172 lines
6.9 KiB
C
172 lines
6.9 KiB
C
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#ifndef _I386_ACONST_H
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#define _I386_ACONST_H 1
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#include <machine/interrupt.h>
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#include <machine/memory.h>
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/* 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 256 /* the table is set to it's maximal size */
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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_FIRST 8 /* first kernel TSS */
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#define TSS_INDEX_BOOT TSS_INDEX_FIRST
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#define TSS_INDEX(cpu) (TSS_INDEX_FIRST + (cpu)) /* per cpu kernel tss */
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#define FIRST_LDT_INDEX TSS_INDEX(CONFIG_MAX_CPUS) /* rest of descriptors are LDT's */
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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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/*
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* WARNING no () around the macros, be careful. This is because of ACK assembler
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* and will be fixed after switching to GAS
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*/
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#define GDT_SELECTOR GDT_INDEX * DESC_SIZE
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#define IDT_SELECTOR IDT_INDEX * DESC_SIZE
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#define DS_SELECTOR DS_INDEX * DESC_SIZE
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#define ES_SELECTOR ES_INDEX * DESC_SIZE
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/* flat DS is less privileged ES */
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#define FLAT_DS_SELECTOR ES_SELECTOR
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#define SS_SELECTOR SS_INDEX * DESC_SIZE
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#define CS_SELECTOR CS_INDEX * DESC_SIZE
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#define MON_CS_SELECTOR MON_CS_INDEX * DESC_SIZE
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#define TSS_SELECTOR(cpu) (TSS_INDEX(cpu) * DESC_SIZE)
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#define TSS_SELECTOR_BOOT (TSS_INDEX_BOOT * DESC_SIZE)
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/* Privileges. */
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#define INTR_PRIVILEGE 0 /* kernel and interrupt handlers */
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#define USER_PRIVILEGE 3 /* servers and user processes */
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#define RPL_MASK 0x03 /* bits in selector RPL */
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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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/* 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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#define INT_GATE_TYPE (INT_286_GATE | DESC_386_BIT)
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#define TSS_TYPE (AVL_286_TSS | DESC_386_BIT)
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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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#define ALIGNMENT_CHECK_VECTOR 17
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#define MACHINE_CHECK_VECTOR 18
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#define SIMD_EXCEPTION_VECTOR 19 /* SIMD Floating-Point Exception (#XM) */
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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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/* 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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/* 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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/* 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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/* Program stack words and masks. */
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#define INIT_PSW 0x0200 /* initial psw */
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#define INIT_TASK_PSW 0x1200 /* initial psw for tasks (with IOPL 1) */
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#define TRACEBIT 0x0100 /* OR this with psw in proc[] for tracing */
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#define SETPSW(rp, new) /* permits only certain bits to be set */ \
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((rp)->p_reg.psw = ((rp)->p_reg.psw & ~0xCD5) | ((new) & 0xCD5))
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#define IF_MASK 0x00000200
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#define IOPL_MASK 0x003000
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#define vir2phys(vir) ((phys_bytes)((kinfo.data_base + (vir_bytes) (vir))))
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#define phys2vir(ph) ((vir_bytes)((vir_bytes) (ph) - kinfo.data_base))
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#define INTEL_CPUID_GEN_EBX 0x756e6547 /* ASCII value of "Genu" */
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#define INTEL_CPUID_GEN_EDX 0x49656e69 /* ASCII value of "ineI" */
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#define INTEL_CPUID_GEN_ECX 0x6c65746e /* ASCII value of "ntel" */
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#define AMD_CPUID_GEN_EBX 0x68747541 /* ASCII value of "Auth" */
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#define AMD_CPUID_GEN_EDX 0x69746e65 /* ASCII value of "enti" */
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#define AMD_CPUID_GEN_ECX 0x444d4163 /* ASCII value of "cAMD" */
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#define CPU_VENDOR_INTEL 0
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#define CPU_VENDOR_AMD 2
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#define CPU_VENDOR_UNKNOWN 0xff
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/* fpu context should be saved in 16-byte aligned memory */
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#define FPUALIGN 16
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/* Poweroff 16-bit code address */
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#define BIOS_POWEROFF_ENTRY 0x1000
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/*
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* defines how many bytes are reserved at the top of the kernel stack for global
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* information like currently scheduled process or current cpu id
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*/
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#define X86_STACK_TOP_RESERVED (2 * sizeof(reg_t))
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#endif /* _I386_ACONST_H */
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