projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| cf13f0ea HC |
1 | /* |
| 2 | * arch/s390/kernel/relocate_kernel64.S | |
| 3 | * | |
| 4 | * (C) Copyright IBM Corp. 2005 | |
| 5 | * | |
| 25d83cbf | 6 | * Author(s): Rolf Adelsberger, |
| 5d3f229f | 7 | * Heiko Carstens <heiko.carstens@de.ibm.com> |
| cf13f0ea HC |
8 | * |
| 9 | */ | |
| 10 | ||
| 11 | /* | |
| 12 | * moves the new kernel to its destination... | |
| 13 | * %r2 = pointer to first kimage_entry_t | |
| 14 | * %r3 = start address - where to jump to after the job is done... | |
| 15 | * | |
| 16 | * %r5 will be used as temp. storage | |
| 17 | * %r6 holds the destination address | |
| 18 | * %r7 = PAGE_SIZE | |
| 19 | * %r8 holds the source address | |
| 20 | * %r9 = PAGE_SIZE | |
| 21 | * | |
| 22 | * 0xf000 is a page_mask | |
| 23 | */ | |
| 24 | ||
| 25 | .text | |
| 26 | .globl relocate_kernel | |
| 27 | relocate_kernel: | |
| 25d83cbf | 28 | basr %r13,0 # base address |
| cf13f0ea | 29 | .base: |
| 15e9b586 | 30 | stnsm sys_msk-.base(%r13),0xfb # disable DAT |
| 5d3f229f HC |
31 | stctg %c0,%c15,ctlregs-.base(%r13) |
| 32 | stmg %r0,%r15,gprregs-.base(%r13) | |
| 33 | lghi %r0,3 | |
| 34 | sllg %r0,%r0,31 | |
| 35 | stg %r0,0x1d0(%r0) | |
| 36 | la %r0,.back_pgm-.base(%r13) | |
| 37 | stg %r0,0x1d8(%r0) | |
| 38 | la %r1,load_psw-.base(%r13) | |
| 25d83cbf | 39 | mvc 0(8,%r0),0(%r1) |
| 5d3f229f HC |
40 | la %r0,.back-.base(%r13) |
| 41 | st %r0,4(%r0) | |
| 42 | oi 4(%r0),0x80 | |
| 43 | lghi %r0,0 | |
| 44 | diag %r0,%r0,0x308 | |
| 45 | .back: | |
| 25d83cbf HC |
46 | lhi %r1,1 # mode 1 = esame |
| 47 | sigp %r1,%r0,0x12 # switch to esame mode | |
| 48 | sam64 # switch to 64 bit addressing mode | |
| 5d3f229f HC |
49 | basr %r13,0 |
| 50 | .back_base: | |
| 51 | oi have_diag308-.back_base(%r13),0x01 | |
| 52 | lctlg %c0,%c15,ctlregs-.back_base(%r13) | |
| 53 | lmg %r0,%r15,gprregs-.back_base(%r13) | |
| 54 | j .top | |
| 55 | .back_pgm: | |
| 56 | lmg %r0,%r15,gprregs-.base(%r13) | |
| cf13f0ea | 57 | .top: |
| 25d83cbf HC |
58 | lghi %r7,4096 # load PAGE_SIZE in r7 |
| 59 | lghi %r9,4096 # load PAGE_SIZE in r9 | |
| 60 | lg %r5,0(%r2) # read another word for indirection page | |
| 61 | aghi %r2,8 # increment pointer | |
| 62 | tml %r5,0x1 # is it a destination page? | |
| 63 | je .indir_check # NO, goto "indir_check" | |
| 64 | lgr %r6,%r5 # r6 = r5 | |
| 65 | nill %r6,0xf000 # mask it out and... | |
| 66 | j .top # ...next iteration | |
| cf13f0ea | 67 | .indir_check: |
| 25d83cbf HC |
68 | tml %r5,0x2 # is it a indirection page? |
| 69 | je .done_test # NO, goto "done_test" | |
| 70 | nill %r5,0xf000 # YES, mask out, | |
| 71 | lgr %r2,%r5 # move it into the right register, | |
| 72 | j .top # and read next... | |
| cf13f0ea | 73 | .done_test: |
| 25d83cbf HC |
74 | tml %r5,0x4 # is it the done indicator? |
| 75 | je .source_test # NO! Well, then it should be the source indicator... | |
| 76 | j .done # ok, lets finish it here... | |
| cf13f0ea | 77 | .source_test: |
| 25d83cbf HC |
78 | tml %r5,0x8 # it should be a source indicator... |
| 79 | je .top # NO, ignore it... | |
| 80 | lgr %r8,%r5 # r8 = r5 | |
| 81 | nill %r8,0xf000 # masking | |
| 82 | 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0 | |
| cf13f0ea | 83 | jo 0b |
| 25d83cbf | 84 | j .top |
| cf13f0ea | 85 | .done: |
| 25d83cbf HC |
86 | sgr %r0,%r0 # clear register r0 |
| 87 | la %r4,load_psw-.base(%r13) # load psw-address into the register | |
| 88 | o %r3,4(%r4) # or load address into psw | |
| cf13f0ea | 89 | st %r3,4(%r4) |
| 25d83cbf | 90 | mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0 |
| 5d3f229f HC |
91 | tm have_diag308-.base(%r13),0x01 |
| 92 | jno .no_diag308 | |
| 93 | diag %r0,%r0,0x308 | |
| 94 | .no_diag308: | |
| 25d83cbf HC |
95 | sam31 # 31 bit mode |
| 96 | sr %r1,%r1 # erase register r1 | |
| 97 | sr %r2,%r2 # erase register r2 | |
| 98 | sigp %r1,%r2,0x12 # set cpuid to zero | |
| 99 | lpsw 0 # hopefully start new kernel... | |
| cf13f0ea | 100 | |
| 25d83cbf | 101 | .align 8 |
| cf13f0ea HC |
102 | load_psw: |
| 103 | .long 0x00080000,0x80000000 | |
| 104 | sys_msk: | |
| 105 | .quad 0 | |
| 5d3f229f HC |
106 | ctlregs: |
| 107 | .rept 16 | |
| 108 | .quad 0 | |
| 109 | .endr | |
| 110 | gprregs: | |
| 111 | .rept 16 | |
| 112 | .quad 0 | |
| 113 | .endr | |
| 114 | have_diag308: | |
| 115 | .byte 0 | |
| 116 | .align 8 | |
| cf13f0ea HC |
117 | relocate_kernel_end: |
| 118 | .globl relocate_kernel_len | |
| 119 | relocate_kernel_len: | |
| 120 | .quad relocate_kernel_end - relocate_kernel |