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raw_switch:
Provides the code to switch between real and protected mode.
Switches between the environments "completely":
e.g. when switching to protected mode,
all the normal protected-mode state for that environment is set up.
raw_pmode:
i16_raw_enter_pmode()
Enters protoected mode from real mode.
Does not initialize IDT or TSS or anything else;
just gets the system into protected mode
with a simple temporary GDT.
Returns with interrupts turned off
(and they'd better stay off until there's a valid pmode IDT!)
i16_raw_leave_pmode()
Assumes paging is turned off.
Returns with interrupts turned off;
they can probably be turned back on at any time.
Depends on:
i16_die()
A20 enable/disable code (e.g. raw_a20).
gdt.h: KERNEL_16_CS, KERNEL_16_DS
vm_param.h:
Must export kvtolin(), lintokv()
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