system.h
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上传日期:2013-04-10
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- #ifndef _ASM_IA64_SYSTEM_H
- #define _ASM_IA64_SYSTEM_H
- /*
- * System defines. Note that this is included both from .c and .S
- * files, so it does only defines, not any C code. This is based
- * on information published in the Processor Abstraction Layer
- * and the System Abstraction Layer manual.
- *
- * Copyright (C) 1998-2002 Hewlett-Packard Co
- * David Mosberger-Tang <davidm@hpl.hp.com>
- * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
- * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
- */
- #include <linux/config.h>
- #include <asm/kregs.h>
- #include <asm/page.h>
- #include <asm/pal.h>
- #define KERNEL_START (PAGE_OFFSET + 68*1024*1024)
- #define GATE_ADDR (0xa000000000000000 + PAGE_SIZE)
- #define PERCPU_ADDR (0xa000000000000000 + 2*PAGE_SIZE)
- #ifndef __ASSEMBLY__
- #include <linux/kernel.h>
- #include <linux/types.h>
- struct pci_vector_struct {
- __u16 segment; /* PCI Segment number */
- __u16 bus; /* PCI Bus number */
- __u32 pci_id; /* ACPI split 16 bits device, 16 bits function (see section 6.1.1) */
- __u8 pin; /* PCI PIN (0 = A, 1 = B, 2 = C, 3 = D) */
- __u32 irq; /* IRQ assigned */
- };
- extern struct ia64_boot_param {
- __u64 command_line; /* physical address of command line arguments */
- __u64 efi_systab; /* physical address of EFI system table */
- __u64 efi_memmap; /* physical address of EFI memory map */
- __u64 efi_memmap_size; /* size of EFI memory map */
- __u64 efi_memdesc_size; /* size of an EFI memory map descriptor */
- __u32 efi_memdesc_version; /* memory descriptor version */
- struct {
- __u16 num_cols; /* number of columns on console output device */
- __u16 num_rows; /* number of rows on console output device */
- __u16 orig_x; /* cursor's x position */
- __u16 orig_y; /* cursor's y position */
- } console_info;
- __u64 fpswa; /* physical address of the fpswa interface */
- __u64 initrd_start;
- __u64 initrd_size;
- } *ia64_boot_param;
- static inline void
- ia64_insn_group_barrier (void)
- {
- __asm__ __volatile__ (";;" ::: "memory");
- }
- /*
- * Macros to force memory ordering. In these descriptions, "previous"
- * and "subsequent" refer to program order; "visible" means that all
- * architecturally visible effects of a memory access have occurred
- * (at a minimum, this means the memory has been read or written).
- *
- * wmb(): Guarantees that all preceding stores to memory-
- * like regions are visible before any subsequent
- * stores and that all following stores will be
- * visible only after all previous stores.
- * rmb(): Like wmb(), but for reads.
- * mb(): wmb()/rmb() combo, i.e., all previous memory
- * accesses are visible before all subsequent
- * accesses and vice versa. This is also known as
- * a "fence."
- *
- * Note: "mb()" and its variants cannot be used as a fence to order
- * accesses to memory mapped I/O registers. For that, mf.a needs to
- * be used. However, we don't want to always use mf.a because (a)
- * it's (presumably) much slower than mf and (b) mf.a is supported for
- * sequential memory pages only.
- */
- #define mb() __asm__ __volatile__ ("mf" ::: "memory")
- #define rmb() mb()
- #define wmb() mb()
- #ifdef CONFIG_SMP
- # define smp_mb() mb()
- # define smp_rmb() rmb()
- # define smp_wmb() wmb()
- #else
- # define smp_mb() barrier()
- # define smp_rmb() barrier()
- # define smp_wmb() barrier()
- #endif
- /*
- * XXX check on these---I suspect what Linus really wants here is
- * acquire vs release semantics but we can't discuss this stuff with
- * Linus just yet. Grrr...
- */
- #define set_mb(var, value) do { (var) = (value); mb(); } while (0)
- #define set_wmb(var, value) do { (var) = (value); mb(); } while (0)
- #define safe_halt() ia64_pal_halt(1) /* PAL_HALT */
- /*
- * The group barrier in front of the rsm & ssm are necessary to ensure
- * that none of the previous instructions in the same group are
- * affected by the rsm/ssm.
- */
- /* For spinlocks etc */
- #ifdef CONFIG_IA64_DEBUG_IRQ
- extern unsigned long last_cli_ip;
- # define local_irq_save(x)
- do {
- unsigned long ip, psr;
-
- __asm__ __volatile__ ("mov %0=psr;; rsm psr.i;;" : "=r" (psr) :: "memory");
- if (psr & (1UL << 14)) {
- __asm__ ("mov %0=ip" : "=r"(ip));
- last_cli_ip = ip;
- }
- (x) = psr;
- } while (0)
- # define local_irq_disable()
- do {
- unsigned long ip, psr;
-
- __asm__ __volatile__ ("mov %0=psr;; rsm psr.i;;" : "=r" (psr) :: "memory");
- if (psr & (1UL << 14)) {
- __asm__ ("mov %0=ip" : "=r"(ip));
- last_cli_ip = ip;
- }
- } while (0)
- # define local_irq_restore(x)
- do {
- unsigned long ip, old_psr, psr = (x);
-
- __asm__ __volatile__ ("mov %0=psr;"
- "cmp.ne p6,p7=%1,r0;;"
- "(p6) ssm psr.i;"
- "(p7) rsm psr.i;;"
- "srlz.d"
- : "=&r" (old_psr) : "r"((psr) & IA64_PSR_I)
- : "p6", "p7", "memory");
- if ((old_psr & IA64_PSR_I) && !(psr & IA64_PSR_I)) {
- __asm__ ("mov %0=ip" : "=r"(ip));
- last_cli_ip = ip;
- }
- } while (0)
- #else /* !CONFIG_IA64_DEBUG_IRQ */
- /* clearing of psr.i is implicitly serialized (visible by next insn) */
- # define local_irq_save(x) __asm__ __volatile__ ("mov %0=psr;; rsm psr.i;;"
- : "=r" (x) :: "memory")
- # define local_irq_disable() __asm__ __volatile__ (";; rsm psr.i;;" ::: "memory")
- /* (potentially) setting psr.i requires data serialization: */
- # define local_irq_restore(x) __asm__ __volatile__ ("cmp.ne p6,p7=%0,r0;;"
- "(p6) ssm psr.i;"
- "(p7) rsm psr.i;;"
- "srlz.d"
- :: "r"((x) & IA64_PSR_I)
- : "p6", "p7", "memory")
- #endif /* !CONFIG_IA64_DEBUG_IRQ */
- #define local_irq_enable() __asm__ __volatile__ (";; ssm psr.i;; srlz.d" ::: "memory")
- #define __cli() local_irq_disable ()
- #define __save_flags(flags) __asm__ __volatile__ ("mov %0=psr" : "=r" (flags) :: "memory")
- #define __save_and_cli(flags) local_irq_save(flags)
- #define save_and_cli(flags) __save_and_cli(flags)
- #define __sti() local_irq_enable ()
- #define __restore_flags(flags) local_irq_restore(flags)
- #ifdef CONFIG_SMP
- extern void __global_cli (void);
- extern void __global_sti (void);
- extern unsigned long __global_save_flags (void);
- extern void __global_restore_flags (unsigned long);
- # define cli() __global_cli()
- # define sti() __global_sti()
- # define save_flags(flags) ((flags) = __global_save_flags())
- # define restore_flags(flags) __global_restore_flags(flags)
- #else /* !CONFIG_SMP */
- # define cli() __cli()
- # define sti() __sti()
- # define save_flags(flags) __save_flags(flags)
- # define restore_flags(flags) __restore_flags(flags)
- #endif /* !CONFIG_SMP */
- /*
- * Force an unresolved reference if someone tries to use
- * ia64_fetch_and_add() with a bad value.
- */
- extern unsigned long __bad_size_for_ia64_fetch_and_add (void);
- extern unsigned long __bad_increment_for_ia64_fetch_and_add (void);
- #define IA64_FETCHADD(tmp,v,n,sz)
- ({
- switch (sz) {
- case 4:
- __asm__ __volatile__ ("fetchadd4.rel %0=[%1],%2"
- : "=r"(tmp) : "r"(v), "i"(n) : "memory");
- break;
-
- case 8:
- __asm__ __volatile__ ("fetchadd8.rel %0=[%1],%2"
- : "=r"(tmp) : "r"(v), "i"(n) : "memory");
- break;
-
- default:
- __bad_size_for_ia64_fetch_and_add();
- }
- })
- #define ia64_fetch_and_add(i,v)
- ({
- __u64 _tmp;
- volatile __typeof__(*(v)) *_v = (v);
- switch (i) {
- case -16: IA64_FETCHADD(_tmp, _v, -16, sizeof(*(v))); break;
- case -8: IA64_FETCHADD(_tmp, _v, -8, sizeof(*(v))); break;
- case -4: IA64_FETCHADD(_tmp, _v, -4, sizeof(*(v))); break;
- case -1: IA64_FETCHADD(_tmp, _v, -1, sizeof(*(v))); break;
- case 1: IA64_FETCHADD(_tmp, _v, 1, sizeof(*(v))); break;
- case 4: IA64_FETCHADD(_tmp, _v, 4, sizeof(*(v))); break;
- case 8: IA64_FETCHADD(_tmp, _v, 8, sizeof(*(v))); break;
- case 16: IA64_FETCHADD(_tmp, _v, 16, sizeof(*(v))); break;
- default:
- _tmp = __bad_increment_for_ia64_fetch_and_add();
- break;
- }
- (__typeof__(*(v))) (_tmp + (i)); /* return new value */
- })
- /*
- * This function doesn't exist, so you'll get a linker error if
- * something tries to do an invalid xchg().
- */
- extern void __xchg_called_with_bad_pointer (void);
- static __inline__ unsigned long
- __xchg (unsigned long x, volatile void *ptr, int size)
- {
- unsigned long result;
- switch (size) {
- case 1:
- __asm__ __volatile ("xchg1 %0=[%1],%2" : "=r" (result)
- : "r" (ptr), "r" (x) : "memory");
- return result;
- case 2:
- __asm__ __volatile ("xchg2 %0=[%1],%2" : "=r" (result)
- : "r" (ptr), "r" (x) : "memory");
- return result;
- case 4:
- __asm__ __volatile ("xchg4 %0=[%1],%2" : "=r" (result)
- : "r" (ptr), "r" (x) : "memory");
- return result;
- case 8:
- __asm__ __volatile ("xchg8 %0=[%1],%2" : "=r" (result)
- : "r" (ptr), "r" (x) : "memory");
- return result;
- }
- __xchg_called_with_bad_pointer();
- return x;
- }
- #define xchg(ptr,x)
- ((__typeof__(*(ptr))) __xchg ((unsigned long) (x), (ptr), sizeof(*(ptr))))
- /*
- * Atomic compare and exchange. Compare OLD with MEM, if identical,
- * store NEW in MEM. Return the initial value in MEM. Success is
- * indicated by comparing RETURN with OLD.
- */
- #define __HAVE_ARCH_CMPXCHG 1
- /*
- * This function doesn't exist, so you'll get a linker error
- * if something tries to do an invalid cmpxchg().
- */
- extern long __cmpxchg_called_with_bad_pointer(void);
- #define ia64_cmpxchg(sem,ptr,old,new,size)
- ({
- __typeof__(ptr) _p_ = (ptr);
- __typeof__(new) _n_ = (new);
- __u64 _o_, _r_;
-
- switch (size) {
- case 1: _o_ = (__u8 ) (long) (old); break;
- case 2: _o_ = (__u16) (long) (old); break;
- case 4: _o_ = (__u32) (long) (old); break;
- case 8: _o_ = (__u64) (long) (old); break;
- default: break;
- }
- __asm__ __volatile__ ("mov ar.ccv=%0;;" :: "rO"(_o_));
- switch (size) {
- case 1:
- __asm__ __volatile__ ("cmpxchg1."sem" %0=[%1],%2,ar.ccv"
- : "=r"(_r_) : "r"(_p_), "r"(_n_) : "memory");
- break;
-
- case 2:
- __asm__ __volatile__ ("cmpxchg2."sem" %0=[%1],%2,ar.ccv"
- : "=r"(_r_) : "r"(_p_), "r"(_n_) : "memory");
- break;
-
- case 4:
- __asm__ __volatile__ ("cmpxchg4."sem" %0=[%1],%2,ar.ccv"
- : "=r"(_r_) : "r"(_p_), "r"(_n_) : "memory");
- break;
-
- case 8:
- __asm__ __volatile__ ("cmpxchg8."sem" %0=[%1],%2,ar.ccv"
- : "=r"(_r_) : "r"(_p_), "r"(_n_) : "memory");
- break;
-
- default:
- _r_ = __cmpxchg_called_with_bad_pointer();
- break;
- }
- (__typeof__(old)) _r_;
- })
- #define cmpxchg_acq(ptr,o,n) ia64_cmpxchg("acq", (ptr), (o), (n), sizeof(*(ptr)))
- #define cmpxchg_rel(ptr,o,n) ia64_cmpxchg("rel", (ptr), (o), (n), sizeof(*(ptr)))
- /* for compatibility with other platforms: */
- #define cmpxchg(ptr,o,n) cmpxchg_acq(ptr,o,n)
- #ifdef CONFIG_IA64_DEBUG_CMPXCHG
- # define CMPXCHG_BUGCHECK_DECL int _cmpxchg_bugcheck_count = 128;
- # define CMPXCHG_BUGCHECK(v)
- do {
- if (_cmpxchg_bugcheck_count-- <= 0) {
- void *ip;
- extern int printk(const char *fmt, ...);
- asm ("mov %0=ip" : "=r"(ip));
- printk("CMPXCHG_BUGCHECK: stuck at %p on word %pn", ip, (v));
- break;
- }
- } while (0)
- #else /* !CONFIG_IA64_DEBUG_CMPXCHG */
- # define CMPXCHG_BUGCHECK_DECL
- # define CMPXCHG_BUGCHECK(v)
- #endif /* !CONFIG_IA64_DEBUG_CMPXCHG */
- #ifdef __KERNEL__
- #define prepare_to_switch() do { } while(0)
- #ifdef CONFIG_IA32_SUPPORT
- # define IS_IA32_PROCESS(regs) (ia64_psr(regs)->is != 0)
- #else
- # define IS_IA32_PROCESS(regs) 0
- #endif
- /*
- * Context switch from one thread to another. If the two threads have
- * different address spaces, schedule() has already taken care of
- * switching to the new address space by calling switch_mm().
- *
- * Disabling access to the fph partition and the debug-register
- * context switch MUST be done before calling ia64_switch_to() since a
- * newly created thread returns directly to
- * ia64_ret_from_syscall_clear_r8.
- */
- extern struct task_struct *ia64_switch_to (void *next_task);
- extern void ia64_save_extra (struct task_struct *task);
- extern void ia64_load_extra (struct task_struct *task);
- #if defined(CONFIG_SMP) && defined(CONFIG_PERFMON)
- # define PERFMON_IS_SYSWIDE() (local_cpu_data->pfm_syst_wide != 0)
- #else
- # define PERFMON_IS_SYSWIDE() (0)
- #endif
- #define __switch_to(prev,next,last) do {
- if (((prev)->thread.flags & (IA64_THREAD_DBG_VALID|IA64_THREAD_PM_VALID))
- || IS_IA32_PROCESS(ia64_task_regs(prev)) || PERFMON_IS_SYSWIDE())
- ia64_save_extra(prev);
- if (((next)->thread.flags & (IA64_THREAD_DBG_VALID|IA64_THREAD_PM_VALID))
- || IS_IA32_PROCESS(ia64_task_regs(next)) || PERFMON_IS_SYSWIDE())
- ia64_load_extra(next);
- (last) = ia64_switch_to((next));
- } while (0)
- #ifdef CONFIG_SMP
- /* Return true if this CPU can call the console drivers in printk() */
- #define arch_consoles_callable() (cpu_online_map & (1UL << smp_processor_id()))
- /*
- * In the SMP case, we save the fph state when context-switching
- * away from a thread that modified fph. This way, when the thread
- * gets scheduled on another CPU, the CPU can pick up the state from
- * task->thread.fph, avoiding the complication of having to fetch
- * the latest fph state from another CPU.
- */
- # define switch_to(prev,next,last) do {
- if (ia64_psr(ia64_task_regs(prev))->mfh) {
- ia64_psr(ia64_task_regs(prev))->mfh = 0;
- (prev)->thread.flags |= IA64_THREAD_FPH_VALID;
- __ia64_save_fpu((prev)->thread.fph);
- (prev)->thread.last_fph_cpu = smp_processor_id();
- }
- if ((next)->thread.flags & IA64_THREAD_FPH_VALID) {
- if (((next)->thread.last_fph_cpu == smp_processor_id())
- && (ia64_get_fpu_owner() == next)) {
- ia64_psr(ia64_task_regs(next))->dfh = 0;
- ia64_psr(ia64_task_regs(next))->mfh = 0;
- } else {
- ia64_psr(ia64_task_regs(next))->dfh = 1;
- }
- }
- __switch_to(prev,next,last);
- } while (0)
- #else
- # define switch_to(prev,next,last) do {
- ia64_psr(ia64_task_regs(next))->dfh = (ia64_get_fpu_owner() != (next));
- __switch_to(prev,next,last);
- } while (0)
- #endif
- #endif /* __KERNEL__ */
- #endif /* __ASSEMBLY__ */
- #endif /* _ASM_IA64_SYSTEM_H */