+++ /dev/null
-/*
- * Blackfin architecture-dependent process handling
- *
- * Copyright 2004-2009 Analog Devices Inc.
- *
- * 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/sched/debug.h>
-#include <linux/sched/task.h>
-#include <linux/sched/task_stack.h>
-#include <linux/mm_types.h>
-#include <linux/tick.h>
-#include <linux/fs.h>
-#include <linux/err.h>
-
-#include <asm/blackfin.h>
-#include <asm/fixed_code.h>
-#include <asm/mem_map.h>
-#include <asm/irq.h>
-
-asmlinkage void ret_from_fork(void);
-
-/* Points to the SDRAM backup memory for the stack that is currently in
- * L1 scratchpad memory.
- */
-void *current_l1_stack_save;
-
-/* The number of tasks currently using a L1 stack area. The SRAM is
- * allocated/deallocated whenever this changes from/to zero.
- */
-int nr_l1stack_tasks;
-
-/* Start and length of the area in L1 scratchpad memory which we've allocated
- * for process stacks.
- */
-void *l1_stack_base;
-unsigned long l1_stack_len;
-
-void (*pm_power_off)(void) = NULL;
-EXPORT_SYMBOL(pm_power_off);
-
-/*
- * The idle loop on BFIN
- */
-#ifdef CONFIG_IDLE_L1
-void arch_cpu_idle(void)__attribute__((l1_text));
-#endif
-
-/*
- * This is our default idle handler. We need to disable
- * interrupts here to ensure we don't miss a wakeup call.
- */
-void arch_cpu_idle(void)
-{
-#ifdef CONFIG_IPIPE
- ipipe_suspend_domain();
-#endif
- hard_local_irq_disable();
- if (!need_resched())
- idle_with_irq_disabled();
-
- hard_local_irq_enable();
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-void arch_cpu_idle_dead(void)
-{
- cpu_die();
-}
-#endif
-
-/*
- * 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)
-{
- 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)
-{
-}
-
-asmlinkage int bfin_clone(unsigned long clone_flags, unsigned long newsp)
-{
-#ifdef __ARCH_SYNC_CORE_DCACHE
- if (current->nr_cpus_allowed == num_possible_cpus())
- set_cpus_allowed_ptr(current, cpumask_of(smp_processor_id()));
-#endif
- if (newsp)
- newsp -= 12;
- return do_fork(clone_flags, newsp, 0, NULL, NULL);
-}
-
-int
-copy_thread(unsigned long clone_flags,
- unsigned long usp, unsigned long topstk,
- struct task_struct *p)
-{
- struct pt_regs *childregs;
- unsigned long *v;
-
- childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
- v = ((unsigned long *)childregs) - 2;
- if (unlikely(p->flags & PF_KTHREAD)) {
- memset(childregs, 0, sizeof(struct pt_regs));
- v[0] = usp;
- v[1] = topstk;
- childregs->orig_p0 = -1;
- childregs->ipend = 0x8000;
- __asm__ __volatile__("%0 = syscfg;":"=da"(childregs->syscfg):);
- p->thread.usp = 0;
- } else {
- *childregs = *current_pt_regs();
- childregs->r0 = 0;
- p->thread.usp = usp ? : rdusp();
- v[0] = v[1] = 0;
- }
-
- p->thread.ksp = (unsigned long)v;
- p->thread.pc = (unsigned long)ret_from_fork;
-
- return 0;
-}
-
-unsigned long get_wchan(struct task_struct *p)
-{
- unsigned long fp, pc;
- unsigned long stack_page;
- int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
- return 0;
-
- stack_page = (unsigned long)p;
- fp = p->thread.usp;
- do {
- if (fp < stack_page + sizeof(struct thread_info) ||
- fp >= 8184 + stack_page)
- return 0;
- pc = ((unsigned long *)fp)[1];
- if (!in_sched_functions(pc))
- return pc;
- fp = *(unsigned long *)fp;
- }
- while (count++ < 16);
- return 0;
-}
-
-void finish_atomic_sections (struct pt_regs *regs)
-{
- int __user *up0 = (int __user *)regs->p0;
-
- switch (regs->pc) {
- default:
- /* not in middle of an atomic step, so resume like normal */
- return;
-
- case ATOMIC_XCHG32 + 2:
- put_user(regs->r1, up0);
- break;
-
- case ATOMIC_CAS32 + 2:
- case ATOMIC_CAS32 + 4:
- if (regs->r0 == regs->r1)
- case ATOMIC_CAS32 + 6:
- put_user(regs->r2, up0);
- break;
-
- case ATOMIC_ADD32 + 2:
- regs->r0 = regs->r1 + regs->r0;
- /* fall through */
- case ATOMIC_ADD32 + 4:
- put_user(regs->r0, up0);
- break;
-
- case ATOMIC_SUB32 + 2:
- regs->r0 = regs->r1 - regs->r0;
- /* fall through */
- case ATOMIC_SUB32 + 4:
- put_user(regs->r0, up0);
- break;
-
- case ATOMIC_IOR32 + 2:
- regs->r0 = regs->r1 | regs->r0;
- /* fall through */
- case ATOMIC_IOR32 + 4:
- put_user(regs->r0, up0);
- break;
-
- case ATOMIC_AND32 + 2:
- regs->r0 = regs->r1 & regs->r0;
- /* fall through */
- case ATOMIC_AND32 + 4:
- put_user(regs->r0, up0);
- break;
-
- case ATOMIC_XOR32 + 2:
- regs->r0 = regs->r1 ^ regs->r0;
- /* fall through */
- case ATOMIC_XOR32 + 4:
- put_user(regs->r0, up0);
- 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);
-}
-#ifdef CONFIG_BF60x
-#define ASYNC_ENABLED(bnum, bctlnum) 1
-#else
-#define ASYNC_ENABLED(bnum, bctlnum) \
-({ \
- (bfin_read_EBIU_AMGCTL() & 0xe) < ((bnum + 1) << 1) ? 0 : \
- bfin_read_EBIU_AMBCTL##bctlnum() & B##bnum##RDYEN ? 0 : \
- 1; \
-})
-#endif
-/*
- * 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;
- /* Check that things do not wrap around */
- if (addr > ULONG_MAX - size)
- return 0;
- if (uaccess_kernel())
- return 1;
-#ifdef CONFIG_MTD_UCLINUX
- 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;
-
- if (in_mem_const(addr, size, L1_CODE_START, L1_CODE_LENGTH))
- return 1;
- if (in_mem_const_off(addr, size, _etext_l1 - _stext_l1, L1_CODE_START, L1_CODE_LENGTH))
- return 1;
- if (in_mem_const_off(addr, size, _ebss_l1 - _sdata_l1, L1_DATA_A_START, L1_DATA_A_LENGTH))
- return 1;
- if (in_mem_const_off(addr, size, _ebss_b_l1 - _sdata_b_l1, L1_DATA_B_START, L1_DATA_B_LENGTH))
- return 1;
-#ifdef COREB_L1_CODE_START
- if (in_mem_const(addr, size, COREB_L1_CODE_START, COREB_L1_CODE_LENGTH))
- return 1;
- if (in_mem_const(addr, size, COREB_L1_SCRATCH_START, L1_SCRATCH_LENGTH))
- return 1;
- 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
-
-#ifndef CONFIG_EXCEPTION_L1_SCRATCH
- if (in_mem_const(addr, size, (unsigned long)l1_stack_base, l1_stack_len))
- 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);
-#endif /* CONFIG_ACCESS_CHECK */
git.samba.org / sfrench / cifs-2.6.git / blobdiff