diff options
Diffstat (limited to 'arch/blackfin/kernel/process.c')
| -rw-r--r-- | arch/blackfin/kernel/process.c | 438 |
1 files changed, 0 insertions, 438 deletions
diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c deleted file mode 100644 index 89814850b08b..000000000000 --- a/arch/blackfin/kernel/process.c +++ /dev/null @@ -1,438 +0,0 @@ -/* - * 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 */ |