diff options
Diffstat (limited to 'arch/arm26/kernel/process.c')
| -rw-r--r-- | arch/arm26/kernel/process.c | 392 |
1 files changed, 0 insertions, 392 deletions
diff --git a/arch/arm26/kernel/process.c b/arch/arm26/kernel/process.c deleted file mode 100644 index dcd81e62ff4e..000000000000 --- a/arch/arm26/kernel/process.c +++ /dev/null @@ -1,392 +0,0 @@ -/* - * linux/arch/arm26/kernel/process.c - * - * Copyright (C) 2003 Ian Molton - adapted for ARM26 - * Copyright (C) 1996-2000 Russell King - Converted to ARM. - * Origional Copyright (C) 1995 Linus Torvalds - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#include <stdarg.h> - -#include <linux/module.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/stddef.h> -#include <linux/unistd.h> -#include <linux/ptrace.h> -#include <linux/slab.h> -#include <linux/user.h> -#include <linux/a.out.h> -#include <linux/delay.h> -#include <linux/reboot.h> -#include <linux/interrupt.h> -#include <linux/init.h> - -#include <asm/system.h> -#include <asm/io.h> -#include <asm/leds.h> -#include <asm/processor.h> -#include <asm/uaccess.h> - -extern const char *processor_modes[]; -extern void setup_mm_for_reboot(char mode); - -static volatile int hlt_counter; - -void disable_hlt(void) -{ - hlt_counter++; -} - -EXPORT_SYMBOL(disable_hlt); - -void enable_hlt(void) -{ - hlt_counter--; -} - -EXPORT_SYMBOL(enable_hlt); - -static int __init nohlt_setup(char *__unused) -{ - hlt_counter = 1; - return 1; -} - -static int __init hlt_setup(char *__unused) -{ - hlt_counter = 0; - return 1; -} - -__setup("nohlt", nohlt_setup); -__setup("hlt", hlt_setup); - -/* - * This is our default idle handler. We need to disable - * interrupts here to ensure we don't miss a wakeup call. - */ -void cpu_idle(void) -{ - /* endless idle loop with no priority at all */ - while (1) { - while (!need_resched()) - cpu_relax(); - preempt_enable_no_resched(); - schedule(); - preempt_disable(); - } -} - -static char reboot_mode = 'h'; - -int __init reboot_setup(char *str) -{ - reboot_mode = str[0]; - return 1; -} - -__setup("reboot=", reboot_setup); - -/* ARM26 cant do these but we still need to define them. */ -void machine_halt(void) -{ -} -void machine_power_off(void) -{ -} - -void machine_restart(char * __unused) -{ - /* - * Clean and disable cache, and turn off interrupts - */ - cpu_proc_fin(); - - /* - * Tell the mm system that we are going to reboot - - * we may need it to insert some 1:1 mappings so that - * soft boot works. - */ - setup_mm_for_reboot(reboot_mode); - - /* - * copy branch instruction to reset location and call it - */ - - *(unsigned long *)0 = *(unsigned long *)0x03800000; - ((void(*)(void))0)(); - - /* - * Whoops - the architecture was unable to reboot. - * Tell the user! Should never happen... - */ - mdelay(1000); - printk("Reboot failed -- System halted\n"); - while (1); -} - -void show_regs(struct pt_regs * regs) -{ - unsigned long flags; - - flags = condition_codes(regs); - - printk("pc : [<%08lx>] lr : [<%08lx>] %s\n" - "sp : %08lx ip : %08lx fp : %08lx\n", - instruction_pointer(regs), - regs->ARM_lr, print_tainted(), regs->ARM_sp, - regs->ARM_ip, regs->ARM_fp); - printk("r10: %08lx r9 : %08lx r8 : %08lx\n", - regs->ARM_r10, regs->ARM_r9, - regs->ARM_r8); - printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", - regs->ARM_r7, regs->ARM_r6, - regs->ARM_r5, regs->ARM_r4); - printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", - regs->ARM_r3, regs->ARM_r2, - regs->ARM_r1, regs->ARM_r0); - printk("Flags: %c%c%c%c", - flags & PSR_N_BIT ? 'N' : 'n', - flags & PSR_Z_BIT ? 'Z' : 'z', - flags & PSR_C_BIT ? 'C' : 'c', - flags & PSR_V_BIT ? 'V' : 'v'); - printk(" IRQs o%s FIQs o%s Mode %s Segment %s\n", - interrupts_enabled(regs) ? "n" : "ff", - fast_interrupts_enabled(regs) ? "n" : "ff", - processor_modes[processor_mode(regs)], - get_fs() == get_ds() ? "kernel" : "user"); -} - -void show_fpregs(struct user_fp *regs) -{ - int i; - - for (i = 0; i < 8; i++) { - unsigned long *p; - char type; - - p = (unsigned long *)(regs->fpregs + i); - - switch (regs->ftype[i]) { - case 1: type = 'f'; break; - case 2: type = 'd'; break; - case 3: type = 'e'; break; - default: type = '?'; break; - } - if (regs->init_flag) - type = '?'; - - printk(" f%d(%c): %08lx %08lx %08lx%c", - i, type, p[0], p[1], p[2], i & 1 ? '\n' : ' '); - } - - - printk("FPSR: %08lx FPCR: %08lx\n", - (unsigned long)regs->fpsr, - (unsigned long)regs->fpcr); -} - -/* - * Task structure and kernel stack allocation. - */ -static unsigned long *thread_info_head; -static unsigned int nr_thread_info; - -extern unsigned long get_page_8k(int priority); -extern void free_page_8k(unsigned long page); - -// FIXME - is this valid? -#define EXTRA_TASK_STRUCT 0 -#define ll_alloc_task_struct() ((struct thread_info *)get_page_8k(GFP_KERNEL)) -#define ll_free_task_struct(p) free_page_8k((unsigned long)(p)) - -//FIXME - do we use *task param below looks like we dont, which is ok? -//FIXME - if EXTRA_TASK_STRUCT is zero we can optimise the below away permanently. *IF* its supposed to be zero. -struct thread_info *alloc_thread_info(struct task_struct *task) -{ - struct thread_info *thread = NULL; - - if (EXTRA_TASK_STRUCT) { - unsigned long *p = thread_info_head; - - if (p) { - thread_info_head = (unsigned long *)p[0]; - nr_thread_info -= 1; - } - thread = (struct thread_info *)p; - } - - if (!thread) - thread = ll_alloc_task_struct(); - -#ifdef CONFIG_MAGIC_SYSRQ - /* - * The stack must be cleared if you want SYSRQ-T to - * give sensible stack usage information - */ - if (thread) { - char *p = (char *)thread; - memzero(p+KERNEL_STACK_SIZE, KERNEL_STACK_SIZE); - } -#endif - return thread; -} - -void free_thread_info(struct thread_info *thread) -{ - if (EXTRA_TASK_STRUCT && nr_thread_info < EXTRA_TASK_STRUCT) { - unsigned long *p = (unsigned long *)thread; - p[0] = (unsigned long)thread_info_head; - thread_info_head = p; - nr_thread_info += 1; - } else - ll_free_task_struct(thread); -} - -/* - * Free current thread data structures etc.. - */ -void exit_thread(void) -{ -} - -void flush_thread(void) -{ - struct thread_info *thread = current_thread_info(); - struct task_struct *tsk = current; - - memset(&tsk->thread.debug, 0, sizeof(struct debug_info)); - memset(&thread->fpstate, 0, sizeof(union fp_state)); - - clear_used_math(); -} - -void release_thread(struct task_struct *dead_task) -{ -} - -asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); - -int -copy_thread(int nr, unsigned long clone_flags, unsigned long stack_start, - unsigned long unused, struct task_struct *p, struct pt_regs *regs) -{ - struct thread_info *thread = task_thread_info(p); - struct pt_regs *childregs = task_pt_regs(p); - - *childregs = *regs; - childregs->ARM_r0 = 0; - childregs->ARM_sp = stack_start; - - memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save)); - thread->cpu_context.sp = (unsigned long)childregs; - thread->cpu_context.pc = (unsigned long)ret_from_fork | MODE_SVC26 | PSR_I_BIT; - - return 0; -} - -/* - * fill in the fpe structure for a core dump... - */ -int dump_fpu (struct pt_regs *regs, struct user_fp *fp) -{ - struct thread_info *thread = current_thread_info(); - int used_math = !!used_math(); - - if (used_math) - memcpy(fp, &thread->fpstate.soft, sizeof (*fp)); - - return used_math; -} - -/* - * fill in the user structure for a core dump.. - */ -void dump_thread(struct pt_regs * regs, struct user * dump) -{ - struct task_struct *tsk = current; - - dump->magic = CMAGIC; - dump->start_code = tsk->mm->start_code; - dump->start_stack = regs->ARM_sp & ~(PAGE_SIZE - 1); - - dump->u_tsize = (tsk->mm->end_code - tsk->mm->start_code) >> PAGE_SHIFT; - dump->u_dsize = (tsk->mm->brk - tsk->mm->start_data + PAGE_SIZE - 1) >> PAGE_SHIFT; - dump->u_ssize = 0; - - dump->u_debugreg[0] = tsk->thread.debug.bp[0].address; - dump->u_debugreg[1] = tsk->thread.debug.bp[1].address; - dump->u_debugreg[2] = tsk->thread.debug.bp[0].insn; - dump->u_debugreg[3] = tsk->thread.debug.bp[1].insn; - dump->u_debugreg[4] = tsk->thread.debug.nsaved; - - if (dump->start_stack < 0x04000000) - dump->u_ssize = (0x04000000 - dump->start_stack) >> PAGE_SHIFT; - - dump->regs = *regs; - dump->u_fpvalid = dump_fpu (regs, &dump->u_fp); -} - -/* - * Shuffle the argument into the correct register before calling the - * thread function. r1 is the thread argument, r2 is the pointer to - * the thread function, and r3 points to the exit function. - * FIXME - make sure this is right - the older code used to zero fp - * and cause the parent to call sys_exit (do_exit in this version) - */ -extern void kernel_thread_helper(void); - -asm( ".section .text\n" -" .align\n" -" .type kernel_thread_helper, #function\n" -"kernel_thread_helper:\n" -" mov r0, r1\n" -" mov lr, r3\n" -" mov pc, r2\n" -" .size kernel_thread_helper, . - kernel_thread_helper\n" -" .previous"); - -/* - * Create a kernel thread. - */ -pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) -{ - struct pt_regs regs; - - memset(®s, 0, sizeof(regs)); - - regs.ARM_r1 = (unsigned long)arg; - regs.ARM_r2 = (unsigned long)fn; - regs.ARM_r3 = (unsigned long)do_exit; - regs.ARM_pc = (unsigned long)kernel_thread_helper | MODE_SVC26; - - return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL); -} -EXPORT_SYMBOL(kernel_thread); - - -unsigned long get_wchan(struct task_struct *p) -{ - unsigned long fp, lr; - unsigned long stack_page; - int count = 0; - if (!p || p == current || p->state == TASK_RUNNING) - return 0; - - stack_page = 4096 + (unsigned long)p; - fp = thread_saved_fp(p); - do { - if (fp < stack_page || fp > 4092+stack_page) - return 0; - lr = pc_pointer (((unsigned long *)fp)[-1]); - if (!in_sched_functions(lr)) - return lr; - fp = *(unsigned long *) (fp - 12); - } while (count ++ < 16); - return 0; -} |