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.globl switch
.extern kvar_stack_pma
switch:
# TODO: Check if we come from kernel mode (use kernel stack)
# TODO: restore all registers
mov 96(%rdi), %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
mov (%rdi), %rax
mov %rax, %cr3
push 96(%rdi)
push 64(%rdi)
pushf
pop %rax
or $0x200, %rax # Enable interrupt
mov $0xffffffffbfff, %rbx # NT flag
and %rbx, %rax
push %rax
push 40(%rdi)
push 48(%rdi)
# Perform task switching
iretq
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