/* * arch/s390/kernel/relocate_kernel.S * * (C) Copyright IBM Corp. 2005 * * Author(s): Rolf Adelsberger, * Heiko Carstens <heiko.carstens@de.ibm.com> * */ /* * moves the new kernel to its destination... * %r2 = pointer to first kimage_entry_t * %r3 = start address - where to jump to after the job is done... * * %r5 will be used as temp. storage * %r6 holds the destination address * %r7 = PAGE_SIZE * %r8 holds the source address * %r9 = PAGE_SIZE * %r10 is a page mask */ .text .globl relocate_kernel relocate_kernel: basr %r13,0 # base address .base: stnsm sys_msk-.base(%r13),0xfb # disable DAT stctl %c0,%c15,ctlregs-.base(%r13) stm %r0,%r15,gprregs-.base(%r13) la %r1,load_psw-.base(%r13) mvc 0(8,%r0),0(%r1) la %r0,.back-.base(%r13) st %r0,4(%r0) oi 4(%r0),0x80 mvc 0x68(8,%r0),0(%r1) la %r0,.back_pgm-.base(%r13) st %r0,0x6c(%r0) oi 0x6c(%r0),0x80 lhi %r0,0 diag %r0,%r0,0x308 .back: basr %r13,0 .back_base: oi have_diag308-.back_base(%r13),0x01 lctl %c0,%c15,ctlregs-.back_base(%r13) lm %r0,%r15,gprregs-.back_base(%r13) j .start_reloc .back_pgm: lm %r0,%r15,gprregs-.base(%r13) .start_reloc: lhi %r10,-1 # preparing the mask sll %r10,12 # shift it such that it becomes 0xf000 .top: lhi %r7,4096 # load PAGE_SIZE in r7 lhi %r9,4096 # load PAGE_SIZE in r9 l %r5,0(%r2) # read another word for indirection page ahi %r2,4 # increment pointer tml %r5,0x1 # is it a destination page? je .indir_check # NO, goto "indir_check" lr %r6,%r5 # r6 = r5 nr %r6,%r10 # mask it out and... j .top # ...next iteration .indir_check: tml %r5,0x2 # is it a indirection page? je .done_test # NO, goto "done_test" nr %r5,%r10 # YES, mask out, lr %r2,%r5 # move it into the right register, j .top # and read next... .done_test: tml %r5,0x4 # is it the done indicator? je .source_test # NO! Well, then it should be the source indicator... j .done # ok, lets finish it here... .source_test: tml %r5,0x8 # it should be a source indicator... je .top # NO, ignore it... lr %r8,%r5 # r8 = r5 nr %r8,%r10 # masking 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0 jo 0b j .top .done: sr %r0,%r0 # clear register r0 la %r4,load_psw-.base(%r13) # load psw-address into the register o %r3,4(%r4) # or load address into psw st %r3,4(%r4) mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0 tm have_diag308-.base(%r13),0x01 jno .no_diag308 diag %r0,%r0,0x308 .no_diag308: sr %r1,%r1 # clear %r1 sr %r2,%r2 # clear %r2 sigp %r1,%r2,0x12 # set cpuid to zero lpsw 0 # hopefully start new kernel... .align 8 load_psw: .long 0x00080000,0x80000000 sys_msk: .quad 0 ctlregs: .rept 16 .long 0 .endr gprregs: .rept 16 .long 0 .endr have_diag308: .byte 0 .align 8 relocate_kernel_end: .globl relocate_kernel_len relocate_kernel_len: .quad relocate_kernel_end - relocate_kernel