75 lines
2 KiB
ArmAsm
75 lines
2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright IBM Corp. 2005
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*
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* Author(s): Rolf Adelsberger,
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* Heiko Carstens <heiko.carstens@de.ibm.com>
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*
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*/
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#include <linux/linkage.h>
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#include <asm/page.h>
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#include <asm/sigp.h>
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/*
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* moves the new kernel to its destination...
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* %r2 = pointer to first kimage_entry_t
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* %r3 = start address - where to jump to after the job is done...
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*
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* %r5 will be used as temp. storage
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* %r6 holds the destination address
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* %r7 = PAGE_SIZE
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* %r8 holds the source address
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* %r9 = PAGE_SIZE
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*
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* 0xf000 is a page_mask
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*/
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.text
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ENTRY(relocate_kernel)
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basr %r13,0 # base address
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.base:
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lghi %r7,PAGE_SIZE # load PAGE_SIZE in r7
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lghi %r9,PAGE_SIZE # load PAGE_SIZE in r9
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lg %r5,0(%r2) # read another word for indirection page
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aghi %r2,8 # increment pointer
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tml %r5,0x1 # is it a destination page?
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je .indir_check # NO, goto "indir_check"
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lgr %r6,%r5 # r6 = r5
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nill %r6,0xf000 # mask it out and...
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j .base # ...next iteration
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.indir_check:
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tml %r5,0x2 # is it a indirection page?
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je .done_test # NO, goto "done_test"
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nill %r5,0xf000 # YES, mask out,
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lgr %r2,%r5 # move it into the right register,
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j .base # and read next...
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.done_test:
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tml %r5,0x4 # is it the done indicator?
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je .source_test # NO! Well, then it should be the source indicator...
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j .done # ok, lets finish it here...
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.source_test:
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tml %r5,0x8 # it should be a source indicator...
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je .base # NO, ignore it...
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lgr %r8,%r5 # r8 = r5
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nill %r8,0xf000 # masking
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0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0
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jo 0b
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j .base
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.done:
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sgr %r0,%r0 # clear register r0
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la %r4,load_psw-.base(%r13) # load psw-address into the register
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o %r3,4(%r4) # or load address into psw
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st %r3,4(%r4)
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mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
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diag %r0,%r0,0x308
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.align 8
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load_psw:
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.long 0x00080000,0x80000000
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relocate_kernel_end:
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.align 8
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.globl relocate_kernel_len
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relocate_kernel_len:
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.quad relocate_kernel_end - relocate_kernel
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