| Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * arch/s390/kernel/relocate_kernel64.S |
| 3 | * |
| 4 | * (C) Copyright IBM Corp. 2005 |
| 5 | * |
| 6 | * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com> |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | /* |
| 11 | * moves the new kernel to its destination... |
| 12 | * %r2 = pointer to first kimage_entry_t |
| 13 | * %r3 = start address - where to jump to after the job is done... |
| 14 | * |
| 15 | * %r5 will be used as temp. storage |
| 16 | * %r6 holds the destination address |
| 17 | * %r7 = PAGE_SIZE |
| 18 | * %r8 holds the source address |
| 19 | * %r9 = PAGE_SIZE |
| 20 | * |
| 21 | * 0xf000 is a page_mask |
| 22 | */ |
| 23 | |
| 24 | .text |
| 25 | .globl relocate_kernel |
| 26 | relocate_kernel: |
| 27 | basr %r13,0 #base address |
| 28 | .base: |
| 29 | spx zero64-.base(%r13) #absolute addressing mode |
| 30 | stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQ (external) |
| 31 | .top: |
| 32 | lghi %r7,4096 #load PAGE_SIZE in r7 |
| 33 | lghi %r9,4096 #load PAGE_SIZE in r9 |
| 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... |
| 40 | j .top #...next iteration |
| 41 | .indir_check: |
| 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, |
| 46 | j .top #and read next... |
| 47 | .done_test: |
| 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... |
| 51 | .source_test: |
| 52 | tml %r5,0x8 #it should be a source indicator... |
| 53 | je .top #NO, ignore it... |
| 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 |
| 57 | jo 0b |
| 58 | j .top |
| 59 | .done: |
| 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 |
| 63 | st %r3,4(%r4) |
| 64 | mvc 0(8,%r0),0(%r4) #copy psw to absolute address 0 |
| 65 | sam31 #31 bit mode |
| 66 | sr %r1,%r1 #erase register r1 |
| 67 | sr %r2,%r2 #erase register r2 |
| 68 | sigp %r1,%r2,0x12 #set cpuid to zero |
| 69 | lpsw 0 #hopefully start new kernel... |
| 70 | |
| 71 | .align 8 |
| 72 | zero64: |
| 73 | .quad 0 |
| 74 | load_psw: |
| 75 | .long 0x00080000,0x80000000 |
| 76 | sys_msk: |
| 77 | .quad 0 |
| 78 | relocate_kernel_end: |
| 79 | .globl relocate_kernel_len |
| 80 | relocate_kernel_len: |
| 81 | .quad relocate_kernel_end - relocate_kernel |
| 82 | |