forked from Minki/linux
microblaze_mmu_v2: Update process creation for MMU
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek
parent
1f84e1ea0e
commit
5233806dfe
@ -1,6 +1,6 @@
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/*
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* Copyright (C) 2008 Michal Simek
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* Copyright (C) 2008 PetaLogix
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 PetaLogix
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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@ -26,14 +26,15 @@ extern const struct seq_operations cpuinfo_op;
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# define cpu_sleep() do {} while (0)
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# define prepare_to_copy(tsk) do {} while (0)
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# endif /* __ASSEMBLY__ */
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#define task_pt_regs(tsk) \
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(((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
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/* Do necessary setup to start up a newly executed thread. */
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void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
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# endif /* __ASSEMBLY__ */
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# ifndef CONFIG_MMU
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/*
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* User space process size: memory size
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*
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@ -85,4 +86,90 @@ extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
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# define KSTK_EIP(tsk) (0)
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# define KSTK_ESP(tsk) (0)
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# else /* CONFIG_MMU */
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/*
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* This is used to define STACK_TOP, and with MMU it must be below
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* kernel base to select the correct PGD when handling MMU exceptions.
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*/
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# define TASK_SIZE (CONFIG_KERNEL_START)
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/*
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* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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# define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
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# define THREAD_KSP 0
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# ifndef __ASSEMBLY__
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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# define current_text_addr() ({ __label__ _l; _l: &&_l; })
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/* If you change this, you must change the associated assembly-languages
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* constants defined below, THREAD_*.
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*/
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struct thread_struct {
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/* kernel stack pointer (must be first field in structure) */
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unsigned long ksp;
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unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
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void *pgdir; /* root of page-table tree */
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struct pt_regs *regs; /* Pointer to saved register state */
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};
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# define INIT_THREAD { \
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.ksp = sizeof init_stack + (unsigned long)init_stack, \
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.pgdir = swapper_pg_dir, \
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}
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/* Do necessary setup to start up a newly executed thread. */
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void start_thread(struct pt_regs *regs,
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unsigned long pc, unsigned long usp);
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/* Free all resources held by a thread. */
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extern inline void release_thread(struct task_struct *dead_task)
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{
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}
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extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
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/* Free current thread data structures etc. */
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static inline void exit_thread(void)
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{
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}
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/* Return saved (kernel) PC of a blocked thread. */
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# define thread_saved_pc(tsk) \
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((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0)
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unsigned long get_wchan(struct task_struct *p);
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/* The size allocated for kernel stacks. This _must_ be a power of two! */
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# define KERNEL_STACK_SIZE 0x2000
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/* Return some info about the user process TASK. */
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# define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE)
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# define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
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# define task_pt_regs_plus_args(tsk) \
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(((void *)task_pt_regs(tsk)) - STATE_SAVE_ARG_SPACE)
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# define task_sp(task) (task_regs(task)->r1)
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# define task_pc(task) (task_regs(task)->pc)
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/* Grotty old names for some. */
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# define KSTK_EIP(task) (task_pc(task))
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# define KSTK_ESP(task) (task_sp(task))
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/* FIXME */
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# define deactivate_mm(tsk, mm) do { } while (0)
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# define STACK_TOP TASK_SIZE
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# define STACK_TOP_MAX STACK_TOP
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# endif /* __ASSEMBLY__ */
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# endif /* CONFIG_MMU */
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#endif /* _ASM_MICROBLAZE_PROCESSOR_H */
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@ -1,6 +1,6 @@
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/*
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* Copyright (C) 2008 Michal Simek
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* Copyright (C) 2008 PetaLogix
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 PetaLogix
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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@ -30,4 +30,21 @@
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#define FSR_UF (1<<1) /* Underflow */
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#define FSR_DO (1<<0) /* Denormalized operand error */
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# ifdef CONFIG_MMU
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/* Machine State Register (MSR) Fields */
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# define MSR_UM (1<<11) /* User Mode */
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# define MSR_UMS (1<<12) /* User Mode Save */
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# define MSR_VM (1<<13) /* Virtual Mode */
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# define MSR_VMS (1<<14) /* Virtual Mode Save */
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# define MSR_KERNEL (MSR_EE | MSR_VM)
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/* # define MSR_USER (MSR_KERNEL | MSR_UM | MSR_IE) */
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# define MSR_KERNEL_VMS (MSR_EE | MSR_VMS)
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/* # define MSR_USER_VMS (MSR_KERNEL_VMS | MSR_UMS | MSR_IE) */
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/* Exception State Register (ESR) Fields */
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# define ESR_DIZ (1<<11) /* Zone Protection */
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# define ESR_S (1<<10) /* Store instruction */
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# endif /* CONFIG_MMU */
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#endif /* _ASM_MICROBLAZE_REGISTERS_H */
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@ -1,6 +1,6 @@
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/*
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* Copyright (C) 2008 Michal Simek
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* Copyright (C) 2008 PetaLogix
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 PetaLogix
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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@ -11,7 +11,7 @@
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#ifndef _ASM_MICROBLAZE_SEGMENT_H
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#define _ASM_MICROBLAZE_SEGMENT_H
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#ifndef __ASSEMBLY__
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# ifndef __ASSEMBLY__
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typedef struct {
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unsigned long seg;
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@ -29,15 +29,21 @@ typedef struct {
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*
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* For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
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*/
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# define KERNEL_DS ((mm_segment_t){0})
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# define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
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# ifndef CONFIG_MMU
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# define KERNEL_DS MAKE_MM_SEG(0)
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# define USER_DS KERNEL_DS
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# else
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# define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
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# define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
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# endif
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# define get_ds() (KERNEL_DS)
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# define get_fs() (current_thread_info()->addr_limit)
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# define set_fs(x) \
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do { current_thread_info()->addr_limit = (x); } while (0)
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# define set_fs(val) (current_thread_info()->addr_limit = (val))
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# define segment_eq(a, b) ((a).seg == (b).seg)
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# define segment_eq(a, b) ((a).seg == (b).seg)
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# endif /* __ASSEMBLY__ */
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#endif /* _ASM_MICROBLAZE_SEGMENT_H */
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@ -126,9 +126,54 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
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else
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childregs->r1 = ((unsigned long) ti) + THREAD_SIZE;
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#ifndef CONFIG_MMU
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memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
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ti->cpu_context.r1 = (unsigned long)childregs;
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ti->cpu_context.msr = (unsigned long)childregs->msr;
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#else
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/* if creating a kernel thread then update the current reg (we don't
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* want to use the parent's value when restoring by POP_STATE) */
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if (kernel_mode(regs))
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/* save new current on stack to use POP_STATE */
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childregs->CURRENT_TASK = (unsigned long)p;
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/* if returning to user then use the parent's value of this register */
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/* if we're creating a new kernel thread then just zeroing all
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* the registers. That's OK for a brand new thread.*/
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/* Pls. note that some of them will be restored in POP_STATE */
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if (kernel_mode(regs))
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memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
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/* if this thread is created for fork/vfork/clone, then we want to
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* restore all the parent's context */
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/* in addition to the registers which will be restored by POP_STATE */
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else {
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ti->cpu_context = *(struct cpu_context *)regs;
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childregs->msr |= MSR_UMS;
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}
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/* FIXME STATE_SAVE_PT_OFFSET; */
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ti->cpu_context.r1 = (unsigned long)childregs - STATE_SAVE_ARG_SPACE;
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/* we should consider the fact that childregs is a copy of the parent
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* regs which were saved immediately after entering the kernel state
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* before enabling VM. This MSR will be restored in switch_to and
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* RETURN() and we want to have the right machine state there
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* specifically this state must have INTs disabled before and enabled
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* after performing rtbd
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* compose the right MSR for RETURN(). It will work for switch_to also
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* excepting for VM and UMS
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* don't touch UMS , CARRY and cache bits
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* right now MSR is a copy of parent one */
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childregs->msr |= MSR_BIP;
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childregs->msr &= ~MSR_EIP;
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childregs->msr |= MSR_IE;
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childregs->msr &= ~MSR_VM;
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childregs->msr |= MSR_VMS;
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childregs->msr |= MSR_EE; /* exceptions will be enabled*/
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ti->cpu_context.msr = (childregs->msr|MSR_VM);
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ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */
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#endif
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ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8;
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if (clone_flags & CLONE_SETTLS)
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@ -137,6 +182,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
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return 0;
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}
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#ifndef CONFIG_MMU
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/*
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* Return saved PC of a blocked thread.
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*/
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@ -151,6 +197,7 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
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else
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return ctx->r14;
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}
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#endif
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static void kernel_thread_helper(int (*fn)(void *), void *arg)
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{
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@ -189,3 +236,14 @@ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp)
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regs->r1 = usp;
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regs->pt_mode = 0;
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}
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#ifdef CONFIG_MMU
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#include <linux/elfcore.h>
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/*
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* Set up a thread for executing a new program
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*/
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int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
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{
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return 0; /* MicroBlaze has no separate FPU registers */
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}
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#endif /* CONFIG_MMU */
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