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Tests

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This commit is contained in:
Baptiste Wicht 2014-01-19 21:46:50 +01:00
parent 1968215fb6
commit e51a78eba1
5 changed files with 30 additions and 19 deletions
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2
kernel/include/gdt.hpp
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@ -106,6 +106,8 @@ struct task_state_segment_t {
uint16_t io_map_base_address;
};
extern task_state_segment_t tss;
void flush_tss();
} //end of namespace gdt

16
kernel/src/boot/boot_16.cpp
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@ -35,6 +35,9 @@ constexpr const uint16_t DEFAULT_BPP = 32;
#define CODE_16
#include "gdt.hpp"
//The Task State Segment
gdt::task_state_segment_t gdt::tss;
#include "e820.hpp" //Just for the address of the e820 map
e820::bios_e820_entry e820::bios_e820_entries[e820::MAX_E820_ENTRIES];
@ -350,9 +353,6 @@ gdt::gdt_descriptor_t user_data_descriptor(){
return descriptor;
}
//The Task State Segment
static gdt::task_state_segment_t tss;
//TODO On some machines, this should be aligned to 16 bits
static gdt::gdt_descriptor_t gdt[8];
@ -369,7 +369,7 @@ void setup_gdt(){
//2. Init TSS Descriptor
uint32_t base = reinterpret_cast<uint32_t>(&tss);
uint32_t base = reinterpret_cast<uint32_t>(&gdt::tss);
uint32_t limit = base + sizeof(gdt::task_state_segment_t);
auto tss_selector = reinterpret_cast<gdt::tss_descriptor_t*>(&gdt[6]);
@ -387,7 +387,7 @@ void setup_gdt(){
tss_selector->base_high = 0; //Top 32 bits are clear
tss_selector->limit_low = limit & 0xFFFF; //Low 16 bits
tss_selector->limit_high = (limit&0xF0000) >> 16; //Top 4 bits
tss_selector->limit_high = (limit & 0xF0000) >> 16; //Top 4 bits
//3. Init the GDT Pointer
@ -397,6 +397,12 @@ void setup_gdt(){
//4. Load the GDT
asm volatile("lgdt [%0]" : : "m" (gdtr));
//5. Zero-out the TSS
auto tss_ptr = reinterpret_cast<char*>(&gdt::tss);
for(unsigned int i = 0; i < sizeof(gdt::task_state_segment_t); ++i){
*tss_ptr++ = 0;
}
}
void protected_mode_enable(){

2
kernel/src/gdt.cpp
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@ -8,5 +8,5 @@
#include "gdt.hpp"
void gdt::flush_tss(){
asm volatile("mov ax, 0x33; ltr ax;" : : : "rax");
asm volatile("mov ax, %0; ltr ax;" : : "i" (gdt::TSS_SELECTOR + 0x3) : "rax");
}

21
kernel/src/interrupts.cpp
View File

@ -154,17 +154,16 @@ void install_irqs(){
}
void install_syscalls(){
idt_set_gate(interrupt::SYSCALL_FIRST, _syscall0, gdt::LONG_SELECTOR, 0x8E);
idt_set_gate(interrupt::SYSCALL_FIRST+1, _syscall1, gdt::LONG_SELECTOR, 0x8E);
idt_set_gate(interrupt::SYSCALL_FIRST+2, _syscall2, gdt::LONG_SELECTOR, 0x8E);
idt_set_gate(interrupt::SYSCALL_FIRST+3, _syscall3, gdt::LONG_SELECTOR, 0x8E);
idt_set_gate(interrupt::SYSCALL_FIRST+4, _syscall4, gdt::LONG_SELECTOR, 0x8E);
idt_set_gate(interrupt::SYSCALL_FIRST+5, _syscall5, gdt::LONG_SELECTOR, 0x8E);
idt_set_gate(interrupt::SYSCALL_FIRST+6, _syscall6, gdt::LONG_SELECTOR, 0x8E);
idt_set_gate(interrupt::SYSCALL_FIRST+7, _syscall7, gdt::LONG_SELECTOR, 0x8E);
idt_set_gate(interrupt::SYSCALL_FIRST+8, _syscall8, gdt::LONG_SELECTOR, 0x8E);
idt_set_gate(interrupt::SYSCALL_FIRST+9, _syscall9, gdt::LONG_SELECTOR, 0x8E);
idt_set_gate(interrupt::SYSCALL_FIRST, _syscall0, gdt::LONG_SELECTOR, 0xEE);
idt_set_gate(interrupt::SYSCALL_FIRST+1, _syscall1, gdt::LONG_SELECTOR, 0xEE);
idt_set_gate(interrupt::SYSCALL_FIRST+2, _syscall2, gdt::LONG_SELECTOR, 0xEE);
idt_set_gate(interrupt::SYSCALL_FIRST+3, _syscall3, gdt::LONG_SELECTOR, 0xEE);
idt_set_gate(interrupt::SYSCALL_FIRST+4, _syscall4, gdt::LONG_SELECTOR, 0xEE);
idt_set_gate(interrupt::SYSCALL_FIRST+5, _syscall5, gdt::LONG_SELECTOR, 0xEE);
idt_set_gate(interrupt::SYSCALL_FIRST+6, _syscall6, gdt::LONG_SELECTOR, 0xEE);
idt_set_gate(interrupt::SYSCALL_FIRST+7, _syscall7, gdt::LONG_SELECTOR, 0xEE);
idt_set_gate(interrupt::SYSCALL_FIRST+8, _syscall8, gdt::LONG_SELECTOR, 0xEE);
idt_set_gate(interrupt::SYSCALL_FIRST+9, _syscall9, gdt::LONG_SELECTOR, 0xEE);
}
void enable_interrupts(){

8
kernel/src/shell.cpp
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@ -911,12 +911,16 @@ void exec_command(const std::vector<std::string>& params){
auto stack_physical = allocate_user_stack(0x500000, paging::PAGE_SIZE * 2, paging::PRESENT | paging::WRITE | paging::USER);
if(stack_physical){
asm volatile("cli; mov ax, %0; mov ds, ax; mov es, ax; mov fs, ax; mov gs, ax;"
uint64_t rsp;
asm volatile("mov %0, rsp;" : "=m" (rsp));
gdt::tss.rsp0 = rsp;
asm volatile("mov ax, %0; mov ds, ax; mov es, ax; mov fs, ax; mov gs, ax;"
: //No outputs
: "i" (gdt::USER_DATA_SELECTOR + 3)
: "rax");
asm volatile("push %0; push %1; pushfq; push %2; push %3; xchg bx, bx; iretq"
asm volatile("push %0; push %1; pushfq; push %2; push %3; iretq"
: //No outputs
: "i" (gdt::USER_DATA_SELECTOR + 3), "i" (0x500000 + paging::PAGE_SIZE * 2 - 64), "i" (gdt::USER_CODE_SELECTOR + 3), "r" (header->e_entry)
: "rax");