mirror of https://gitee.com/openkylin/linux.git
120 lines
2.8 KiB
ArmAsm
120 lines
2.8 KiB
ArmAsm
|
/*
|
||
|
|
* S390 kdump lowlevel functions (new kernel)
|
||
|
|
*
|
||
|
|
* Copyright IBM Corp. 2011
|
||
|
|
* Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define DATAMOVER_ADDR 0x4000
|
||
|
|
#define COPY_PAGE_ADDR 0x6000
|
||
|
|
|
||
|
|
#ifdef CONFIG_CRASH_DUMP
|
||
|
|
|
||
|
|
#
|
||
|
|
# kdump entry (new kernel - not yet relocated)
|
||
|
|
#
|
||
|
|
# Note: This code has to be position independent
|
||
|
|
#
|
||
|
|
|
||
|
|
.align 2
|
||
|
|
.Lep_startup_kdump:
|
||
|
|
lhi %r1,2 # mode 2 = esame (dump)
|
||
|
|
sigp %r1,%r0,0x12 # Switch to esame mode
|
||
|
|
sam64 # Switch to 64 bit addressing
|
||
|
|
basr %r13,0
|
||
|
|
.Lbase:
|
||
|
|
larl %r2,.Lbase_addr # Check, if we have been
|
||
|
|
lg %r2,0(%r2) # already relocated:
|
||
|
|
clgr %r2,%r13 #
|
||
|
|
jne .Lrelocate # No : Start data mover
|
||
|
|
lghi %r2,0 # Yes: Start kdump kernel
|
||
|
|
brasl %r14,startup_kdump_relocated
|
||
|
|
|
||
|
|
.Lrelocate:
|
||
|
|
larl %r4,startup
|
||
|
|
lg %r2,0x418(%r4) # Get kdump base
|
||
|
|
lg %r3,0x420(%r4) # Get kdump size
|
||
|
|
|
||
|
|
larl %r10,.Lcopy_start # Source of data mover
|
||
|
|
lghi %r8,DATAMOVER_ADDR # Target of data mover
|
||
|
|
mvc 0(256,%r8),0(%r10) # Copy data mover code
|
||
|
|
|
||
|
|
agr %r8,%r2 # Copy data mover to
|
||
|
|
mvc 0(256,%r8),0(%r10) # reserved mem
|
||
|
|
|
||
|
|
lghi %r14,DATAMOVER_ADDR # Jump to copied data mover
|
||
|
|
basr %r14,%r14
|
||
|
|
.Lbase_addr:
|
||
|
|
.quad .Lbase
|
||
|
|
|
||
|
|
#
|
||
|
|
# kdump data mover code (runs at address DATAMOVER_ADDR)
|
||
|
|
#
|
||
|
|
# r2: kdump base address
|
||
|
|
# r3: kdump size
|
||
|
|
#
|
||
|
|
.Lcopy_start:
|
||
|
|
basr %r13,0 # Base
|
||
|
|
0:
|
||
|
|
lgr %r11,%r2 # Save kdump base address
|
||
|
|
lgr %r12,%r2
|
||
|
|
agr %r12,%r3 # Compute kdump end address
|
||
|
|
|
||
|
|
lghi %r5,0
|
||
|
|
lghi %r10,COPY_PAGE_ADDR # Load copy page address
|
||
|
|
1:
|
||
|
|
mvc 0(256,%r10),0(%r5) # Copy old kernel to tmp
|
||
|
|
mvc 0(256,%r5),0(%r11) # Copy new kernel to old
|
||
|
|
mvc 0(256,%r11),0(%r10) # Copy tmp to new
|
||
|
|
aghi %r11,256
|
||
|
|
aghi %r5,256
|
||
|
|
clgr %r11,%r12
|
||
|
|
jl 1b
|
||
|
|
|
||
|
|
lg %r14,.Lstartup_kdump-0b(%r13)
|
||
|
|
basr %r14,%r14 # Start relocated kernel
|
||
|
|
.Lstartup_kdump:
|
||
|
|
.long 0x00000000,0x00000000 + startup_kdump_relocated
|
||
|
|
.Lcopy_end:
|
||
|
|
|
||
|
|
#
|
||
|
|
# Startup of kdump (relocated new kernel)
|
||
|
|
#
|
||
|
|
.align 2
|
||
|
|
startup_kdump_relocated:
|
||
|
|
basr %r13,0
|
||
|
|
0:
|
||
|
|
mvc 0(8,%r0),.Lrestart_psw-0b(%r13) # Setup restart PSW
|
||
|
|
mvc 464(16,%r0),.Lpgm_psw-0b(%r13) # Setup pgm check PSW
|
||
|
|
lhi %r1,1 # Start new kernel
|
||
|
|
diag %r1,%r1,0x308 # with diag 308
|
||
|
|
|
||
|
|
.Lno_diag308: # No diag 308
|
||
|
|
sam31 # Switch to 31 bit addr mode
|
||
|
|
sr %r1,%r1 # Erase register r1
|
||
|
|
sr %r2,%r2 # Erase register r2
|
||
|
|
sigp %r1,%r2,0x12 # Switch to 31 bit arch mode
|
||
|
|
lpsw 0 # Start new kernel...
|
||
|
|
.align 8
|
||
|
|
.Lrestart_psw:
|
||
|
|
.long 0x00080000,0x80000000 + startup
|
||
|
|
.Lpgm_psw:
|
||
|
|
.quad 0x0000000180000000,0x0000000000000000 + .Lno_diag308
|
||
|
|
#else
|
||
|
|
.align 2
|
||
|
|
.Lep_startup_kdump:
|
||
|
|
#ifdef CONFIG_64BIT
|
||
|
|
larl %r13,startup_kdump_crash
|
||
|
|
lpswe 0(%r13)
|
||
|
|
.align 8
|
||
|
|
startup_kdump_crash:
|
||
|
|
.quad 0x0002000080000000,0x0000000000000000 + startup_kdump_crash
|
||
|
|
#else
|
||
|
|
basr %r13,0
|
||
|
|
0: lpsw startup_kdump_crash-0b(%r13)
|
||
|
|
.align 8
|
||
|
|
startup_kdump_crash:
|
||
|
|
.long 0x000a0000,0x00000000 + startup_kdump_crash
|
||
|
|
#endif /* CONFIG_64BIT */
|
||
|
|
#endif /* CONFIG_CRASH_DUMP */
|