arch/parisc/include/asm/processor.h - linux - Git at Google


            
            /*

            
             * 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__ */


            /*

            
             * Default implementation of macro that returns current

            
             * instruction pointer ("program counter").

            
             */

            
            #ifdef CONFIG_PA20

            
            #define current_ia(x)	__asm__("mfia %0" : "=r"(x))

            
            #else /* mfia added in pa2.0 */

            
            #define current_ia(x)	__asm__("blr 0,%0\n\tnop" : "=r"(x))

            
            #endif

            
            #define current_text_addr() ({ void *pc; current_ia(pc); pc; })


            #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 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 \

            
            	}


            /*

            
             * Return saved PC of a blocked thread.  This is used by ps mostly.

            
             */


            struct task_struct;

            
            unsigned long thread_saved_pc(struct task_struct *t);

            
            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

            
             */


            #ifdef CONFIG_64BIT

            
            #define USER_WIDE_MODE	(!test_thread_flag(TIF_32BIT))

            
            #else

            
            #define USER_WIDE_MODE	0

            
            #endif


            #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_PA8X00

            
            extern int _parisc_requires_coherency;

            
            #define parisc_requires_coherency()	_parisc_requires_coherency

            
            #else

            
            #define parisc_requires_coherency()	(0)

            
            #endif


            #endif /* __ASSEMBLY__ */


            #endif /* __ASM_PARISC_PROCESSOR_H */
	/*
	* 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__ */

	/*
	* Default implementation of macro that returns current
	* instruction pointer ("program counter").
	*/
	#ifdef CONFIG_PA20
	#define current_ia(x) __asm__("mfia %0" : "=r"(x))
	#else /* mfia added in pa2.0 */
	#define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x))
	#endif
	#define current_text_addr() ({ void *pc; current_ia(pc); pc; })

	#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_MB10241024))

	#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 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 \
	}

	/*
	* Return saved PC of a blocked thread. This is used by ps mostly.
	*/

	struct task_struct;
	unsigned long thread_saved_pc(struct task_struct *t);
	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
	*/

	#ifdef CONFIG_64BIT
	#define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
	#else
	#define USER_WIDE_MODE 0
	#endif

	#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_PA8X00
	extern int _parisc_requires_coherency;
	#define parisc_requires_coherency() _parisc_requires_coherency
	#else
	#define parisc_requires_coherency() (0)
	#endif

	#endif /* __ASSEMBLY__ */

	#endif /* __ASM_PARISC_PROCESSOR_H */