6502/COMMON
1
0
Fork 0
mirror of https://github.com/Russell-S-Harper/COMMON.git synced 2024-11-23 17:33:58 +00:00
Code Issues Projects Releases Wiki Activity

Merge pull request #47 from Russell-S-Harper/development

Browse Source 
Adding definition for memory map and status flags.
This commit is contained in:
Russell-S-Harper 2019-03-31 18:37:55 -04:00 committed by GitHub
commit b3e7b3f84c
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
common/common.h
View File

@ -46,6 +46,9 @@
; SVI pq 0e pq (int(Rp)) <- Rq - save indirect via allocated memory offset
; CMR pq 0f pq F <- Rp <=> Rq - compare registers
; 32 bytes in page zero for memory map allocation
_MAP = _R0 - 256 / 8
; 40 bytes in page zero for common registers
_R0 = $100 - 4 * (10 + 10)
_R1 = _R0 + 4
@ -130,6 +133,10 @@ _RPR_I = _RPV_I + 4 ; 2 bytes real memory address
_RPS_I = _RPR_I + 2 ; 1 byte size in pages: code + allocated memory + context switching
_RPF_I = _RPS_I + 1 ; 1 byte status PPPCCCLF: P priority / C counter / L loaded / F finished
; bits for status
_S_L = 1 ; if program is loaded in memory
_S_F = 2 ; if program is finished
_RPE = _RPF_I + 1 ; size of running process entry
_RPL = _RPS / _RPE ; number of running processes limit