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将内核定位到高地址（存在bug，中断时会访问低地址）

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This commit is contained in:
fslongjin
2022-04-10 21:30:16 +08:00
parent 3063a340e2
commit f5f36aafd8
23 changed files with 689 additions and 238 deletions
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56
kernel/exception/gate.h
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@ -10,6 +10,7 @@
#define __GATE_H__
#include "../common/kprint.h"
#include <mm/mm.h>
//描述符表的结构体
struct desc_struct
@ -27,6 +28,18 @@ extern struct desc_struct GDT_Table[]; // GDT_Table是head.S中的GDT_Table
extern struct gate_struct IDT_Table[]; // IDT_Table是head.S中的IDT_Table
extern unsigned int TSS64_Table[26];
struct gdtr
{
uint16_t size;
uint64_t gdt_vaddr;
}__attribute__((packed));
struct idtr
{
uint16_t size;
uint64_t idt_vaddr;
}__attribute__((packed));
/**
* @brief 初始化中段描述符表内的门描述符（每个16B）
* @param gate_selector_addr IDT表项的地址
@ -86,8 +99,10 @@ void set_tss_descriptor(unsigned int n, void *addr)
{
unsigned long limit = 103;
*(unsigned long *)(&GDT_Table[n]) = (limit & 0xffff) | (((unsigned long)addr & 0xffff) << 16) | ((((unsigned long)addr >> 16) & 0xff) << 32) | ((unsigned long)0x89 << 40) | ((limit >> 16 & 0xf) << 48) | (((unsigned long)addr >> 24 & 0xff) << 56); /////89 is attribute
*(unsigned long *)(&GDT_Table[n + 1]) = (((unsigned long)addr >> 32) & 0xffffffff) | 0;
*(unsigned long *)(phys_2_virt(GDT_Table) + n) = (limit & 0xffff) | (((unsigned long)addr & 0xffff) << 16) | ((((unsigned long)addr >> 16) & 0xff) << 32) | ((unsigned long)0x89 << 40) | ((limit >> 16 & 0xf) << 48) | (((unsigned long)addr >> 24 & 0xff) << 56); /////89 is attribute
kdebug("1212");
*(unsigned long *)(phys_2_virt(GDT_Table) + n + 1) = (((unsigned long)addr >> 32) & 0xffffffff) | 0;
}
/**
@ -110,8 +125,9 @@ void set_tss_descriptor(unsigned int n, void *addr)
*/
void set_intr_gate(unsigned int n, unsigned char ist, void *addr)
{
_set_gate((IDT_Table + n), 0x8E, ist, addr); // p=1，DPL=0, type=E
// set_gate((ul *)(IDT_Table + n), 0x8E, ist, (ul *)(addr)); // p=1，DPL=0, type=E
_set_gate(phys_2_virt(IDT_Table + n), 0x8E, ist, addr); // p=1，DPL=0, type=E
//set_gate((ul *)phys_2_virt(IDT_Table + n), 0x8E, ist, (ul *)(addr)); // p=1，DPL=0, type=E
}
/**
@ -125,8 +141,8 @@ void set_trap_gate(unsigned int n, unsigned char ist, void *addr)
{
// kdebug("addr=%#018lx", (ul)(addr));
// set_gate((ul *)(IDT_Table + n), 0x8F, ist, (ul *)(addr)); // p=1，DPL=0, type=F
_set_gate((IDT_Table + n), 0x8F, ist, addr); // p=1，DPL=0, type=F
//set_gate((ul *)phys_2_virt(IDT_Table + n), 0x8F, ist, (ul *)(addr)); // p=1，DPL=0, type=F
_set_gate(phys_2_virt(IDT_Table + n), 0x8F, ist, addr); // p=1，DPL=0, type=F
}
/**
@ -140,8 +156,8 @@ void set_system_trap_gate(unsigned int n, unsigned char ist, void *addr)
{
// kdebug("addr=%#018lx", (ul)(addr));
// set_gate((ul *)(IDT_Table + n), 0xEF, ist, (ul *)(addr)); // p=1，DPL=3, type=F
_set_gate((IDT_Table + n), 0xEF, ist, addr); // p=1，DPL=3, type=F
//set_gate((ul *)phys_2_virt(IDT_Table + n), 0xEF, ist, (ul *)(addr)); // p=1，DPL=3, type=F
_set_gate(phys_2_virt(IDT_Table + n), 0xEF, ist, addr); // p=1，DPL=3, type=F
}
/**
@ -149,19 +165,19 @@ void set_system_trap_gate(unsigned int n, unsigned char ist, void *addr)
*
*/
void set_tss64(unsigned int * Table,unsigned long rsp0,unsigned long rsp1,unsigned long rsp2,unsigned long ist1,unsigned long ist2,unsigned long ist3,
unsigned long ist4,unsigned long ist5,unsigned long ist6,unsigned long ist7)
void set_tss64(unsigned int *Table, unsigned long rsp0, unsigned long rsp1, unsigned long rsp2, unsigned long ist1, unsigned long ist2, unsigned long ist3,
unsigned long ist4, unsigned long ist5, unsigned long ist6, unsigned long ist7)
{
*(unsigned long *)(Table+1) = rsp0;
*(unsigned long *)(Table+3) = rsp1;
*(unsigned long *)(Table+5) = rsp2;
*(unsigned long *)(Table + 1) = rsp0;
*(unsigned long *)(Table + 3) = rsp1;
*(unsigned long *)(Table + 5) = rsp2;
*(unsigned long *)(Table+9) = ist1;
*(unsigned long *)(Table+11) = ist2;
*(unsigned long *)(Table+13) = ist3;
*(unsigned long *)(Table+15) = ist4;
*(unsigned long *)(Table+17) = ist5;
*(unsigned long *)(Table+19) = ist6;
*(unsigned long *)(Table+21) = ist7;
*(unsigned long *)(Table + 9) = ist1;
*(unsigned long *)(Table + 11) = ist2;
*(unsigned long *)(Table + 13) = ist3;
*(unsigned long *)(Table + 15) = ist4;
*(unsigned long *)(Table + 17) = ist5;
*(unsigned long *)(Table + 19) = ist6;
*(unsigned long *)(Table + 21) = ist7;
}
#endif