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-rw-r--r--arch/ppc/kernel/process.c781
1 files changed, 781 insertions, 0 deletions
diff --git a/arch/ppc/kernel/process.c b/arch/ppc/kernel/process.c
new file mode 100644
index 00000000000..82de66e4db6
--- /dev/null
+++ b/arch/ppc/kernel/process.c
@@ -0,0 +1,781 @@
+/*
+ * arch/ppc/kernel/process.c
+ *
+ * Derived from "arch/i386/kernel/process.c"
+ * Copyright (C) 1995 Linus Torvalds
+ *
+ * Updated and modified by Cort Dougan (cort@cs.nmt.edu) and
+ * Paul Mackerras (paulus@cs.anu.edu.au)
+ *
+ * PowerPC version
+ * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.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.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/user.h>
+#include <linux/elf.h>
+#include <linux/init.h>
+#include <linux/prctl.h>
+#include <linux/init_task.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/mqueue.h>
+#include <linux/hardirq.h>
+
+#include <asm/pgtable.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/mmu.h>
+#include <asm/prom.h>
+
+extern unsigned long _get_SP(void);
+
+struct task_struct *last_task_used_math = NULL;
+struct task_struct *last_task_used_altivec = NULL;
+struct task_struct *last_task_used_spe = NULL;
+
+static struct fs_struct init_fs = INIT_FS;
+static struct files_struct init_files = INIT_FILES;
+static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
+static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
+struct mm_struct init_mm = INIT_MM(init_mm);
+EXPORT_SYMBOL(init_mm);
+
+/* this is 8kB-aligned so we can get to the thread_info struct
+ at the base of it from the stack pointer with 1 integer instruction. */
+union thread_union init_thread_union
+ __attribute__((__section__(".data.init_task"))) =
+{ INIT_THREAD_INFO(init_task) };
+
+/* initial task structure */
+struct task_struct init_task = INIT_TASK(init_task);
+EXPORT_SYMBOL(init_task);
+
+/* only used to get secondary processor up */
+struct task_struct *current_set[NR_CPUS] = {&init_task, };
+
+#undef SHOW_TASK_SWITCHES
+#undef CHECK_STACK
+
+#if defined(CHECK_STACK)
+unsigned long
+kernel_stack_top(struct task_struct *tsk)
+{
+ return ((unsigned long)tsk) + sizeof(union task_union);
+}
+
+unsigned long
+task_top(struct task_struct *tsk)
+{
+ return ((unsigned long)tsk) + sizeof(struct thread_info);
+}
+
+/* check to make sure the kernel stack is healthy */
+int check_stack(struct task_struct *tsk)
+{
+ unsigned long stack_top = kernel_stack_top(tsk);
+ unsigned long tsk_top = task_top(tsk);
+ int ret = 0;
+
+#if 0
+ /* check thread magic */
+ if ( tsk->thread.magic != THREAD_MAGIC )
+ {
+ ret |= 1;
+ printk("thread.magic bad: %08x\n", tsk->thread.magic);
+ }
+#endif
+
+ if ( !tsk )
+ printk("check_stack(): tsk bad tsk %p\n",tsk);
+
+ /* check if stored ksp is bad */
+ if ( (tsk->thread.ksp > stack_top) || (tsk->thread.ksp < tsk_top) )
+ {
+ printk("stack out of bounds: %s/%d\n"
+ " tsk_top %08lx ksp %08lx stack_top %08lx\n",
+ tsk->comm,tsk->pid,
+ tsk_top, tsk->thread.ksp, stack_top);
+ ret |= 2;
+ }
+
+ /* check if stack ptr RIGHT NOW is bad */
+ if ( (tsk == current) && ((_get_SP() > stack_top ) || (_get_SP() < tsk_top)) )
+ {
+ printk("current stack ptr out of bounds: %s/%d\n"
+ " tsk_top %08lx sp %08lx stack_top %08lx\n",
+ current->comm,current->pid,
+ tsk_top, _get_SP(), stack_top);
+ ret |= 4;
+ }
+
+#if 0
+ /* check amount of free stack */
+ for ( i = (unsigned long *)task_top(tsk) ; i < kernel_stack_top(tsk) ; i++ )
+ {
+ if ( !i )
+ printk("check_stack(): i = %p\n", i);
+ if ( *i != 0 )
+ {
+ /* only notify if it's less than 900 bytes */
+ if ( (i - (unsigned long *)task_top(tsk)) < 900 )
+ printk("%d bytes free on stack\n",
+ i - task_top(tsk));
+ break;
+ }
+ }
+#endif
+
+ if (ret)
+ {
+ panic("bad kernel stack");
+ }
+ return(ret);
+}
+#endif /* defined(CHECK_STACK) */
+
+#ifdef CONFIG_ALTIVEC
+int
+dump_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs)
+{
+ if (regs->msr & MSR_VEC)
+ giveup_altivec(current);
+ memcpy(vrregs, &current->thread.vr[0], sizeof(*vrregs));
+ return 1;
+}
+
+void
+enable_kernel_altivec(void)
+{
+ WARN_ON(preemptible());
+
+#ifdef CONFIG_SMP
+ if (current->thread.regs && (current->thread.regs->msr & MSR_VEC))
+ giveup_altivec(current);
+ else
+ giveup_altivec(NULL); /* just enable AltiVec for kernel - force */
+#else
+ giveup_altivec(last_task_used_altivec);
+#endif /* __SMP __ */
+}
+EXPORT_SYMBOL(enable_kernel_altivec);
+#endif /* CONFIG_ALTIVEC */
+
+#ifdef CONFIG_SPE
+int
+dump_spe(struct pt_regs *regs, elf_vrregset_t *evrregs)
+{
+ if (regs->msr & MSR_SPE)
+ giveup_spe(current);
+ /* We copy u32 evr[32] + u64 acc + u32 spefscr -> 35 */
+ memcpy(evrregs, &current->thread.evr[0], sizeof(u32) * 35);
+ return 1;
+}
+
+void
+enable_kernel_spe(void)
+{
+ WARN_ON(preemptible());
+
+#ifdef CONFIG_SMP
+ if (current->thread.regs && (current->thread.regs->msr & MSR_SPE))
+ giveup_spe(current);
+ else
+ giveup_spe(NULL); /* just enable SPE for kernel - force */
+#else
+ giveup_spe(last_task_used_spe);
+#endif /* __SMP __ */
+}
+EXPORT_SYMBOL(enable_kernel_spe);
+#endif /* CONFIG_SPE */
+
+void
+enable_kernel_fp(void)
+{
+ WARN_ON(preemptible());
+
+#ifdef CONFIG_SMP
+ if (current->thread.regs && (current->thread.regs->msr & MSR_FP))
+ giveup_fpu(current);
+ else
+ giveup_fpu(NULL); /* just enables FP for kernel */
+#else
+ giveup_fpu(last_task_used_math);
+#endif /* CONFIG_SMP */
+}
+EXPORT_SYMBOL(enable_kernel_fp);
+
+int
+dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs)
+{
+ preempt_disable();
+ if (tsk->thread.regs && (tsk->thread.regs->msr & MSR_FP))
+ giveup_fpu(tsk);
+ preempt_enable();
+ memcpy(fpregs, &tsk->thread.fpr[0], sizeof(*fpregs));
+ return 1;
+}
+
+struct task_struct *__switch_to(struct task_struct *prev,
+ struct task_struct *new)
+{
+ struct thread_struct *new_thread, *old_thread;
+ unsigned long s;
+ struct task_struct *last;
+
+ local_irq_save(s);
+#ifdef CHECK_STACK
+ check_stack(prev);
+ check_stack(new);
+#endif
+
+#ifdef CONFIG_SMP
+ /* avoid complexity of lazy save/restore of fpu
+ * by just saving it every time we switch out if
+ * this task used the fpu during the last quantum.
+ *
+ * If it tries to use the fpu again, it'll trap and
+ * reload its fp regs. So we don't have to do a restore
+ * every switch, just a save.
+ * -- Cort
+ */
+ if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP))
+ giveup_fpu(prev);
+#ifdef CONFIG_ALTIVEC
+ /*
+ * If the previous thread used altivec in the last quantum
+ * (thus changing altivec regs) then save them.
+ * We used to check the VRSAVE register but not all apps
+ * set it, so we don't rely on it now (and in fact we need
+ * to save & restore VSCR even if VRSAVE == 0). -- paulus
+ *
+ * On SMP we always save/restore altivec regs just to avoid the
+ * complexity of changing processors.
+ * -- Cort
+ */
+ if ((prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)))
+ giveup_altivec(prev);
+#endif /* CONFIG_ALTIVEC */
+#ifdef CONFIG_SPE
+ /*
+ * If the previous thread used spe in the last quantum
+ * (thus changing spe regs) then save them.
+ *
+ * On SMP we always save/restore spe regs just to avoid the
+ * complexity of changing processors.
+ */
+ if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE)))
+ giveup_spe(prev);
+#endif /* CONFIG_SPE */
+#endif /* CONFIG_SMP */
+
+ /* Avoid the trap. On smp this this never happens since
+ * we don't set last_task_used_altivec -- Cort
+ */
+ if (new->thread.regs && last_task_used_altivec == new)
+ new->thread.regs->msr |= MSR_VEC;
+#ifdef CONFIG_SPE
+ /* Avoid the trap. On smp this this never happens since
+ * we don't set last_task_used_spe
+ */
+ if (new->thread.regs && last_task_used_spe == new)
+ new->thread.regs->msr |= MSR_SPE;
+#endif /* CONFIG_SPE */
+ new_thread = &new->thread;
+ old_thread = &current->thread;
+ last = _switch(old_thread, new_thread);
+ local_irq_restore(s);
+ return last;
+}
+
+void show_regs(struct pt_regs * regs)
+{
+ int i, trap;
+
+ printk("NIP: %08lX LR: %08lX SP: %08lX REGS: %p TRAP: %04lx %s\n",
+ regs->nip, regs->link, regs->gpr[1], regs, regs->trap,
+ print_tainted());
+ printk("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
+ regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
+ regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
+ regs->msr&MSR_IR ? 1 : 0,
+ regs->msr&MSR_DR ? 1 : 0);
+ trap = TRAP(regs);
+ if (trap == 0x300 || trap == 0x600)
+ printk("DAR: %08lX, DSISR: %08lX\n", regs->dar, regs->dsisr);
+ printk("TASK = %p[%d] '%s' THREAD: %p\n",
+ current, current->pid, current->comm, current->thread_info);
+ printk("Last syscall: %ld ", current->thread.last_syscall);
+
+#ifdef CONFIG_SMP
+ printk(" CPU: %d", smp_processor_id());
+#endif /* CONFIG_SMP */
+
+ for (i = 0; i < 32; i++) {
+ long r;
+ if ((i % 8) == 0)
+ printk("\n" KERN_INFO "GPR%02d: ", i);
+ if (__get_user(r, &regs->gpr[i]))
+ break;
+ printk("%08lX ", r);
+ if (i == 12 && !FULL_REGS(regs))
+ break;
+ }
+ printk("\n");
+#ifdef CONFIG_KALLSYMS
+ /*
+ * Lookup NIP late so we have the best change of getting the
+ * above info out without failing
+ */
+ printk("NIP [%08lx] ", regs->nip);
+ print_symbol("%s\n", regs->nip);
+ printk("LR [%08lx] ", regs->link);
+ print_symbol("%s\n", regs->link);
+#endif
+ show_stack(current, (unsigned long *) regs->gpr[1]);
+}
+
+void exit_thread(void)
+{
+ if (last_task_used_math == current)
+ last_task_used_math = NULL;
+ if (last_task_used_altivec == current)
+ last_task_used_altivec = NULL;
+#ifdef CONFIG_SPE
+ if (last_task_used_spe == current)
+ last_task_used_spe = NULL;
+#endif
+}
+
+void flush_thread(void)
+{
+ if (last_task_used_math == current)
+ last_task_used_math = NULL;
+ if (last_task_used_altivec == current)
+ last_task_used_altivec = NULL;
+#ifdef CONFIG_SPE
+ if (last_task_used_spe == current)
+ last_task_used_spe = NULL;
+#endif
+}
+
+void
+release_thread(struct task_struct *t)
+{
+}
+
+/*
+ * This gets called before we allocate a new thread and copy
+ * the current task into it.
+ */
+void prepare_to_copy(struct task_struct *tsk)
+{
+ struct pt_regs *regs = tsk->thread.regs;
+
+ if (regs == NULL)
+ return;
+ preempt_disable();
+ if (regs->msr & MSR_FP)
+ giveup_fpu(current);
+#ifdef CONFIG_ALTIVEC
+ if (regs->msr & MSR_VEC)
+ giveup_altivec(current);
+#endif /* CONFIG_ALTIVEC */
+#ifdef CONFIG_SPE
+ if (regs->msr & MSR_SPE)
+ giveup_spe(current);
+#endif /* CONFIG_SPE */
+ preempt_enable();
+}
+
+/*
+ * Copy a thread..
+ */
+int
+copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
+ unsigned long unused,
+ struct task_struct *p, struct pt_regs *regs)
+{
+ struct pt_regs *childregs, *kregs;
+ extern void ret_from_fork(void);
+ unsigned long sp = (unsigned long)p->thread_info + THREAD_SIZE;
+ unsigned long childframe;
+
+ CHECK_FULL_REGS(regs);
+ /* Copy registers */
+ sp -= sizeof(struct pt_regs);
+ childregs = (struct pt_regs *) sp;
+ *childregs = *regs;
+ if ((childregs->msr & MSR_PR) == 0) {
+ /* for kernel thread, set `current' and stackptr in new task */
+ childregs->gpr[1] = sp + sizeof(struct pt_regs);
+ childregs->gpr[2] = (unsigned long) p;
+ p->thread.regs = NULL; /* no user register state */
+ } else {
+ childregs->gpr[1] = usp;
+ p->thread.regs = childregs;
+ if (clone_flags & CLONE_SETTLS)
+ childregs->gpr[2] = childregs->gpr[6];
+ }
+ childregs->gpr[3] = 0; /* Result from fork() */
+ sp -= STACK_FRAME_OVERHEAD;
+ childframe = sp;
+
+ /*
+ * The way this works is that at some point in the future
+ * some task will call _switch to switch to the new task.
+ * That will pop off the stack frame created below and start
+ * the new task running at ret_from_fork. The new task will
+ * do some house keeping and then return from the fork or clone
+ * system call, using the stack frame created above.
+ */
+ sp -= sizeof(struct pt_regs);
+ kregs = (struct pt_regs *) sp;
+ sp -= STACK_FRAME_OVERHEAD;
+ p->thread.ksp = sp;
+ kregs->nip = (unsigned long)ret_from_fork;
+
+ p->thread.last_syscall = -1;
+
+ return 0;
+}
+
+/*
+ * Set up a thread for executing a new program
+ */
+void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp)
+{
+ set_fs(USER_DS);
+ memset(regs->gpr, 0, sizeof(regs->gpr));
+ regs->ctr = 0;
+ regs->link = 0;
+ regs->xer = 0;
+ regs->ccr = 0;
+ regs->mq = 0;
+ regs->nip = nip;
+ regs->gpr[1] = sp;
+ regs->msr = MSR_USER;
+ if (last_task_used_math == current)
+ last_task_used_math = NULL;
+ if (last_task_used_altivec == current)
+ last_task_used_altivec = NULL;
+#ifdef CONFIG_SPE
+ if (last_task_used_spe == current)
+ last_task_used_spe = NULL;
+#endif
+ memset(current->thread.fpr, 0, sizeof(current->thread.fpr));
+ current->thread.fpscr = 0;
+#ifdef CONFIG_ALTIVEC
+ memset(current->thread.vr, 0, sizeof(current->thread.vr));
+ memset(&current->thread.vscr, 0, sizeof(current->thread.vscr));
+ current->thread.vrsave = 0;
+ current->thread.used_vr = 0;
+#endif /* CONFIG_ALTIVEC */
+#ifdef CONFIG_SPE
+ memset(current->thread.evr, 0, sizeof(current->thread.evr));
+ current->thread.acc = 0;
+ current->thread.spefscr = 0;
+ current->thread.used_spe = 0;
+#endif /* CONFIG_SPE */
+}
+
+#define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \
+ | PR_FP_EXC_RES | PR_FP_EXC_INV)
+
+int set_fpexc_mode(struct task_struct *tsk, unsigned int val)
+{
+ struct pt_regs *regs = tsk->thread.regs;
+
+ /* This is a bit hairy. If we are an SPE enabled processor
+ * (have embedded fp) we store the IEEE exception enable flags in
+ * fpexc_mode. fpexc_mode is also used for setting FP exception
+ * mode (asyn, precise, disabled) for 'Classic' FP. */
+ if (val & PR_FP_EXC_SW_ENABLE) {
+#ifdef CONFIG_SPE
+ tsk->thread.fpexc_mode = val &
+ (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT);
+#else
+ return -EINVAL;
+#endif
+ } else {
+ /* on a CONFIG_SPE this does not hurt us. The bits that
+ * __pack_fe01 use do not overlap with bits used for
+ * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits
+ * on CONFIG_SPE implementations are reserved so writing to
+ * them does not change anything */
+ if (val > PR_FP_EXC_PRECISE)
+ return -EINVAL;
+ tsk->thread.fpexc_mode = __pack_fe01(val);
+ if (regs != NULL && (regs->msr & MSR_FP) != 0)
+ regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1))
+ | tsk->thread.fpexc_mode;
+ }
+ return 0;
+}
+
+int get_fpexc_mode(struct task_struct *tsk, unsigned long adr)
+{
+ unsigned int val;
+
+ if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE)
+#ifdef CONFIG_SPE
+ val = tsk->thread.fpexc_mode;
+#else
+ return -EINVAL;
+#endif
+ else
+ val = __unpack_fe01(tsk->thread.fpexc_mode);
+ return put_user(val, (unsigned int __user *) adr);
+}
+
+int sys_clone(unsigned long clone_flags, unsigned long usp,
+ int __user *parent_tidp, void __user *child_threadptr,
+ int __user *child_tidp, int p6,
+ struct pt_regs *regs)
+{
+ CHECK_FULL_REGS(regs);
+ if (usp == 0)
+ usp = regs->gpr[1]; /* stack pointer for child */
+ return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
+}
+
+int sys_fork(int p1, int p2, int p3, int p4, int p5, int p6,
+ struct pt_regs *regs)
+{
+ CHECK_FULL_REGS(regs);
+ return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL);
+}
+
+int sys_vfork(int p1, int p2, int p3, int p4, int p5, int p6,
+ struct pt_regs *regs)
+{
+ CHECK_FULL_REGS(regs);
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1],
+ regs, 0, NULL, NULL);
+}
+
+int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
+ unsigned long a3, unsigned long a4, unsigned long a5,
+ struct pt_regs *regs)
+{
+ int error;
+ char * filename;
+
+ filename = getname((char __user *) a0);
+ error = PTR_ERR(filename);
+ if (IS_ERR(filename))
+ goto out;
+ preempt_disable();
+ if (regs->msr & MSR_FP)
+ giveup_fpu(current);
+#ifdef CONFIG_ALTIVEC
+ if (regs->msr & MSR_VEC)
+ giveup_altivec(current);
+#endif /* CONFIG_ALTIVEC */
+#ifdef CONFIG_SPE
+ if (regs->msr & MSR_SPE)
+ giveup_spe(current);
+#endif /* CONFIG_SPE */
+ preempt_enable();
+ error = do_execve(filename, (char __user *__user *) a1,
+ (char __user *__user *) a2, regs);
+ if (error == 0) {
+ task_lock(current);
+ current->ptrace &= ~PT_DTRACE;
+ task_unlock(current);
+ }
+ putname(filename);
+out:
+ return error;
+}
+
+void dump_stack(void)
+{
+ show_stack(current, NULL);
+}
+
+EXPORT_SYMBOL(dump_stack);
+
+void show_stack(struct task_struct *tsk, unsigned long *stack)
+{
+ unsigned long sp, stack_top, prev_sp, ret;
+ int count = 0;
+ unsigned long next_exc = 0;
+ struct pt_regs *regs;
+ extern char ret_from_except, ret_from_except_full, ret_from_syscall;
+
+ sp = (unsigned long) stack;
+ if (tsk == NULL)
+ tsk = current;
+ if (sp == 0) {
+ if (tsk == current)
+ asm("mr %0,1" : "=r" (sp));
+ else
+ sp = tsk->thread.ksp;
+ }
+
+ prev_sp = (unsigned long) (tsk->thread_info + 1);
+ stack_top = (unsigned long) tsk->thread_info + THREAD_SIZE;
+ while (count < 16 && sp > prev_sp && sp < stack_top && (sp & 3) == 0) {
+ if (count == 0) {
+ printk("Call trace:");
+#ifdef CONFIG_KALLSYMS
+ printk("\n");
+#endif
+ } else {
+ if (next_exc) {
+ ret = next_exc;
+ next_exc = 0;
+ } else
+ ret = *(unsigned long *)(sp + 4);
+ printk(" [%08lx] ", ret);
+#ifdef CONFIG_KALLSYMS
+ print_symbol("%s", ret);
+ printk("\n");
+#endif
+ if (ret == (unsigned long) &ret_from_except
+ || ret == (unsigned long) &ret_from_except_full
+ || ret == (unsigned long) &ret_from_syscall) {
+ /* sp + 16 points to an exception frame */
+ regs = (struct pt_regs *) (sp + 16);
+ if (sp + 16 + sizeof(*regs) <= stack_top)
+ next_exc = regs->nip;
+ }
+ }
+ ++count;
+ sp = *(unsigned long *)sp;
+ }
+#ifndef CONFIG_KALLSYMS
+ if (count > 0)
+ printk("\n");
+#endif
+}
+
+#if 0
+/*
+ * Low level print for debugging - Cort
+ */
+int __init ll_printk(const char *fmt, ...)
+{
+ va_list args;
+ char buf[256];
+ int i;
+
+ va_start(args, fmt);
+ i=vsprintf(buf,fmt,args);
+ ll_puts(buf);
+ va_end(args);
+ return i;
+}
+
+int lines = 24, cols = 80;
+int orig_x = 0, orig_y = 0;
+
+void puthex(unsigned long val)
+{
+ unsigned char buf[10];
+ int i;
+ for (i = 7; i >= 0; i--)
+ {
+ buf[i] = "0123456789ABCDEF"[val & 0x0F];
+ val >>= 4;
+ }
+ buf[8] = '\0';
+ prom_print(buf);
+}
+
+void __init ll_puts(const char *s)
+{
+ int x,y;
+ char *vidmem = (char *)/*(_ISA_MEM_BASE + 0xB8000) */0xD00B8000;
+ char c;
+ extern int mem_init_done;
+
+ if ( mem_init_done ) /* assume this means we can printk */
+ {
+ printk(s);
+ return;
+ }
+
+#if 0
+ if ( have_of )
+ {
+ prom_print(s);
+ return;
+ }
+#endif
+
+ /*
+ * can't ll_puts on chrp without openfirmware yet.
+ * vidmem just needs to be setup for it.
+ * -- Cort
+ */
+ if ( _machine != _MACH_prep )
+ return;
+ x = orig_x;
+ y = orig_y;
+
+ while ( ( c = *s++ ) != '\0' ) {
+ if ( c == '\n' ) {
+ x = 0;
+ if ( ++y >= lines ) {
+ /*scroll();*/
+ /*y--;*/
+ y = 0;
+ }
+ } else {
+ vidmem [ ( x + cols * y ) * 2 ] = c;
+ if ( ++x >= cols ) {
+ x = 0;
+ if ( ++y >= lines ) {
+ /*scroll();*/
+ /*y--;*/
+ y = 0;
+ }
+ }
+ }
+ }
+
+ orig_x = x;
+ orig_y = y;
+}
+#endif
+
+unsigned long get_wchan(struct task_struct *p)
+{
+ unsigned long ip, sp;
+ unsigned long stack_page = (unsigned long) p->thread_info;
+ int count = 0;
+ if (!p || p == current || p->state == TASK_RUNNING)
+ return 0;
+ sp = p->thread.ksp;
+ do {
+ sp = *(unsigned long *)sp;
+ if (sp < stack_page || sp >= stack_page + 8188)
+ return 0;
+ if (count > 0) {
+ ip = *(unsigned long *)(sp + 4);
+ if (!in_sched_functions(ip))
+ return ip;
+ }
+ } while (count++ < 16);
+ return 0;
+}
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-16 21:16:26 +0000