8e9e9844b4
Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
303 lines
7.6 KiB
ArmAsm
303 lines
7.6 KiB
ArmAsm
/*
|
|
* HPMC (High Priority Machine Check) handler.
|
|
*
|
|
* Copyright (C) 1999 Philipp Rumpf <prumpf@tux.org>
|
|
* Copyright (C) 1999 Hewlett-Packard (Frank Rowand)
|
|
* Copyright (C) 2000 Hewlett-Packard (John Marvin)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
|
|
/*
|
|
* This HPMC handler retrieves the HPMC pim data, resets IO and
|
|
* returns to the default trap handler with code set to 1 (HPMC).
|
|
* The default trap handler calls handle interruption, which
|
|
* does a stack and register dump. This at least allows kernel
|
|
* developers to get back to C code in virtual mode, where they
|
|
* have the option to examine and print values from memory that
|
|
* would help in debugging an HPMC caused by a software bug.
|
|
*
|
|
* There is more to do here:
|
|
*
|
|
* 1) On MP systems we need to synchronize processors
|
|
* before calling pdc/iodc.
|
|
* 2) We should be checking the system state and not
|
|
* returning to the fault handler if things are really
|
|
* bad.
|
|
*
|
|
*/
|
|
|
|
.level 1.1
|
|
.data
|
|
|
|
#include <asm/assembly.h>
|
|
#include <asm/pdc.h>
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
/*
|
|
* stack for os_hpmc, the HPMC handler.
|
|
* buffer for IODC procedures (for the HPMC handler).
|
|
*
|
|
* IODC requires 7K byte stack. That leaves 1K byte for os_hpmc.
|
|
*/
|
|
|
|
.align 4096
|
|
hpmc_stack:
|
|
.block 16384
|
|
|
|
#define HPMC_IODC_BUF_SIZE 0x8000
|
|
|
|
.align 4096
|
|
hpmc_iodc_buf:
|
|
.block HPMC_IODC_BUF_SIZE
|
|
|
|
.align 8
|
|
hpmc_raddr:
|
|
.block 128
|
|
|
|
#define HPMC_PIM_DATA_SIZE 896 /* Enough to hold all architected 2.0 state */
|
|
|
|
.align 8
|
|
ENTRY(hpmc_pim_data)
|
|
.block HPMC_PIM_DATA_SIZE
|
|
END(hpmc_pim_data)
|
|
|
|
.text
|
|
|
|
.import intr_save, code
|
|
ENTRY(os_hpmc)
|
|
|
|
/*
|
|
* registers modified:
|
|
*
|
|
* Using callee saves registers without saving them. The
|
|
* original values are in the pim dump if we need them.
|
|
*
|
|
* r2 (rp) return pointer
|
|
* r3 address of PDCE_PROC
|
|
* r4 scratch
|
|
* r5 scratch
|
|
* r23 (arg3) procedure arg
|
|
* r24 (arg2) procedure arg
|
|
* r25 (arg1) procedure arg
|
|
* r26 (arg0) procedure arg
|
|
* r30 (sp) stack pointer
|
|
*
|
|
* registers read:
|
|
*
|
|
* r26 contains address of PDCE_PROC on entry
|
|
* r28 (ret0) return value from procedure
|
|
*/
|
|
|
|
copy arg0, %r3 /* save address of PDCE_PROC */
|
|
|
|
/*
|
|
* disable nested HPMCs
|
|
*
|
|
* Increment os_hpmc checksum to invalidate it.
|
|
* Do this before turning the PSW M bit off.
|
|
*/
|
|
|
|
mfctl %cr14, %r4
|
|
ldw 52(%r4),%r5
|
|
addi 1,%r5,%r5
|
|
stw %r5,52(%r4)
|
|
|
|
/* MP_FIXME: synchronize all processors. */
|
|
|
|
/* Setup stack pointer. */
|
|
|
|
load32 PA(hpmc_stack),sp
|
|
|
|
ldo 128(sp),sp /* leave room for arguments */
|
|
|
|
/*
|
|
* Most PDC routines require that the M bit be off.
|
|
* So turn on the Q bit and turn off the M bit.
|
|
*/
|
|
|
|
ldo 8(%r0),%r4 /* PSW Q on, PSW M off */
|
|
mtctl %r4,ipsw
|
|
mtctl %r0,pcsq
|
|
mtctl %r0,pcsq
|
|
load32 PA(os_hpmc_1),%r4
|
|
mtctl %r4,pcoq
|
|
ldo 4(%r4),%r4
|
|
mtctl %r4,pcoq
|
|
rfi
|
|
nop
|
|
|
|
os_hpmc_1:
|
|
|
|
/* Call PDC_PIM to get HPMC pim info */
|
|
|
|
/*
|
|
* Note that on some newer boxes, PDC_PIM must be called
|
|
* before PDC_IO if you want IO to be reset. PDC_PIM sets
|
|
* a flag that PDC_IO examines.
|
|
*/
|
|
|
|
ldo PDC_PIM(%r0), arg0
|
|
ldo PDC_PIM_HPMC(%r0),arg1 /* Transfer HPMC data */
|
|
load32 PA(hpmc_raddr),arg2
|
|
load32 PA(hpmc_pim_data),arg3
|
|
load32 HPMC_PIM_DATA_SIZE,%r4
|
|
stw %r4,-52(sp)
|
|
|
|
ldil L%PA(os_hpmc_2), rp
|
|
bv (r3) /* call pdce_proc */
|
|
ldo R%PA(os_hpmc_2)(rp), rp
|
|
|
|
os_hpmc_2:
|
|
comib,<> 0,ret0, os_hpmc_fail
|
|
|
|
/* Reset IO by calling the hversion dependent PDC_IO routine */
|
|
|
|
ldo PDC_IO(%r0),arg0
|
|
ldo 0(%r0),arg1 /* log IO errors */
|
|
ldo 0(%r0),arg2 /* reserved */
|
|
ldo 0(%r0),arg3 /* reserved */
|
|
stw %r0,-52(sp) /* reserved */
|
|
|
|
ldil L%PA(os_hpmc_3),rp
|
|
bv (%r3) /* call pdce_proc */
|
|
ldo R%PA(os_hpmc_3)(rp),rp
|
|
|
|
os_hpmc_3:
|
|
|
|
/* FIXME? Check for errors from PDC_IO (-1 might be OK) */
|
|
|
|
/*
|
|
* Initialize the IODC console device (HPA,SPA, path etc.
|
|
* are stored on page 0.
|
|
*/
|
|
|
|
/*
|
|
* Load IODC into hpmc_iodc_buf by calling PDC_IODC.
|
|
* Note that PDC_IODC handles flushing the appropriate
|
|
* data and instruction cache lines.
|
|
*/
|
|
|
|
ldo PDC_IODC(%r0),arg0
|
|
ldo PDC_IODC_READ(%r0),arg1
|
|
load32 PA(hpmc_raddr),arg2
|
|
ldw BOOT_CONSOLE_HPA_OFFSET(%r0),arg3 /* console hpa */
|
|
ldo PDC_IODC_RI_INIT(%r0),%r4
|
|
stw %r4,-52(sp)
|
|
load32 PA(hpmc_iodc_buf),%r4
|
|
stw %r4,-56(sp)
|
|
load32 HPMC_IODC_BUF_SIZE,%r4
|
|
stw %r4,-60(sp)
|
|
|
|
ldil L%PA(os_hpmc_4),rp
|
|
bv (%r3) /* call pdce_proc */
|
|
ldo R%PA(os_hpmc_4)(rp),rp
|
|
|
|
os_hpmc_4:
|
|
comib,<> 0,ret0,os_hpmc_fail
|
|
|
|
/* Call the entry init (just loaded by PDC_IODC) */
|
|
|
|
ldw BOOT_CONSOLE_HPA_OFFSET(%r0),arg0 /* console hpa */
|
|
ldo ENTRY_INIT_MOD_DEV(%r0), arg1
|
|
ldw BOOT_CONSOLE_SPA_OFFSET(%r0),arg2 /* console spa */
|
|
depi 0,31,11,arg2 /* clear bits 21-31 */
|
|
ldo BOOT_CONSOLE_PATH_OFFSET(%r0),arg3 /* console path */
|
|
load32 PA(hpmc_raddr),%r4
|
|
stw %r4, -52(sp)
|
|
stw %r0, -56(sp) /* HV */
|
|
stw %r0, -60(sp) /* HV */
|
|
stw %r0, -64(sp) /* HV */
|
|
stw %r0, -68(sp) /* lang, must be zero */
|
|
|
|
load32 PA(hpmc_iodc_buf),%r5
|
|
ldil L%PA(os_hpmc_5),rp
|
|
bv (%r5)
|
|
ldo R%PA(os_hpmc_5)(rp),rp
|
|
|
|
os_hpmc_5:
|
|
comib,<> 0,ret0,os_hpmc_fail
|
|
|
|
/* Prepare to call intr_save */
|
|
|
|
/*
|
|
* Load kernel page directory (load into user also, since
|
|
* we don't intend to ever return to user land anyway)
|
|
*/
|
|
|
|
load32 PA(swapper_pg_dir),%r4
|
|
mtctl %r4,%cr24 /* Initialize kernel root pointer */
|
|
mtctl %r4,%cr25 /* Initialize user root pointer */
|
|
|
|
/* Clear sr4-sr7 */
|
|
|
|
mtsp %r0, %sr4
|
|
mtsp %r0, %sr5
|
|
mtsp %r0, %sr6
|
|
mtsp %r0, %sr7
|
|
|
|
tovirt_r1 %r30 /* make sp virtual */
|
|
|
|
rsm 8,%r0 /* Clear Q bit */
|
|
ldi 1,%r8 /* Set trap code to "1" for HPMC */
|
|
load32 PA(intr_save),%r1
|
|
be 0(%sr7,%r1)
|
|
nop
|
|
|
|
os_hpmc_fail:
|
|
|
|
/*
|
|
* Reset the system
|
|
*
|
|
* Some systems may lockup from a broadcast reset, so try the
|
|
* hversion PDC_BROADCAST_RESET() first.
|
|
* MP_FIXME: reset all processors if more than one central bus.
|
|
*/
|
|
|
|
/* PDC_BROADCAST_RESET() */
|
|
|
|
ldo PDC_BROADCAST_RESET(%r0),arg0
|
|
ldo 0(%r0),arg1 /* do reset */
|
|
|
|
ldil L%PA(os_hpmc_6),rp
|
|
bv (%r3) /* call pdce_proc */
|
|
ldo R%PA(os_hpmc_6)(rp),rp
|
|
|
|
os_hpmc_6:
|
|
|
|
/*
|
|
* possible return values:
|
|
* -1 non-existent procedure
|
|
* -2 non-existent option
|
|
* -16 unaligned stack
|
|
*
|
|
* If call returned, do a broadcast reset.
|
|
*/
|
|
|
|
ldil L%0xfffc0000,%r4 /* IO_BROADCAST */
|
|
ldo 5(%r0),%r5
|
|
stw %r5,48(%r4) /* CMD_RESET to IO_COMMAND offset */
|
|
|
|
b .
|
|
nop
|
|
ENDPROC(os_hpmc)
|
|
|
|
/* this label used to compute os_hpmc checksum */
|
|
ENTRY(os_hpmc_end)
|
|
|
|
nop
|