/* * * 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> 	.export real_stack	.export real64_stack	__PAGE_ALIGNED_BSSreal_stack:real64_stack:	.block	8192 #define N_SAVED_REGS 9	.section	.bsssave_cr_space:	.block	REG_SZ * N_SAVED_REGSsave_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_CFI(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)	nopric_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)	nopENDPROC_CFI(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 	.textENTRY_CFI(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)	nopENDPROC_CFI(save_control_regs) ENTRY_CFI(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)	nopENDPROC_CFI(restore_control_regs) /* rfi_virt2real() and rfi_real2virt() could perhaps be adapted for * more general-purpose use by the several places which need RFIs */	.text	.align 128ENTRY_CFI(rfi_virt2real)#if !defined(BOOTLOADER)	/* 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	noprfi_v2r_1:	tophys_r1 %r2#endif /* defined(BOOTLOADER) */	bv	0(%r2)	nopENDPROC_CFI(rfi_virt2real) 	.text	.align 128ENTRY_CFI(rfi_real2virt)#if !defined(BOOTLOADER)	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	noprfi_r2v_1:	tovirt_r1 %r2#endif /* defined(BOOTLOADER) */	bv	0(%r2)	nopENDPROC_CFI(rfi_real2virt) #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_CFI(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 	/* 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! */ 	/* set up real-mode stack and real-mode ap */	tophys_r1 %sp	ldo	-16(%sp), %r29			/* Reference param save area */ 	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)	nopr64_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)	nopENDPROC_CFI(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_CFI(__canonicalize_funcptr_for_compare)#ifdef CONFIG_64BIT	bve (%r2)#else	bv %r0(%r2)#endif	copy %r26,%r28ENDPROC_CFI(__canonicalize_funcptr_for_compare)