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Diffstat (limited to 'i386/util/NOTES')
| -rw-r--r-- | i386/util/NOTES | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/i386/util/NOTES b/i386/util/NOTES new file mode 100644 index 0000000..770bbef --- /dev/null +++ b/i386/util/NOTES @@ -0,0 +1,35 @@ + +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() + + |