118 lines
2.9 KiB
ArmAsm
118 lines
2.9 KiB
ArmAsm
/*
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* arch/s390/kernel/relocate_kernel.S
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*
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* (C) Copyright IBM Corp. 2005
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*
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* Author(s): Rolf Adelsberger,
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* Heiko Carstens <heiko.carstens@de.ibm.com>
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*
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*/
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/*
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* moves the new kernel to its destination...
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* %r2 = pointer to first kimage_entry_t
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* %r3 = start address - where to jump to after the job is done...
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*
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* %r5 will be used as temp. storage
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* %r6 holds the destination address
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* %r7 = PAGE_SIZE
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* %r8 holds the source address
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* %r9 = PAGE_SIZE
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* %r10 is a page mask
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*/
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.text
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.globl relocate_kernel
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relocate_kernel:
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basr %r13,0 # base address
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.base:
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stnsm sys_msk-.base(%r13),0xfb # disable DAT
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stctl %c0,%c15,ctlregs-.base(%r13)
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stm %r0,%r15,gprregs-.base(%r13)
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la %r1,load_psw-.base(%r13)
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mvc 0(8,%r0),0(%r1)
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la %r0,.back-.base(%r13)
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st %r0,4(%r0)
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oi 4(%r0),0x80
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mvc 0x68(8,%r0),0(%r1)
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la %r0,.back_pgm-.base(%r13)
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st %r0,0x6c(%r0)
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oi 0x6c(%r0),0x80
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lhi %r0,0
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diag %r0,%r0,0x308
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.back:
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basr %r13,0
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.back_base:
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oi have_diag308-.back_base(%r13),0x01
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lctl %c0,%c15,ctlregs-.back_base(%r13)
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lm %r0,%r15,gprregs-.back_base(%r13)
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j .start_reloc
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.back_pgm:
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lm %r0,%r15,gprregs-.base(%r13)
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.start_reloc:
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lhi %r10,-1 # preparing the mask
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sll %r10,12 # shift it such that it becomes 0xf000
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.top:
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lhi %r7,4096 # load PAGE_SIZE in r7
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lhi %r9,4096 # load PAGE_SIZE in r9
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l %r5,0(%r2) # read another word for indirection page
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ahi %r2,4 # increment pointer
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tml %r5,0x1 # is it a destination page?
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je .indir_check # NO, goto "indir_check"
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lr %r6,%r5 # r6 = r5
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nr %r6,%r10 # mask it out and...
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j .top # ...next iteration
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.indir_check:
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tml %r5,0x2 # is it a indirection page?
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je .done_test # NO, goto "done_test"
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nr %r5,%r10 # YES, mask out,
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lr %r2,%r5 # move it into the right register,
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j .top # and read next...
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.done_test:
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tml %r5,0x4 # is it the done indicator?
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je .source_test # NO! Well, then it should be the source indicator...
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j .done # ok, lets finish it here...
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.source_test:
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tml %r5,0x8 # it should be a source indicator...
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je .top # NO, ignore it...
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lr %r8,%r5 # r8 = r5
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nr %r8,%r10 # masking
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0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0
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jo 0b
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j .top
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.done:
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sr %r0,%r0 # clear register r0
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la %r4,load_psw-.base(%r13) # load psw-address into the register
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o %r3,4(%r4) # or load address into psw
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st %r3,4(%r4)
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mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
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tm have_diag308-.base(%r13),0x01
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jno .no_diag308
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diag %r0,%r0,0x308
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.no_diag308:
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sr %r1,%r1 # clear %r1
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sr %r2,%r2 # clear %r2
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sigp %r1,%r2,0x12 # set cpuid to zero
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lpsw 0 # hopefully start new kernel...
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.align 8
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load_psw:
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.long 0x00080000,0x80000000
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sys_msk:
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.quad 0
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ctlregs:
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.rept 16
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.long 0
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.endr
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gprregs:
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.rept 16
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.long 0
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.endr
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have_diag308:
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.byte 0
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.align 8
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relocate_kernel_end:
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.globl relocate_kernel_len
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relocate_kernel_len:
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.quad relocate_kernel_end - relocate_kernel
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