10 /* (IDT_INDEX * DESC_SIZE) */
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#define DS_SELECTOR 0x18 /* (DS_INDEX * DESC_SIZE) */
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#define ES_SELECTOR 0x20 /* (ES_INDEX * DESC_SIZE) */
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#define FLAT_DS_SELECTOR 0x21 /* less privileged ES */
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#define SS_SELECTOR 0x28 /* (SS_INDEX * DESC_SIZE) */
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#define CS_SELECTOR 0x30 /* (CS_INDEX * DESC_SIZE) */
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#define MON_CS_SELECTOR 0x38 /* (MON_CS_INDEX * DESC_SIZE) */
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#define TSS_SELECTOR 0x40 /* (TSS_INDEX * DESC_SIZE) */
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#define DS_286_SELECTOR 0x49 /* (DS_286_INDEX*DESC_SIZE+TASK_PRIVILEGE) */
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#define ES_286_SELECTOR 0x51 /* (ES_286_INDEX*DESC_SIZE+TASK_PRIVILEGE) */
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/* Fixed local descriptors. */
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#define CS_LDT_INDEX 0 /* process CS */
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#define DS_LDT_INDEX 1 /* process DS=ES=FS=GS=SS */
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#define EXTRA_LDT_INDEX 2 /* first of the extra LDT entries */
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/* Privileges. */
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#define INTR_PRIVILEGE 0 /* kernel and interrupt handlers */
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#define TASK_PRIVILEGE 1 /* kernel tasks */
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#define USER_PRIVILEGE 3 /* servers and user processes */
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/* 286 hardware constants. */
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/* Exception vector numbers. */
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#define BOUNDS_VECTOR 5 /* bounds check failed */
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#define INVAL_OP_VECTOR 6 /* invalid opcode */
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#define COPROC_NOT_VECTOR 7 /* coprocessor not available */
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#define DOUBLE_FAULT_VECTOR 8
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#define COPROC_SEG_VECTOR 9 /* coprocessor segment overrun */
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#define INVAL_TSS_VECTOR 10 /* invalid TSS */
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#define SEG_NOT_VECTOR 11 /* segment not present */
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#define STACK_FAULT_VECTOR 12 /* stack exception */
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#define PROTECTION_VECTOR 13 /* general protection */
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/* Selector bits. */
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#define TI 0x04 /* table indicator */
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#define RPL 0x03 /* requester privilege level */
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/* Descriptor structure offsets. */
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#define DESC_BASE 2 /* to base_low */
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#define DESC_BASE_MIDDLE 4 /* to base_middle */
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#define DESC_ACCESS 5 /* to access byte */
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#define DESC_SIZE 8 /* sizeof (struct segdesc_s) */
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/* Base and limit sizes and shifts. */
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#define BASE_MIDDLE_SHIFT 16 /* shift for base --> base_middle */
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/* Access-byte and type-byte bits. */
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#define PRESENT 0x80 /* set for descriptor present */
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#define DPL 0x60 /* descriptor privilege level mask */
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#define DPL_SHIFT 5
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#define SEGMENT 0x10 /* set for segment-type descriptors */
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/* Access-byte bits. */
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#define EXECUTABLE 0x08 /* set for executable segment */
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#define CONFORMING 0x04 /* set for conforming segment if executable */
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#define EXPAND_DOWN 0x04 /* set for expand-down segment if !executable*/
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#define READABLE 0x02 /* set for readable segment if executable */
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#define WRITEABLE 0x02 /* set for writeable segment if !executable */
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#define TSS_BUSY 0x02 /* set if TSS descriptor is busy */
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#define ACCESSED 0x01 /* set if segment accessed */
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/* Special descriptor types. */
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#define AVL_286_TSS 1 /* available 286 TSS */
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#define LDT 2 /* local descriptor table */
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#define BUSY_286_TSS 3 /* set transparently to the software */
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#define CALL_286_GATE 4 /* not used */
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#define TASK_GATE 5 /* only used by debugger */
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#define INT_286_GATE 6 /* interrupt gate, used for all vectors */
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#define TRAP_286_GATE 7 /* not used */
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/* Extra 386 hardware constants. */
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/* Exception vector numbers. */
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#define PAGE_FAULT_VECTOR 14
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#define COPROC_ERR_VECTOR 16 /* coprocessor error */
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/* Descriptor structure offsets. */
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#define DESC_GRANULARITY 6 /* to granularity byte */
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#define DESC_BASE_HIGH 7 /* to base_high */
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/* Base and limit sizes and shifts. */
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#define BASE_HIGH_SHIFT 24 /* shift for base --> base_high */
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#define BYTE_GRAN_MAX 0xFFFFFL /* maximum size for byte granular segment */
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#define GRANULARITY_SHIFT 16 /* shift for limit --> granularity */
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#define OFFSET_HIGH_SHIFT 16 /* shift for (gate) offset --> offset_high */
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#define PAGE_GRAN_SHIFT 12 /* extra shift for page granular limits */
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/* Type-byte bits. */
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#define DESC_386_BIT 0x08 /* 386 types are obtained by ORing with this */
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/* LDT's and TASK_GATE's don't need it */
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/* Granularity byte. */
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#define GRANULAR 0x80 /* set for 4K granularilty */
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#define DEFAULT 0x40 /* set for 32-bit defaults (executable seg) */
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#define BIG 0x40 /* set for "BIG" (expand-down seg) */
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#define AVL 0x10 /* 0 for available */
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#define LIMIT_HIGH 0x0F /* mask for high bits of limit */
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