diff options
Diffstat (limited to 'arch/arc/include/asm/processor.h')
| -rw-r--r-- | arch/arc/include/asm/processor.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/arch/arc/include/asm/processor.h b/arch/arc/include/asm/processor.h new file mode 100644 index 000000000..8ee41e988 --- /dev/null +++ b/arch/arc/include/asm/processor.h @@ -0,0 +1,162 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * vineetg: March 2009 + * -Implemented task_pt_regs( ) + * + * Amit Bhor, Sameer Dhavale, Ashwin Chaugule: Codito Technologies 2004 + */ + +#ifndef __ASM_ARC_PROCESSOR_H +#define __ASM_ARC_PROCESSOR_H + +#ifndef __ASSEMBLY__ + +#include <asm/ptrace.h> + +#ifdef CONFIG_ARC_FPU_SAVE_RESTORE +/* These DPFP regs need to be saved/restored across ctx-sw */ +struct arc_fpu { + struct { + unsigned int l, h; + } aux_dpfp[2]; +}; +#endif + +#ifdef CONFIG_ARC_PLAT_EZNPS +struct eznps_dp { + unsigned int eflags; + unsigned int gpa1; +}; +#endif + +/* Arch specific stuff which needs to be saved per task. + * However these items are not so important so as to earn a place in + * struct thread_info + */ +struct thread_struct { + unsigned long ksp; /* kernel mode stack pointer */ + unsigned long callee_reg; /* pointer to callee regs */ + unsigned long fault_address; /* dbls as brkpt holder as well */ +#ifdef CONFIG_ARC_FPU_SAVE_RESTORE + struct arc_fpu fpu; +#endif +#ifdef CONFIG_ARC_PLAT_EZNPS + struct eznps_dp dp; +#endif +}; + +#define INIT_THREAD { \ + .ksp = sizeof(init_stack) + (unsigned long) init_stack, \ +} + +/* Forward declaration, a strange C thing */ +struct task_struct; + +#define task_pt_regs(p) \ + ((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1) + +/* Free all resources held by a thread */ +#define release_thread(thread) do { } while (0) + +/* + * A lot of busy-wait loops in SMP are based off of non-volatile data otherwise + * get optimised away by gcc + */ +#ifndef CONFIG_EZNPS_MTM_EXT + +#define cpu_relax() barrier() + +#else + +#define cpu_relax() \ + __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory") + +#endif + +#define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret) +#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) + +/* + * Where about of Task's sp, fp, blink when it was last seen in kernel mode. + * Look in process.c for details of kernel stack layout + */ +#define TSK_K_ESP(tsk) (tsk->thread.ksp) + +#define TSK_K_REG(tsk, off) (*((unsigned long *)(TSK_K_ESP(tsk) + \ + sizeof(struct callee_regs) + off))) + +#define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4) +#define TSK_K_FP(tsk) TSK_K_REG(tsk, 0) + +extern void start_thread(struct pt_regs * regs, unsigned long pc, + unsigned long usp); + +extern unsigned int get_wchan(struct task_struct *p); + +/* + * Default implementation of macro that returns current + * instruction pointer ("program counter"). + * Should the PC register be read instead ? This macro does not seem to + * be used in many places so this wont be all that bad. + */ +#define current_text_addr() ({ __label__ _l; _l: &&_l; }) + +#endif /* !__ASSEMBLY__ */ + +/* + * Default System Memory Map on ARC + * + * ---------------------------- (lower 2G, Translated) ------------------------- + * 0x0000_0000 0x5FFF_FFFF (user vaddr: TASK_SIZE) + * 0x6000_0000 0x6FFF_FFFF (reserved gutter between U/K) + * 0x7000_0000 0x7FFF_FFFF (kvaddr: vmalloc/modules/pkmap..) + * + * PAGE_OFFSET ---------------- (Upper 2G, Untranslated) ----------------------- + * 0x8000_0000 0xBFFF_FFFF (kernel direct mapped) + * 0xC000_0000 0xFFFF_FFFF (peripheral uncached space) + * ----------------------------------------------------------------------------- + */ + +#define TASK_SIZE 0x60000000 + +#define VMALLOC_START (PAGE_OFFSET - (CONFIG_ARC_KVADDR_SIZE << 20)) + +/* 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter (see asm/highmem.h) */ +#define VMALLOC_SIZE ((CONFIG_ARC_KVADDR_SIZE << 20) - PGDIR_SIZE * 4) + +#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) + +#define USER_KERNEL_GUTTER (VMALLOC_START - TASK_SIZE) + +#ifdef CONFIG_ARC_PLAT_EZNPS +/* NPS architecture defines special window of 129M in user address space for + * special memory areas, when accessing this window the MMU do not use TLB. + * Instead MMU direct the access to: + * 0x57f00000:0x57ffffff -- 1M of closely coupled memory (aka CMEM) + * 0x58000000:0x5fffffff -- 16 huge pages, 8M each, with fixed map (aka FMTs) + * + * CMEM - is the fastest memory we got and its size is 16K. + * FMT - is used to map either to internal/external memory. + * Internal memory is the second fast memory and its size is 16M + * External memory is the biggest memory (16G) and also the slowest. + * + * STACK_TOP need to be PMD align (21bit) that is why we supply 0x57e00000. + */ +#define STACK_TOP 0x57e00000 +#else +#define STACK_TOP TASK_SIZE +#endif + +#define STACK_TOP_MAX STACK_TOP + +/* This decides where the kernel will search for a free chunk of vm + * space during mmap's. + */ +#define TASK_UNMAPPED_BASE (TASK_SIZE / 3) + +#endif /* __ASM_ARC_PROCESSOR_H */ |