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