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/*
* 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 */
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