1 files changed, 144 insertions, 30 deletions

diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c
index 30d0843ed701..9da36bab7ccb 100644
--- a/arch/blackfin/kernel/process.c
+++ b/arch/blackfin/kernel/process.c
@@ -160,6 +160,29 @@ pid_t kernel_thread(int (*fn) (void *), void *arg, unsigned long flags)
 }
 EXPORT_SYMBOL(kernel_thread);
 
+/*
+ * Do necessary setup to start up a newly executed thread.
+ *
+ * pass the data segment into user programs if it exists,
+ * it can't hurt anything as far as I can tell
+ */
+void start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
+{
+        set_fs(USER_DS);
+        regs->pc = new_ip;
+        if (current->mm)
+                regs->p5 = current->mm->start_data;
+#ifdef CONFIG_SMP
+        task_thread_info(current)->l1_task_info.stack_start =
+                (void *)current->mm->context.stack_start;
+        task_thread_info(current)->l1_task_info.lowest_sp = (void *)new_sp;
+        memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info,
+               sizeof(*L1_SCRATCH_TASK_INFO));
+#endif
+        wrusp(new_sp);
+}
+EXPORT_SYMBOL_GPL(start_thread);
+
 void flush_thread(void)
 {
 }
@@ -321,6 +344,87 @@ void finish_atomic_sections (struct pt_regs *regs)
         }
 }
 
+static inline
+int in_mem(unsigned long addr, unsigned long size,
+           unsigned long start, unsigned long end)
+{
+        return addr >= start && addr + size <= end;
+}
+static inline
+int in_mem_const_off(unsigned long addr, unsigned long size, unsigned long off,
+                     unsigned long const_addr, unsigned long const_size)
+{
+        return const_size &&
+               in_mem(addr, size, const_addr + off, const_addr + const_size);
+}
+static inline
+int in_mem_const(unsigned long addr, unsigned long size,
+                 unsigned long const_addr, unsigned long const_size)
+{
+        return in_mem_const_off(addr, size, 0, const_addr, const_size);
+}
+#define IN_ASYNC(bnum, bctlnum) \
+({ \
+        (bfin_read_EBIU_AMGCTL() & 0xe) < ((bnum + 1) << 1) ? -EFAULT : \
+        bfin_read_EBIU_AMBCTL##bctlnum() & B##bnum##RDYEN ? -EFAULT : \
+        BFIN_MEM_ACCESS_CORE; \
+})
+
+int bfin_mem_access_type(unsigned long addr, unsigned long size)
+{
+        int cpu = raw_smp_processor_id();
+
+        /* Check that things do not wrap around */
+        if (addr > ULONG_MAX - size)
+                return -EFAULT;
+
+        if (in_mem(addr, size, FIXED_CODE_START, physical_mem_end))
+                return BFIN_MEM_ACCESS_CORE;
+
+        if (in_mem_const(addr, size, L1_CODE_START, L1_CODE_LENGTH))
+                return cpu == 0 ? BFIN_MEM_ACCESS_ITEST : BFIN_MEM_ACCESS_IDMA;
+        if (in_mem_const(addr, size, L1_SCRATCH_START, L1_SCRATCH_LENGTH))
+                return cpu == 0 ? BFIN_MEM_ACCESS_CORE_ONLY : -EFAULT;
+        if (in_mem_const(addr, size, L1_DATA_A_START, L1_DATA_A_LENGTH))
+                return cpu == 0 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
+        if (in_mem_const(addr, size, L1_DATA_B_START, L1_DATA_B_LENGTH))
+                return cpu == 0 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
+#ifdef COREB_L1_CODE_START
+        if (in_mem_const(addr, size, COREB_L1_CODE_START, COREB_L1_CODE_LENGTH))
+                return cpu == 1 ? BFIN_MEM_ACCESS_ITEST : BFIN_MEM_ACCESS_IDMA;
+        if (in_mem_const(addr, size, COREB_L1_SCRATCH_START, L1_SCRATCH_LENGTH))
+                return cpu == 1 ? BFIN_MEM_ACCESS_CORE_ONLY : -EFAULT;
+        if (in_mem_const(addr, size, COREB_L1_DATA_A_START, COREB_L1_DATA_A_LENGTH))
+                return cpu == 1 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
+        if (in_mem_const(addr, size, COREB_L1_DATA_B_START, COREB_L1_DATA_B_LENGTH))
+                return cpu == 1 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
+#endif
+        if (in_mem_const(addr, size, L2_START, L2_LENGTH))
+                return BFIN_MEM_ACCESS_CORE;
+
+        if (addr >= SYSMMR_BASE)
+                return BFIN_MEM_ACCESS_CORE_ONLY;
+
+        /* We can't read EBIU banks that aren't enabled or we end up hanging
+         * on the access to the async space.
+         */
+        if (in_mem_const(addr, size, ASYNC_BANK0_BASE, ASYNC_BANK0_SIZE))
+                return IN_ASYNC(0, 0);
+        if (in_mem_const(addr, size, ASYNC_BANK1_BASE, ASYNC_BANK1_SIZE))
+                return IN_ASYNC(1, 0);
+        if (in_mem_const(addr, size, ASYNC_BANK2_BASE, ASYNC_BANK2_SIZE))
+                return IN_ASYNC(2, 1);
+        if (in_mem_const(addr, size, ASYNC_BANK3_BASE, ASYNC_BANK3_SIZE))
+                return IN_ASYNC(3, 1);
+
+        if (in_mem_const(addr, size, BOOT_ROM_START, BOOT_ROM_LENGTH))
+                return BFIN_MEM_ACCESS_CORE;
+        if (in_mem_const(addr, size, L1_ROM_START, L1_ROM_LENGTH))
+                return BFIN_MEM_ACCESS_DMA;
+
+        return -EFAULT;
+}
+
 #if defined(CONFIG_ACCESS_CHECK)
 #ifdef CONFIG_ACCESS_OK_L1
 __attribute__((l1_text))
@@ -330,51 +434,61 @@ int _access_ok(unsigned long addr, unsigned long size)
 {
         if (size == 0)
                 return 1;
-        if (addr > (addr + size))
+        /* Check that things do not wrap around */
+        if (addr > ULONG_MAX - size)
                 return 0;
         if (segment_eq(get_fs(), KERNEL_DS))
                 return 1;
 #ifdef CONFIG_MTD_UCLINUX
-        if (addr >= memory_start && (addr + size) <= memory_end)
-                return 1;
-        if (addr >= memory_mtd_end && (addr + size) <= physical_mem_end)
+        if (1)
+#else
+        if (0)
+#endif
+        {
+                if (in_mem(addr, size, memory_start, memory_end))
+                        return 1;
+                if (in_mem(addr, size, memory_mtd_end, physical_mem_end))
+                        return 1;
+# ifndef CONFIG_ROMFS_ON_MTD
+                if (0)
+# endif
+                        /* For XIP, allow user space to use pointers within the ROMFS.  */
+                        if (in_mem(addr, size, memory_mtd_start, memory_mtd_end))
+                                return 1;
+        } else {
+                if (in_mem(addr, size, memory_start, physical_mem_end))
+                        return 1;
+        }
+
+        if (in_mem(addr, size, (unsigned long)__init_begin, (unsigned long)__init_end))
                 return 1;
 
-#ifdef CONFIG_ROMFS_ON_MTD
-        /* For XIP, allow user space to use pointers within the ROMFS.  */
-        if (addr >= memory_mtd_start && (addr + size) <= memory_mtd_end)
+        if (in_mem_const(addr, size, L1_CODE_START, L1_CODE_LENGTH))
                 return 1;
-#endif
-#else
-        if (addr >= memory_start && (addr + size) <= physical_mem_end)
+        if (in_mem_const_off(addr, size, _etext_l1 - _stext_l1, L1_CODE_START, L1_CODE_LENGTH))
                 return 1;
-#endif
-        if (addr >= (unsigned long)__init_begin &&
-            addr + size <= (unsigned long)__init_end)
+        if (in_mem_const_off(addr, size, _ebss_l1 - _sdata_l1, L1_DATA_A_START, L1_DATA_A_LENGTH))
                 return 1;
-        if (addr >= get_l1_scratch_start()
-            && addr + size <= get_l1_scratch_start() + L1_SCRATCH_LENGTH)
+        if (in_mem_const_off(addr, size, _ebss_b_l1 - _sdata_b_l1, L1_DATA_B_START, L1_DATA_B_LENGTH))
                 return 1;
-#if L1_CODE_LENGTH != 0
-        if (addr >= get_l1_code_start() + (_etext_l1 - _stext_l1)
-            && addr + size <= get_l1_code_start() + L1_CODE_LENGTH)
+#ifdef COREB_L1_CODE_START
+        if (in_mem_const(addr, size, COREB_L1_CODE_START, COREB_L1_CODE_LENGTH))
                 return 1;
-#endif
-#if L1_DATA_A_LENGTH != 0
-        if (addr >= get_l1_data_a_start() + (_ebss_l1 - _sdata_l1)
-            && addr + size <= get_l1_data_a_start() + L1_DATA_A_LENGTH)
+        if (in_mem_const(addr, size, COREB_L1_SCRATCH_START, L1_SCRATCH_LENGTH))
                 return 1;
-#endif
-#if L1_DATA_B_LENGTH != 0
-        if (addr >= get_l1_data_b_start() + (_ebss_b_l1 - _sdata_b_l1)
-            && addr + size <= get_l1_data_b_start() + L1_DATA_B_LENGTH)
+        if (in_mem_const(addr, size, COREB_L1_DATA_A_START, COREB_L1_DATA_A_LENGTH))
                 return 1;
-#endif
-#if L2_LENGTH != 0
-        if (addr >= L2_START + (_ebss_l2 - _stext_l2)
-            && addr + size <= L2_START + L2_LENGTH)
+        if (in_mem_const(addr, size, COREB_L1_DATA_B_START, COREB_L1_DATA_B_LENGTH))
                 return 1;
 #endif
+        if (in_mem_const_off(addr, size, _ebss_l2 - _stext_l2, L2_START, L2_LENGTH))
+                return 1;
+
+        if (in_mem_const(addr, size, BOOT_ROM_START, BOOT_ROM_LENGTH))
+                return 1;
+        if (in_mem_const(addr, size, L1_ROM_START, L1_ROM_LENGTH))
+                return 1;
+
         return 0;
 }
 EXPORT_SYMBOL(_access_ok);