xref: /openbmc/linux/arch/powerpc/include/asm/ppc_asm.h (revision afc63868)

/*
 * Copyright (C) 1995-1999 Gary Thomas, Paul Mackerras, Cort Dougan.
 */
#ifndef _ASM_POWERPC_PPC_ASM_H
#define _ASM_POWERPC_PPC_ASM_H

#include <linux/stringify.h>
#include <asm/asm-compat.h>
#include <asm/processor.h>
#include <asm/ppc-opcode.h>
#include <asm/firmware.h>
#include <asm/feature-fixups.h>
#include <asm/extable.h>

#ifdef __ASSEMBLY__

#define SZL			(BITS_PER_LONG/8)

/*
 * This expands to a sequence of operations with reg incrementing from
 * start to end inclusive, of this form:
 *
 *   op  reg, (offset + (width * reg))(base)
 *
 * Note that offset is not the offset of the first operation unless start
 * is zero (or width is zero).
 */
.macro OP_REGS op, width, start, end, base, offset
	.Lreg=\start
	.rept (\end - \start + 1)
	\op	.Lreg, \offset + \width * .Lreg(\base)
	.Lreg=.Lreg+1
	.endr
.endm

/*
 * This expands to a sequence of register clears for regs start to end
 * inclusive, of the form:
 *
 *   li rN, 0
 */
.macro ZEROIZE_REGS start, end
	.Lreg=\start
	.rept (\end - \start + 1)
	li	.Lreg, 0
	.Lreg=.Lreg+1
	.endr
.endm

/*
 * Macros for storing registers into and loading registers from
 * exception frames.
 */
#ifdef __powerpc64__
#define SAVE_GPRS(start, end, base)	OP_REGS std, 8, start, end, base, GPR0
#define REST_GPRS(start, end, base)	OP_REGS ld, 8, start, end, base, GPR0
#define SAVE_NVGPRS(base)		SAVE_GPRS(14, 31, base)
#define REST_NVGPRS(base)		REST_GPRS(14, 31, base)
#else
#define SAVE_GPRS(start, end, base)	OP_REGS stw, 4, start, end, base, GPR0
#define REST_GPRS(start, end, base)	OP_REGS lwz, 4, start, end, base, GPR0
#define SAVE_NVGPRS(base)		SAVE_GPRS(13, 31, base)
#define REST_NVGPRS(base)		REST_GPRS(13, 31, base)
#endif

#define	ZEROIZE_GPRS(start, end)	ZEROIZE_REGS start, end
#ifdef __powerpc64__
#define	ZEROIZE_NVGPRS()		ZEROIZE_GPRS(14, 31)
#else
#define	ZEROIZE_NVGPRS()		ZEROIZE_GPRS(13, 31)
#endif
#define	ZEROIZE_GPR(n)			ZEROIZE_GPRS(n, n)

#define SAVE_GPR(n, base)		SAVE_GPRS(n, n, base)
#define REST_GPR(n, base)		REST_GPRS(n, n, base)

/* macros for handling user register sanitisation */
#ifdef CONFIG_INTERRUPT_SANITIZE_REGISTERS
#define SANITIZE_SYSCALL_GPRS()			ZEROIZE_GPR(0);		\
						ZEROIZE_GPRS(5, 12);	\
						ZEROIZE_NVGPRS()
#define SANITIZE_GPR(n)				ZEROIZE_GPR(n)
#define SANITIZE_GPRS(start, end)		ZEROIZE_GPRS(start, end)
#define SANITIZE_NVGPRS()			ZEROIZE_NVGPRS()
#define SANITIZE_RESTORE_NVGPRS()		REST_NVGPRS(r1)
#define HANDLER_RESTORE_NVGPRS()
#else
#define SANITIZE_SYSCALL_GPRS()
#define SANITIZE_GPR(n)
#define SANITIZE_GPRS(start, end)
#define SANITIZE_NVGPRS()
#define SANITIZE_RESTORE_NVGPRS()
#define HANDLER_RESTORE_NVGPRS()		REST_NVGPRS(r1)
#endif /* CONFIG_INTERRUPT_SANITIZE_REGISTERS */

#define SAVE_FPR(n, base)	stfd	n,8*TS_FPRWIDTH*(n)(base)
#define SAVE_2FPRS(n, base)	SAVE_FPR(n, base); SAVE_FPR(n+1, base)
#define SAVE_4FPRS(n, base)	SAVE_2FPRS(n, base); SAVE_2FPRS(n+2, base)
#define SAVE_8FPRS(n, base)	SAVE_4FPRS(n, base); SAVE_4FPRS(n+4, base)
#define SAVE_16FPRS(n, base)	SAVE_8FPRS(n, base); SAVE_8FPRS(n+8, base)
#define SAVE_32FPRS(n, base)	SAVE_16FPRS(n, base); SAVE_16FPRS(n+16, base)
#define REST_FPR(n, base)	lfd	n,8*TS_FPRWIDTH*(n)(base)
#define REST_2FPRS(n, base)	REST_FPR(n, base); REST_FPR(n+1, base)
#define REST_4FPRS(n, base)	REST_2FPRS(n, base); REST_2FPRS(n+2, base)
#define REST_8FPRS(n, base)	REST_4FPRS(n, base); REST_4FPRS(n+4, base)
#define REST_16FPRS(n, base)	REST_8FPRS(n, base); REST_8FPRS(n+8, base)
#define REST_32FPRS(n, base)	REST_16FPRS(n, base); REST_16FPRS(n+16, base)

#define SAVE_VR(n,b,base)	li b,16*(n);  stvx n,base,b
#define SAVE_2VRS(n,b,base)	SAVE_VR(n,b,base); SAVE_VR(n+1,b,base)
#define SAVE_4VRS(n,b,base)	SAVE_2VRS(n,b,base); SAVE_2VRS(n+2,b,base)
#define SAVE_8VRS(n,b,base)	SAVE_4VRS(n,b,base); SAVE_4VRS(n+4,b,base)
#define SAVE_16VRS(n,b,base)	SAVE_8VRS(n,b,base); SAVE_8VRS(n+8,b,base)
#define SAVE_32VRS(n,b,base)	SAVE_16VRS(n,b,base); SAVE_16VRS(n+16,b,base)
#define REST_VR(n,b,base)	li b,16*(n); lvx n,base,b
#define REST_2VRS(n,b,base)	REST_VR(n,b,base); REST_VR(n+1,b,base)
#define REST_4VRS(n,b,base)	REST_2VRS(n,b,base); REST_2VRS(n+2,b,base)
#define REST_8VRS(n,b,base)	REST_4VRS(n,b,base); REST_4VRS(n+4,b,base)
#define REST_16VRS(n,b,base)	REST_8VRS(n,b,base); REST_8VRS(n+8,b,base)
#define REST_32VRS(n,b,base)	REST_16VRS(n,b,base); REST_16VRS(n+16,b,base)

#ifdef __BIG_ENDIAN__
#define STXVD2X_ROT(n,b,base)		STXVD2X(n,b,base)
#define LXVD2X_ROT(n,b,base)		LXVD2X(n,b,base)
#else
#define STXVD2X_ROT(n,b,base)		XXSWAPD(n,n);		\
					STXVD2X(n,b,base);	\
					XXSWAPD(n,n)

#define LXVD2X_ROT(n,b,base)		LXVD2X(n,b,base);	\
					XXSWAPD(n,n)
#endif
/* Save the lower 32 VSRs in the thread VSR region */
#define SAVE_VSR(n,b,base)	li b,16*(n);  STXVD2X_ROT(n,R##base,R##b)
#define SAVE_2VSRS(n,b,base)	SAVE_VSR(n,b,base); SAVE_VSR(n+1,b,base)
#define SAVE_4VSRS(n,b,base)	SAVE_2VSRS(n,b,base); SAVE_2VSRS(n+2,b,base)
#define SAVE_8VSRS(n,b,base)	SAVE_4VSRS(n,b,base); SAVE_4VSRS(n+4,b,base)
#define SAVE_16VSRS(n,b,base)	SAVE_8VSRS(n,b,base); SAVE_8VSRS(n+8,b,base)
#define SAVE_32VSRS(n,b,base)	SAVE_16VSRS(n,b,base); SAVE_16VSRS(n+16,b,base)
#define REST_VSR(n,b,base)	li b,16*(n); LXVD2X_ROT(n,R##base,R##b)
#define REST_2VSRS(n,b,base)	REST_VSR(n,b,base); REST_VSR(n+1,b,base)
#define REST_4VSRS(n,b,base)	REST_2VSRS(n,b,base); REST_2VSRS(n+2,b,base)
#define REST_8VSRS(n,b,base)	REST_4VSRS(n,b,base); REST_4VSRS(n+4,b,base)
#define REST_16VSRS(n,b,base)	REST_8VSRS(n,b,base); REST_8VSRS(n+8,b,base)
#define REST_32VSRS(n,b,base)	REST_16VSRS(n,b,base); REST_16VSRS(n+16,b,base)

/*
 * b = base register for addressing, o = base offset from register of 1st EVR
 * n = first EVR, s = scratch
 */
#define SAVE_EVR(n,s,b,o)	evmergehi s,s,n; stw s,o+4*(n)(b)
#define SAVE_2EVRS(n,s,b,o)	SAVE_EVR(n,s,b,o); SAVE_EVR(n+1,s,b,o)
#define SAVE_4EVRS(n,s,b,o)	SAVE_2EVRS(n,s,b,o); SAVE_2EVRS(n+2,s,b,o)
#define SAVE_8EVRS(n,s,b,o)	SAVE_4EVRS(n,s,b,o); SAVE_4EVRS(n+4,s,b,o)
#define SAVE_16EVRS(n,s,b,o)	SAVE_8EVRS(n,s,b,o); SAVE_8EVRS(n+8,s,b,o)
#define SAVE_32EVRS(n,s,b,o)	SAVE_16EVRS(n,s,b,o); SAVE_16EVRS(n+16,s,b,o)
#define REST_EVR(n,s,b,o)	lwz s,o+4*(n)(b); evmergelo n,s,n
#define REST_2EVRS(n,s,b,o)	REST_EVR(n,s,b,o); REST_EVR(n+1,s,b,o)
#define REST_4EVRS(n,s,b,o)	REST_2EVRS(n,s,b,o); REST_2EVRS(n+2,s,b,o)
#define REST_8EVRS(n,s,b,o)	REST_4EVRS(n,s,b,o); REST_4EVRS(n+4,s,b,o)
#define REST_16EVRS(n,s,b,o)	REST_8EVRS(n,s,b,o); REST_8EVRS(n+8,s,b,o)
#define REST_32EVRS(n,s,b,o)	REST_16EVRS(n,s,b,o); REST_16EVRS(n+16,s,b,o)

/* Macros to adjust thread priority for hardware multithreading */
#define HMT_VERY_LOW	or	31,31,31	# very low priority
#define HMT_LOW		or	1,1,1
#define HMT_MEDIUM_LOW  or	6,6,6		# medium low priority
#define HMT_MEDIUM	or	2,2,2
#define HMT_MEDIUM_HIGH or	5,5,5		# medium high priority
#define HMT_HIGH	or	3,3,3
#define HMT_EXTRA_HIGH	or	7,7,7		# power7 only

#ifdef CONFIG_PPC64
#define ULONG_SIZE 	8
#else
#define ULONG_SIZE	4
#endif
#define __VCPU_GPR(n)	(VCPU_GPRS + (n * ULONG_SIZE))
#define VCPU_GPR(n)	__VCPU_GPR(__REG_##n)

#ifdef __KERNEL__

/*
 * Used to name C functions called from asm
 */
#ifdef CONFIG_PPC_KERNEL_PCREL
#define CFUNC(name) name@notoc
#else
#define CFUNC(name) name
#endif

/*
 * We use __powerpc64__ here because we want the compat VDSO to use the 32-bit
 * version below in the else case of the ifdef.
 */
#ifdef __powerpc64__

#define STACKFRAMESIZE 256
#define __STK_REG(i)   (112 + ((i)-14)*8)
#define STK_REG(i)     __STK_REG(__REG_##i)

#ifdef CONFIG_PPC64_ELF_ABI_V2
#define STK_GOT		24
#define __STK_PARAM(i)	(32 + ((i)-3)*8)
#else
#define STK_GOT		40
#define __STK_PARAM(i)	(48 + ((i)-3)*8)
#endif
#define STK_PARAM(i)	__STK_PARAM(__REG_##i)

#ifdef CONFIG_PPC64_ELF_ABI_V2

#define _GLOBAL(name) \
	.align 2 ; \
	.type name,@function; \
	.globl name; \
name:

#ifdef CONFIG_PPC_KERNEL_PCREL
#define _GLOBAL_TOC _GLOBAL
#else
#define _GLOBAL_TOC(name) \
	.align 2 ; \
	.type name,@function; \
	.globl name; \
name: \
0:	addis r2,r12,(.TOC.-0b)@ha; \
	addi r2,r2,(.TOC.-0b)@l; \
	.localentry name,.-name
#endif

#define DOTSYM(a)	a

#else

#define XGLUE(a,b) a##b
#define GLUE(a,b) XGLUE(a,b)

#define _GLOBAL(name) \
	.align 2 ; \
	.globl name; \
	.globl GLUE(.,name); \
	.pushsection ".opd","aw"; \
name: \
	.quad GLUE(.,name); \
	.quad .TOC.@tocbase; \
	.quad 0; \
	.popsection; \
	.type GLUE(.,name),@function; \
GLUE(.,name):

#define _GLOBAL_TOC(name) _GLOBAL(name)

#define DOTSYM(a)	GLUE(.,a)

#endif

#else /* 32-bit */

#define _GLOBAL(n)	\
	.globl n;	\
n:

#define _GLOBAL_TOC(name) _GLOBAL(name)

#define DOTSYM(a)	a

#endif

/*
 * __kprobes (the C annotation) puts the symbol into the .kprobes.text
 * section, which gets emitted at the end of regular text.
 *
 * _ASM_NOKPROBE_SYMBOL and NOKPROBE_SYMBOL just adds the symbol to
 * a blacklist. The former is for core kprobe functions/data, the
 * latter is for those that incdentially must be excluded from probing
 * and allows them to be linked at more optimal location within text.
 */
#ifdef CONFIG_KPROBES
#define _ASM_NOKPROBE_SYMBOL(entry)			\
	.pushsection "_kprobe_blacklist","aw";		\
	PPC_LONG (entry) ;				\
	.popsection
#else
#define _ASM_NOKPROBE_SYMBOL(entry)
#endif

#define FUNC_START(name)	_GLOBAL(name)
#define FUNC_END(name)

/*
 * LOAD_REG_IMMEDIATE(rn, expr)
 *   Loads the value of the constant expression 'expr' into register 'rn'
 *   using immediate instructions only.  Use this when it's important not
 *   to reference other data (i.e. on ppc64 when the TOC pointer is not
 *   valid) and when 'expr' is a constant or absolute address.
 *
 * LOAD_REG_ADDR(rn, name)
 *   Loads the address of label 'name' into register 'rn'.  Use this when
 *   you don't particularly need immediate instructions only, but you need
 *   the whole address in one register (e.g. it's a structure address and
 *   you want to access various offsets within it).  On ppc32 this is
 *   identical to LOAD_REG_IMMEDIATE.
 *
 * LOAD_REG_ADDR_PIC(rn, name)
 *   Loads the address of label 'name' into register 'run'. Use this when
 *   the kernel doesn't run at the linked or relocated address. Please
 *   note that this macro will clobber the lr register.
 *
 * LOAD_REG_ADDRBASE(rn, name)
 * ADDROFF(name)
 *   LOAD_REG_ADDRBASE loads part of the address of label 'name' into
 *   register 'rn'.  ADDROFF(name) returns the remainder of the address as
 *   a constant expression.  ADDROFF(name) is a signed expression < 16 bits
 *   in size, so is suitable for use directly as an offset in load and store
 *   instructions.  Use this when loading/storing a single word or less as:
 *      LOAD_REG_ADDRBASE(rX, name)
 *      ld	rY,ADDROFF(name)(rX)
 */

/* Be careful, this will clobber the lr register. */
#define LOAD_REG_ADDR_PIC(reg, name)		\
	bcl	20,31,$+4;			\
0:	mflr	reg;				\
	addis	reg,reg,(name - 0b)@ha;		\
	addi	reg,reg,(name - 0b)@l;

#if defined(__powerpc64__) && defined(HAVE_AS_ATHIGH)
#define __AS_ATHIGH high
#else
#define __AS_ATHIGH h
#endif

.macro __LOAD_REG_IMMEDIATE_32 r, x
	.if (\x) >= 0x8000 || (\x) < -0x8000
		lis \r, (\x)@__AS_ATHIGH
		.if (\x) & 0xffff != 0
			ori \r, \r, (\x)@l
		.endif
	.else
		li \r, (\x)@l
	.endif
.endm

.macro __LOAD_REG_IMMEDIATE r, x
	.if (\x) >= 0x80000000 || (\x) < -0x80000000
		__LOAD_REG_IMMEDIATE_32 \r, (\x) >> 32
		sldi	\r, \r, 32
		.if (\x) & 0xffff0000 != 0
			oris \r, \r, (\x)@__AS_ATHIGH
		.endif
		.if (\x) & 0xffff != 0
			ori \r, \r, (\x)@l
		.endif
	.else
		__LOAD_REG_IMMEDIATE_32 \r, \x
	.endif
.endm

#ifdef __powerpc64__

#ifdef CONFIG_PPC_KERNEL_PCREL
#define __LOAD_PACA_TOC(reg)			\
	li	reg,-1
#else
#define __LOAD_PACA_TOC(reg)			\
	ld	reg,PACATOC(r13)
#endif

#define LOAD_PACA_TOC()				\
	__LOAD_PACA_TOC(r2)

#define LOAD_REG_IMMEDIATE(reg, expr) __LOAD_REG_IMMEDIATE reg, expr

#define LOAD_REG_IMMEDIATE_SYM(reg, tmp, expr)	\
	lis	tmp, (expr)@highest;		\
	lis	reg, (expr)@__AS_ATHIGH;	\
	ori	tmp, tmp, (expr)@higher;	\
	ori	reg, reg, (expr)@l;		\
	rldimi	reg, tmp, 32, 0

#ifdef CONFIG_PPC_KERNEL_PCREL
#define LOAD_REG_ADDR(reg,name)			\
	pla	reg,name@pcrel

#else
#define LOAD_REG_ADDR(reg,name)			\
	addis	reg,r2,name@toc@ha;		\
	addi	reg,reg,name@toc@l
#endif

#ifdef CONFIG_PPC_BOOK3E_64
/*
 * This is used in register-constrained interrupt handlers. Not to be used
 * by BOOK3S. ld complains with "got/toc optimization is not supported" if r2
 * is not used for the TOC offset, so use @got(tocreg). If the interrupt
 * handlers saved r2 instead, LOAD_REG_ADDR could be used.
 */
#define LOAD_REG_ADDR_ALTTOC(reg,tocreg,name)	\
	ld	reg,name@got(tocreg)
#endif

#define LOAD_REG_ADDRBASE(reg,name)	LOAD_REG_ADDR(reg,name)
#define ADDROFF(name)			0

/* offsets for stack frame layout */
#define LRSAVE	16

/*
 * GCC stack frames follow a different pattern on 32 vs 64. This can be used
 * to make asm frames be consistent with C.
 */
#define PPC_CREATE_STACK_FRAME(size)			\
	mflr		r0;				\
	std		r0,16(r1);			\
	stdu		r1,-(size)(r1)

#else /* 32-bit */

#define LOAD_REG_IMMEDIATE(reg, expr) __LOAD_REG_IMMEDIATE_32 reg, expr

#define LOAD_REG_IMMEDIATE_SYM(reg,expr)		\
	lis	reg,(expr)@ha;		\
	addi	reg,reg,(expr)@l;

#define LOAD_REG_ADDR(reg,name)		LOAD_REG_IMMEDIATE_SYM(reg, name)

#define LOAD_REG_ADDRBASE(reg, name)	lis	reg,name@ha
#define ADDROFF(name)			name@l

/* offsets for stack frame layout */
#define LRSAVE	4

#define PPC_CREATE_STACK_FRAME(size)			\
	stwu		r1,-(size)(r1);			\
	mflr		r0;				\
	stw		r0,(size+4)(r1)

#endif

/* various errata or part fixups */
#if defined(CONFIG_PPC_CELL) || defined(CONFIG_PPC_E500)
#define MFTB(dest)			\
90:	mfspr dest, SPRN_TBRL;		\
BEGIN_FTR_SECTION_NESTED(96);		\
	cmpwi dest,0;			\
	beq-  90b;			\
END_FTR_SECTION_NESTED(CPU_FTR_CELL_TB_BUG, CPU_FTR_CELL_TB_BUG, 96)
#else
#define MFTB(dest)			MFTBL(dest)
#endif

#ifdef CONFIG_PPC_8xx
#define MFTBL(dest)			mftb dest
#define MFTBU(dest)			mftbu dest
#else
#define MFTBL(dest)			mfspr dest, SPRN_TBRL
#define MFTBU(dest)			mfspr dest, SPRN_TBRU
#endif

#ifndef CONFIG_SMP
#define TLBSYNC
#else
#define TLBSYNC		tlbsync; sync
#endif

#ifdef CONFIG_PPC64
#define MTOCRF(FXM, RS)			\
	BEGIN_FTR_SECTION_NESTED(848);	\
	mtcrf	(FXM), RS;		\
	FTR_SECTION_ELSE_NESTED(848);	\
	mtocrf (FXM), RS;		\
	ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_NOEXECUTE, 848)
#endif

/*
 * This instruction is not implemented on the PPC 603 or 601; however, on
 * the 403GCX and 405GP tlbia IS defined and tlbie is not.
 * All of these instructions exist in the 8xx, they have magical powers,
 * and they must be used.
 */

#if !defined(CONFIG_4xx) && !defined(CONFIG_PPC_8xx)
#define tlbia					\
	li	r4,1024;			\
	mtctr	r4;				\
	lis	r4,KERNELBASE@h;		\
	.machine push;				\
	.machine "power4";			\
0:	tlbie	r4;				\
	.machine pop;				\
	addi	r4,r4,0x1000;			\
	bdnz	0b
#endif


#ifdef CONFIG_IBM440EP_ERR42
#define PPC440EP_ERR42 isync
#else
#define PPC440EP_ERR42
#endif

/* The following stops all load and store data streams associated with stream
 * ID (ie. streams created explicitly).  The embedded and server mnemonics for
 * dcbt are different so this must only be used for server.
 */
#define DCBT_BOOK3S_STOP_ALL_STREAM_IDS(scratch)	\
       lis     scratch,0x60000000@h;			\
       dcbt    0,scratch,0b01010

/*
 * toreal/fromreal/tophys/tovirt macros. 32-bit BookE makes them
 * keep the address intact to be compatible with code shared with
 * 32-bit classic.
 *
 * On the other hand, I find it useful to have them behave as expected
 * by their name (ie always do the addition) on 64-bit BookE
 */
#if defined(CONFIG_BOOKE) && !defined(CONFIG_PPC64)
#define toreal(rd)
#define fromreal(rd)

/*
 * We use addis to ensure compatibility with the "classic" ppc versions of
 * these macros, which use rs = 0 to get the tophys offset in rd, rather than
 * converting the address in r0, and so this version has to do that too
 * (i.e. set register rd to 0 when rs == 0).
 */
#define tophys(rd,rs)				\
	addis	rd,rs,0

#define tovirt(rd,rs)				\
	addis	rd,rs,0

#elif defined(CONFIG_PPC64)
#define toreal(rd)		/* we can access c000... in real mode */
#define fromreal(rd)

#define tophys(rd,rs)                           \
	clrldi	rd,rs,2

#define tovirt(rd,rs)                           \
	rotldi	rd,rs,16;			\
	ori	rd,rd,((KERNELBASE>>48)&0xFFFF);\
	rotldi	rd,rd,48
#else
#define toreal(rd)	tophys(rd,rd)
#define fromreal(rd)	tovirt(rd,rd)

#define tophys(rd, rs)	addis	rd, rs, -PAGE_OFFSET@h
#define tovirt(rd, rs)	addis	rd, rs, PAGE_OFFSET@h
#endif

#ifdef CONFIG_PPC_BOOK3S_64
#define MTMSRD(r)	mtmsrd	r
#define MTMSR_EERI(reg)	mtmsrd	reg,1
#else
#define MTMSRD(r)	mtmsr	r
#define MTMSR_EERI(reg)	mtmsr	reg
#endif

#endif /* __KERNEL__ */

/* The boring bits... */

/* Condition Register Bit Fields */

#define	cr0	0
#define	cr1	1
#define	cr2	2
#define	cr3	3
#define	cr4	4
#define	cr5	5
#define	cr6	6
#define	cr7	7


/*
 * General Purpose Registers (GPRs)
 *
 * The lower case r0-r31 should be used in preference to the upper
 * case R0-R31 as they provide more error checking in the assembler.
 * Use R0-31 only when really nessesary.
 */

#define	r0	%r0
#define	r1	%r1
#define	r2	%r2
#define	r3	%r3
#define	r4	%r4
#define	r5	%r5
#define	r6	%r6
#define	r7	%r7
#define	r8	%r8
#define	r9	%r9
#define	r10	%r10
#define	r11	%r11
#define	r12	%r12
#define	r13	%r13
#define	r14	%r14
#define	r15	%r15
#define	r16	%r16
#define	r17	%r17
#define	r18	%r18
#define	r19	%r19
#define	r20	%r20
#define	r21	%r21
#define	r22	%r22
#define	r23	%r23
#define	r24	%r24
#define	r25	%r25
#define	r26	%r26
#define	r27	%r27
#define	r28	%r28
#define	r29	%r29
#define	r30	%r30
#define	r31	%r31


/* Floating Point Registers (FPRs) */

#define	fr0	0
#define	fr1	1
#define	fr2	2
#define	fr3	3
#define	fr4	4
#define	fr5	5
#define	fr6	6
#define	fr7	7
#define	fr8	8
#define	fr9	9
#define	fr10	10
#define	fr11	11
#define	fr12	12
#define	fr13	13
#define	fr14	14
#define	fr15	15
#define	fr16	16
#define	fr17	17
#define	fr18	18
#define	fr19	19
#define	fr20	20
#define	fr21	21
#define	fr22	22
#define	fr23	23
#define	fr24	24
#define	fr25	25
#define	fr26	26
#define	fr27	27
#define	fr28	28
#define	fr29	29
#define	fr30	30
#define	fr31	31

/* AltiVec Registers (VPRs) */

#define	v0	0
#define	v1	1
#define	v2	2
#define	v3	3
#define	v4	4
#define	v5	5
#define	v6	6
#define	v7	7
#define	v8	8
#define	v9	9
#define	v10	10
#define	v11	11
#define	v12	12
#define	v13	13
#define	v14	14
#define	v15	15
#define	v16	16
#define	v17	17
#define	v18	18
#define	v19	19
#define	v20	20
#define	v21	21
#define	v22	22
#define	v23	23
#define	v24	24
#define	v25	25
#define	v26	26
#define	v27	27
#define	v28	28
#define	v29	29
#define	v30	30
#define	v31	31

/* VSX Registers (VSRs) */

#define	vs0	0
#define	vs1	1
#define	vs2	2
#define	vs3	3
#define	vs4	4
#define	vs5	5
#define	vs6	6
#define	vs7	7
#define	vs8	8
#define	vs9	9
#define	vs10	10
#define	vs11	11
#define	vs12	12
#define	vs13	13
#define	vs14	14
#define	vs15	15
#define	vs16	16
#define	vs17	17
#define	vs18	18
#define	vs19	19
#define	vs20	20
#define	vs21	21
#define	vs22	22
#define	vs23	23
#define	vs24	24
#define	vs25	25
#define	vs26	26
#define	vs27	27
#define	vs28	28
#define	vs29	29
#define	vs30	30
#define	vs31	31
#define	vs32	32
#define	vs33	33
#define	vs34	34
#define	vs35	35
#define	vs36	36
#define	vs37	37
#define	vs38	38
#define	vs39	39
#define	vs40	40
#define	vs41	41
#define	vs42	42
#define	vs43	43
#define	vs44	44
#define	vs45	45
#define	vs46	46
#define	vs47	47
#define	vs48	48
#define	vs49	49
#define	vs50	50
#define	vs51	51
#define	vs52	52
#define	vs53	53
#define	vs54	54
#define	vs55	55
#define	vs56	56
#define	vs57	57
#define	vs58	58
#define	vs59	59
#define	vs60	60
#define	vs61	61
#define	vs62	62
#define	vs63	63

/* SPE Registers (EVPRs) */

#define	evr0	0
#define	evr1	1
#define	evr2	2
#define	evr3	3
#define	evr4	4
#define	evr5	5
#define	evr6	6
#define	evr7	7
#define	evr8	8
#define	evr9	9
#define	evr10	10
#define	evr11	11
#define	evr12	12
#define	evr13	13
#define	evr14	14
#define	evr15	15
#define	evr16	16
#define	evr17	17
#define	evr18	18
#define	evr19	19
#define	evr20	20
#define	evr21	21
#define	evr22	22
#define	evr23	23
#define	evr24	24
#define	evr25	25
#define	evr26	26
#define	evr27	27
#define	evr28	28
#define	evr29	29
#define	evr30	30
#define	evr31	31

#define RFSCV	.long 0x4c0000a4

/*
 * Create an endian fixup trampoline
 *
 * This starts with a "tdi 0,0,0x48" instruction which is
 * essentially a "trap never", and thus akin to a nop.
 *
 * The opcode for this instruction read with the wrong endian
 * however results in a b . + 8
 *
 * So essentially we use that trick to execute the following
 * trampoline in "reverse endian" if we are running with the
 * MSR_LE bit set the "wrong" way for whatever endianness the
 * kernel is built for.
 */

#ifdef CONFIG_PPC_BOOK3E_64
#define FIXUP_ENDIAN
#else
/*
 * This version may be used in HV or non-HV context.
 * MSR[EE] must be disabled.
 */
#define FIXUP_ENDIAN						   \
	tdi   0,0,0x48;	  /* Reverse endian of b . + 8		*/ \
	b     191f;	  /* Skip trampoline if endian is good	*/ \
	.long 0xa600607d; /* mfmsr r11				*/ \
	.long 0x01006b69; /* xori r11,r11,1			*/ \
	.long 0x00004039; /* li r10,0				*/ \
	.long 0x6401417d; /* mtmsrd r10,1			*/ \
	.long 0x05009f42; /* bcl 20,31,$+4			*/ \
	.long 0xa602487d; /* mflr r10				*/ \
	.long 0x14004a39; /* addi r10,r10,20			*/ \
	.long 0xa6035a7d; /* mtsrr0 r10				*/ \
	.long 0xa6037b7d; /* mtsrr1 r11				*/ \
	.long 0x2400004c; /* rfid				*/ \
191:

/*
 * This version that may only be used with MSR[HV]=1
 * - Does not clear MSR[RI], so more robust.
 * - Slightly smaller and faster.
 */
#define FIXUP_ENDIAN_HV						   \
	tdi   0,0,0x48;	  /* Reverse endian of b . + 8		*/ \
	b     191f;	  /* Skip trampoline if endian is good	*/ \
	.long 0xa600607d; /* mfmsr r11				*/ \
	.long 0x01006b69; /* xori r11,r11,1			*/ \
	.long 0x05009f42; /* bcl 20,31,$+4			*/ \
	.long 0xa602487d; /* mflr r10				*/ \
	.long 0x14004a39; /* addi r10,r10,20			*/ \
	.long 0xa64b5a7d; /* mthsrr0 r10			*/ \
	.long 0xa64b7b7d; /* mthsrr1 r11			*/ \
	.long 0x2402004c; /* hrfid				*/ \
191:

#endif /* !CONFIG_PPC_BOOK3E_64 */

#endif /*  __ASSEMBLY__ */

#define SOFT_MASK_TABLE(_start, _end)		\
	stringify_in_c(.section __soft_mask_table,"a";)\
	stringify_in_c(.balign 8;)		\
	stringify_in_c(.llong (_start);)	\
	stringify_in_c(.llong (_end);)		\
	stringify_in_c(.previous)

#define RESTART_TABLE(_start, _end, _target)	\
	stringify_in_c(.section __restart_table,"a";)\
	stringify_in_c(.balign 8;)		\
	stringify_in_c(.llong (_start);)	\
	stringify_in_c(.llong (_end);)		\
	stringify_in_c(.llong (_target);)	\
	stringify_in_c(.previous)

#ifdef CONFIG_PPC_E500
#define BTB_FLUSH(reg)			\
	lis reg,BUCSR_INIT@h;		\
	ori reg,reg,BUCSR_INIT@l;	\
	mtspr SPRN_BUCSR,reg;		\
	isync;
#else
#define BTB_FLUSH(reg)
#endif /* CONFIG_PPC_E500 */

#if defined(CONFIG_PPC64_ELF_ABI_V1)
#define STACK_FRAME_PARAMS 48
#elif defined(CONFIG_PPC64_ELF_ABI_V2)
#define STACK_FRAME_PARAMS 32
#elif defined(CONFIG_PPC32)
#define STACK_FRAME_PARAMS 8
#endif

#endif /* _ASM_POWERPC_PPC_ASM_H */