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- /*
- * Copyright IBM Corp. 2005
- *
- * Author(s): Rolf Adelsberger,
- * Heiko Carstens <heiko.carstens@de.ibm.com>
- *
- */
- #include <linux/linkage.h>
- #include <asm/sigp.h>
- /*
- * 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
- ENTRY(relocate_kernel)
- basr %r13,0 # base address
- .base:
- stnsm sys_msk-.base(%r13),0xfb # disable DAT
- stctl %c0,%c15,ctlregs-.base(%r13)
- stm %r0,%r15,gprregs-.base(%r13)
- 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
- mvc 0x68(8,%r0),0(%r1)
- la %r0,.back_pgm-.base(%r13)
- st %r0,0x6c(%r0)
- oi 0x6c(%r0),0x80
- lhi %r0,0
- diag %r0,%r0,0x308
- .back:
- basr %r13,0
- .back_base:
- oi have_diag308-.back_base(%r13),0x01
- lctl %c0,%c15,ctlregs-.back_base(%r13)
- lm %r0,%r15,gprregs-.back_base(%r13)
- j .start_reloc
- .back_pgm:
- lm %r0,%r15,gprregs-.base(%r13)
- .start_reloc:
- 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
- tm have_diag308-.base(%r13),0x01
- jno .no_diag308
- diag %r0,%r0,0x308
- .no_diag308:
- sr %r1,%r1 # clear %r1
- sr %r2,%r2 # clear %r2
- sigp %r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero
- lpsw 0 # hopefully start new kernel...
- .align 8
- load_psw:
- .long 0x00080000,0x80000000
- sys_msk:
- .quad 0
- ctlregs:
- .rept 16
- .long 0
- .endr
- gprregs:
- .rept 16
- .long 0
- .endr
- have_diag308:
- .byte 0
- .align 8
- relocate_kernel_end:
- .align 8
- .globl relocate_kernel_len
- relocate_kernel_len:
- .quad relocate_kernel_end - relocate_kernel
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