/* * 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 <linux/types.h> #include <asm/ptrace.h> #include <asm/percpu.h> #include <arch/chip.h> #include <arch/spr_def.h> struct task_struct; struct thread_struct; 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? */ }; #ifdef CONFIG_HARDWALL struct hardwall_info; #endif 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 #ifdef CONFIG_HARDWALL /* Is this task tied to an activated hardwall? */ struct hardwall_info *hardwall; /* Chains this task into the list at hardwall->list. */ struct list_head hardwall_list; #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); /* * 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 /* Info on this processor (see fs/proc/cpuinfo.c) */ struct seq_operations; extern const struct seq_operations cpuinfo_op; /* 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; /* Does MAP_ANONYMOUS return hash-for-home pages by default? */ #define uheap_hash hash_default #else #define hash_default 0 #define kstack_hash 0 #define uheap_hash 0 #endif /* Are we using huge pages in the TLB for kernel data? */ extern int kdata_huge; #define PREFETCH_STRIDE CHIP_L2_LINE_SIZE() #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 */