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[PATCH] Add some comments to entry.S
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And remove some old obsolete ones.
Signed-off-by: Andi Kleen <ak@suse.de>
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Andi Kleen authored and Andi Kleen committed Sep 26, 2006
1 parent 107878b commit 2e91a17
Showing 1 changed file with 15 additions and 3 deletions.
18 changes: 15 additions & 3 deletions arch/x86_64/kernel/entry.S
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* at the top of the kernel process stack.
* - partial stack frame: partially saved registers upto R11.
* - full stack frame: Like partial stack frame, but all register saved.
*
* TODO:
* - schedule it carefully for the final hardware.
*
* Some macro usage:
* - CFI macros are used to generate dwarf2 unwind information for better
* backtraces. They don't change any code.
* - SAVE_ALL/RESTORE_ALL - Save/restore all registers
* - SAVE_ARGS/RESTORE_ARGS - Save/restore registers that C functions modify.
* There are unfortunately lots of special cases where some registers
* not touched. The macro is a big mess that should be cleaned up.
* - SAVE_REST/RESTORE_REST - Handle the registers not saved by SAVE_ARGS.
* Gives a full stack frame.
* - ENTRY/END Define functions in the symbol table.
* - FIXUP_TOP_OF_STACK/RESTORE_TOP_OF_STACK - Fix up the hardware stack
* frame that is otherwise undefined after a SYSCALL
* - TRACE_IRQ_* - Trace hard interrupt state for lock debugging.
* - errorentry/paranoidentry/zeroentry - Define exception entry points.
*/

#include <linux/linkage.h>
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