| /* |
| * 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 |
| #if !CHIP_HAS_FIXED_INTVEC_BASE() |
| /* Interrupt base for PL0 interrupts */ |
| unsigned long interrupt_vector_base; |
| #endif |
| #if CHIP_HAS_TILE_RTF_HWM() |
| /* Tile cache retry fifo high-water mark */ |
| unsigned long tile_rtf_hwm; |
| #endif |
| #if CHIP_HAS_DSTREAM_PF() |
| /* Data stream prefetch control */ |
| unsigned long dstream_pf; |
| #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 */ |
| } |
| |
| extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
| |
| extern int do_work_pending(struct pt_regs *regs, u32 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(); |
| } |
| |
| /* 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[]; |
| |
| #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; |
| |
| /* Support standard Linux prefetching. */ |
| #define ARCH_HAS_PREFETCH |
| #define prefetch(x) __builtin_prefetch(x) |
| #define PREFETCH_STRIDE CHIP_L2_LINE_SIZE() |
| |
| /* Bring a value into the L1D, faulting the TLB if necessary. */ |
| #ifdef __tilegx__ |
| #define prefetch_L1(x) __insn_prefetch_l1_fault((void *)(x)) |
| #else |
| #define prefetch_L1(x) __insn_prefetch_L1((void *)(x)) |
| #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 |
| #if CONFIG_KERNEL_PL == 2 |
| #define GUEST_PL 1 |
| #endif |
| #define KERNEL_PL CONFIG_KERNEL_PL |
| |
| /* SYSTEM_SAVE_K_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_K_0) & CPU_MASK_VALUE) |
| #define get_current_ksp0() \ |
| (__insn_mfspr(SPR_SYSTEM_SAVE_K_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 */ |