diff options
Diffstat (limited to 'src/kernel/arch/amd64/boot64.S')
| -rw-r--r-- | src/kernel/arch/amd64/boot64.S | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/kernel/arch/amd64/boot64.S b/src/kernel/arch/amd64/boot64.S new file mode 100644 index 0000000..f7ec60e --- /dev/null +++ b/src/kernel/arch/amd64/boot64.S @@ -0,0 +1,33 @@ +.global boot64 +boot64: + lgdt (GdtPointer) // try reloading gdt again + mov $(6 << 3 | 3), %ax // SEG_TSS + ltr %ax + + push %rdi // preserve multiboot struct + call sysenter_setup + pop %rdi + + // multiboot struct in %rdi + jmp kmain_early + + +.section .shared +/* https://wiki.osdev.org/Task_State_Segment#Long_Mode */ +.global TSS +.align 8 +TSS: + .4byte 0 /* reserved */ + .rept 3 + .8byte _isr_mini_stack /* stacks for privilege level changes */ + .endr + .8byte 0 /* reserved */ + .rept 7 + .8byte _isr_mini_stack /* IST - stack pointer loaded for interrupts */ + .endr + .8byte 0 /* reserved */ + .4byte 0 /* reserved + IOPB (unused) */ + .if . - TSS != 104 + .error "bad tss size" + .abort + .endif |