| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright IBM Corp. 2005 |
| * |
| * Author(s): Rolf Adelsberger, |
| * Heiko Carstens <heiko.carstens@de.ibm.com> |
| * |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/page.h> |
| #include <asm/sigp.h> |
| |
| /* |
| * 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 |
| * |
| * 0xf000 is a page_mask |
| */ |
| |
| .text |
| ENTRY(relocate_kernel) |
| basr %r13,0 # base address |
| .base: |
| lghi %r7,PAGE_SIZE # load PAGE_SIZE in r7 |
| lghi %r9,PAGE_SIZE # load PAGE_SIZE in r9 |
| lg %r5,0(%r2) # read another word for indirection page |
| aghi %r2,8 # increment pointer |
| tml %r5,0x1 # is it a destination page? |
| je .indir_check # NO, goto "indir_check" |
| lgr %r6,%r5 # r6 = r5 |
| nill %r6,0xf000 # mask it out and... |
| j .base # ...next iteration |
| .indir_check: |
| tml %r5,0x2 # is it a indirection page? |
| je .done_test # NO, goto "done_test" |
| nill %r5,0xf000 # YES, mask out, |
| lgr %r2,%r5 # move it into the right register, |
| j .base # 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 .base # NO, ignore it... |
| lgr %r8,%r5 # r8 = r5 |
| nill %r8,0xf000 # masking |
| 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0 |
| jo 0b |
| j .base |
| .done: |
| sgr %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 |
| diag %r0,%r0,0x308 |
| |
| .align 8 |
| load_psw: |
| .long 0x00080000,0x80000000 |
| relocate_kernel_end: |
| .align 8 |
| .globl relocate_kernel_len |
| relocate_kernel_len: |
| .quad relocate_kernel_end - relocate_kernel |
