Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/s390/kernel/relocate_kernel.S |
| 3 | * |
| 4 | * (C) Copyright IBM Corp. 2005 |
| 5 | * |
Heiko Carstens | 25d83cb | 2006-09-28 16:56:37 +0200 | [diff] [blame] | 6 | * Author(s): Rolf Adelsberger, |
Heiko Carstens | 5d3f229 | 2005-08-01 21:11:33 -0700 | [diff] [blame] | 7 | * Heiko Carstens <heiko.carstens@de.ibm.com> |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 8 | * |
| 9 | */ |
| 10 | |
Jan Glauber | 144d634 | 2011-07-24 10:48:19 +0200 | [diff] [blame] | 11 | #include <linux/linkage.h> |
| 12 | |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 13 | /* |
| 14 | * moves the new kernel to its destination... |
| 15 | * %r2 = pointer to first kimage_entry_t |
| 16 | * %r3 = start address - where to jump to after the job is done... |
| 17 | * |
| 18 | * %r5 will be used as temp. storage |
| 19 | * %r6 holds the destination address |
| 20 | * %r7 = PAGE_SIZE |
| 21 | * %r8 holds the source address |
| 22 | * %r9 = PAGE_SIZE |
| 23 | * %r10 is a page mask |
| 24 | */ |
| 25 | |
| 26 | .text |
Jan Glauber | 144d634 | 2011-07-24 10:48:19 +0200 | [diff] [blame] | 27 | ENTRY(relocate_kernel) |
Heiko Carstens | 25d83cb | 2006-09-28 16:56:37 +0200 | [diff] [blame] | 28 | basr %r13,0 # base address |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 29 | .base: |
Heiko Carstens | 15e9b58 | 2006-12-04 15:40:26 +0100 | [diff] [blame] | 30 | stnsm sys_msk-.base(%r13),0xfb # disable DAT |
Heiko Carstens | 5d3f229 | 2005-08-01 21:11:33 -0700 | [diff] [blame] | 31 | stctl %c0,%c15,ctlregs-.base(%r13) |
| 32 | stm %r0,%r15,gprregs-.base(%r13) |
| 33 | la %r1,load_psw-.base(%r13) |
Heiko Carstens | 25d83cb | 2006-09-28 16:56:37 +0200 | [diff] [blame] | 34 | mvc 0(8,%r0),0(%r1) |
Heiko Carstens | 5d3f229 | 2005-08-01 21:11:33 -0700 | [diff] [blame] | 35 | la %r0,.back-.base(%r13) |
| 36 | st %r0,4(%r0) |
| 37 | oi 4(%r0),0x80 |
| 38 | mvc 0x68(8,%r0),0(%r1) |
| 39 | la %r0,.back_pgm-.base(%r13) |
| 40 | st %r0,0x6c(%r0) |
| 41 | oi 0x6c(%r0),0x80 |
| 42 | lhi %r0,0 |
| 43 | diag %r0,%r0,0x308 |
| 44 | .back: |
| 45 | basr %r13,0 |
| 46 | .back_base: |
| 47 | oi have_diag308-.back_base(%r13),0x01 |
| 48 | lctl %c0,%c15,ctlregs-.back_base(%r13) |
| 49 | lm %r0,%r15,gprregs-.back_base(%r13) |
| 50 | j .start_reloc |
| 51 | .back_pgm: |
| 52 | lm %r0,%r15,gprregs-.base(%r13) |
| 53 | .start_reloc: |
Heiko Carstens | 25d83cb | 2006-09-28 16:56:37 +0200 | [diff] [blame] | 54 | lhi %r10,-1 # preparing the mask |
| 55 | sll %r10,12 # shift it such that it becomes 0xf000 |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 56 | .top: |
Heiko Carstens | 25d83cb | 2006-09-28 16:56:37 +0200 | [diff] [blame] | 57 | lhi %r7,4096 # load PAGE_SIZE in r7 |
| 58 | lhi %r9,4096 # load PAGE_SIZE in r9 |
| 59 | l %r5,0(%r2) # read another word for indirection page |
| 60 | ahi %r2,4 # increment pointer |
| 61 | tml %r5,0x1 # is it a destination page? |
| 62 | je .indir_check # NO, goto "indir_check" |
| 63 | lr %r6,%r5 # r6 = r5 |
| 64 | nr %r6,%r10 # mask it out and... |
| 65 | j .top # ...next iteration |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 66 | .indir_check: |
Heiko Carstens | 25d83cb | 2006-09-28 16:56:37 +0200 | [diff] [blame] | 67 | tml %r5,0x2 # is it a indirection page? |
| 68 | je .done_test # NO, goto "done_test" |
| 69 | nr %r5,%r10 # YES, mask out, |
| 70 | lr %r2,%r5 # move it into the right register, |
| 71 | j .top # and read next... |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 72 | .done_test: |
Heiko Carstens | 25d83cb | 2006-09-28 16:56:37 +0200 | [diff] [blame] | 73 | tml %r5,0x4 # is it the done indicator? |
| 74 | je .source_test # NO! Well, then it should be the source indicator... |
| 75 | j .done # ok, lets finish it here... |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 76 | .source_test: |
Heiko Carstens | 25d83cb | 2006-09-28 16:56:37 +0200 | [diff] [blame] | 77 | tml %r5,0x8 # it should be a source indicator... |
| 78 | je .top # NO, ignore it... |
| 79 | lr %r8,%r5 # r8 = r5 |
| 80 | nr %r8,%r10 # masking |
| 81 | 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0 |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 82 | jo 0b |
| 83 | j .top |
| 84 | .done: |
Heiko Carstens | 25d83cb | 2006-09-28 16:56:37 +0200 | [diff] [blame] | 85 | sr %r0,%r0 # clear register r0 |
| 86 | la %r4,load_psw-.base(%r13) # load psw-address into the register |
| 87 | o %r3,4(%r4) # or load address into psw |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 88 | st %r3,4(%r4) |
Heiko Carstens | 25d83cb | 2006-09-28 16:56:37 +0200 | [diff] [blame] | 89 | mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0 |
Heiko Carstens | 5d3f229 | 2005-08-01 21:11:33 -0700 | [diff] [blame] | 90 | tm have_diag308-.base(%r13),0x01 |
| 91 | jno .no_diag308 |
| 92 | diag %r0,%r0,0x308 |
| 93 | .no_diag308: |
Heiko Carstens | 25d83cb | 2006-09-28 16:56:37 +0200 | [diff] [blame] | 94 | sr %r1,%r1 # clear %r1 |
| 95 | sr %r2,%r2 # clear %r2 |
| 96 | sigp %r1,%r2,0x12 # set cpuid to zero |
| 97 | lpsw 0 # hopefully start new kernel... |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 98 | |
| 99 | .align 8 |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 100 | load_psw: |
| 101 | .long 0x00080000,0x80000000 |
| 102 | sys_msk: |
| 103 | .quad 0 |
Heiko Carstens | 5d3f229 | 2005-08-01 21:11:33 -0700 | [diff] [blame] | 104 | ctlregs: |
| 105 | .rept 16 |
| 106 | .long 0 |
| 107 | .endr |
| 108 | gprregs: |
| 109 | .rept 16 |
| 110 | .long 0 |
| 111 | .endr |
| 112 | have_diag308: |
| 113 | .byte 0 |
| 114 | .align 8 |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 115 | relocate_kernel_end: |
Jan Glauber | 144d634 | 2011-07-24 10:48:19 +0200 | [diff] [blame] | 116 | .align 8 |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 117 | .globl relocate_kernel_len |
| 118 | relocate_kernel_len: |
| 119 | .quad relocate_kernel_end - relocate_kernel |