/* SPDX-License-Identifier: GPL-2.0 *//* * include/asm-parisc/processor.h * * Copyright (C) 1994 Linus Torvalds * Copyright (C) 2001 Grant Grundler */ #ifndef __ASM_PARISC_PROCESSOR_H#define __ASM_PARISC_PROCESSOR_H #ifndef __ASSEMBLY__#include <linux/threads.h> #include <asm/prefetch.h>#include <asm/hardware.h>#include <asm/pdc.h>#include <asm/ptrace.h>#include <asm/types.h>#include <asm/percpu.h>#endif /* __ASSEMBLY__ */ #define HAVE_ARCH_PICK_MMAP_LAYOUT #define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)#define TASK_SIZE	        TASK_SIZE_OF(current)#define TASK_UNMAPPED_BASE      (current->thread.map_base) #define DEFAULT_TASK_SIZE32	(0xFFF00000UL)#define DEFAULT_MAP_BASE32	(0x40000000UL) #ifdef CONFIG_64BIT#define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)#define DEFAULT_MAP_BASE        (0x200000000UL)#else#define DEFAULT_TASK_SIZE	DEFAULT_TASK_SIZE32#define DEFAULT_MAP_BASE	DEFAULT_MAP_BASE32#endif #ifdef __KERNEL__ /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc. * prumpf */ #define STACK_TOP	TASK_SIZE#define STACK_TOP_MAX	DEFAULT_TASK_SIZE /* Allow bigger stacks for 64-bit processes */#define STACK_SIZE_MAX	(USER_WIDE_MODE					\			 ? (1 << 30)	/* 1 GB */			\			 : (CONFIG_MAX_STACK_SIZE_MB*1024*1024)) #endif #ifndef __ASSEMBLY__ /* * Data detected about CPUs at boot time which is the same for all CPU's. * HP boxes are SMP - ie identical processors. * * FIXME: some CPU rev info may be processor specific... */struct system_cpuinfo_parisc {	unsigned int	cpu_count;	unsigned int	cpu_hz;	unsigned int	hversion;	unsigned int	sversion;	enum cpu_type	cpu_type; 	struct {		struct pdc_model model;		unsigned long versions;		unsigned long cpuid;		unsigned long capabilities;		char   sys_model_name[81]; /* PDC-ROM returnes this model name */	} pdc; 	const char	*cpu_name;	/* e.g. "PA7300LC (PCX-L2)" */	const char	*family_name;	/* e.g. "1.1e" */};  /* Per CPU data structure - ie varies per CPU.  */struct cpuinfo_parisc {	unsigned long it_value;     /* Interval Timer at last timer Intr */	unsigned long irq_count;    /* number of IRQ's since boot */	unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */	unsigned long hpa;          /* Host Physical address */	unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */#ifdef CONFIG_SMP	unsigned long pending_ipi;  /* bitmap of type ipi_message_type */#endif	unsigned long bh_count;     /* number of times bh was invoked */	unsigned long fp_rev;	unsigned long fp_model;	unsigned long cpu_num;      /* CPU number from PAT firmware */	unsigned long cpu_loc;      /* CPU location from PAT firmware */	unsigned int state;	struct parisc_device *dev;	unsigned long loops_per_jiffy;}; extern struct system_cpuinfo_parisc boot_cpu_data;DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data); #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF) typedef struct {	int seg;  } mm_segment_t; #define ARCH_MIN_TASKALIGN	8 struct thread_struct {	struct pt_regs regs;	unsigned long  task_size;	unsigned long  map_base;	unsigned long  flags;};  #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs)) /* Thread struct flags. */#define PARISC_UAC_NOPRINT	(1UL << 0)	/* see prctl and unaligned.c */#define PARISC_UAC_SIGBUS	(1UL << 1)#define PARISC_KERNEL_DEATH	(1UL << 31)	/* see die_if_kernel()... */ #define PARISC_UAC_SHIFT	0#define PARISC_UAC_MASK		(PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS) #define SET_UNALIGN_CTL(task,value)                                       \        ({                                                                \        (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \                                | (((value) << PARISC_UAC_SHIFT) &        \                                   PARISC_UAC_MASK));                     \        0;                                                                \        }) #define GET_UNALIGN_CTL(task,addr)                                        \        ({                                                                \        put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \                 >> PARISC_UAC_SHIFT, (int __user *) (addr));             \        }) #define INIT_THREAD { \	.regs = {	.gr	= { 0, }, \			.fr	= { 0, }, \			.sr	= { 0, }, \			.iasq	= { 0, }, \			.iaoq	= { 0, }, \			.cr27	= 0, \		}, \	.task_size	= DEFAULT_TASK_SIZE, \	.map_base	= DEFAULT_MAP_BASE, \	.flags		= 0 \	} struct task_struct;void show_trace(struct task_struct *task, unsigned long *stack); /* * Start user thread in another space. * * Note that we set both the iaoq and r31 to the new pc. When * the kernel initially calls execve it will return through an * rfi path that will use the values in the iaoq. The execve * syscall path will return through the gateway page, and * that uses r31 to branch to. * * For ELF we clear r23, because the dynamic linker uses it to pass * the address of the finalizer function. * * We also initialize sr3 to an illegal value (illegal for our * implementation, not for the architecture). */typedef unsigned int elf_caddr_t; /* The ELF abi wants things done a "wee bit" differently than * som does.  Supporting this behavior here avoids * having our own version of create_elf_tables. * * Oh, and yes, that is not a typo, we are really passing argc in r25 * and argv in r24 (rather than r26 and r25).  This is because that's * where __libc_start_main wants them. * * Duplicated from dl-machine.h for the benefit of readers: * *  Our initial stack layout is rather different from everyone else's *  due to the unique PA-RISC ABI.  As far as I know it looks like *  this:    -----------------------------------  (user startup code creates this frame)   |         32 bytes of magic       |   |---------------------------------|   | 32 bytes argument/sp save area  |   |---------------------------------| (bprm->p)   |	    ELF auxiliary info	     |   |         (up to 28 words)        |   |---------------------------------|   |		   NULL		     |   |---------------------------------|   |	   Environment pointers	     |   |---------------------------------|   |		   NULL		     |   |---------------------------------|   |        Argument pointers        |   |---------------------------------| <- argv   |          argc (1 word)          |   |---------------------------------| <- bprm->exec (HACK!)   |         N bytes of slack        |   |---------------------------------|   |	filename passed to execve    |   |---------------------------------| (mm->env_end)   |           env strings           |   |---------------------------------| (mm->env_start, mm->arg_end)   |           arg strings           |   |---------------------------------|   | additional faked arg strings if |   | we're invoked via binfmt_script |   |---------------------------------| (mm->arg_start)   stack base is at TASK_SIZE - rlim_max. on downward growing arches, it looks like this:   stack base at TASK_SIZE   | filename passed to execve   | env strings   | arg strings   | faked arg strings   | slack   | ELF   | envps   | argvs   | argc  *  The pleasant part of this is that if we need to skip arguments we *  can just decrement argc and move argv, because the stack pointer *  is utterly unrelated to the location of the environment and *  argument vectors. * * Note that the S/390 people took the easy way out and hacked their * GCC to make the stack grow downwards. * * Final Note: For entry from syscall, the W (wide) bit of the PSW * is stuffed into the lowest bit of the user sp (%r30), so we fill * it in here from the current->personality */ #define USER_WIDE_MODE	(!is_32bit_task()) #define start_thread(regs, new_pc, new_sp) do {		\	elf_addr_t *sp = (elf_addr_t *)new_sp;		\	__u32 spaceid = (__u32)current->mm->context;	\	elf_addr_t pc = (elf_addr_t)new_pc | 3;		\	elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;	\							\	regs->iasq[0] = spaceid;			\	regs->iasq[1] = spaceid;			\	regs->iaoq[0] = pc;				\	regs->iaoq[1] = pc + 4;                         \	regs->sr[2] = LINUX_GATEWAY_SPACE;              \	regs->sr[3] = 0xffff;				\	regs->sr[4] = spaceid;				\	regs->sr[5] = spaceid;				\	regs->sr[6] = spaceid;				\	regs->sr[7] = spaceid;				\	regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \	regs->fr[ 0] = 0LL;                            	\	regs->fr[ 1] = 0LL;                            	\	regs->fr[ 2] = 0LL;                            	\	regs->fr[ 3] = 0LL;                            	\	regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \	regs->gr[31] = pc;				\							\	get_user(regs->gr[25], (argv - 1));		\	regs->gr[24] = (long) argv;			\	regs->gr[23] = 0;				\} while(0) struct task_struct;struct mm_struct; /* Free all resources held by a thread. */extern void release_thread(struct task_struct *); extern unsigned long get_wchan(struct task_struct *p); #define KSTK_EIP(tsk)	((tsk)->thread.regs.iaoq[0])#define KSTK_ESP(tsk)	((tsk)->thread.regs.gr[30]) #define cpu_relax()	barrier() /* * parisc_requires_coherency() is used to identify the combined VIPT/PIPT * cached CPUs which require a guarantee of coherency (no inequivalent aliases * with different data, whether clean or not) to operate */#ifdef CONFIG_PA8X00extern int _parisc_requires_coherency;#define parisc_requires_coherency()	_parisc_requires_coherency#else#define parisc_requires_coherency()	(0)#endif extern int running_on_qemu; #endif /* __ASSEMBLY__ */ #endif /* __ASM_PARISC_PROCESSOR_H */