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setup32.h
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setup32.h
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/*****************************************************************************/
/* File: setup32.h */
/* */
/* Description: Header file for x86 32 bit data structure for GDT, IDT, TSS */
/* and related macros. */
/* */
/* Author: Shoily O Rahman <shoily@gmail.com> */
/* */
/* Date: Mar 15, 2020 */
/* */
/*****************************************************************************/
#ifndef _SETUP_32_H
#define _SETUP_32_H
#define USER_CODE_SEG 0x10
#define USER_DATA_SEG 0x18
#define KERNEL_CODE_SEG 0x20
#define KERNEL_DATA_SEG 0x28
#define LDT_SELECTOR 0x30
#define FIRST_TASK_SEG 0x38
#define LAST_SEG (FIRST_TASK_SEG+(MAX_NUM_SMPS*8))
#define USER_CODE_SEG_IN_LDT 0x0
#define USER_DATA_SEG_IN_LDT 0x8
struct gdt_entry {
unsigned short segment_limit_low;
unsigned short base_address_low;
unsigned char base_address_mid;
unsigned int type:4;
unsigned int system:1;
unsigned int dpl:2;
unsigned int present:1;
unsigned char segment_limit_high:4;
unsigned int avl:1;
unsigned int l:1;
unsigned int db:1;
unsigned int granularity:1;
unsigned char base_address_high;
}__attribute__((packed));
struct idt_entry {
unsigned short offset_low;
unsigned short segment_selector;
unsigned char unused;
unsigned char type:4;
unsigned char s:1;
unsigned char dpl:2;
unsigned char present:1;
unsigned short offset_high;
}__attribute__((packed));
struct tss_entry {
unsigned short prev_task;
unsigned short reserved1;
unsigned int esp0;
unsigned short ss0;
unsigned short reserved2;
unsigned int esp1;
unsigned short ss1;
unsigned short reserved3;
unsigned int esp2;
unsigned short ss2;
unsigned short reserved4;
unsigned int cr3;
unsigned int eip;
unsigned int eflags;
unsigned int eax;
unsigned int ecx;
unsigned int edx;
unsigned int ebx;
unsigned int esp;
unsigned int ebp;
unsigned int esi;
unsigned int edi;
unsigned short es;
unsigned short reserved5;
unsigned short cs;
unsigned short reserved6;
unsigned short ss;
unsigned short reserved7;
unsigned short ds;
unsigned short reserved8;
unsigned short fs;
unsigned short reserved9;
unsigned short gs;
unsigned short reserved10;
unsigned short ldt;
unsigned short reserved11;
unsigned short reserved12;
unsigned short ioremapaddr;
}__attribute__((packed));
#define SET_GDT_ENTRY(g, index, segment_limit, base_address, _type, _system, _dpl, _db, _granularity) { \
struct gdt_entry *entry = g+index; \
memset(entry, 0, sizeof(struct gdt_entry)); \
entry->segment_limit_low = segment_limit & 0xffff; \
entry->segment_limit_high = (segment_limit >> 16) & 0xf; \
entry->base_address_low = base_address & 0xffff; \
entry->base_address_mid = (base_address >> 16) & 0xff; \
entry->base_address_high = (base_address >> 24) & 0xff; \
entry->type = _type; \
entry->system = _system; \
entry->dpl = _dpl; \
entry->present = 1; \
entry->avl = 0; \
entry->l = 0; \
entry->db = _db; \
entry->granularity = _granularity; \
}
#define SET_KERNEL_CODE_SEGMENT(g, segment_limit, base_address) SET_GDT_ENTRY(g, (KERNEL_CODE_SEG/8), segment_limit, base_address, 0xa, 1, 0, 1, 1)
#define SET_KERNEL_DATA_SEGMENT(g, segment_limit, base_address) SET_GDT_ENTRY(g, (KERNEL_DATA_SEG/8), segment_limit, base_address, 2, 1, 0, 1, 1)
#define SET_USER_CODE_SEGMENT(g, segment_limit, base_address) SET_GDT_ENTRY(g, (USER_CODE_SEG/8), segment_limit, base_address, 0xa, 1, 3, 1, 1)
#define SET_USER_DATA_SEGMENT(g, segment_limit, base_address) SET_GDT_ENTRY(g, (USER_DATA_SEG/8), segment_limit, base_address, 2, 1, 3, 1, 1)
#define SET_USER_CODE_SEGMENT_IN_LDT(l, segment_limit, base_address) SET_GDT_ENTRY(l, (USER_CODE_SEG_IN_LDT/8), segment_limit, base_address, 0xa, 1, 3, 1, 1)
#define SET_USER_DATA_SEGMENT_IN_LDT(l, segment_limit, base_address) SET_GDT_ENTRY(l, (USER_DATA_SEG_IN_LDT/8), segment_limit, base_address, 2, 1, 3, 1, 1)
#define SET_TASK_SEGMENT(g, segment_limit, base_address, segment) SET_GDT_ENTRY(g, (segment/8), segment_limit, base_address, 9, 0, 3, 0, 0)
#define SET_LDT_DESCRIPTOR(g, segment_limit, base_address) SET_GDT_ENTRY(g, (LDT_SELECTOR/8), segment_limit, base_address, 2, 0, 3, 0, 0)
#define SET_IDT_ENTRY(idt, index, offset, _segment_selector, _type, _dpl, _present) { \
struct idt_entry *entry = idt+index; \
memset(entry, 0, sizeof(struct idt_entry)); \
entry->offset_low = (int)offset & 0xffff; \
entry->offset_high = ((int)offset >> 16) & 0xffff; \
entry->segment_selector = _segment_selector; \
entry->type = _type; \
entry->dpl = _dpl; \
entry->present = _present; \
}
#define SET_INTERRUPT_GATE(idt, index, offset) { \
SET_IDT_ENTRY(idt, index, offset, KERNEL_CODE_SEG, 0xe, 3, 1); \
}
#define SET_TRAP_GATE(idt, index, offset) { \
SET_IDT_ENTRY(idt, index, offset, KERNEL_CODE_SEG, 0xf, 3, 1); \
}
#define SET_TASK_GATE(idt, index) { \
SET_IDT_ENTRY(idt, index, 0, KERNEL_CODE_SEG, 0x5, 3, 1); \
}
struct regs_frame {
u32 trap_nr;
u32 gs;
u32 fs;
u32 es;
u32 ds;
u32 edi;
u32 esi;
u32 ebp;
u32 orig_esp;
u32 ebx;
u32 edx;
u32 ecx;
u32 eax;
u32 code_nr;
u32 eip;
u32 cs;
u32 eflags;
u32 esp;
u32 ss;
}__attribute__((packed));
typedef void (*idt_function_type)();
void setup32();
void set_idt(int vector, idt_function_type idt_function);
void loadGDT32();
void loadLDT32();
void loadIDT32();
void initializeTSS32(int smp_id);
void loadTSS32(int smp_id);
#endif