microblaze_mmu_v2: Update process creation for MMU
Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/include/asm/processor.h b/arch/microblaze/include/asm/processor.h
index 9329029..563c6b9 100644
--- a/arch/microblaze/include/asm/processor.h
+++ b/arch/microblaze/include/asm/processor.h
@@ -1,6 +1,6 @@
/*
- * Copyright (C) 2008 Michal Simek
- * Copyright (C) 2008 PetaLogix
+ * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2008-2009 PetaLogix
* Copyright (C) 2006 Atmark Techno, Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
@@ -26,14 +26,15 @@
# define cpu_sleep() do {} while (0)
# define prepare_to_copy(tsk) do {} while (0)
-# endif /* __ASSEMBLY__ */
-
#define task_pt_regs(tsk) \
(((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
/* Do necessary setup to start up a newly executed thread. */
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
+# endif /* __ASSEMBLY__ */
+
+# ifndef CONFIG_MMU
/*
* User space process size: memory size
*
@@ -85,4 +86,90 @@
# define KSTK_EIP(tsk) (0)
# define KSTK_ESP(tsk) (0)
+# else /* CONFIG_MMU */
+
+/*
+ * This is used to define STACK_TOP, and with MMU it must be below
+ * kernel base to select the correct PGD when handling MMU exceptions.
+ */
+# define TASK_SIZE (CONFIG_KERNEL_START)
+
+/*
+ * This decides where the kernel will search for a free chunk of vm
+ * space during mmap's.
+ */
+# define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
+
+# define THREAD_KSP 0
+
+# ifndef __ASSEMBLY__
+
+/*
+ * Default implementation of macro that returns current
+ * instruction pointer ("program counter").
+ */
+# define current_text_addr() ({ __label__ _l; _l: &&_l; })
+
+/* If you change this, you must change the associated assembly-languages
+ * constants defined below, THREAD_*.
+ */
+struct thread_struct {
+ /* kernel stack pointer (must be first field in structure) */
+ unsigned long ksp;
+ unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
+ void *pgdir; /* root of page-table tree */
+ struct pt_regs *regs; /* Pointer to saved register state */
+};
+
+# define INIT_THREAD { \
+ .ksp = sizeof init_stack + (unsigned long)init_stack, \
+ .pgdir = swapper_pg_dir, \
+}
+
+/* Do necessary setup to start up a newly executed thread. */
+void start_thread(struct pt_regs *regs,
+ unsigned long pc, unsigned long usp);
+
+/* Free all resources held by a thread. */
+extern inline void release_thread(struct task_struct *dead_task)
+{
+}
+
+extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
+
+/* Free current thread data structures etc. */
+static inline void exit_thread(void)
+{
+}
+
+/* Return saved (kernel) PC of a blocked thread. */
+# define thread_saved_pc(tsk) \
+ ((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0)
+
+unsigned long get_wchan(struct task_struct *p);
+
+/* The size allocated for kernel stacks. This _must_ be a power of two! */
+# define KERNEL_STACK_SIZE 0x2000
+
+/* Return some info about the user process TASK. */
+# define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE)
+# define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
+
+# define task_pt_regs_plus_args(tsk) \
+ (((void *)task_pt_regs(tsk)) - STATE_SAVE_ARG_SPACE)
+
+# define task_sp(task) (task_regs(task)->r1)
+# define task_pc(task) (task_regs(task)->pc)
+/* Grotty old names for some. */
+# define KSTK_EIP(task) (task_pc(task))
+# define KSTK_ESP(task) (task_sp(task))
+
+/* FIXME */
+# define deactivate_mm(tsk, mm) do { } while (0)
+
+# define STACK_TOP TASK_SIZE
+# define STACK_TOP_MAX STACK_TOP
+
+# endif /* __ASSEMBLY__ */
+# endif /* CONFIG_MMU */
#endif /* _ASM_MICROBLAZE_PROCESSOR_H */