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78 lines
2.1 KiB
78 lines
2.1 KiB
/* 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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cghi %r3,0 |
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je .diag |
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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: |
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diag %r0,%r0,0x308 |
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ENDPROC(relocate_kernel) |
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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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