microblaze_mmu_v2: Update process creation for MMU

Signed-off-by: Michal Simek <monstr@monstr.eu>

4 files changed, 181 insertions, 13 deletions

diff --git a/arch/microblaze/include/asm/processor.h b/arch/microblaze/include/asm/processor.h
index 9329029d2614..563c6b9453f0 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 @@ extern const struct seq_operations cpuinfo_op;
 # 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 @@ extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 # 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 */
diff --git a/arch/microblaze/include/asm/registers.h b/arch/microblaze/include/asm/registers.h
index 834142d9356f..68c3afb73877 100644
--- a/arch/microblaze/include/asm/registers.h
+++ b/arch/microblaze/include/asm/registers.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
@@ -30,4 +30,21 @@
 #define FSR_UF          (1<<1) /* Underflow */
 #define FSR_DO          (1<<0) /* Denormalized operand error */
 
+# ifdef CONFIG_MMU
+/* Machine State Register (MSR) Fields */
+# define MSR_UM         (1<<11) /* User Mode */
+# define MSR_UMS        (1<<12) /* User Mode Save */
+# define MSR_VM         (1<<13) /* Virtual Mode */
+# define MSR_VMS        (1<<14) /* Virtual Mode Save */
+
+# define MSR_KERNEL     (MSR_EE | MSR_VM)
+/* # define MSR_USER    (MSR_KERNEL | MSR_UM | MSR_IE) */
+# define MSR_KERNEL_VMS (MSR_EE | MSR_VMS)
+/* # define MSR_USER_VMS        (MSR_KERNEL_VMS | MSR_UMS | MSR_IE) */
+
+/* Exception State Register (ESR) Fields */
+# define          ESR_DIZ       (1<<11) /* Zone Protection */
+# define          ESR_S         (1<<10) /* Store instruction */
+
+# endif /* CONFIG_MMU */
 #endif /* _ASM_MICROBLAZE_REGISTERS_H */
diff --git a/arch/microblaze/include/asm/segment.h b/arch/microblaze/include/asm/segment.h
index 7f5dcc56eea1..0e7102c3fb11 100644
--- a/arch/microblaze/include/asm/segment.h
+++ b/arch/microblaze/include/asm/segment.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
@@ -11,7 +11,7 @@
 #ifndef _ASM_MICROBLAZE_SEGMENT_H
 #define _ASM_MICROBLAZE_SEGMENT_H
 
-#ifndef __ASSEMBLY__
+# ifndef __ASSEMBLY__
 
 typedef struct {
         unsigned long seg;
@@ -29,15 +29,21 @@ typedef struct {
  *
  * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
  */
-#  define KERNEL_DS     ((mm_segment_t){0})
+# define MAKE_MM_SEG(s)       ((mm_segment_t) { (s) })
+
+#  ifndef CONFIG_MMU
+#  define KERNEL_DS     MAKE_MM_SEG(0)
 #  define USER_DS       KERNEL_DS
+#  else
+#  define KERNEL_DS     MAKE_MM_SEG(0xFFFFFFFF)
+#  define USER_DS       MAKE_MM_SEG(TASK_SIZE - 1)
+#  endif
 
 # define get_ds()       (KERNEL_DS)
 # define get_fs()       (current_thread_info()->addr_limit)
-# define set_fs(x) \
-                do { current_thread_info()->addr_limit = (x); } while (0)
+# define set_fs(val)    (current_thread_info()->addr_limit = (val))
 
-# define segment_eq(a, b)               ((a).seg == (b).seg)
+# define segment_eq(a, b)       ((a).seg == (b).seg)
 
 # endif /* __ASSEMBLY__ */
 #endif /* _ASM_MICROBLAZE_SEGMENT_H */
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index 685ad71ced50..00b12c6d5326 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -126,9 +126,54 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
         else
                 childregs->r1 = ((unsigned long) ti) + THREAD_SIZE;
 
+#ifndef CONFIG_MMU
         memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
         ti->cpu_context.r1 = (unsigned long)childregs;
         ti->cpu_context.msr = (unsigned long)childregs->msr;
+#else
+
+        /* if creating a kernel thread then update the current reg (we don't
+         * want to use the parent's value when restoring by POP_STATE) */
+        if (kernel_mode(regs))
+                /* save new current on stack to use POP_STATE */
+                childregs->CURRENT_TASK = (unsigned long)p;
+        /* if returning to user then use the parent's value of this register */
+
+        /* if we're creating a new kernel thread then just zeroing all
+         * the registers. That's OK for a brand new thread.*/
+        /* Pls. note that some of them will be restored in POP_STATE */
+        if (kernel_mode(regs))
+                memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
+        /* if this thread is created for fork/vfork/clone, then we want to
+         * restore all the parent's context */
+        /* in addition to the registers which will be restored by POP_STATE */
+        else {
+                ti->cpu_context = *(struct cpu_context *)regs;
+                childregs->msr |= MSR_UMS;
+        }
+
+        /* FIXME STATE_SAVE_PT_OFFSET; */
+        ti->cpu_context.r1  = (unsigned long)childregs - STATE_SAVE_ARG_SPACE;
+        /* we should consider the fact that childregs is a copy of the parent
+         * regs which were saved immediately after entering the kernel state
+         * before enabling VM. This MSR will be restored in switch_to and
+         * RETURN() and we want to have the right machine state there
+         * specifically this state must have INTs disabled before and enabled
+         * after performing rtbd
+         * compose the right MSR for RETURN(). It will work for switch_to also
+         * excepting for VM and UMS
+         * don't touch UMS , CARRY and cache bits
+         * right now MSR is a copy of parent one */
+        childregs->msr |= MSR_BIP;
+        childregs->msr &= ~MSR_EIP;
+        childregs->msr |= MSR_IE;
+        childregs->msr &= ~MSR_VM;
+        childregs->msr |= MSR_VMS;
+        childregs->msr |= MSR_EE; /* exceptions will be enabled*/
+
+        ti->cpu_context.msr = (childregs->msr|MSR_VM);
+        ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */
+#endif
         ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8;
 
         if (clone_flags & CLONE_SETTLS)
@@ -137,6 +182,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
         return 0;
 }
 
+#ifndef CONFIG_MMU
 /*
  * Return saved PC of a blocked thread.
  */
@@ -151,6 +197,7 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
         else
                 return ctx->r14;
 }
+#endif
 
 static void kernel_thread_helper(int (*fn)(void *), void *arg)
 {
@@ -189,3 +236,14 @@ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp)
         regs->r1 = usp;
         regs->pt_mode = 0;
 }
+
+#ifdef CONFIG_MMU
+#include <linux/elfcore.h>
+/*
+ * Set up a thread for executing a new program
+ */
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
+{
+        return 0; /* MicroBlaze has no separate FPU registers */
+}
+#endif /* CONFIG_MMU */