[deliverable/linux.git] / arch / parisc / kernel / real2.S

/*
 *
 * 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/pdc.h>
#include <asm/psw.h>
#include <asm/assembly.h>
#include <asm/asm-offsets.h>

#include <linux/linkage.h>


	.section	.bss

	.export pdc_result
	.export pdc_result2
	.align 8
pdc_result:
	.block	ASM_PDC_RESULT_SIZE
pdc_result2:
	.block	ASM_PDC_RESULT_SIZE

	.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 */

	.text

	/* 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

	.text
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
 */
	.text
	.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

	.text
	.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 */
	.text
	/* 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

	.text
	/* 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)
Commit	Line	Data
1da177e4 LT	1	/*
	2	*
	3	* This file is subject to the terms and conditions of the GNU General Public
	4	* License. See the file "COPYING" in the main directory of this archive
	5	* for more details.
	6	*
	7	* Copyright (C) 2000 Hewlett Packard (Paul Bame bame@puffin.external.hp.com)
	8	*
	9	*/
413059f2	10
6c86cb82	11	#include <asm/pdc.h>
1da177e4	12	#include <asm/psw.h>
896a3756	13	#include <asm/assembly.h>
6c86cb82	14	#include <asm/asm-offsets.h>
1da177e4	15
8e9e9844 HD	16	#include <linux/linkage.h>
8e9e9844 HD	17
6c86cb82	18
1da177e4	19	.section .bss
6c86cb82 KM	20
	21	.export pdc_result
	22	.export pdc_result2
	23	.align 8
	24	pdc_result:
	25	.block ASM_PDC_RESULT_SIZE
	26	pdc_result2:
	27	.block ASM_PDC_RESULT_SIZE
	28
1da177e4 LT	29	.export real_stack
	30	.export real32_stack
	31	.export real64_stack
	32	.align 64
	33	real_stack:
	34	real32_stack:
	35	real64_stack:
	36	.block 8192
	37
413059f2	38	#ifdef CONFIG_64BIT
1da177e4 LT	39	# define REG_SZ 8
	40	#else
	41	# define REG_SZ 4
	42	#endif
	43
	44	#define N_SAVED_REGS 9
	45
	46	save_cr_space:
	47	.block REG_SZ * N_SAVED_REGS
	48	save_cr_end:
	49
	50
	51	/********************** 32-bit real-mode calls *********************/
	52	/* This can be called in both narrow and wide kernels */
	53
dfcf753b	54	.text
1da177e4	55
1da177e4 LT	56	/* unsigned long real32_call_asm(unsigned int *sp,
	57	* unsigned int *arg0p,
	58	* unsigned int iodc_fn)
	59	* sp is value of stack pointer to adopt before calling PDC (virt)
	60	* arg0p points to where saved arg values may be found
	61	* iodc_fn is the IODC function to call
	62	*/
	63
8e9e9844	64	ENTRY(real32_call_asm)
1da177e4	65	STREG %rp, -RP_OFFSET(%sp) /* save RP */
413059f2	66	#ifdef CONFIG_64BIT
1da177e4 LT	67	callee_save
	68	ldo 2REG_SZ(%sp), %sp / room for a couple more saves */
	69	STREG %r27, -1*REG_SZ(%sp)
	70	STREG %r29, -2*REG_SZ(%sp)
	71	#endif
	72	STREG %sp, -REG_SZ(%arg0) /* save SP on real-mode stack */
	73	copy %arg0, %sp /* adopt the real-mode SP */
	74
	75	/* save iodc_fn */
	76	copy %arg2, %r31
	77
	78	/* load up the arg registers from the saved arg area */
	79	/* 32-bit calling convention passes first 4 args in registers */
	80	ldw 0(%arg1), %arg0 /* note overwriting arg0 */
	81	ldw -8(%arg1), %arg2
	82	ldw -12(%arg1), %arg3
	83	ldw -4(%arg1), %arg1 /* obviously must do this one last! */
	84
	85	tophys_r1 %sp
	86
	87	b,l rfi_virt2real,%r2
	88	nop
	89
	90	b,l save_control_regs,%r2 /* modifies r1, r2, r28 */
	91	nop
	92
413059f2	93	#ifdef CONFIG_64BIT
1da177e4 LT	94	rsm PSW_SM_W, %r0 /* go narrow */
	95	#endif
	96
	97	load32 PA(ric_ret), %r2
	98	bv 0(%r31)
	99	nop
	100	ric_ret:
413059f2	101	#ifdef CONFIG_64BIT
1da177e4 LT	102	ssm PSW_SM_W, %r0 /* go wide */
	103	#endif
	104	/* restore CRs before going virtual in case we page fault */
	105	b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */
	106	nop
	107
	108	b,l rfi_real2virt,%r2
	109	nop
	110
	111	tovirt_r1 %sp
	112	LDREG -REG_SZ(%sp), %sp /* restore SP */
413059f2	113	#ifdef CONFIG_64BIT
1da177e4 LT	114	LDREG -1*REG_SZ(%sp), %r27
	115	LDREG -2*REG_SZ(%sp), %r29
	116	ldo -2*REG_SZ(%sp), %sp
	117	callee_rest
	118	#endif
	119	LDREG -RP_OFFSET(%sp), %rp /* restore RP */
	120	bv 0(%rp)
	121	nop
8e9e9844	122	ENDPROC(real32_call_asm)
1da177e4 LT	123
	124
	125	# define PUSH_CR(r, where) mfctl r, %r1 ! STREG,ma %r1, REG_SZ(where)
	126	# define POP_CR(r, where) LDREG,mb -REG_SZ(where), %r1 ! mtctl %r1, r
	127
dfcf753b	128	.text
1da177e4 LT	129	save_control_regs:
	130	load32 PA(save_cr_space), %r28
	131	PUSH_CR(%cr24, %r28)
	132	PUSH_CR(%cr25, %r28)
	133	PUSH_CR(%cr26, %r28)
	134	PUSH_CR(%cr27, %r28)
	135	PUSH_CR(%cr28, %r28)
	136	PUSH_CR(%cr29, %r28)
	137	PUSH_CR(%cr30, %r28)
	138	PUSH_CR(%cr31, %r28)
	139	PUSH_CR(%cr15, %r28)
	140	bv 0(%r2)
	141	nop
	142
	143	restore_control_regs:
	144	load32 PA(save_cr_end), %r26
	145	POP_CR(%cr15, %r26)
	146	POP_CR(%cr31, %r26)
	147	POP_CR(%cr30, %r26)
	148	POP_CR(%cr29, %r26)
	149	POP_CR(%cr28, %r26)
	150	POP_CR(%cr27, %r26)
	151	POP_CR(%cr26, %r26)
	152	POP_CR(%cr25, %r26)
	153	POP_CR(%cr24, %r26)
	154	bv 0(%r2)
	155	nop
	156
	157	/* rfi_virt2real() and rfi_real2virt() could perhaps be adapted for
	158	* more general-purpose use by the several places which need RFIs
	159	*/
dfcf753b	160	.text
e55fb3e7	161	.align 128
1da177e4 LT	162	rfi_virt2real:
1da177e4 LT	163	/* switch to real mode... */
896a3756 GG	164	rsm PSW_SM_I,%r0
896a3756 GG	165	load32 PA(rfi_v2r_1), %r1
1da177e4 LT	166	nop
	167	nop
	168	nop
	169	nop
	170	nop
	171
896a3756	172	rsm PSW_SM_Q,%r0 /* disable Q & I bits to load iia queue */
1da177e4 LT	173	mtctl %r0, %cr17 /* Clear IIASQ tail */
1da177e4 LT	174	mtctl %r0, %cr17 /* Clear IIASQ head */
1da177e4 LT	175	mtctl %r1, %cr18 /* IIAOQ head */
	176	ldo 4(%r1), %r1
	177	mtctl %r1, %cr18 /* IIAOQ tail */
	178	load32 REAL_MODE_PSW, %r1
	179	mtctl %r1, %cr22
	180	rfi
	181
	182	nop
	183	nop
	184	nop
	185	nop
	186	nop
	187	nop
	188	nop
	189	nop
	190	rfi_v2r_1:
	191	tophys_r1 %r2
	192	bv 0(%r2)
	193	nop
	194
dfcf753b	195	.text
1da177e4 LT	196	.align 128
1da177e4 LT	197	rfi_real2virt:
896a3756 GG	198	rsm PSW_SM_I,%r0
896a3756 GG	199	load32 (rfi_r2v_1), %r1
1da177e4 LT	200	nop
	201	nop
	202	nop
	203	nop
	204	nop
	205
	206	rsm PSW_SM_Q,%r0 /* disable Q bit to load iia queue */
	207	mtctl %r0, %cr17 /* Clear IIASQ tail */
	208	mtctl %r0, %cr17 /* Clear IIASQ head */
1da177e4 LT	209	mtctl %r1, %cr18 /* IIAOQ head */
	210	ldo 4(%r1), %r1
	211	mtctl %r1, %cr18 /* IIAOQ tail */
	212	load32 KERNEL_PSW, %r1
	213	mtctl %r1, %cr22
	214	rfi
	215
	216	nop
	217	nop
	218	nop
	219	nop
	220	nop
	221	nop
	222	nop
	223	nop
	224	rfi_r2v_1:
	225	tovirt_r1 %r2
	226	bv 0(%r2)
	227	nop
	228
413059f2	229	#ifdef CONFIG_64BIT
1da177e4 LT	230
	231	/********************** 64-bit real-mode calls *********************/
	232	/* This is only usable in wide kernels right now and will probably stay so */
dfcf753b	233	.text
1da177e4 LT	234	/* unsigned long real64_call_asm(unsigned long *sp,
	235	* unsigned long *arg0p,
	236	* unsigned long fn)
	237	* sp is value of stack pointer to adopt before calling PDC (virt)
	238	* arg0p points to where saved arg values may be found
	239	* iodc_fn is the IODC function to call
	240	*/
8e9e9844	241	ENTRY(real64_call_asm)
1da177e4 LT	242	std %rp, -0x10(%sp) /* save RP */
	243	std %sp, -8(%arg0) /* save SP on real-mode stack */
	244	copy %arg0, %sp /* adopt the real-mode SP */
	245
	246	/* save fn */
	247	copy %arg2, %r31
	248
	249	/* set up the new ap */
	250	ldo 64(%arg1), %r29
	251
	252	/* load up the arg registers from the saved arg area */
	253	/* 32-bit calling convention passes first 4 args in registers */
	254	ldd 0REG_SZ(%arg1), %arg0 / note overwriting arg0 */
	255	ldd 2*REG_SZ(%arg1), %arg2
	256	ldd 3*REG_SZ(%arg1), %arg3
	257	ldd 4*REG_SZ(%arg1), %r22
	258	ldd 5*REG_SZ(%arg1), %r21
	259	ldd 6*REG_SZ(%arg1), %r20
	260	ldd 7*REG_SZ(%arg1), %r19
	261	ldd 1REG_SZ(%arg1), %arg1 / do this one last! */
	262
	263	tophys_r1 %sp
	264
	265	b,l rfi_virt2real,%r2
	266	nop
	267
	268	b,l save_control_regs,%r2 /* modifies r1, r2, r28 */
	269	nop
	270
	271	load32 PA(r64_ret), %r2
	272	bv 0(%r31)
	273	nop
	274	r64_ret:
	275	/* restore CRs before going virtual in case we page fault */
	276	b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */
	277	nop
	278
	279	b,l rfi_real2virt,%r2
	280	nop
	281
	282	tovirt_r1 %sp
	283	ldd -8(%sp), %sp /* restore SP */
	284	ldd -0x10(%sp), %rp /* restore RP */
	285	bv 0(%rp)
	286	nop
8e9e9844	287	ENDPROC(real64_call_asm)
1da177e4 LT	288
	289	#endif
	290
dfcf753b	291	.text
1da177e4 LT	292	/* http://lists.parisc-linux.org/hypermail/parisc-linux/10916.html
	293	** GCC 3.3 and later has a new function in libgcc.a for
	294	** comparing function pointers.
	295	*/
8e9e9844	296	ENTRY(__canonicalize_funcptr_for_compare)
413059f2	297	#ifdef CONFIG_64BIT
1da177e4 LT	298	bve (%r2)
	299	#else
	300	bv %r0(%r2)
	301	#endif
	302	copy %r26,%r28
8e9e9844 HD	303	ENDPROC(__canonicalize_funcptr_for_compare)
8e9e9844 HD	304