diff options
Diffstat (limited to 'arch/s390/kernel/relocate_kernel.S')
| -rw-r--r-- | arch/s390/kernel/relocate_kernel.S | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/arch/s390/kernel/relocate_kernel.S b/arch/s390/kernel/relocate_kernel.S new file mode 100644 index 0000000..d5e4a62 --- /dev/null +++ b/arch/s390/kernel/relocate_kernel.S @@ -0,0 +1,81 @@ +/* + * arch/s390/kernel/relocate_kernel.S + * + * (C) Copyright IBM Corp. 2005 + * + * Author(s): Rolf Adelsberger <adelsberger@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 + * %r10 is a page mask + */ + + .text + .globl relocate_kernel + relocate_kernel: + basr %r13,0 #base address + .base: + spx zero64-.base(%r13) #absolute addressing mode + stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQ (external) + lhi %r10,-1 #preparing the mask + sll %r10,12 #shift it such that it becomes 0xf000 + .top: + lhi %r7,4096 #load PAGE_SIZE in r7 + lhi %r9,4096 #load PAGE_SIZE in r9 + l %r5,0(%r2) #read another word for indirection page + ahi %r2,4 #increment pointer + tml %r5,0x1 #is it a destination page? + je .indir_check #NO, goto "indir_check" + lr %r6,%r5 #r6 = r5 + nr %r6,%r10 #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" + nr %r5,%r10 #YES, mask out, + lr %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... + lr %r8,%r5 #r8 = r5 + nr %r8,%r10 #masking + 0: mvcle %r6,%r8,0x0 #copy PAGE_SIZE bytes from r8 to r6 - pad with 0 + jo 0b + j .top + .done: + sr %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 + sr %r1,%r1 #clear %r1 + sr %r2,%r2 #clear %r2 + sigp %r1,%r2,0x12 #set cpuid to zero + lpsw 0 #hopefully start new kernel... + + .align 8 + zero64: + .quad 0 + load_psw: + .long 0x00080000,0x80000000 + sys_msk: + .quad 0 + relocate_kernel_end: + .globl relocate_kernel_len + relocate_kernel_len: + .quad relocate_kernel_end - relocate_kernel |
