sambuc/atomthreads
1
0
Fork 0
mirror of https://github.com/kelvinlawson/atomthreads.git synced 2026-01-19 22:33:15 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

Improve context-switch comments.

Browse Source
This commit is contained in:
Kelvin Lawson
2010-02-09 23:05:44 +00:00
parent 65dc87ae36
commit 4e55f225d3
1 changed files with 2 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
ports/avr/atomport-asm.s
View File

@@ -118,7 +118,7 @@ archContextSwitch:
* the old TCB is still untouched in R25-R24. We have saved R16/R17
* and R28/R29 so we can use them for our own purposes now. We must be
* careful not to use R23-R22, however, as these still contain the
* other parameter, old_tcb_ptr.
* other parameter, new_tcb_ptr.
*/
in r16,_SFR_IO_ADDR(SPL) /* Get the current SP into general regs */
in r17,_SFR_IO_ADDR(SPH) /* R16/R17 which are now free to use. */
@@ -126,7 +126,7 @@ archContextSwitch:
mov r28,r24 /* Move old_tcb_ptr param into the Y-regs so we */
mov r29,r25 /* can access the TCB via a pointer. */
st Y,r16 /* Store SPH/SPL to new_tcb_ptr->tcb_save_ptr which */
st Y,r16 /* Store SPH/SPL to old_tcb_ptr->tcb_save_ptr which */
std Y+1,r17 /* is conveniently the first member of the TCB. */