/*
- * File: arch/blackfin/kernel/process.c
- * Based on:
- * Author:
+ * Blackfin architecture-dependent process handling
*
- * Created:
- * Description: Blackfin architecture-dependent process handling.
+ * Copyright 2004-2009 Analog Devices Inc.
*
- * Modified:
- * Copyright 2004-2006 Analog Devices Inc.
- *
- * Bugs: Enter bugs at http://blackfin.uclinux.org/
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see the file COPYING, or write
- * to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * Licensed under the GPL-2 or later
*/
#include <linux/module.h>
#include <linux/unistd.h>
#include <linux/user.h>
#include <linux/uaccess.h>
+#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/tick.h>
#include <linux/fs.h>
#include <asm/blackfin.h>
#include <asm/fixed_code.h>
+#include <asm/mem_map.h>
asmlinkage void ret_from_fork(void);
*/
static void default_idle(void)
{
- local_irq_disable();
+#ifdef CONFIG_IPIPE
+ ipipe_suspend_domain();
+#endif
+ local_irq_disable_hw();
if (!need_resched())
idle_with_irq_disabled();
- local_irq_enable();
+ local_irq_enable_hw();
}
/*
#endif
if (!idle)
idle = default_idle;
- tick_nohz_stop_sched_tick();
+ tick_nohz_stop_sched_tick(1);
while (!need_resched())
idle();
tick_nohz_restart_sched_tick();
}
}
-/* Fill in the fpu structure for a core dump. */
-
-int dump_fpu(struct pt_regs *regs, elf_fpregset_t * fpregs)
-{
- return 1;
-}
-
/*
* This gets run with P1 containing the
* function to call, and R1 containing
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL,
NULL);
}
+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;
+#ifndef 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)
{
unsigned long clone_flags;
unsigned long newsp;
+#ifdef __ARCH_SYNC_CORE_DCACHE
+ if (current->rt.nr_cpus_allowed == num_possible_cpus()) {
+ current->cpus_allowed = cpumask_of_cpu(smp_processor_id());
+ current->rt.nr_cpus_allowed = 1;
+ }
+#endif
+
/* syscall2 puts clone_flags in r0 and usp in r1 */
clone_flags = regs->r0;
newsp = regs->r1;
}
int
-copy_thread(int nr, unsigned long clone_flags,
+copy_thread(unsigned long clone_flags,
unsigned long usp, unsigned long topstk,
struct task_struct *p, struct pt_regs *regs)
{
/*
* sys_execve() executes a new program.
*/
-
asmlinkage int sys_execve(char __user *name, char __user * __user *argv, char __user * __user *envp)
{
int error;
char *filename;
struct pt_regs *regs = (struct pt_regs *)((&name) + 6);
- lock_kernel();
filename = getname(name);
error = PTR_ERR(filename);
if (IS_ERR(filename))
- goto out;
+ return error;
error = do_execve(filename, argv, envp, regs);
putname(filename);
- out:
- unlock_kernel();
return error;
}
void finish_atomic_sections (struct pt_regs *regs)
{
- int __user *up0 = (int __user *)®s->p0;
+ int __user *up0 = (int __user *)regs->p0;
- if (regs->pc < ATOMIC_SEQS_START || regs->pc >= ATOMIC_SEQS_END)
+ switch (regs->pc) {
+ default:
+ /* not in middle of an atomic step, so resume like normal */
return;
- switch (regs->pc) {
case ATOMIC_XCHG32 + 2:
put_user(regs->r1, up0);
- regs->pc += 2;
break;
case ATOMIC_CAS32 + 2:
case ATOMIC_CAS32 + 4:
if (regs->r0 == regs->r1)
- put_user(regs->r2, up0);
- regs->pc = ATOMIC_CAS32 + 8;
- break;
case ATOMIC_CAS32 + 6:
- put_user(regs->r2, up0);
- regs->pc += 2;
+ put_user(regs->r2, up0);
break;
case ATOMIC_ADD32 + 2:
/* fall through */
case ATOMIC_ADD32 + 4:
put_user(regs->r0, up0);
- regs->pc = ATOMIC_ADD32 + 6;
break;
case ATOMIC_SUB32 + 2:
/* fall through */
case ATOMIC_SUB32 + 4:
put_user(regs->r0, up0);
- regs->pc = ATOMIC_SUB32 + 6;
break;
case ATOMIC_IOR32 + 2:
/* fall through */
case ATOMIC_IOR32 + 4:
put_user(regs->r0, up0);
- regs->pc = ATOMIC_IOR32 + 6;
break;
case ATOMIC_AND32 + 2:
/* fall through */
case ATOMIC_AND32 + 4:
put_user(regs->r0, up0);
- regs->pc = ATOMIC_AND32 + 6;
break;
case ATOMIC_XOR32 + 2:
/* fall through */
case ATOMIC_XOR32 + 4:
put_user(regs->r0, up0);
- regs->pc = ATOMIC_XOR32 + 6;
break;
}
+
+ /*
+ * We've finished the atomic section, and the only thing left for
+ * userspace is to do a RTS, so we might as well handle that too
+ * since we need to update the PC anyways.
+ */
+ regs->pc = regs->rets;
+}
+
+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 ASYNC_ENABLED(bnum, bctlnum) \
+({ \
+ (bfin_read_EBIU_AMGCTL() & 0xe) < ((bnum + 1) << 1) ? 0 : \
+ bfin_read_EBIU_AMBCTL##bctlnum() & B##bnum##RDYEN ? 0 : \
+ 1; \
+})
+/*
+ * We can't read EBIU banks that aren't enabled or we end up hanging
+ * on the access to the async space. Make sure we validate accesses
+ * that cross async banks too.
+ * 0 - found, but unusable
+ * 1 - found & usable
+ * 2 - not found
+ */
+static
+int in_async(unsigned long addr, unsigned long size)
+{
+ if (addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE) {
+ if (!ASYNC_ENABLED(0, 0))
+ return 0;
+ if (addr + size <= ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)
+ return 1;
+ size -= ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE - addr;
+ addr = ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE;
+ }
+ if (addr >= ASYNC_BANK1_BASE && addr < ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE) {
+ if (!ASYNC_ENABLED(1, 0))
+ return 0;
+ if (addr + size <= ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)
+ return 1;
+ size -= ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE - addr;
+ addr = ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE;
+ }
+ if (addr >= ASYNC_BANK2_BASE && addr < ASYNC_BANK2_BASE + ASYNC_BANK2_SIZE) {
+ if (!ASYNC_ENABLED(2, 1))
+ return 0;
+ if (addr + size <= ASYNC_BANK2_BASE + ASYNC_BANK2_SIZE)
+ return 1;
+ size -= ASYNC_BANK2_BASE + ASYNC_BANK2_SIZE - addr;
+ addr = ASYNC_BANK2_BASE + ASYNC_BANK2_SIZE;
+ }
+ if (addr >= ASYNC_BANK3_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE) {
+ if (ASYNC_ENABLED(3, 1))
+ return 0;
+ if (addr + size <= ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE)
+ return 1;
+ return 0;
+ }
+
+ /* not within async bounds */
+ return 2;
+}
+
+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;
+
+ switch (in_async(addr, size)) {
+ case 0: return -EFAULT;
+ case 1: return BFIN_MEM_ACCESS_CORE;
+ case 2: /* fall through */;
+ }
+
+ 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))
+#endif
/* Return 1 if access to memory range is OK, 0 otherwise */
int _access_ok(unsigned long addr, unsigned long size)
{
+ int aret;
+
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_MTD_FS
- /* 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 >= L1_SCRATCH_START
- && addr + size <= 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 >= L1_CODE_START + (_etext_l1 - _stext_l1)
- && addr + size <= 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 >= L1_DATA_A_START + (_ebss_l1 - _sdata_l1)
- && addr + size <= 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 >= L1_DATA_B_START
- && addr + size <= 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;
+ if (in_mem_const(addr, size, COREB_L1_DATA_B_START, COREB_L1_DATA_B_LENGTH))
return 1;
#endif
+
+ aret = in_async(addr, size);
+ if (aret < 2)
+ return aret;
+
+ 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);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff