/*
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2000 Hewlett Packard (Paul Bame bame@puffin.external.hp.com)
*
*/
#include <asm/psw.h>
#include <asm/assembly.h>
#include <linux/linkage.h>
#include <linux/init.h>
.section .bss
.export real_stack
.export real32_stack
.export real64_stack
.align 64
real_stack:
real32_stack:
real64_stack:
.block 8192
#ifdef CONFIG_64BIT
# define REG_SZ 8
#else
# define REG_SZ 4
#endif
#define N_SAVED_REGS 9
save_cr_space:
.block REG_SZ * N_SAVED_REGS
save_cr_end:
/************************ 32-bit real-mode calls ***********************/
/* This can be called in both narrow and wide kernels */
__HEAD
/* unsigned long real32_call_asm(unsigned int *sp,
* unsigned int *arg0p,
* unsigned int iodc_fn)
* sp is value of stack pointer to adopt before calling PDC (virt)
* arg0p points to where saved arg values may be found
* iodc_fn is the IODC function to call
*/
ENTRY(real32_call_asm)
STREG %rp, -RP_OFFSET(%sp) /* save RP */
#ifdef CONFIG_64BIT
callee_save
ldo 2*REG_SZ(%sp), %sp /* room for a couple more saves */
STREG %r27, -1*REG_SZ(%sp)
STREG %r29, -2*REG_SZ(%sp)
#endif
STREG %sp, -REG_SZ(%arg0) /* save SP on real-mode stack */
copy %arg0, %sp /* adopt the real-mode SP */
/* save iodc_fn */
copy %arg2, %r31
/* load up the arg registers from the saved arg area */
/* 32-bit calling convention passes first 4 args in registers */
ldw 0(%arg1), %arg0 /* note overwriting arg0 */
ldw -8(%arg1), %arg2
ldw -12(%arg1), %arg3
ldw -4(%arg1), %arg1 /* obviously must do this one last! */
tophys_r1 %sp
b,l rfi_virt2real,%r2
nop
b,l save_control_regs,%r2 /* modifies r1, r2, r28 */
nop
#ifdef CONFIG_64BIT
rsm PSW_SM_W, %r0 /* go narrow */
#endif
load32 PA(ric_ret), %r2
bv 0(%r31)
nop
ric_ret:
#ifdef CONFIG_64BIT
ssm PSW_SM_W, %r0 /* go wide */
#endif
/* restore CRs before going virtual in case we page fault */
b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */
nop
b,l rfi_real2virt,%r2
nop
tovirt_r1 %sp
LDREG -REG_SZ(%sp), %sp /* restore SP */
#ifdef CONFIG_64BIT
LDREG -1*REG_SZ(%sp), %r27
LDREG -2*REG_SZ(%sp), %r29
ldo -2*REG_SZ(%sp), %sp
callee_rest
#endif
LDREG -RP_OFFSET(%sp), %rp /* restore RP */
bv 0(%rp)
nop
ENDPROC(real32_call_asm)
# define PUSH_CR(r, where) mfctl r, %r1 ! STREG,ma %r1, REG_SZ(where)
# define POP_CR(r, where) LDREG,mb -REG_SZ(where), %r1 ! mtctl %r1, r
__HEAD
save_control_regs:
load32 PA(save_cr_space), %r28
PUSH_CR(%cr24, %r28)
PUSH_CR(%cr25, %r28)
PUSH_CR(%cr26, %r28)
PUSH_CR(%cr27, %r28)
PUSH_CR(%cr28, %r28)
PUSH_CR(%cr29, %r28)
PUSH_CR(%cr30, %r28)
PUSH_CR(%cr31, %r28)
PUSH_CR(%cr15, %r28)
bv 0(%r2)
nop
restore_control_regs:
load32 PA(save_cr_end), %r26
POP_CR(%cr15, %r26)
POP_CR(%cr31, %r26)
POP_CR(%cr30, %r26)
POP_CR(%cr29, %r26)
POP_CR(%cr28, %r26)
POP_CR(%cr27, %r26)
POP_CR(%cr26, %r26)
POP_CR(%cr25, %r26)
POP_CR(%cr24, %r26)
bv 0(%r2)
nop
/* rfi_virt2real() and rfi_real2virt() could perhaps be adapted for
* more general-purpose use by the several places which need RFIs
*/
__HEAD
.align 128
rfi_virt2real:
/* switch to real mode... */
rsm PSW_SM_I,%r0
load32 PA(rfi_v2r_1), %r1
nop
nop
nop
nop
nop
rsm PSW_SM_Q,%r0 /* disable Q & I bits to load iia queue */
mtctl %r0, %cr17 /* Clear IIASQ tail */
mtctl %r0, %cr17 /* Clear IIASQ head */
mtctl %r1, %cr18 /* IIAOQ head */
ldo 4(%r1), %r1
mtctl %r1, %cr18 /* IIAOQ tail */
load32 REAL_MODE_PSW, %r1
mtctl %r1, %cr22
rfi
nop
nop
nop
nop
nop
nop
nop
nop
rfi_v2r_1:
tophys_r1 %r2
bv 0(%r2)
nop
__HEAD
.align 128
rfi_real2virt:
rsm PSW_SM_I,%r0
load32 (rfi_r2v_1), %r1
nop
nop
nop
nop
nop
rsm PSW_SM_Q,%r0 /* disable Q bit to load iia queue */
mtctl %r0, %cr17 /* Clear IIASQ tail */
mtctl %r0, %cr17 /* Clear IIASQ head */
mtctl %r1, %cr18 /* IIAOQ head */
ldo 4(%r1), %r1
mtctl %r1, %cr18 /* IIAOQ tail */
load32 KERNEL_PSW, %r1
mtctl %r1, %cr22
rfi
nop
nop
nop
nop
nop
nop
nop
nop
rfi_r2v_1:
tovirt_r1 %r2
bv 0(%r2)
nop
#ifdef CONFIG_64BIT
/************************ 64-bit real-mode calls ***********************/
/* This is only usable in wide kernels right now and will probably stay so */
__HEAD
/* unsigned long real64_call_asm(unsigned long *sp,
* unsigned long *arg0p,
* unsigned long fn)
* sp is value of stack pointer to adopt before calling PDC (virt)
* arg0p points to where saved arg values may be found
* iodc_fn is the IODC function to call
*/
ENTRY(real64_call_asm)
std %rp, -0x10(%sp) /* save RP */
std %sp, -8(%arg0) /* save SP on real-mode stack */
copy %arg0, %sp /* adopt the real-mode SP */
/* save fn */
copy %arg2, %r31
/* set up the new ap */
ldo 64(%arg1), %r29
/* load up the arg registers from the saved arg area */
/* 32-bit calling convention passes first 4 args in registers */
ldd 0*REG_SZ(%arg1), %arg0 /* note overwriting arg0 */
ldd 2*REG_SZ(%arg1), %arg2
ldd 3*REG_SZ(%arg1), %arg3
ldd 4*REG_SZ(%arg1), %r22
ldd 5*REG_SZ(%arg1), %r21
ldd 6*REG_SZ(%arg1), %r20
ldd 7*REG_SZ(%arg1), %r19
ldd 1*REG_SZ(%arg1), %arg1 /* do this one last! */
tophys_r1 %sp
b,l rfi_virt2real,%r2
nop
b,l save_control_regs,%r2 /* modifies r1, r2, r28 */
nop
load32 PA(r64_ret), %r2
bv 0(%r31)
nop
r64_ret:
/* restore CRs before going virtual in case we page fault */
b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */
nop
b,l rfi_real2virt,%r2
nop
tovirt_r1 %sp
ldd -8(%sp), %sp /* restore SP */
ldd -0x10(%sp), %rp /* restore RP */
bv 0(%rp)
nop
ENDPROC(real64_call_asm)
#endif
__HEAD
/* http://lists.parisc-linux.org/hypermail/parisc-linux/10916.html
** GCC 3.3 and later has a new function in libgcc.a for
** comparing function pointers.
*/
ENTRY(__canonicalize_funcptr_for_compare)
#ifdef CONFIG_64BIT
bve (%r2)
#else
bv %r0(%r2)
#endif
copy %r26,%r28
ENDPROC(__canonicalize_funcptr_for_compare)
