354 lines
7.9 KiB
ArmAsm
354 lines
7.9 KiB
ArmAsm
/*
|
|
* Mini SCLP driver.
|
|
*
|
|
* Copyright IBM Corp. 2004,2009
|
|
*
|
|
* Author(s): Peter Oberparleiter <Peter.Oberparleiter@de.ibm.com>,
|
|
* Heiko Carstens <heiko.carstens@de.ibm.com>,
|
|
*
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
LC_EXT_NEW_PSW = 0x58 # addr of ext int handler
|
|
LC_EXT_NEW_PSW_64 = 0x1b0 # addr of ext int handler 64 bit
|
|
LC_EXT_INT_PARAM = 0x80 # addr of ext int parameter
|
|
LC_EXT_INT_CODE = 0x86 # addr of ext int code
|
|
LC_AR_MODE_ID = 0xa3
|
|
|
|
#
|
|
# Subroutine which waits synchronously until either an external interruption
|
|
# or a timeout occurs.
|
|
#
|
|
# Parameters:
|
|
# R2 = 0 for no timeout, non-zero for timeout in (approximated) seconds
|
|
#
|
|
# Returns:
|
|
# R2 = 0 on interrupt, 2 on timeout
|
|
# R3 = external interruption parameter if R2=0
|
|
#
|
|
|
|
_sclp_wait_int:
|
|
stm %r6,%r15,24(%r15) # save registers
|
|
basr %r13,0 # get base register
|
|
.LbaseS1:
|
|
ahi %r15,-96 # create stack frame
|
|
la %r8,LC_EXT_NEW_PSW # register int handler
|
|
la %r9,.LextpswS1-.LbaseS1(%r13)
|
|
#ifdef CONFIG_64BIT
|
|
tm LC_AR_MODE_ID,1
|
|
jno .Lesa1
|
|
la %r8,LC_EXT_NEW_PSW_64 # register int handler 64 bit
|
|
la %r9,.LextpswS1_64-.LbaseS1(%r13)
|
|
.Lesa1:
|
|
#endif
|
|
mvc .LoldpswS1-.LbaseS1(16,%r13),0(%r8)
|
|
mvc 0(16,%r8),0(%r9)
|
|
lhi %r6,0x0200 # cr mask for ext int (cr0.54)
|
|
ltr %r2,%r2
|
|
jz .LsetctS1
|
|
ahi %r6,0x0800 # cr mask for clock int (cr0.52)
|
|
stck .LtimeS1-.LbaseS1(%r13) # initiate timeout
|
|
al %r2,.LtimeS1-.LbaseS1(%r13)
|
|
st %r2,.LtimeS1-.LbaseS1(%r13)
|
|
sckc .LtimeS1-.LbaseS1(%r13)
|
|
|
|
.LsetctS1:
|
|
stctl %c0,%c0,.LctlS1-.LbaseS1(%r13) # enable required interrupts
|
|
l %r0,.LctlS1-.LbaseS1(%r13)
|
|
lhi %r1,~(0x200 | 0x800) # clear old values
|
|
nr %r1,%r0
|
|
or %r1,%r6 # set new value
|
|
st %r1,.LctlS1-.LbaseS1(%r13)
|
|
lctl %c0,%c0,.LctlS1-.LbaseS1(%r13)
|
|
st %r0,.LctlS1-.LbaseS1(%r13)
|
|
lhi %r2,2 # return code for timeout
|
|
.LloopS1:
|
|
lpsw .LwaitpswS1-.LbaseS1(%r13) # wait until interrupt
|
|
.LwaitS1:
|
|
lh %r7,LC_EXT_INT_CODE
|
|
chi %r7,0x1004 # timeout?
|
|
je .LtimeoutS1
|
|
chi %r7,0x2401 # service int?
|
|
jne .LloopS1
|
|
sr %r2,%r2
|
|
l %r3,LC_EXT_INT_PARAM
|
|
.LtimeoutS1:
|
|
lctl %c0,%c0,.LctlS1-.LbaseS1(%r13) # restore interrupt setting
|
|
# restore old handler
|
|
mvc 0(16,%r8),.LoldpswS1-.LbaseS1(%r13)
|
|
lm %r6,%r15,120(%r15) # restore registers
|
|
br %r14 # return to caller
|
|
|
|
.align 8
|
|
.LoldpswS1:
|
|
.long 0, 0, 0, 0 # old ext int PSW
|
|
.LextpswS1:
|
|
.long 0x00080000, 0x80000000+.LwaitS1 # PSW to handle ext int
|
|
#ifdef CONFIG_64BIT
|
|
.LextpswS1_64:
|
|
.quad 0x0000000180000000, .LwaitS1 # PSW to handle ext int, 64 bit
|
|
#endif
|
|
.LwaitpswS1:
|
|
.long 0x010a0000, 0x00000000+.LloopS1 # PSW to wait for ext int
|
|
.LtimeS1:
|
|
.quad 0 # current time
|
|
.LctlS1:
|
|
.long 0 # CT0 contents
|
|
|
|
#
|
|
# Subroutine to synchronously issue a service call.
|
|
#
|
|
# Parameters:
|
|
# R2 = command word
|
|
# R3 = sccb address
|
|
#
|
|
# Returns:
|
|
# R2 = 0 on success, 1 on failure
|
|
# R3 = sccb response code if R2 = 0
|
|
#
|
|
|
|
_sclp_servc:
|
|
stm %r6,%r15,24(%r15) # save registers
|
|
ahi %r15,-96 # create stack frame
|
|
lr %r6,%r2 # save command word
|
|
lr %r7,%r3 # save sccb address
|
|
.LretryS2:
|
|
lhi %r2,1 # error return code
|
|
.insn rre,0xb2200000,%r6,%r7 # servc
|
|
brc 1,.LendS2 # exit if not operational
|
|
brc 8,.LnotbusyS2 # go on if not busy
|
|
sr %r2,%r2 # wait until no longer busy
|
|
bras %r14,_sclp_wait_int
|
|
j .LretryS2 # retry
|
|
.LnotbusyS2:
|
|
sr %r2,%r2 # wait until result
|
|
bras %r14,_sclp_wait_int
|
|
sr %r2,%r2
|
|
lh %r3,6(%r7)
|
|
.LendS2:
|
|
lm %r6,%r15,120(%r15) # restore registers
|
|
br %r14
|
|
|
|
#
|
|
# Subroutine to set up the SCLP interface.
|
|
#
|
|
# Parameters:
|
|
# R2 = 0 to activate, non-zero to deactivate
|
|
#
|
|
# Returns:
|
|
# R2 = 0 on success, non-zero on failure
|
|
#
|
|
|
|
_sclp_setup:
|
|
stm %r6,%r15,24(%r15) # save registers
|
|
ahi %r15,-96 # create stack frame
|
|
basr %r13,0 # get base register
|
|
.LbaseS3:
|
|
l %r6,.LsccbS0-.LbaseS3(%r13) # prepare init mask sccb
|
|
mvc 0(.LinitendS3-.LinitsccbS3,%r6),.LinitsccbS3-.LbaseS3(%r13)
|
|
ltr %r2,%r2 # initialization?
|
|
jz .LdoinitS3 # go ahead
|
|
# clear masks
|
|
xc .LinitmaskS3-.LinitsccbS3(8,%r6),.LinitmaskS3-.LinitsccbS3(%r6)
|
|
.LdoinitS3:
|
|
l %r2,.LwritemaskS3-.LbaseS3(%r13)# get command word
|
|
lr %r3,%r6 # get sccb address
|
|
bras %r14,_sclp_servc # issue service call
|
|
ltr %r2,%r2 # servc successful?
|
|
jnz .LerrorS3
|
|
chi %r3,0x20 # write mask successful?
|
|
jne .LerrorS3
|
|
# check masks
|
|
la %r2,.LinitmaskS3-.LinitsccbS3(%r6)
|
|
l %r1,0(%r2) # receive mask ok?
|
|
n %r1,12(%r2)
|
|
cl %r1,0(%r2)
|
|
jne .LerrorS3
|
|
l %r1,4(%r2) # send mask ok?
|
|
n %r1,8(%r2)
|
|
cl %r1,4(%r2)
|
|
sr %r2,%r2
|
|
je .LendS3
|
|
.LerrorS3:
|
|
lhi %r2,1 # error return code
|
|
.LendS3:
|
|
lm %r6,%r15,120(%r15) # restore registers
|
|
br %r14
|
|
.LwritemaskS3:
|
|
.long 0x00780005 # SCLP command for write mask
|
|
.LinitsccbS3:
|
|
.word .LinitendS3-.LinitsccbS3
|
|
.byte 0,0,0,0
|
|
.word 0
|
|
.word 0
|
|
.word 4
|
|
.LinitmaskS3:
|
|
.long 0x80000000
|
|
.long 0x40000000
|
|
.long 0
|
|
.long 0
|
|
.LinitendS3:
|
|
|
|
#
|
|
# Subroutine which prints a given text to the SCLP console.
|
|
#
|
|
# Parameters:
|
|
# R2 = address of nil-terminated ASCII text
|
|
#
|
|
# Returns:
|
|
# R2 = 0 on success, 1 on failure
|
|
#
|
|
|
|
_sclp_print:
|
|
stm %r6,%r15,24(%r15) # save registers
|
|
ahi %r15,-96 # create stack frame
|
|
basr %r13,0 # get base register
|
|
.LbaseS4:
|
|
l %r8,.LsccbS0-.LbaseS4(%r13) # prepare write data sccb
|
|
mvc 0(.LmtoS4-.LwritesccbS4,%r8),.LwritesccbS4-.LbaseS4(%r13)
|
|
la %r7,.LmtoS4-.LwritesccbS4(%r8) # current mto addr
|
|
sr %r0,%r0
|
|
l %r10,.Lascebc-.LbaseS4(%r13) # address of translation table
|
|
.LinitmtoS4:
|
|
# initialize mto
|
|
mvc 0(.LmtoendS4-.LmtoS4,%r7),.LmtoS4-.LbaseS4(%r13)
|
|
lhi %r6,.LmtoendS4-.LmtoS4 # current mto length
|
|
.LloopS4:
|
|
ic %r0,0(%r2) # get character
|
|
ahi %r2,1
|
|
ltr %r0,%r0 # end of string?
|
|
jz .LfinalizemtoS4
|
|
chi %r0,0x15 # end of line (NL)?
|
|
jz .LfinalizemtoS4
|
|
stc %r0,0(%r6,%r7) # copy to mto
|
|
la %r11,0(%r6,%r7)
|
|
tr 0(1,%r11),0(%r10) # translate to EBCDIC
|
|
ahi %r6,1
|
|
j .LloopS4
|
|
.LfinalizemtoS4:
|
|
sth %r6,0(%r7) # update mto length
|
|
lh %r9,.LmdbS4-.LwritesccbS4(%r8) # update mdb length
|
|
ar %r9,%r6
|
|
sth %r9,.LmdbS4-.LwritesccbS4(%r8)
|
|
lh %r9,.LevbufS4-.LwritesccbS4(%r8)# update evbuf length
|
|
ar %r9,%r6
|
|
sth %r9,.LevbufS4-.LwritesccbS4(%r8)
|
|
lh %r9,0(%r8) # update sccb length
|
|
ar %r9,%r6
|
|
sth %r9,0(%r8)
|
|
ar %r7,%r6 # update current mto address
|
|
ltr %r0,%r0 # more characters?
|
|
jnz .LinitmtoS4
|
|
l %r2,.LwritedataS4-.LbaseS4(%r13)# write data
|
|
lr %r3,%r8
|
|
bras %r14,_sclp_servc
|
|
ltr %r2,%r2 # servc successful?
|
|
jnz .LendS4
|
|
chi %r3,0x20 # write data successful?
|
|
je .LendS4
|
|
lhi %r2,1 # error return code
|
|
.LendS4:
|
|
lm %r6,%r15,120(%r15) # restore registers
|
|
br %r14
|
|
|
|
#
|
|
# Function which prints a given text to the SCLP console.
|
|
#
|
|
# Parameters:
|
|
# R2 = address of nil-terminated ASCII text
|
|
#
|
|
# Returns:
|
|
# R2 = 0 on success, 1 on failure
|
|
#
|
|
|
|
ENTRY(_sclp_print_early)
|
|
stm %r6,%r15,24(%r15) # save registers
|
|
ahi %r15,-96 # create stack frame
|
|
#ifdef CONFIG_64BIT
|
|
tm LC_AR_MODE_ID,1
|
|
jno .Lesa2
|
|
ahi %r15,-80
|
|
stmh %r6,%r15,96(%r15) # store upper register halves
|
|
.Lesa2:
|
|
#endif
|
|
lr %r10,%r2 # save string pointer
|
|
lhi %r2,0
|
|
bras %r14,_sclp_setup # enable console
|
|
ltr %r2,%r2
|
|
jnz .LendS5
|
|
lr %r2,%r10
|
|
bras %r14,_sclp_print # print string
|
|
ltr %r2,%r2
|
|
jnz .LendS5
|
|
lhi %r2,1
|
|
bras %r14,_sclp_setup # disable console
|
|
.LendS5:
|
|
#ifdef CONFIG_64BIT
|
|
tm LC_AR_MODE_ID,1
|
|
jno .Lesa3
|
|
lmh %r6,%r15,96(%r15) # store upper register halves
|
|
ahi %r15,80
|
|
.Lesa3:
|
|
#endif
|
|
lm %r6,%r15,120(%r15) # restore registers
|
|
br %r14
|
|
|
|
.LwritedataS4:
|
|
.long 0x00760005 # SCLP command for write data
|
|
.LwritesccbS4:
|
|
# sccb
|
|
.word .LmtoS4-.LwritesccbS4
|
|
.byte 0
|
|
.byte 0,0,0
|
|
.word 0
|
|
|
|
# evbuf
|
|
.LevbufS4:
|
|
.word .LmtoS4-.LevbufS4
|
|
.byte 0x02
|
|
.byte 0
|
|
.word 0
|
|
|
|
.LmdbS4:
|
|
# mdb
|
|
.word .LmtoS4-.LmdbS4
|
|
.word 1
|
|
.long 0xd4c4c240
|
|
.long 1
|
|
|
|
# go
|
|
.LgoS4:
|
|
.word .LmtoS4-.LgoS4
|
|
.word 1
|
|
.long 0
|
|
.byte 0,0,0,0,0,0,0,0
|
|
.byte 0,0,0
|
|
.byte 0
|
|
.byte 0,0,0,0,0,0,0
|
|
.byte 0
|
|
.word 0
|
|
.byte 0,0,0,0,0,0,0,0,0,0
|
|
.byte 0,0,0,0,0,0,0,0
|
|
.byte 0,0,0,0,0,0,0,0
|
|
|
|
.LmtoS4:
|
|
.word .LmtoendS4-.LmtoS4
|
|
.word 4
|
|
.word 0x1000
|
|
.byte 0
|
|
.byte 0,0,0
|
|
.LmtoendS4:
|
|
|
|
# Global constants
|
|
.LsccbS0:
|
|
.long _sclp_work_area
|
|
.Lascebc:
|
|
.long _ascebc
|
|
|
|
.section .data,"aw",@progbits
|
|
.balign 4096
|
|
_sclp_work_area:
|
|
.fill 4096
|
|
.previous
|