arch/powerpc/include/asm/processor.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ASM_POWERPC_PROCESSOR_H
#define _ASM_POWERPC_PROCESSOR_H

/*
 * Copyright (C) 2001 PPC 64 Team, IBM Corp
 */

#include <vdso/processor.h>

#include <asm/reg.h>

#ifdef CONFIG_VSX
#define TS_FPRWIDTH 2

#ifdef __BIG_ENDIAN__
#define TS_FPROFFSET 0
#define TS_VSRLOWOFFSET 1
#else
#define TS_FPROFFSET 1
#define TS_VSRLOWOFFSET 0
#endif

#else
#define TS_FPRWIDTH 1
#define TS_FPROFFSET 0
#endif

#ifdef CONFIG_PPC64
/* Default SMT priority is set to 3. Use 11- 13bits to save priority. */
#define PPR_PRIORITY 3
#ifdef __ASSEMBLY__
#define DEFAULT_PPR (PPR_PRIORITY << 50)
#else
#define DEFAULT_PPR ((u64)PPR_PRIORITY << 50)
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_PPC64 */

#ifndef __ASSEMBLY__
#include <linux/types.h>
#include <linux/thread_info.h>
#include <asm/ptrace.h>
#include <asm/hw_breakpoint.h>

/* We do _not_ want to define new machine types at all, those must die
 * in favor of using the device-tree
 * -- BenH.
 */

/* PREP sub-platform types. Unused */
#define _PREP_Motorola	0x01	/* motorola prep */
#define _PREP_Firm	0x02	/* firmworks prep */
#define _PREP_IBM	0x00	/* ibm prep */
#define _PREP_Bull	0x03	/* bull prep */

/* CHRP sub-platform types. These are arbitrary */
#define _CHRP_Motorola	0x04	/* motorola chrp, the cobra */
#define _CHRP_IBM	0x05	/* IBM chrp, the longtrail and longtrail 2 */
#define _CHRP_Pegasos	0x06	/* Genesi/bplan's Pegasos and Pegasos2 */
#define _CHRP_briq	0x07	/* TotalImpact's briQ */

#if defined(__KERNEL__) && defined(CONFIG_PPC32)

extern int _chrp_type;

#endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */

#ifdef __KERNEL__

#ifdef CONFIG_PPC64
#include <asm/task_size_64.h>
#else
#include <asm/task_size_32.h>
#endif

struct task_struct;
void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);

#define TS_FPR(i) fp_state.fpr[i][TS_FPROFFSET]
#define TS_CKFPR(i) ckfp_state.fpr[i][TS_FPROFFSET]

/* FP and VSX 0-31 register set */
struct thread_fp_state {
	u64	fpr[32][TS_FPRWIDTH] __attribute__((aligned(16)));
	u64	fpscr;		/* Floating point status */
};

/* Complete AltiVec register set including VSCR */
struct thread_vr_state {
	vector128	vr[32] __attribute__((aligned(16)));
	vector128	vscr __attribute__((aligned(16)));
};

struct debug_reg {
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
	/*
	 * The following help to manage the use of Debug Control Registers
	 * om the BookE platforms.
	 */
	uint32_t	dbcr0;
	uint32_t	dbcr1;
#ifdef CONFIG_BOOKE
	uint32_t	dbcr2;
#endif
	/*
	 * The stored value of the DBSR register will be the value at the
	 * last debug interrupt. This register can only be read from the
	 * user (will never be written to) and has value while helping to
	 * describe the reason for the last debug trap.  Torez
	 */
	uint32_t	dbsr;
	/*
	 * The following will contain addresses used by debug applications
	 * to help trace and trap on particular address locations.
	 * The bits in the Debug Control Registers above help define which
	 * of the following registers will contain valid data and/or addresses.
	 */
	unsigned long	iac1;
	unsigned long	iac2;
#if CONFIG_PPC_ADV_DEBUG_IACS > 2
	unsigned long	iac3;
	unsigned long	iac4;
#endif
	unsigned long	dac1;
	unsigned long	dac2;
#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
	unsigned long	dvc1;
	unsigned long	dvc2;
#endif
#endif
};

struct thread_struct {
	unsigned long	ksp;		/* Kernel stack pointer */

#ifdef CONFIG_PPC64
	unsigned long	ksp_vsid;
#endif
	struct pt_regs	*regs;		/* Pointer to saved register state */
#ifdef CONFIG_BOOKE
	/* BookE base exception scratch space; align on cacheline */
	unsigned long	normsave[8] ____cacheline_aligned;
#endif
#ifdef CONFIG_PPC32
	void		*pgdir;		/* root of page-table tree */
#ifdef CONFIG_PPC_RTAS
	unsigned long	rtas_sp;	/* stack pointer for when in RTAS */
#endif
#if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP)
	unsigned long	kuap;		/* opened segments for user access */
#endif
	unsigned long	srr0;
	unsigned long	srr1;
	unsigned long	dar;
	unsigned long	dsisr;
#ifdef CONFIG_PPC_BOOK3S_32
	unsigned long	r0, r3, r4, r5, r6, r8, r9, r11;
	unsigned long	lr, ctr;
	unsigned long	sr0;
#endif
#endif /* CONFIG_PPC32 */
#if defined(CONFIG_BOOKE_OR_40x) && defined(CONFIG_PPC_KUAP)
	unsigned long	pid;	/* value written in PID reg. at interrupt exit */
#endif
	/* Debug Registers */
	struct debug_reg debug;
#ifdef CONFIG_PPC_FPU_REGS
	struct thread_fp_state	fp_state;
	struct thread_fp_state	*fp_save_area;
#endif
	int		fpexc_mode;	/* floating-point exception mode */
	unsigned int	align_ctl;	/* alignment handling control */
#ifdef CONFIG_HAVE_HW_BREAKPOINT
	struct perf_event *ptrace_bps[HBP_NUM_MAX];
	/*
	 * Helps identify source of single-step exception and subsequent
	 * hw-breakpoint enablement
	 */
	struct perf_event *last_hit_ubp[HBP_NUM_MAX];
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
	struct arch_hw_breakpoint hw_brk[HBP_NUM_MAX]; /* hardware breakpoint info */
	unsigned long	trap_nr;	/* last trap # on this thread */
	u8 load_slb;			/* Ages out SLB preload cache entries */
	u8 load_fp;
#ifdef CONFIG_ALTIVEC
	u8 load_vec;
	struct thread_vr_state vr_state;
	struct thread_vr_state *vr_save_area;
	unsigned long	vrsave;
	int		used_vr;	/* set if process has used altivec */
#endif /* CONFIG_ALTIVEC */
#ifdef CONFIG_VSX
	/* VSR status */
	int		used_vsr;	/* set if process has used VSX */
#endif /* CONFIG_VSX */
#ifdef CONFIG_SPE
	struct_group(spe,
		unsigned long	evr[32];	/* upper 32-bits of SPE regs */
		u64		acc;		/* Accumulator */
	);
	unsigned long	spefscr;	/* SPE & eFP status */
	unsigned long	spefscr_last;	/* SPEFSCR value on last prctl
					   call or trap return */
	int		used_spe;	/* set if process has used spe */
#endif /* CONFIG_SPE */
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
	u8	load_tm;
	u64		tm_tfhar;	/* Transaction fail handler addr */
	u64		tm_texasr;	/* Transaction exception & summary */
	u64		tm_tfiar;	/* Transaction fail instr address reg */
	struct pt_regs	ckpt_regs;	/* Checkpointed registers */

	unsigned long	tm_tar;
	unsigned long	tm_ppr;
	unsigned long	tm_dscr;
	unsigned long   tm_amr;

	/*
	 * Checkpointed FP and VSX 0-31 register set.
	 *
	 * When a transaction is active/signalled/scheduled etc., *regs is the
	 * most recent set of/speculated GPRs with ckpt_regs being the older
	 * checkpointed regs to which we roll back if transaction aborts.
	 *
	 * These are analogous to how ckpt_regs and pt_regs work
	 */
	struct thread_fp_state ckfp_state; /* Checkpointed FP state */
	struct thread_vr_state ckvr_state; /* Checkpointed VR state */
	unsigned long	ckvrsave; /* Checkpointed VRSAVE */
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
	void*		kvm_shadow_vcpu; /* KVM internal data */
#endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
#if defined(CONFIG_KVM) && defined(CONFIG_BOOKE)
	struct kvm_vcpu	*kvm_vcpu;
#endif
#ifdef CONFIG_PPC64
	unsigned long	dscr;
	unsigned long	fscr;
	/*
	 * This member element dscr_inherit indicates that the process
	 * has explicitly attempted and changed the DSCR register value
	 * for itself. Hence kernel wont use the default CPU DSCR value
	 * contained in the PACA structure anymore during process context
	 * switch. Once this variable is set, this behaviour will also be
	 * inherited to all the children of this process from that point
	 * onwards.
	 */
	int		dscr_inherit;
	unsigned long	tidr;
#endif
#ifdef CONFIG_PPC_BOOK3S_64
	unsigned long	tar;
	unsigned long	ebbrr;
	unsigned long	ebbhr;
	unsigned long	bescr;
	unsigned long	siar;
	unsigned long	sdar;
	unsigned long	sier;
	unsigned long	mmcr2;
	unsigned 	mmcr0;

	unsigned 	used_ebb;
	unsigned long   mmcr3;
	unsigned long   sier2;
	unsigned long   sier3;

#endif
};

#define ARCH_MIN_TASKALIGN 16

#define INIT_SP		(sizeof(init_stack) + (unsigned long) &init_stack)
#define INIT_SP_LIMIT	((unsigned long)&init_stack)

#ifdef CONFIG_SPE
#define SPEFSCR_INIT \
	.spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, \
	.spefscr_last = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
#else
#define SPEFSCR_INIT
#endif

#ifdef CONFIG_PPC_BOOK3S_32
#define SR0_INIT	.sr0 = IS_ENABLED(CONFIG_PPC_KUEP) ? SR_NX : 0,
#else
#define SR0_INIT
#endif

#if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP)
#define INIT_THREAD { \
	.ksp = INIT_SP, \
	.pgdir = swapper_pg_dir, \
	.kuap = ~0UL, /* KUAP_NONE */ \
	.fpexc_mode = MSR_FE0 | MSR_FE1, \
	SPEFSCR_INIT \
	SR0_INIT \
}
#elif defined(CONFIG_PPC32)
#define INIT_THREAD { \
	.ksp = INIT_SP, \
	.pgdir = swapper_pg_dir, \
	.fpexc_mode = MSR_FE0 | MSR_FE1, \
	SPEFSCR_INIT \
	SR0_INIT \
}
#else
#define INIT_THREAD  { \
	.ksp = INIT_SP, \
	.fpexc_mode = 0, \
}
#endif

#define task_pt_regs(tsk)	((tsk)->thread.regs)

unsigned long __get_wchan(struct task_struct *p);

#define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
#define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)

/* Get/set floating-point exception mode */
#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))

extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);

#define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
#define SET_ENDIAN(tsk, val) set_endian((tsk), (val))

extern int get_endian(struct task_struct *tsk, unsigned long adr);
extern int set_endian(struct task_struct *tsk, unsigned int val);

#define GET_UNALIGN_CTL(tsk, adr)	get_unalign_ctl((tsk), (adr))
#define SET_UNALIGN_CTL(tsk, val)	set_unalign_ctl((tsk), (val))

extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);

extern void load_fp_state(struct thread_fp_state *fp);
extern void store_fp_state(struct thread_fp_state *fp);
extern void load_vr_state(struct thread_vr_state *vr);
extern void store_vr_state(struct thread_vr_state *vr);

static inline unsigned int __unpack_fe01(unsigned long msr_bits)
{
	return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
}

static inline unsigned long __pack_fe01(unsigned int fpmode)
{
	return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
}

#ifdef CONFIG_PPC64

#define spin_begin()							\
	asm volatile(ASM_FTR_IFCLR(					\
		"or 1,1,1", /* HMT_LOW */				\
		"nop", /* v3.1 uses pause_short in cpu_relax instead */	\
		%0) :: "i" (CPU_FTR_ARCH_31) : "memory")

#define spin_cpu_relax()						\
	asm volatile(ASM_FTR_IFCLR(					\
		"nop", /* Before v3.1 use priority nops in spin_begin/end */ \
		PPC_WAIT(2, 0),	/* aka pause_short */			\
		%0) :: "i" (CPU_FTR_ARCH_31) : "memory")

#define spin_end()							\
	asm volatile(ASM_FTR_IFCLR(					\
		"or 2,2,2", /* HMT_MEDIUM */				\
		"nop",							\
		%0) :: "i" (CPU_FTR_ARCH_31) : "memory")

#endif

/*
 * Check that a certain kernel stack pointer is a valid (minimum sized)
 * stack frame in task_struct p.
 */
int validate_sp(unsigned long sp, struct task_struct *p);

/*
 * validate the stack frame of a particular minimum size, used for when we are
 * looking at a certain object in the stack beyond the minimum.
 */
int validate_sp_size(unsigned long sp, struct task_struct *p,
		     unsigned long nbytes);

/*
 * Prefetch macros.
 */
#define ARCH_HAS_PREFETCH
#define ARCH_HAS_PREFETCHW
#define ARCH_HAS_SPINLOCK_PREFETCH

static inline void prefetch(const void *x)
{
	if (unlikely(!x))
		return;

	__asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
}

static inline void prefetchw(const void *x)
{
	if (unlikely(!x))
		return;

	__asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
}

#define spin_lock_prefetch(x)	prefetchw(x)

/* asm stubs */
extern unsigned long isa300_idle_stop_noloss(unsigned long psscr_val);
extern unsigned long isa300_idle_stop_mayloss(unsigned long psscr_val);
extern unsigned long isa206_idle_insn_mayloss(unsigned long type);
#ifdef CONFIG_PPC_970_NAP
extern void power4_idle_nap(void);
void power4_idle_nap_return(void);
#endif

extern unsigned long cpuidle_disable;
enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};

extern int powersave_nap;	/* set if nap mode can be used in idle loop */

extern void power7_idle_type(unsigned long type);
extern void arch300_idle_type(unsigned long stop_psscr_val,
			      unsigned long stop_psscr_mask);
void pnv_power9_force_smt4_catch(void);
void pnv_power9_force_smt4_release(void);

extern int fix_alignment(struct pt_regs *);

#ifdef CONFIG_PPC64
/*
 * We handle most unaligned accesses in hardware. On the other hand 
 * unaligned DMA can be very expensive on some ppc64 IO chips (it does
 * powers of 2 writes until it reaches sufficient alignment).
 *
 * Based on this we disable the IP header alignment in network drivers.
 */
#define NET_IP_ALIGN	0
#endif

int do_mathemu(struct pt_regs *regs);
int do_spe_mathemu(struct pt_regs *regs);
int speround_handler(struct pt_regs *regs);

/* VMX copying */
int enter_vmx_usercopy(void);
int exit_vmx_usercopy(void);
int enter_vmx_ops(void);
void *exit_vmx_ops(void *dest);

#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_PROCESSOR_H */