include/asm-parisc/processor.h - pub/scm/linux/kernel/git/davem/netdev-vger-cvs - Git at Google

 /*
  * include/asm-parisc/processor.h
  *
  * Copyright (C) 1994 Linus Torvalds
  */

 #ifndef __ASM_PARISC_PROCESSOR_H
 #define __ASM_PARISC_PROCESSOR_H

 #ifndef __ASSEMBLY__
 #include <linux/threads.h>

 #include <asm/hardware.h>
 #include <asm/page.h>
 #include <asm/pdc.h>
 #include <asm/ptrace.h>
 #include <asm/types.h>
 #endif /* __ASSEMBLY__ */

 /*
  * Default implementation of macro that returns current
  * instruction pointer ("program counter").
  */

 /* We cannot use MFIA as it was added for PA2.0 - prumpf

    At one point there were no "0f/0b" type local symbols in gas for
    PA-RISC.  This is no longer true, but this still seems like the
    nicest way to implement this. */

 #define current_text_addr() ({ void *pc; __asm__("\n\tblr 0,%0\n\tnop":"=r" (pc)); pc; })

 #define TASK_SIZE	    (PAGE_OFFSET)
 #define TASK_UNMAPPED_BASE  (TASK_SIZE / 3)

 #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;
 		struct pdc_model_cpuid /* ARGH */ versions;
 		struct pdc_model_cpuid cpuid;
 #if 0
 		struct pdc_model_caps caps;
 #endif
 		char   sys_model_name[81]; /* PDC-ROM returnes this model name */
 	} pdc;

 	char	 	*model_name;
 	char		*cpu_name;
 	char		*family_name;
 };


 /*
 ** Per CPU data structure - ie varies per CPU.
 */
 struct cpuinfo_parisc {
 	unsigned cpuid;

 	struct irq_region *region;

 	unsigned long it_value; /* Interval Timer value at last timer interrupt */
 	unsigned long it_delta; /* Interval Timer delta (tic_10ms / HZ * 100) */

 	unsigned long hpa;	/* Host Physical address */
 	unsigned long txn_addr;	/* External Interrupt Register or id_eid */

 	unsigned long bh_count;		/* number of times bh was invoked */
 	unsigned long irq_count;	/* number of IRQ's since boot */
 	unsigned long irq_max_cr16;	/* longest time to handle a single IRQ */
 };

 extern struct system_cpuinfo_parisc boot_cpu_data;
 extern struct cpuinfo_parisc cpu_data[NR_CPUS];
 #define current_cpu_data cpu_data[smp_processor_id()]

 extern void identify_cpu(struct cpuinfo_parisc *);

 #define EISA_bus 0 /* we don't have ISA support yet */
 #define EISA_bus__is_a_macro /* for versions in ksyms.c */
 #define MCA_bus 0
 #define MCA_bus__is_a_macro /* for versions in ksyms.c */

 typedef struct {
 	int seg;
 } mm_segment_t;

 struct thread_struct {
 	struct pt_regs regs;
 	unsigned long  pg_tables;
 	unsigned long  flags;
 };

 /* Thread struct flags. */
 #define PARISC_KERNEL_DEATH	(1UL << 31)	/* see die_if_kernel()... */

 #define INIT_THREAD { {			\
 	{ 0, 0, 0, 0, 0, 0, 0, 0,	\
 	  0, 0, 0, 0, 0, 0, 0, 0,	\
 	  0, 0, 0, 0, 0, 0, 0, 0,	\
 	  0, 0, 0, 0, 0, 0, 0, 0 },	\
 	{ 0, 0, 0, 0, 0, 0, 0, 0,	\
 	  0, 0, 0, 0, 0, 0, 0, 0,	\
 	  0, 0, 0, 0, 0, 0, 0, 0,	\
 	  0, 0, 0, 0, 0, 0, 0, 0 },	\
 	{ 0, 0, 0, 0, 0, 0, 0, 0 },	\
 	{ 0, 0}, { 0, 0}, 0, 0, 0, 0	\
 	}, __pa((unsigned long) swapper_pg_dir) }

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

 extern inline unsigned long thread_saved_pc(struct thread_struct *t)
 {
 	return 0xabcdef;
 }

 /*
  * 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).
  */

 /* 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  |
    |---------------------------------|  ((current->mm->env_end) + 63 & ~63)
    |         N bytes of slack        |
    |---------------------------------|
    |      envvar and arg strings     |
    |---------------------------------|
    |	    ELF auxiliary info	     |
    |         (up to 28 words)        |
    |---------------------------------|
    |  Environment variable pointers  |
    |         upwards to NULL	     |
    |---------------------------------|
    |        Argument pointers        |
    |         upwards to NULL	     |
    |---------------------------------|
    |          argc (1 word)          |
    -----------------------------------

  *  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.  */

 #define start_thread_som(regs, new_pc, new_sp) do {		\
 	unsigned long *sp = (unsigned long *)new_sp;	\
 	__u32 spaceid = (__u32)current->mm->context;	\
 	unsigned long pc = (unsigned long)new_pc;	\
 	/* offset pc for priv. level */			\
 	pc |= 3;					\
 							\
 	set_fs(USER_DS);				\
 	regs->iasq[0] = spaceid;			\
 	regs->iasq[1] = spaceid;			\
 	regs->iaoq[0] = pc;				\
 	regs->iaoq[1] = pc;				\
 	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_INIT_PSW;			\
 	regs->gr[30] = ((new_sp)+63)&~63;		\
 	regs->gr[31] = pc;				\
 							\
 	get_user(regs->gr[26],&sp[0]);			\
 	get_user(regs->gr[25],&sp[-1]); 		\
 	get_user(regs->gr[24],&sp[-2]); 		\
 	get_user(regs->gr[23],&sp[-3]); 		\
 							\
 	regs->cr30 = (u32) current;			\
 } while(0)


 #define start_thread(regs, new_pc, new_sp) do {		\
 	unsigned long *sp = (unsigned long *)new_sp;	\
 	__u32 spaceid = (__u32)current->mm->context;	\
         unsigned long pc = (unsigned long)new_pc;       \
         /* offset pc for priv. level */                 \
         pc |= 3;                                        \
 							\
 							\
 	set_fs(USER_DS);				\
 	regs->iasq[0] = spaceid;			\
 	regs->iasq[1] = spaceid;			\
 	regs->iaoq[0] = pc;				\
 	regs->iaoq[1] = pc; 	               		\
 	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_INIT_PSW;			\
 	regs->fr[ 0] = 0LL;                            	\
 	regs->fr[ 1] = 0LL;                            	\
 	regs->fr[ 2] = 0LL;                            	\
 	regs->fr[ 3] = 0LL;                            	\
 	regs->gr[30] = ((current->mm->env_end)+63)&~63;	\
 	regs->gr[31] = pc;				\
 							\
 	get_user(regs->gr[25],&sp[0]);			\
 	regs->gr[24] = (unsigned long) &sp[1];		\
 	regs->gr[23] = 0;                            	\
 							\
 	regs->cr30 = (u32) current;			\
 } while(0)

 #ifdef __LP64__

 /*
  * For 64 bit kernels we need a version of start thread for 32 bit
  * elf files.
  *
  * FIXME: It should be possible to not duplicate the above code
  *        by playing games with concatenation to form both
  *        macros at compile time. The only difference between
  *        this macro and the above is the name and the types
  *        for sp and pc.
  */

 #define start_thread32(regs, new_pc, new_sp) do {         \
 	__u32 *sp = (__u32 *)new_sp;                    \
 	__u32 spaceid = (__u32)current->mm->context;	\
 	__u32 pc = (__u32)new_pc;                       \
         /* offset pc for priv. level */                 \
         pc |= 3;                                        \
 							\
 	set_fs(USER_DS);				\
 	regs->iasq[0] = spaceid;			\
 	regs->iasq[1] = spaceid;			\
 	regs->iaoq[0] = pc;				\
 	regs->iaoq[1] = pc; 	               		\
 	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_INIT_PSW;			\
 	regs->fr[ 0] = 0LL;                            	\
 	regs->fr[ 1] = 0LL;                            	\
 	regs->fr[ 2] = 0LL;                            	\
 	regs->fr[ 3] = 0LL;                            	\
 	regs->gr[30] = ((current->mm->env_end)+63)&~63;	\
 	regs->gr[31] = pc;				\
 							\
 	get_user(regs->gr[25],&sp[0]);			\
 	regs->gr[24] = (unsigned long) &sp[1];		\
 	regs->gr[23] = 0;                            	\
 							\
 	regs->cr30 = (u32) current;			\
 } while(0)

 #endif

 struct task_struct;

 /* Free all resources held by a thread. */
 extern void release_thread(struct task_struct *);
 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

 #define copy_segments(tsk, mm)	do { } while (0)
 #define release_segments(mm)	do { } while (0)

 extern inline unsigned long get_wchan(struct task_struct *p)
 {
 	return 0xdeadbeef; /* XXX */
 }

 #define KSTK_EIP(tsk)	(0xdeadbeef)
 #define KSTK_ESP(tsk)	(0xdeadbeef)

 /* Be sure to hunt all references to this down when you change the size of
  * the kernel stack */

 #endif /* __ASSEMBLY__ */

 #define THREAD_SIZE	(4*PAGE_SIZE)

 #define alloc_task_struct() \
 	((struct task_struct *) __get_free_pages(GFP_KERNEL,2))
 #define free_task_struct(p)     free_pages((unsigned long)(p),2)
 #define get_task_struct(tsk)      atomic_inc(&virt_to_page(tsk)->count)

 #define init_task (init_task_union.task)
 #define init_stack (init_task_union.stack)

 #define cpu_relax()	do { } while (0)


 #endif /* __ASM_PARISC_PROCESSOR_H */
	/*
	* include/asm-parisc/processor.h
	*
	* Copyright (C) 1994 Linus Torvalds
	*/

	#ifndef __ASM_PARISC_PROCESSOR_H
	#define __ASM_PARISC_PROCESSOR_H

	#ifndef __ASSEMBLY__
	#include <linux/threads.h>

	#include <asm/hardware.h>
	#include <asm/page.h>
	#include <asm/pdc.h>
	#include <asm/ptrace.h>
	#include <asm/types.h>
	#endif /* __ASSEMBLY__ */

	/*
	* Default implementation of macro that returns current
	* instruction pointer ("program counter").
	*/

	/* We cannot use MFIA as it was added for PA2.0 - prumpf

	At one point there were no "0f/0b" type local symbols in gas for
	PA-RISC. This is no longer true, but this still seems like the
	nicest way to implement this. */

	#define current_text_addr() ({ void *pc; __asm__("\n\tblr 0,%0\n\tnop":"=r" (pc)); pc; })

	#define TASK_SIZE (PAGE_OFFSET)
	#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)

	#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;
	struct pdc_model_cpuid /* ARGH */ versions;
	struct pdc_model_cpuid cpuid;
	#if 0
	struct pdc_model_caps caps;
	#endif
	char sys_model_name[81]; /* PDC-ROM returnes this model name */
	} pdc;

	char *model_name;
	char *cpu_name;
	char *family_name;
	};


	/*
	** Per CPU data structure - ie varies per CPU.
	*/
	struct cpuinfo_parisc {
	unsigned cpuid;

	struct irq_region *region;

	unsigned long it_value; /* Interval Timer value at last timer interrupt */
	unsigned long it_delta; /* Interval Timer delta (tic_10ms / HZ * 100) */

	unsigned long hpa; /* Host Physical address */
	unsigned long txn_addr; /* External Interrupt Register or id_eid */

	unsigned long bh_count; /* number of times bh was invoked */
	unsigned long irq_count; /* number of IRQ's since boot */
	unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
	};

	extern struct system_cpuinfo_parisc boot_cpu_data;
	extern struct cpuinfo_parisc cpu_data[NR_CPUS];
	#define current_cpu_data cpu_data[smp_processor_id()]

	extern void identify_cpu(struct cpuinfo_parisc *);

	#define EISA_bus 0 /* we don't have ISA support yet */
	#define EISA_bus__is_a_macro /* for versions in ksyms.c */
	#define MCA_bus 0
	#define MCA_bus__is_a_macro /* for versions in ksyms.c */

	typedef struct {
	int seg;
	} mm_segment_t;

	struct thread_struct {
	struct pt_regs regs;
	unsigned long pg_tables;
	unsigned long flags;
	};

	/* Thread struct flags. */
	#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */

	#define INIT_THREAD { { \
	{ 0, 0, 0, 0, 0, 0, 0, 0, \
	0, 0, 0, 0, 0, 0, 0, 0, \
	0, 0, 0, 0, 0, 0, 0, 0, \
	0, 0, 0, 0, 0, 0, 0, 0 }, \
	{ 0, 0, 0, 0, 0, 0, 0, 0, \
	0, 0, 0, 0, 0, 0, 0, 0, \
	0, 0, 0, 0, 0, 0, 0, 0, \
	0, 0, 0, 0, 0, 0, 0, 0 }, \
	{ 0, 0, 0, 0, 0, 0, 0, 0 }, \
	{ 0, 0}, { 0, 0}, 0, 0, 0, 0 \
	}, __pa((unsigned long) swapper_pg_dir) }

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

	extern inline unsigned long thread_saved_pc(struct thread_struct *t)
	{
	return 0xabcdef;
	}

	/*
	* 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).
	*/

	/* 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 \|
	\|---------------------------------\| ((current->mm->env_end) + 63 & ~63)
	\| N bytes of slack \|
	\|---------------------------------\|
	\| envvar and arg strings \|
	\|---------------------------------\|
	\| ELF auxiliary info \|
	\| (up to 28 words) \|
	\|---------------------------------\|
	\| Environment variable pointers \|
	\| upwards to NULL \|
	\|---------------------------------\|
	\| Argument pointers \|
	\| upwards to NULL \|
	\|---------------------------------\|
	\| argc (1 word) \|
	-----------------------------------

	* 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. */

	#define start_thread_som(regs, new_pc, new_sp) do { \
	unsigned long sp = (unsigned long )new_sp; \
	__u32 spaceid = (__u32)current->mm->context; \
	unsigned long pc = (unsigned long)new_pc; \
	/* offset pc for priv. level */ \
	pc \|= 3; \
	\
	set_fs(USER_DS); \
	regs->iasq[0] = spaceid; \
	regs->iasq[1] = spaceid; \
	regs->iaoq[0] = pc; \
	regs->iaoq[1] = pc; \
	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_INIT_PSW; \
	regs->gr[30] = ((new_sp)+63)&~63; \
	regs->gr[31] = pc; \
	\
	get_user(regs->gr[26],&sp[0]); \
	get_user(regs->gr[25],&sp[-1]); \
	get_user(regs->gr[24],&sp[-2]); \
	get_user(regs->gr[23],&sp[-3]); \
	\
	regs->cr30 = (u32) current; \
	} while(0)


	#define start_thread(regs, new_pc, new_sp) do { \
	unsigned long sp = (unsigned long )new_sp; \
	__u32 spaceid = (__u32)current->mm->context; \
	unsigned long pc = (unsigned long)new_pc; \
	/* offset pc for priv. level */ \
	pc \|= 3; \
	\
	\
	set_fs(USER_DS); \
	regs->iasq[0] = spaceid; \
	regs->iasq[1] = spaceid; \
	regs->iaoq[0] = pc; \
	regs->iaoq[1] = pc; \
	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_INIT_PSW; \
	regs->fr[ 0] = 0LL; \
	regs->fr[ 1] = 0LL; \
	regs->fr[ 2] = 0LL; \
	regs->fr[ 3] = 0LL; \
	regs->gr[30] = ((current->mm->env_end)+63)&~63; \
	regs->gr[31] = pc; \
	\
	get_user(regs->gr[25],&sp[0]); \
	regs->gr[24] = (unsigned long) &sp[1]; \
	regs->gr[23] = 0; \
	\
	regs->cr30 = (u32) current; \
	} while(0)

	#ifdef __LP64__

	/*
	* For 64 bit kernels we need a version of start thread for 32 bit
	* elf files.
	*
	* FIXME: It should be possible to not duplicate the above code
	* by playing games with concatenation to form both
	* macros at compile time. The only difference between
	* this macro and the above is the name and the types
	* for sp and pc.
	*/

	#define start_thread32(regs, new_pc, new_sp) do { \
	__u32 sp = (__u32 )new_sp; \
	__u32 spaceid = (__u32)current->mm->context; \
	__u32 pc = (__u32)new_pc; \
	/* offset pc for priv. level */ \
	pc \|= 3; \
	\
	set_fs(USER_DS); \
	regs->iasq[0] = spaceid; \
	regs->iasq[1] = spaceid; \
	regs->iaoq[0] = pc; \
	regs->iaoq[1] = pc; \
	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_INIT_PSW; \
	regs->fr[ 0] = 0LL; \
	regs->fr[ 1] = 0LL; \
	regs->fr[ 2] = 0LL; \
	regs->fr[ 3] = 0LL; \
	regs->gr[30] = ((current->mm->env_end)+63)&~63; \
	regs->gr[31] = pc; \
	\
	get_user(regs->gr[25],&sp[0]); \
	regs->gr[24] = (unsigned long) &sp[1]; \
	regs->gr[23] = 0; \
	\
	regs->cr30 = (u32) current; \
	} while(0)

	#endif

	struct task_struct;

	/* Free all resources held by a thread. */
	extern void release_thread(struct task_struct *);
	extern int kernel_thread(int (fn)(void ), void * arg, unsigned long flags);

	#define copy_segments(tsk, mm) do { } while (0)
	#define release_segments(mm) do { } while (0)

	extern inline unsigned long get_wchan(struct task_struct *p)
	{
	return 0xdeadbeef; /* XXX */
	}

	#define KSTK_EIP(tsk) (0xdeadbeef)
	#define KSTK_ESP(tsk) (0xdeadbeef)

	/* Be sure to hunt all references to this down when you change the size of
	* the kernel stack */

	#endif /* __ASSEMBLY__ */

	#define THREAD_SIZE (4*PAGE_SIZE)

	#define alloc_task_struct() \
	((struct task_struct *) __get_free_pages(GFP_KERNEL,2))
	#define free_task_struct(p) free_pages((unsigned long)(p),2)
	#define get_task_struct(tsk) atomic_inc(&virt_to_page(tsk)->count)

	#define init_task (init_task_union.task)
	#define init_stack (init_task_union.stack)

	#define cpu_relax() do { } while (0)


	#endif /* __ASM_PARISC_PROCESSOR_H */