diff options
Diffstat (limited to 'arch/s390/kernel/relocate_kernel.S')
| -rw-r--r-- | arch/s390/kernel/relocate_kernel.S | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/arch/s390/kernel/relocate_kernel.S b/arch/s390/kernel/relocate_kernel.S new file mode 100644 index 000000000..0ae297c82 --- /dev/null +++ b/arch/s390/kernel/relocate_kernel.S @@ -0,0 +1,76 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2005 + * + * Author(s): Rolf Adelsberger + * + */ + +#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... + * %r4 = subcode + * + * %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 +SYM_CODE_START(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: + lgr %r0,%r4 # subcode + cghi %r3,0 + je .diag + 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: + diag %r0,%r0,0x308 +SYM_CODE_END(relocate_kernel) + + .balign 8 +SYM_DATA_START_LOCAL(load_psw) + .long 0x00080000,0x80000000 +SYM_DATA_END_LABEL(load_psw, SYM_L_LOCAL, relocate_kernel_end) + .balign 8 +SYM_DATA(relocate_kernel_len, .quad relocate_kernel_end - relocate_kernel) |