| /* |
| * 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),0xf8 # disable DAT and IRQ (external) |
| spx zero64-.base(%r13) # absolute addressing mode |
| 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 |
| zero64: |
| .quad 0 |
| 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 |
