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/* Project: OSLib
* Description: The OS Construction Kit
* Date: 1.6.2000
* Idea by: Luca Abeni & Gerardo Lamastra
*
* OSLib is an SO project aimed at developing a common, easy-to-use
* low-level infrastructure for developing OS kernels and Embedded
* Applications; it partially derives from the HARTIK project but it
* currently is independently developed.
*
* OSLib is distributed under GPL License, and some of its code has
* been derived from the Linux kernel source; also some important
* ideas come from studying the DJGPP go32 extender.
*
* We acknowledge the Linux Community, Free Software Foundation,
* D.J. Delorie and all the other developers who believe in the
* freedom of software and ideas.
*
* For legalese, check out the included GPL license.
*/
/* As the name says... All the hardware-dependent data structures... */
#ifndef __LL_I386_HW_DATA_H__
#define __LL_I386_HW_DATA_H__
#include <ll/i386/defs.h>
BEGIN_DEF
/* DO WE NEED A SEPARATE INCL FILE FOR THIS? */
#if defined(__GNU__)
#define __LL_ARCH__ "32/DJGPP C/COFF"
#elif defined(__LINUX__)
#define __LL_ARCH__ "32/LINUX CrossCompiled/ELF"
#else
#error Architecture Undefined!
#endif
#include <ll/i386/sel.h>
/* Useful basic types */
#ifndef __BASIC_DATA__
#define __BASIC_DATA__
typedef void *LIN_ADDR;
typedef unsigned long DWORD;
typedef unsigned short WORD;
typedef unsigned char BYTE;
typedef unsigned long TIME;
typedef unsigned long SYS_FLAGS;
#define TRUE 1
#define FALSE 0
#define MAX_DWORD 0xFFFFFFFF
#define MAX_WORD 0xFFFF
#define MAX_BYTE 0xFF
#define MAX_TIME MAX_DWORD
#endif
typedef short CONTEXT;
/* Hardware based types (Self explanatory) */
typedef struct gate {
WORD offset_lo __attribute__ ((packed));
WORD sel __attribute__ ((packed));
BYTE dword_cnt __attribute__ ((packed));
BYTE access __attribute__ ((packed));
WORD offset_hi __attribute__ ((packed));
} GATE;
typedef struct descriptor {
WORD lim_lo __attribute__ ((packed));
WORD base_lo __attribute__ ((packed));
BYTE base_med __attribute__ ((packed));
BYTE access __attribute__ ((packed));
BYTE gran __attribute__ ((packed));
BYTE base_hi __attribute__ ((packed));
} DESCRIPTOR;
/* A LDT/GDT entry could be a gate or a selector */
/* An IDT entry could be a gate only */
union gdt_entry {
DESCRIPTOR d __attribute__ ((packed));
GATE g __attribute__ ((packed));
};
#define STACK_ACCESS 0x92 /* Basic Access bytes */
#define DATA_ACCESS 0x92
#define CODE_ACCESS 0x9A
/* At this level we just need to set up 2 gates to enter/exit PM */
/* The entry gate is a 386 32 bit call gate */
/* The exit (Back To Real Mode) gate is a 286 16 bit gate */
#define CALL_GATE286 0x84 /* Call & Int Gate Access bytes */
#define CALL_GATE386 0x8C
#define TASK_GATE 0x85
#define INT_GATE286 0x86
#define INT_GATE386 0x8E
#define TRAP_GATE286 0x87
#define TRAP_GATE386 0x8F
/* TSS selectors */
#define FREE_TSS386 0x89
#define BUSY_TSS386 0x8B
#define FREE_TSS286 0x81
#define BUSY_TSS286 0x83
#define GRAN_32B 0xC0 /* Granularity settings */
#define GRAN_32 0x40
#define GRAN_16 0x00
/* This is the TSS image for a 386 hardware task */
/* I added two other fields to the basic structure: */
/* 1) The CONTROL field which is used by system software to detect */
/* particular conditions; in this the first phase it is mainly used */
/* to mark the unused TSS & TSS which use math, altough thanks to */
/* the automatic FPU preemption supported in 386 this would be not */
/* necessary. */
/* 2) The ctx_FPU field used to store the FPU context if necessaary */
#define TSS_USED 0x8000
#define FPU_USED 0x4000
#define FPU_CONTEXT_SIZE 108
/* CPU flags definitions */
#define CPU_FLAG_TF 0x00000100
#define CPU_FLAG_IF 0x00000200
#define CPU_FLAG_IOPL 0x00003000
#define CPU_FLAG_NT 0x00004000
#define CPU_FLAG_VM 0x00020000
#define CPU_FLAG_AC 0x00040000
#define CPU_FLAG_VIF 0x00080000
#define CPU_FLAG_VIP 0x00100000
#define CPU_FLAG_ID 0x00200000
typedef struct tss {
WORD back_link __attribute__ ((packed));
WORD _fill0 __attribute__ ((packed));
DWORD esp0 __attribute__ ((packed));
WORD ss0 __attribute__ ((packed));
WORD _fill1 __attribute__ ((packed));
DWORD esp1 __attribute__ ((packed));
WORD ss1 __attribute__ ((packed));
WORD _fill2 __attribute__ ((packed));
DWORD esp2 __attribute__ ((packed));
WORD ss2 __attribute__ ((packed));
WORD _fill3 __attribute__ ((packed));
DWORD cr3 __attribute__ ((packed));
DWORD eip __attribute__ ((packed));
DWORD eflags __attribute__ ((packed));
DWORD eax __attribute__ ((packed));
DWORD ecx __attribute__ ((packed));
DWORD edx __attribute__ ((packed));
DWORD ebx __attribute__ ((packed));
DWORD esp __attribute__ ((packed));
DWORD ebp __attribute__ ((packed));
DWORD esi __attribute__ ((packed));
DWORD edi __attribute__ ((packed));
WORD es __attribute__ ((packed));
WORD _fill5 __attribute__ ((packed));
WORD cs __attribute__ ((packed));
WORD _fill6 __attribute__ ((packed));
WORD ss __attribute__ ((packed));
WORD _fill7 __attribute__ ((packed));
WORD ds __attribute__ ((packed));
WORD _fill8 __attribute__ ((packed));
WORD fs __attribute__ ((packed));
WORD _fill9 __attribute__ ((packed));
WORD gs __attribute__ ((packed));
WORD _fill10 __attribute__ ((packed));
WORD ldt __attribute__ ((packed));
WORD _fill11 __attribute__ ((packed));
WORD trap __attribute__ ((packed));
WORD io_base __attribute__ ((packed));
DWORD control __attribute__ ((packed));
BYTE ctx_FPU[FPU_CONTEXT_SIZE] __attribute__ ((packed));
} TSS;
/* Irq services specifications */
#define TIMER_IRQ 0
#define KEYB_IRQ 1
#define COM2_IRQ 3
#define COM1_IRQ 4
#define COM4_IRQ 3
#define COM3_IRQ 4
#define SB_IRQ 5
#define FDC_IRQ 6
#define SB2_IRQ 7
#define RTC_IRQ 8
#define PS2MOUSE_IRQ 12
#define COPROC_IRQ 13
#define IDE0_IRQ 14
#define IDE1_IRQ 15
typedef void (*INTERRUPT)(void);
/* Any Kernel primitive is declared with the SYSCALL() modifier */
/* This is useful to add special purposes meaning to the function */
/* defclaration */
#define SYSCALL(x) x
END_DEF
#endif