projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| cf13f0ea | 2 | /* |
| a53c8fab | 3 | * Copyright IBM Corp. 2005 |
| cf13f0ea | 4 | * |
| 25d83cbf | 5 | * Author(s): Rolf Adelsberger, |
| 5d3f229f | 6 | * Heiko Carstens <heiko.carstens@de.ibm.com> |
| cf13f0ea HC |
7 | * |
| 8 | */ | |
| 9 | ||
| 144d634a | 10 | #include <linux/linkage.h> |
| f1c1174f | 11 | #include <asm/page.h> |
| eb546195 | 12 | #include <asm/sigp.h> |
| 144d634a | 13 | |
| cf13f0ea HC |
14 | /* |
| 15 | * moves the new kernel to its destination... | |
| 16 | * %r2 = pointer to first kimage_entry_t | |
| 17 | * %r3 = start address - where to jump to after the job is done... | |
| 18 | * | |
| 19 | * %r5 will be used as temp. storage | |
| 20 | * %r6 holds the destination address | |
| 21 | * %r7 = PAGE_SIZE | |
| 22 | * %r8 holds the source address | |
| 23 | * %r9 = PAGE_SIZE | |
| 24 | * | |
| 25 | * 0xf000 is a page_mask | |
| 26 | */ | |
| 27 | ||
| 28 | .text | |
| 144d634a | 29 | ENTRY(relocate_kernel) |
| 25d83cbf | 30 | basr %r13,0 # base address |
| cf13f0ea | 31 | .base: |
| f1c1174f HC |
32 | lghi %r7,PAGE_SIZE # load PAGE_SIZE in r7 |
| 33 | lghi %r9,PAGE_SIZE # load PAGE_SIZE in r9 | |
| 25d83cbf HC |
34 | lg %r5,0(%r2) # read another word for indirection page |
| 35 | aghi %r2,8 # increment pointer | |
| 36 | tml %r5,0x1 # is it a destination page? | |
| 37 | je .indir_check # NO, goto "indir_check" | |
| 38 | lgr %r6,%r5 # r6 = r5 | |
| 39 | nill %r6,0xf000 # mask it out and... | |
| d485235b | 40 | j .base # ...next iteration |
| cf13f0ea | 41 | .indir_check: |
| 25d83cbf HC |
42 | tml %r5,0x2 # is it a indirection page? |
| 43 | je .done_test # NO, goto "done_test" | |
| 44 | nill %r5,0xf000 # YES, mask out, | |
| 45 | lgr %r2,%r5 # move it into the right register, | |
| d485235b | 46 | j .base # and read next... |
| cf13f0ea | 47 | .done_test: |
| 25d83cbf HC |
48 | tml %r5,0x4 # is it the done indicator? |
| 49 | je .source_test # NO! Well, then it should be the source indicator... | |
| 50 | j .done # ok, lets finish it here... | |
| cf13f0ea | 51 | .source_test: |
| 25d83cbf | 52 | tml %r5,0x8 # it should be a source indicator... |
| d485235b | 53 | je .base # NO, ignore it... |
| 25d83cbf HC |
54 | lgr %r8,%r5 # r8 = r5 |
| 55 | nill %r8,0xf000 # masking | |
| 56 | 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0 | |
| cf13f0ea | 57 | jo 0b |
| d485235b | 58 | j .base |
| cf13f0ea | 59 | .done: |
| 25d83cbf HC |
60 | sgr %r0,%r0 # clear register r0 |
| 61 | la %r4,load_psw-.base(%r13) # load psw-address into the register | |
| 62 | o %r3,4(%r4) # or load address into psw | |
| cf13f0ea | 63 | st %r3,4(%r4) |
| 25d83cbf | 64 | mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0 |
| 5d3f229f | 65 | diag %r0,%r0,0x308 |
| cf13f0ea | 66 | |
| 25d83cbf | 67 | .align 8 |
| cf13f0ea HC |
68 | load_psw: |
| 69 | .long 0x00080000,0x80000000 | |
| cf13f0ea | 70 | relocate_kernel_end: |
| 144d634a | 71 | .align 8 |
| cf13f0ea HC |
72 | .globl relocate_kernel_len |
| 73 | relocate_kernel_len: | |
| 74 | .quad relocate_kernel_end - relocate_kernel |