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/* 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 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 ENDPROC(relocate_kernel) .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 |