| /* |
| * arch/s390/kernel/relocate_kernel.S |
| * |
| * (C) Copyright IBM Corp. 2005 |
| * |
| * Author(s): Rolf Adelsberger <adelsberger@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: |
| spx zero64-.base(%r13) #absolute addressing mode |
| stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQ (external) |
| 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 |
| 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 |
| relocate_kernel_end: |
| .globl relocate_kernel_len |
| relocate_kernel_len: |
| .quad relocate_kernel_end - relocate_kernel |