331 lines
10 KiB
C
331 lines
10 KiB
C
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/*
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* include/asm-parisc/processor.h
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*
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* Copyright (C) 1994 Linus Torvalds
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* Copyright (C) 2001 Grant Grundler
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*/
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#ifndef __ASM_PARISC_PROCESSOR_H
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#define __ASM_PARISC_PROCESSOR_H
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#ifndef __ASSEMBLY__
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#include <linux/threads.h>
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#include <asm/prefetch.h>
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#include <asm/hardware.h>
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#include <asm/pdc.h>
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#include <asm/ptrace.h>
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#include <asm/types.h>
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#include <asm/percpu.h>
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#endif /* __ASSEMBLY__ */
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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#ifdef CONFIG_PA20
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#define current_ia(x) __asm__("mfia %0" : "=r"(x))
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#else /* mfia added in pa2.0 */
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#define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x))
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#endif
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#define current_text_addr() ({ void *pc; current_ia(pc); pc; })
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#define HAVE_ARCH_PICK_MMAP_LAYOUT
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#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size)
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#define TASK_SIZE TASK_SIZE_OF(current)
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#define TASK_UNMAPPED_BASE (current->thread.map_base)
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#define DEFAULT_TASK_SIZE32 (0xFFF00000UL)
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#define DEFAULT_MAP_BASE32 (0x40000000UL)
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#ifdef CONFIG_64BIT
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#define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000)
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#define DEFAULT_MAP_BASE (0x200000000UL)
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#else
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#define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32
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#define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32
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#endif
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#ifdef __KERNEL__
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/* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
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* prumpf */
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#define STACK_TOP TASK_SIZE
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#define STACK_TOP_MAX DEFAULT_TASK_SIZE
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/* Allow bigger stacks for 64-bit processes */
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#define STACK_SIZE_MAX (USER_WIDE_MODE \
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? (1 << 30) /* 1 GB */ \
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: (CONFIG_MAX_STACK_SIZE_MB*1024*1024))
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#endif
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#ifndef __ASSEMBLY__
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/*
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* Data detected about CPUs at boot time which is the same for all CPU's.
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* HP boxes are SMP - ie identical processors.
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*
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* FIXME: some CPU rev info may be processor specific...
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*/
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struct system_cpuinfo_parisc {
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unsigned int cpu_count;
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unsigned int cpu_hz;
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unsigned int hversion;
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unsigned int sversion;
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enum cpu_type cpu_type;
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struct {
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struct pdc_model model;
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unsigned long versions;
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unsigned long cpuid;
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unsigned long capabilities;
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char sys_model_name[81]; /* PDC-ROM returnes this model name */
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} pdc;
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const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */
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const char *family_name; /* e.g. "1.1e" */
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};
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/* Per CPU data structure - ie varies per CPU. */
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struct cpuinfo_parisc {
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unsigned long it_value; /* Interval Timer at last timer Intr */
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unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */
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unsigned long irq_count; /* number of IRQ's since boot */
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unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
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unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */
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unsigned long hpa; /* Host Physical address */
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unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
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#ifdef CONFIG_SMP
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unsigned long pending_ipi; /* bitmap of type ipi_message_type */
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#endif
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unsigned long bh_count; /* number of times bh was invoked */
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unsigned long prof_counter; /* per CPU profiling support */
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unsigned long prof_multiplier; /* per CPU profiling support */
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unsigned long fp_rev;
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unsigned long fp_model;
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unsigned int state;
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struct parisc_device *dev;
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unsigned long loops_per_jiffy;
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};
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extern struct system_cpuinfo_parisc boot_cpu_data;
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DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
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#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
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typedef struct {
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int seg;
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} mm_segment_t;
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#define ARCH_MIN_TASKALIGN 8
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struct thread_struct {
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struct pt_regs regs;
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unsigned long task_size;
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unsigned long map_base;
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unsigned long flags;
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};
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#define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
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/* Thread struct flags. */
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#define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */
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#define PARISC_UAC_SIGBUS (1UL << 1)
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#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */
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#define PARISC_UAC_SHIFT 0
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#define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
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#define SET_UNALIGN_CTL(task,value) \
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({ \
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(task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
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| (((value) << PARISC_UAC_SHIFT) & \
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PARISC_UAC_MASK)); \
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0; \
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})
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#define GET_UNALIGN_CTL(task,addr) \
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({ \
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put_user(((task)->thread.flags & PARISC_UAC_MASK) \
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>> PARISC_UAC_SHIFT, (int __user *) (addr)); \
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})
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#define INIT_THREAD { \
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.regs = { .gr = { 0, }, \
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.fr = { 0, }, \
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.sr = { 0, }, \
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.iasq = { 0, }, \
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.iaoq = { 0, }, \
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.cr27 = 0, \
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}, \
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.task_size = DEFAULT_TASK_SIZE, \
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.map_base = DEFAULT_MAP_BASE, \
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.flags = 0 \
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}
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/*
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* Return saved PC of a blocked thread. This is used by ps mostly.
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*/
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struct task_struct;
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unsigned long thread_saved_pc(struct task_struct *t);
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void show_trace(struct task_struct *task, unsigned long *stack);
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/*
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* Start user thread in another space.
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*
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* Note that we set both the iaoq and r31 to the new pc. When
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* the kernel initially calls execve it will return through an
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* rfi path that will use the values in the iaoq. The execve
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* syscall path will return through the gateway page, and
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* that uses r31 to branch to.
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*
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* For ELF we clear r23, because the dynamic linker uses it to pass
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* the address of the finalizer function.
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*
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* We also initialize sr3 to an illegal value (illegal for our
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* implementation, not for the architecture).
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*/
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typedef unsigned int elf_caddr_t;
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/* The ELF abi wants things done a "wee bit" differently than
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* som does. Supporting this behavior here avoids
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* having our own version of create_elf_tables.
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*
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* Oh, and yes, that is not a typo, we are really passing argc in r25
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* and argv in r24 (rather than r26 and r25). This is because that's
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* where __libc_start_main wants them.
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*
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* Duplicated from dl-machine.h for the benefit of readers:
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*
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* Our initial stack layout is rather different from everyone else's
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* due to the unique PA-RISC ABI. As far as I know it looks like
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* this:
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----------------------------------- (user startup code creates this frame)
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| 32 bytes of magic |
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|---------------------------------|
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| 32 bytes argument/sp save area |
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|---------------------------------| (bprm->p)
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| ELF auxiliary info |
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| (up to 28 words) |
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|---------------------------------|
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| NULL |
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|---------------------------------|
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| Environment pointers |
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|---------------------------------|
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| NULL |
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|---------------------------------|
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| Argument pointers |
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|---------------------------------| <- argv
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| argc (1 word) |
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|---------------------------------| <- bprm->exec (HACK!)
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| N bytes of slack |
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|---------------------------------|
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| filename passed to execve |
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|---------------------------------| (mm->env_end)
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| env strings |
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|---------------------------------| (mm->env_start, mm->arg_end)
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| arg strings |
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|---------------------------------|
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| additional faked arg strings if |
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| we're invoked via binfmt_script |
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|---------------------------------| (mm->arg_start)
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stack base is at TASK_SIZE - rlim_max.
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on downward growing arches, it looks like this:
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stack base at TASK_SIZE
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| filename passed to execve
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| env strings
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| arg strings
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| faked arg strings
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| slack
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| ELF
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| envps
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| argvs
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| argc
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* The pleasant part of this is that if we need to skip arguments we
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* can just decrement argc and move argv, because the stack pointer
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* is utterly unrelated to the location of the environment and
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* argument vectors.
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*
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* Note that the S/390 people took the easy way out and hacked their
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* GCC to make the stack grow downwards.
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*
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* Final Note: For entry from syscall, the W (wide) bit of the PSW
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* is stuffed into the lowest bit of the user sp (%r30), so we fill
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* it in here from the current->personality
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*/
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#ifdef CONFIG_64BIT
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#define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
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#else
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#define USER_WIDE_MODE 0
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#endif
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#define start_thread(regs, new_pc, new_sp) do { \
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elf_addr_t *sp = (elf_addr_t *)new_sp; \
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__u32 spaceid = (__u32)current->mm->context; \
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elf_addr_t pc = (elf_addr_t)new_pc | 3; \
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elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \
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\
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regs->iasq[0] = spaceid; \
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regs->iasq[1] = spaceid; \
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regs->iaoq[0] = pc; \
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regs->iaoq[1] = pc + 4; \
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regs->sr[2] = LINUX_GATEWAY_SPACE; \
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regs->sr[3] = 0xffff; \
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regs->sr[4] = spaceid; \
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regs->sr[5] = spaceid; \
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regs->sr[6] = spaceid; \
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regs->sr[7] = spaceid; \
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regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
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regs->fr[ 0] = 0LL; \
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regs->fr[ 1] = 0LL; \
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regs->fr[ 2] = 0LL; \
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regs->fr[ 3] = 0LL; \
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regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
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regs->gr[31] = pc; \
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\
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get_user(regs->gr[25], (argv - 1)); \
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regs->gr[24] = (long) argv; \
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regs->gr[23] = 0; \
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} while(0)
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struct task_struct;
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struct mm_struct;
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/* Free all resources held by a thread. */
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extern void release_thread(struct task_struct *);
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extern unsigned long get_wchan(struct task_struct *p);
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#define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
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#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
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#define cpu_relax() barrier()
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#define cpu_relax_lowlatency() cpu_relax()
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/*
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* parisc_requires_coherency() is used to identify the combined VIPT/PIPT
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* cached CPUs which require a guarantee of coherency (no inequivalent aliases
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* with different data, whether clean or not) to operate
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*/
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#ifdef CONFIG_PA8X00
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extern int _parisc_requires_coherency;
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#define parisc_requires_coherency() _parisc_requires_coherency
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#else
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#define parisc_requires_coherency() (0)
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#endif
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extern int running_on_qemu;
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_PARISC_PROCESSOR_H */
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