diff options
Diffstat (limited to 'arch/tile/include/asm/processor.h')
| -rw-r--r-- | arch/tile/include/asm/processor.h | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/arch/tile/include/asm/processor.h b/arch/tile/include/asm/processor.h new file mode 100644 index 0000000..96c50d2 --- /dev/null +++ b/arch/tile/include/asm/processor.h @@ -0,0 +1,339 @@ +/* + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#ifndef _ASM_TILE_PROCESSOR_H +#define _ASM_TILE_PROCESSOR_H + +#ifndef __ASSEMBLY__ + +/* + * NOTE: we don't include <linux/ptrace.h> or <linux/percpu.h> as one + * normally would, due to #include dependencies. + */ +#include <asm/ptrace.h> +#include <asm/percpu.h> + +#include <arch/chip.h> +#include <arch/spr_def.h> + +struct task_struct; +struct thread_struct; +struct list_head; + +typedef struct { + unsigned long seg; +} mm_segment_t; + +/* + * Default implementation of macro that returns current + * instruction pointer ("program counter"). + */ +void *current_text_addr(void); + +#if CHIP_HAS_TILE_DMA() +/* Capture the state of a suspended DMA. */ +struct tile_dma_state { + int enabled; + unsigned long src; + unsigned long dest; + unsigned long strides; + unsigned long chunk_size; + unsigned long src_chunk; + unsigned long dest_chunk; + unsigned long byte; + unsigned long status; +}; + +/* + * A mask of the DMA status register for selecting only the 'running' + * and 'done' bits. + */ +#define DMA_STATUS_MASK \ + (SPR_DMA_STATUS__RUNNING_MASK | SPR_DMA_STATUS__DONE_MASK) +#endif + +/* + * Track asynchronous TLB events (faults and access violations) + * that occur while we are in kernel mode from DMA or the SN processor. + */ +struct async_tlb { + short fault_num; /* original fault number; 0 if none */ + char is_fault; /* was it a fault (vs an access violation) */ + char is_write; /* for fault: was it caused by a write? */ + unsigned long address; /* what address faulted? */ +}; + + +struct thread_struct { + /* kernel stack pointer */ + unsigned long ksp; + /* kernel PC */ + unsigned long pc; + /* starting user stack pointer (for page migration) */ + unsigned long usp0; + /* pid of process that created this one */ + pid_t creator_pid; +#if CHIP_HAS_TILE_DMA() + /* DMA info for suspended threads (byte == 0 means no DMA state) */ + struct tile_dma_state tile_dma_state; +#endif + /* User EX_CONTEXT registers */ + unsigned long ex_context[2]; + /* User SYSTEM_SAVE registers */ + unsigned long system_save[4]; + /* User interrupt mask */ + unsigned long long interrupt_mask; + /* User interrupt-control 0 state */ + unsigned long intctrl_0; +#if CHIP_HAS_PROC_STATUS_SPR() + /* Any other miscellaneous processor state bits */ + unsigned long proc_status; +#endif +#if CHIP_HAS_TILE_DMA() + /* Async DMA TLB fault information */ + struct async_tlb dma_async_tlb; +#endif +#if CHIP_HAS_SN_PROC() + /* Was static network processor when we were switched out? */ + int sn_proc_running; + /* Async SNI TLB fault information */ + struct async_tlb sn_async_tlb; +#endif +}; + +#endif /* !__ASSEMBLY__ */ + +/* + * Start with "sp" this many bytes below the top of the kernel stack. + * This preserves the invariant that a called function may write to *sp. + */ +#define STACK_TOP_DELTA 8 + +/* + * When entering the kernel via a fault, start with the top of the + * pt_regs structure this many bytes below the top of the page. + * This aligns the pt_regs structure optimally for cache-line access. + */ +#ifdef __tilegx__ +#define KSTK_PTREGS_GAP 48 +#else +#define KSTK_PTREGS_GAP 56 +#endif + +#ifndef __ASSEMBLY__ + +#ifdef __tilegx__ +#define TASK_SIZE_MAX (MEM_LOW_END + 1) +#else +#define TASK_SIZE_MAX PAGE_OFFSET +#endif + +/* TASK_SIZE and related variables are always checked in "current" context. */ +#ifdef CONFIG_COMPAT +#define COMPAT_TASK_SIZE (1UL << 31) +#define TASK_SIZE ((current_thread_info()->status & TS_COMPAT) ?\ + COMPAT_TASK_SIZE : TASK_SIZE_MAX) +#else +#define TASK_SIZE TASK_SIZE_MAX +#endif + +/* We provide a minimal "vdso" a la x86; just the sigreturn code for now. */ +#define VDSO_BASE (TASK_SIZE - PAGE_SIZE) + +#define STACK_TOP VDSO_BASE + +/* STACK_TOP_MAX is used temporarily in execve and should not check COMPAT. */ +#define STACK_TOP_MAX TASK_SIZE_MAX + +/* + * This decides where the kernel will search for a free chunk of vm + * space during mmap's, if it is using bottom-up mapping. + */ +#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) + +#define HAVE_ARCH_PICK_MMAP_LAYOUT + +#define INIT_THREAD { \ + .ksp = (unsigned long)init_stack + THREAD_SIZE - STACK_TOP_DELTA, \ + .interrupt_mask = -1ULL \ +} + +/* Kernel stack top for the task that first boots on this cpu. */ +DECLARE_PER_CPU(unsigned long, boot_sp); + +/* PC to boot from on this cpu. */ +DECLARE_PER_CPU(unsigned long, boot_pc); + +/* Do necessary setup to start up a newly executed thread. */ +static inline void start_thread(struct pt_regs *regs, + unsigned long pc, unsigned long usp) +{ + regs->pc = pc; + regs->sp = usp; +} + +/* Free all resources held by a thread. */ +static inline void release_thread(struct task_struct *dead_task) +{ + /* Nothing for now */ +} + +/* Prepare to copy thread state - unlazy all lazy status. */ +#define prepare_to_copy(tsk) do { } while (0) + +extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); + +/* Helper routines for setting home cache modes at exec() time. */ + + +/* + * Return saved (kernel) PC of a blocked thread. + * Only used in a printk() in kernel/sched.c, so don't work too hard. + */ +#define thread_saved_pc(t) ((t)->thread.pc) + +unsigned long get_wchan(struct task_struct *p); + +/* Return initial ksp value for given task. */ +#define task_ksp0(task) ((unsigned long)(task)->stack + THREAD_SIZE) + +/* Return some info about the user process TASK. */ +#define KSTK_TOP(task) (task_ksp0(task) - STACK_TOP_DELTA) +#define task_pt_regs(task) \ + ((struct pt_regs *)(task_ksp0(task) - KSTK_PTREGS_GAP) - 1) +#define task_sp(task) (task_pt_regs(task)->sp) +#define task_pc(task) (task_pt_regs(task)->pc) +/* Aliases for pc and sp (used in fs/proc/array.c) */ +#define KSTK_EIP(task) task_pc(task) +#define KSTK_ESP(task) task_sp(task) + +/* Standard format for printing registers and other word-size data. */ +#ifdef __tilegx__ +# define REGFMT "0x%016lx" +#else +# define REGFMT "0x%08lx" +#endif + +/* + * Do some slow action (e.g. read a slow SPR). + * Note that this must also have compiler-barrier semantics since + * it may be used in a busy loop reading memory. + */ +static inline void cpu_relax(void) +{ + __insn_mfspr(SPR_PASS); + barrier(); +} + +struct siginfo; +extern void arch_coredump_signal(struct siginfo *, struct pt_regs *); +#define arch_coredump_signal arch_coredump_signal + +/* Provide information about the chip model. */ +extern char chip_model[64]; + +/* Data on which physical memory controller corresponds to which NUMA node. */ +extern int node_controller[]; + + +/* Do we dump information to the console when a user application crashes? */ +extern int show_crashinfo; + +#if CHIP_HAS_CBOX_HOME_MAP() +/* Does the heap allocator return hash-for-home pages by default? */ +extern int hash_default; + +/* Should kernel stack pages be hash-for-home? */ +extern int kstack_hash; +#else +#define hash_default 0 +#define kstack_hash 0 +#endif + +/* Are we using huge pages in the TLB for kernel data? */ +extern int kdata_huge; + +/* + * Note that with OLOC the prefetch will return an unused read word to + * the issuing tile, which will cause some MDN traffic. Benchmarking + * should be done to see whether this outweighs prefetching. + */ +#define ARCH_HAS_PREFETCH +#define ARCH_HAS_PREFETCHW +#define ARCH_HAS_SPINLOCK_PREFETCH + +#define prefetch(ptr) __builtin_prefetch((ptr), 0, 3) +#define prefetchw(ptr) __builtin_prefetch((ptr), 1, 3) + +#ifdef CONFIG_SMP +#define spin_lock_prefetch(ptr) prefetchw(ptr) +#else +/* Nothing to prefetch. */ +#define spin_lock_prefetch(lock) do { } while (0) +#endif + +#else /* __ASSEMBLY__ */ + +/* Do some slow action (e.g. read a slow SPR). */ +#define CPU_RELAX mfspr zero, SPR_PASS + +#endif /* !__ASSEMBLY__ */ + +/* Assembly code assumes that the PL is in the low bits. */ +#if SPR_EX_CONTEXT_1_1__PL_SHIFT != 0 +# error Fix assembly assumptions about PL +#endif + +/* We sometimes use these macros for EX_CONTEXT_0_1 as well. */ +#if SPR_EX_CONTEXT_1_1__PL_SHIFT != SPR_EX_CONTEXT_0_1__PL_SHIFT || \ + SPR_EX_CONTEXT_1_1__PL_RMASK != SPR_EX_CONTEXT_0_1__PL_RMASK || \ + SPR_EX_CONTEXT_1_1__ICS_SHIFT != SPR_EX_CONTEXT_0_1__ICS_SHIFT || \ + SPR_EX_CONTEXT_1_1__ICS_RMASK != SPR_EX_CONTEXT_0_1__ICS_RMASK +# error Fix assumptions that EX1 macros work for both PL0 and PL1 +#endif + +/* Allow pulling apart and recombining the PL and ICS bits in EX_CONTEXT. */ +#define EX1_PL(ex1) \ + (((ex1) >> SPR_EX_CONTEXT_1_1__PL_SHIFT) & SPR_EX_CONTEXT_1_1__PL_RMASK) +#define EX1_ICS(ex1) \ + (((ex1) >> SPR_EX_CONTEXT_1_1__ICS_SHIFT) & SPR_EX_CONTEXT_1_1__ICS_RMASK) +#define PL_ICS_EX1(pl, ics) \ + (((pl) << SPR_EX_CONTEXT_1_1__PL_SHIFT) | \ + ((ics) << SPR_EX_CONTEXT_1_1__ICS_SHIFT)) + +/* + * Provide symbolic constants for PLs. + * Note that assembly code assumes that USER_PL is zero. + */ +#define USER_PL 0 +#define KERNEL_PL 1 + +/* SYSTEM_SAVE_1_0 holds the current cpu number ORed with ksp0. */ +#define CPU_LOG_MASK_VALUE 12 +#define CPU_MASK_VALUE ((1 << CPU_LOG_MASK_VALUE) - 1) +#if CONFIG_NR_CPUS > CPU_MASK_VALUE +# error Too many cpus! +#endif +#define raw_smp_processor_id() \ + ((int)__insn_mfspr(SPR_SYSTEM_SAVE_1_0) & CPU_MASK_VALUE) +#define get_current_ksp0() \ + (__insn_mfspr(SPR_SYSTEM_SAVE_1_0) & ~CPU_MASK_VALUE) +#define next_current_ksp0(task) ({ \ + unsigned long __ksp0 = task_ksp0(task); \ + int __cpu = raw_smp_processor_id(); \ + BUG_ON(__ksp0 & CPU_MASK_VALUE); \ + __ksp0 | __cpu; \ +}) + +#endif /* _ASM_TILE_PROCESSOR_H */ |