- lgr %r9,%r3 # end of mem
- larl %r1,.Lchkmem # set program check address
- stg %r1,__LC_PGM_NEW_PSW+8
- la %r1,1 # test in increments of 128KB
- sllg %r1,%r1,17
- larl %r3,memory_chunk
- slgr %r4,%r4 # set start of chunk to zero
- slgr %r5,%r5 # set end of chunk to zero
- slr %r6,%r6 # set access code to zero
- la %r10,MEMORY_CHUNKS # number of chunks
-.Lloop:
- tprot 0(%r5),0 # test protection of first byte
- ipm %r7
- srl %r7,28
- clr %r6,%r7 # compare cc with last access code
- je .Lsame
- j .Lchkmem
-.Lsame:
- algr %r5,%r1 # add 128KB to end of chunk
- # no need to check here,
- brc 12,.Lloop # this is the same chunk
-.Lchkmem: # > 16EB or tprot got a program check
- clgr %r4,%r5 # chunk size > 0?
- je .Lchkloop
- stg %r4,0(%r3) # store start address of chunk
- lgr %r0,%r5
- slgr %r0,%r4
- stg %r0,8(%r3) # store size of chunk
- st %r6,20(%r3) # store type of chunk
- la %r3,24(%r3)
- larl %r8,memory_size
- stg %r5,0(%r8) # store memory size
- ahi %r10,-1 # update chunk number
-.Lchkloop:
- lr %r6,%r7 # set access code to last cc
- # we got an exception or we're starting a new
- # chunk , we must check if we should
- # still try to find valid memory (if we detected
- # the amount of available storage), and if we
- # have chunks left
- lghi %r4,1
- sllg %r4,%r4,31
- clgr %r5,%r4
- je .Lhsaskip
- xr %r0, %r0
- clgr %r0, %r9 # did we detect memory?
- je .Ldonemem # if not, leave
- chi %r10, 0 # do we have chunks left?
- je .Ldonemem
-.Lhsaskip:
- algr %r5,%r1 # add 128KB to end of chunk
- lgr %r4,%r5 # potential new chunk
- clgr %r5,%r9 # should we go on?
- jl .Lloop
-.Ldonemem:
-
- larl %r12,machine_flags
+ larl %r15,init_thread_union
+ lg %r14,__TI_task(%r15) # cache current in lowcore
+ stg %r14,__LC_CURRENT
+ aghi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
+ stg %r15,__LC_KERNEL_STACK # set end of kernel stack
+ aghi %r15,-160
+ xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain