diff options
| -rw-r--r-- | arch/s390/kernel/head.S | 59 | ||||
| -rw-r--r-- | arch/s390/kernel/head31.S | 43 | ||||
| -rw-r--r-- | arch/s390/kernel/head64.S | 39 | ||||
| -rw-r--r-- | arch/s390/kernel/ipl.c | 4 | ||||
| -rw-r--r-- | drivers/s390/cio/cio.c | 38 | ||||
| -rw-r--r-- | include/asm-s390/lowcore.h | 1 | ||||
| -rw-r--r-- | include/asm-s390/setup.h | 8 |
7 files changed, 99 insertions, 93 deletions
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S index a6e9bdb5359..0f1db268a8a 100644 --- a/arch/s390/kernel/head.S +++ b/arch/s390/kernel/head.S @@ -481,65 +481,6 @@ start: .byte 0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7 .byte 0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff -.macro GET_IPL_DEVICE -.Lget_ipl_device: - l %r1,0xb8 # get sid - sll %r1,15 # test if subchannel is enabled - srl %r1,31 - ltr %r1,%r1 - bz 2f-.LPG1(%r13) # subchannel disabled - l %r1,0xb8 - la %r5,.Lipl_schib-.LPG1(%r13) - stsch 0(%r5) # get schib of subchannel - bnz 2f-.LPG1(%r13) # schib not available - tm 5(%r5),0x01 # devno valid? - bno 2f-.LPG1(%r13) - la %r6,ipl_parameter_flags-.LPG1(%r13) - oi 3(%r6),0x01 # set flag - la %r2,ipl_devno-.LPG1(%r13) - mvc 0(2,%r2),6(%r5) # store devno - tm 4(%r5),0x80 # qdio capable device? - bno 2f-.LPG1(%r13) - oi 3(%r6),0x02 # set flag - - # copy ipl parameters - - lhi %r0,4096 - l %r2,20(%r0) # get address of parameter list - lhi %r3,IPL_PARMBLOCK_ORIGIN - st %r3,20(%r0) - lhi %r4,1 - cr %r2,%r3 # start parameters < destination ? - jl 0f - lhi %r1,1 # copy direction is upwards - j 1f -0: lhi %r1,-1 # copy direction is downwards - ar %r2,%r0 - ar %r3,%r0 - ar %r2,%r1 - ar %r3,%r1 -1: mvc 0(1,%r3),0(%r2) # finally copy ipl parameters - ar %r3,%r1 - ar %r2,%r1 - sr %r0,%r4 - jne 1b - b 2f-.LPG1(%r13) - - .align 4 -.Lipl_schib: - .rept 13 - .long 0 - .endr - - .globl ipl_parameter_flags -ipl_parameter_flags: - .long 0 - .globl ipl_devno -ipl_devno: - .word 0 -2: -.endm - #ifdef CONFIG_64BIT #include "head64.S" #else diff --git a/arch/s390/kernel/head31.S b/arch/s390/kernel/head31.S index d8bb68a7252..1fa9fa1ca74 100644 --- a/arch/s390/kernel/head31.S +++ b/arch/s390/kernel/head31.S @@ -37,13 +37,23 @@ startup:basr %r13,0 # get base startup_continue: basr %r13,0 # get base -.LPG1: GET_IPL_DEVICE - mvi __LC_AR_MODE_ID,0 # set ESA flag (mode 0) +.LPG1: mvi __LC_AR_MODE_ID,0 # set ESA flag (mode 0) lctl %c0,%c15,.Lctl-.LPG1(%r13) # load control registers l %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area # move IPL device to lowcore mvc __LC_IPLDEV(4),IPL_DEVICE-PARMAREA(%r12) +# +# Setup stack +# + l %r15,.Linittu-.LPG1(%r13) + mvc __LC_CURRENT(4),__TI_task(%r15) + ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE + st %r15,__LC_KERNEL_STACK # set end of kernel stack + ahi %r15,-96 + xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain + l %r14,.Lipl_save_parameters-.LPG1(%r13) + basr %r14,%r14 # # clear bss memory # @@ -115,6 +125,10 @@ startup_continue: b .Lfchunk-.LPG1(%r13) .align 4 +.Lipl_save_parameters: + .long ipl_save_parameters +.Linittu: + .long init_thread_union .Lpmask: .byte 0 .align 8 @@ -274,6 +288,20 @@ startup_continue: .Lbss_end: .long _end .Lparmaddr: .long PARMAREA .Lsccbaddr: .long .Lsccb + + .globl ipl_schib +ipl_schib: + .rept 13 + .long 0 + .endr + + .globl ipl_flags +ipl_flags: + .long 0 + .globl ipl_devno +ipl_devno: + .word 0 + .org 0x12000 .globl s390_readinfo_sccb s390_readinfo_sccb: @@ -305,16 +333,6 @@ s390_readinfo_sccb: .globl _stext _stext: basr %r13,0 # get base .LPG3: -# -# Setup stack -# - l %r15,.Linittu-.LPG3(%r13) - mvc __LC_CURRENT(4),__TI_task(%r15) - ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE - st %r15,__LC_KERNEL_STACK # set end of kernel stack - ahi %r15,-96 - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain - # check control registers stctl %c0,%c15,0(%r15) oi 2(%r15),0x40 # enable sigp emergency signal @@ -333,6 +351,5 @@ _stext: basr %r13,0 # get base # .align 8 .Ldw: .long 0x000a0000,0x00000000 -.Linittu:.long init_thread_union .Lstart:.long start_kernel .Laregs:.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S index c2005101fee..1ebaa338aa7 100644 --- a/arch/s390/kernel/head64.S +++ b/arch/s390/kernel/head64.S @@ -39,7 +39,6 @@ startup_continue: basr %r13,0 # get base .LPG1: sll %r13,1 # remove high order bit srl %r13,1 - GET_IPL_DEVICE lhi %r1,1 # mode 1 = esame mvi __LC_AR_MODE_ID,1 # set esame flag slr %r0,%r0 # set cpuid to zero @@ -49,7 +48,18 @@ startup_continue: lg %r12,.Lparmaddr-.LPG1(%r13)# pointer to parameter area # move IPL device to lowcore mvc __LC_IPLDEV(4),IPL_DEVICE+4-PARMAREA(%r12) +# +# Setup stack +# + larl %r15,init_thread_union + lg %r14,__TI_task(%r15) # cache current in lowcore + stg %r14,__LC_CURRENT + aghi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE + stg %r15,__LC_KERNEL_STACK # set end of kernel stack + aghi %r15,-160 + xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain + brasl %r14,ipl_save_parameters # # clear bss memory # @@ -269,6 +279,19 @@ startup_continue: .Lparmaddr: .quad PARMAREA + .globl ipl_schib +ipl_schib: + .rept 13 + .long 0 + .endr + + .globl ipl_flags +ipl_flags: + .long 0 + .globl ipl_devno +ipl_devno: + .word 0 + .org 0x12000 .globl s390_readinfo_sccb s390_readinfo_sccb: @@ -300,24 +323,12 @@ s390_readinfo_sccb: .globl _stext _stext: basr %r13,0 # get base .LPG3: -# -# Setup stack -# - larl %r15,init_thread_union - lg %r14,__TI_task(%r15) # cache current in lowcore - stg %r14,__LC_CURRENT - aghi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE - stg %r15,__LC_KERNEL_STACK # set end of kernel stack - aghi %r15,-160 - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain - # check control registers stctg %c0,%c15,0(%r15) oi 6(%r15),0x40 # enable sigp emergency signal oi 4(%r15),0x10 # switch on low address proctection lctlg %c0,%c15,0(%r15) -# lam 0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess brasl %r14,start_kernel # go to C code # @@ -325,7 +336,7 @@ _stext: basr %r13,0 # get base # basr %r13,0 lpswe .Ldw-.(%r13) # load disabled wait psw -# + .align 8 .Ldw: .quad 0x0002000180000000,0x0000000000000000 .Laregs: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index 105ee15a2b3..6555cc48e28 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -189,9 +189,9 @@ static enum ipl_type ipl_get_type(void) { struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START; - if (!IPL_DEVNO_VALID) + if (!(ipl_flags & IPL_DEVNO_VALID)) return IPL_TYPE_UNKNOWN; - if (!IPL_PARMBLOCK_VALID) + if (!(ipl_flags & IPL_PARMBLOCK_VALID)) return IPL_TYPE_CCW; if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION) return IPL_TYPE_UNKNOWN; diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c index 050963f1580..61eb7caa156 100644 --- a/drivers/s390/cio/cio.c +++ b/drivers/s390/cio/cio.c @@ -16,11 +16,10 @@ #include <linux/device.h> #include <linux/kernel_stat.h> #include <linux/interrupt.h> - #include <asm/cio.h> #include <asm/delay.h> #include <asm/irq.h> - +#include <asm/setup.h> #include "airq.h" #include "cio.h" #include "css.h" @@ -909,3 +908,38 @@ void reipl_ccw_dev(struct ccw_dev_id *devid) cio_reset_channel_paths(); do_reipl_asm(*((__u32*)&schid)); } + +extern struct schib ipl_schib; + +/* + * ipl_save_parameters gets called very early. It is not allowed to access + * anything in the bss section at all. The bss section is not cleared yet, + * but may contain some ipl parameters written by the firmware. + * These parameters (if present) are copied to 0x2000. + * To avoid corruption of the ipl parameters, all variables used by this + * function must reside on the stack or in the data section. + */ +void ipl_save_parameters(void) +{ + struct subchannel_id schid; + unsigned int *ipl_ptr; + void *src, *dst; + + schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID; + if (!schid.one) + return; + if (stsch(schid, &ipl_schib)) + return; + if (!ipl_schib.pmcw.dnv) + return; + ipl_devno = ipl_schib.pmcw.dev; + ipl_flags |= IPL_DEVNO_VALID; + if (!ipl_schib.pmcw.qf) + return; + ipl_flags |= IPL_PARMBLOCK_VALID; + ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR; + src = (void *)(unsigned long)*ipl_ptr; + dst = (void *)IPL_PARMBLOCK_ORIGIN; + memmove(dst, src, PAGE_SIZE); + *ipl_ptr = IPL_PARMBLOCK_ORIGIN; +} diff --git a/include/asm-s390/lowcore.h b/include/asm-s390/lowcore.h index 2e3d4cca5e2..18695d10ded 100644 --- a/include/asm-s390/lowcore.h +++ b/include/asm-s390/lowcore.h @@ -35,6 +35,7 @@ #define __LC_IO_NEW_PSW 0x01f0 #endif /* !__s390x__ */ +#define __LC_IPL_PARMBLOCK_PTR 0x014 #define __LC_EXT_PARAMS 0x080 #define __LC_CPU_ADDRESS 0x084 #define __LC_EXT_INT_CODE 0x086 diff --git a/include/asm-s390/setup.h b/include/asm-s390/setup.h index 4a1126d8439..00c03e46689 100644 --- a/include/asm-s390/setup.h +++ b/include/asm-s390/setup.h @@ -125,13 +125,15 @@ struct ipl_parameter_block { /* * IPL validity flags and parameters as detected in head.S */ -extern u32 ipl_parameter_flags; +extern u32 ipl_flags; extern u16 ipl_devno; void do_reipl(void); -#define IPL_DEVNO_VALID (ipl_parameter_flags & 1) -#define IPL_PARMBLOCK_VALID (ipl_parameter_flags & 2) +enum { + IPL_DEVNO_VALID = 1, + IPL_PARMBLOCK_VALID = 2, +}; #define IPL_PARMBLOCK_START ((struct ipl_parameter_block *) \ IPL_PARMBLOCK_ORIGIN) |