diff options
Diffstat (limited to 'arch/metag/kernel/process.c')
| -rw-r--r-- | arch/metag/kernel/process.c | 448 |
1 files changed, 0 insertions, 448 deletions
diff --git a/arch/metag/kernel/process.c b/arch/metag/kernel/process.c deleted file mode 100644 index 0909834c83a7..000000000000 --- a/arch/metag/kernel/process.c +++ /dev/null @@ -1,448 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2005,2006,2007,2008,2009,2010,2011 Imagination Technologies - * - * This file contains the architecture-dependent parts of process handling. - * - */ - -#include <linux/errno.h> -#include <linux/export.h> -#include <linux/sched.h> -#include <linux/sched/debug.h> -#include <linux/sched/task.h> -#include <linux/sched/task_stack.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/unistd.h> -#include <linux/ptrace.h> -#include <linux/user.h> -#include <linux/reboot.h> -#include <linux/elfcore.h> -#include <linux/fs.h> -#include <linux/tick.h> -#include <linux/slab.h> -#include <linux/mman.h> -#include <linux/pm.h> -#include <linux/syscalls.h> -#include <linux/uaccess.h> -#include <linux/smp.h> -#include <asm/core_reg.h> -#include <asm/user_gateway.h> -#include <asm/tcm.h> -#include <asm/traps.h> -#include <asm/switch_to.h> - -/* - * Wait for the next interrupt and enable local interrupts - */ -void arch_cpu_idle(void) -{ - int tmp; - - /* - * Quickly jump straight into the interrupt entry point without actually - * triggering an interrupt. When TXSTATI gets read the processor will - * block until an interrupt is triggered. - */ - asm volatile (/* Switch into ISTAT mode */ - "RTH\n\t" - /* Enable local interrupts */ - "MOV TXMASKI, %1\n\t" - /* - * We can't directly "SWAP PC, PCX", so we swap via a - * temporary. Essentially we do: - * PCX_new = 1f (the place to continue execution) - * PC = PCX_old - */ - "ADD %0, CPC0, #(1f-.)\n\t" - "SWAP PCX, %0\n\t" - "MOV PC, %0\n" - /* Continue execution here with interrupts enabled */ - "1:" - : "=a" (tmp) - : "r" (get_trigger_mask())); -} - -#ifdef CONFIG_HOTPLUG_CPU -void arch_cpu_idle_dead(void) -{ - cpu_die(); -} -#endif - -void (*pm_power_off)(void); -EXPORT_SYMBOL(pm_power_off); - -void (*soc_restart)(char *cmd); -void (*soc_halt)(void); - -void machine_restart(char *cmd) -{ - if (soc_restart) - soc_restart(cmd); - hard_processor_halt(HALT_OK); -} - -void machine_halt(void) -{ - if (soc_halt) - soc_halt(); - smp_send_stop(); - hard_processor_halt(HALT_OK); -} - -void machine_power_off(void) -{ - if (pm_power_off) - pm_power_off(); - smp_send_stop(); - hard_processor_halt(HALT_OK); -} - -#define FLAG_Z 0x8 -#define FLAG_N 0x4 -#define FLAG_O 0x2 -#define FLAG_C 0x1 - -void show_regs(struct pt_regs *regs) -{ - int i; - const char *AX0_names[] = {"A0StP", "A0FrP"}; - const char *AX1_names[] = {"A1GbP", "A1LbP"}; - - const char *DX0_names[] = { - "D0Re0", - "D0Ar6", - "D0Ar4", - "D0Ar2", - "D0FrT", - "D0.5 ", - "D0.6 ", - "D0.7 " - }; - - const char *DX1_names[] = { - "D1Re0", - "D1Ar5", - "D1Ar3", - "D1Ar1", - "D1RtP", - "D1.5 ", - "D1.6 ", - "D1.7 " - }; - - show_regs_print_info(KERN_INFO); - - pr_info(" pt_regs @ %p\n", regs); - pr_info(" SaveMask = 0x%04hx\n", regs->ctx.SaveMask); - pr_info(" Flags = 0x%04hx (%c%c%c%c)\n", regs->ctx.Flags, - regs->ctx.Flags & FLAG_Z ? 'Z' : 'z', - regs->ctx.Flags & FLAG_N ? 'N' : 'n', - regs->ctx.Flags & FLAG_O ? 'O' : 'o', - regs->ctx.Flags & FLAG_C ? 'C' : 'c'); - pr_info(" TXRPT = 0x%08x\n", regs->ctx.CurrRPT); - pr_info(" PC = 0x%08x\n", regs->ctx.CurrPC); - - /* AX regs */ - for (i = 0; i < 2; i++) { - pr_info(" %s = 0x%08x ", - AX0_names[i], - regs->ctx.AX[i].U0); - printk(" %s = 0x%08x\n", - AX1_names[i], - regs->ctx.AX[i].U1); - } - - if (regs->ctx.SaveMask & TBICTX_XEXT_BIT) - pr_warn(" Extended state present - AX2.[01] will be WRONG\n"); - - /* Special place with AXx.2 */ - pr_info(" A0.2 = 0x%08x ", - regs->ctx.Ext.AX2.U0); - printk(" A1.2 = 0x%08x\n", - regs->ctx.Ext.AX2.U1); - - /* 'extended' AX regs (nominally, just AXx.3) */ - for (i = 0; i < (TBICTX_AX_REGS - 3); i++) { - pr_info(" A0.%d = 0x%08x ", i + 3, regs->ctx.AX3[i].U0); - printk(" A1.%d = 0x%08x\n", i + 3, regs->ctx.AX3[i].U1); - } - - for (i = 0; i < 8; i++) { - pr_info(" %s = 0x%08x ", DX0_names[i], regs->ctx.DX[i].U0); - printk(" %s = 0x%08x\n", DX1_names[i], regs->ctx.DX[i].U1); - } - - show_trace(NULL, (unsigned long *)regs->ctx.AX[0].U0, regs); -} - -/* - * Copy architecture-specific thread state - */ -int copy_thread(unsigned long clone_flags, unsigned long usp, - unsigned long kthread_arg, struct task_struct *tsk) -{ - struct pt_regs *childregs = task_pt_regs(tsk); - void *kernel_context = ((void *) childregs + - sizeof(struct pt_regs)); - unsigned long global_base; - - BUG_ON(((unsigned long)childregs) & 0x7); - BUG_ON(((unsigned long)kernel_context) & 0x7); - - memset(&tsk->thread.kernel_context, 0, - sizeof(tsk->thread.kernel_context)); - - tsk->thread.kernel_context = __TBISwitchInit(kernel_context, - ret_from_fork, - 0, 0); - - if (unlikely(tsk->flags & PF_KTHREAD)) { - /* - * Make sure we don't leak any kernel data to child's regs - * if kernel thread becomes a userspace thread in the future - */ - memset(childregs, 0 , sizeof(struct pt_regs)); - - global_base = __core_reg_get(A1GbP); - childregs->ctx.AX[0].U1 = (unsigned long) global_base; - childregs->ctx.AX[0].U0 = (unsigned long) kernel_context; - /* Set D1Ar1=kthread_arg and D1RtP=usp (fn) */ - childregs->ctx.DX[4].U1 = usp; - childregs->ctx.DX[3].U1 = kthread_arg; - tsk->thread.int_depth = 2; - return 0; - } - - /* - * Get a pointer to where the new child's register block should have - * been pushed. - * The Meta's stack grows upwards, and the context is the the first - * thing to be pushed by TBX (phew) - */ - *childregs = *current_pt_regs(); - /* Set the correct stack for the clone mode */ - if (usp) - childregs->ctx.AX[0].U0 = ALIGN(usp, 8); - tsk->thread.int_depth = 1; - - /* set return value for child process */ - childregs->ctx.DX[0].U0 = 0; - - /* The TLS pointer is passed as an argument to sys_clone. */ - if (clone_flags & CLONE_SETTLS) - tsk->thread.tls_ptr = - (__force void __user *)childregs->ctx.DX[1].U1; - -#ifdef CONFIG_METAG_FPU - if (tsk->thread.fpu_context) { - struct meta_fpu_context *ctx; - - ctx = kmemdup(tsk->thread.fpu_context, - sizeof(struct meta_fpu_context), GFP_ATOMIC); - tsk->thread.fpu_context = ctx; - } -#endif - -#ifdef CONFIG_METAG_DSP - if (tsk->thread.dsp_context) { - struct meta_ext_context *ctx; - int i; - - ctx = kmemdup(tsk->thread.dsp_context, - sizeof(struct meta_ext_context), GFP_ATOMIC); - for (i = 0; i < 2; i++) - ctx->ram[i] = kmemdup(ctx->ram[i], ctx->ram_sz[i], - GFP_ATOMIC); - tsk->thread.dsp_context = ctx; - } -#endif - - return 0; -} - -#ifdef CONFIG_METAG_FPU -static void alloc_fpu_context(struct thread_struct *thread) -{ - thread->fpu_context = kzalloc(sizeof(struct meta_fpu_context), - GFP_ATOMIC); -} - -static void clear_fpu(struct thread_struct *thread) -{ - thread->user_flags &= ~TBICTX_FPAC_BIT; - kfree(thread->fpu_context); - thread->fpu_context = NULL; -} -#else -static void clear_fpu(struct thread_struct *thread) -{ -} -#endif - -#ifdef CONFIG_METAG_DSP -static void clear_dsp(struct thread_struct *thread) -{ - if (thread->dsp_context) { - kfree(thread->dsp_context->ram[0]); - kfree(thread->dsp_context->ram[1]); - - kfree(thread->dsp_context); - - thread->dsp_context = NULL; - } - - __core_reg_set(D0.8, 0); -} -#else -static void clear_dsp(struct thread_struct *thread) -{ -} -#endif - -struct task_struct *__sched __switch_to(struct task_struct *prev, - struct task_struct *next) -{ - TBIRES to, from; - - to.Switch.pCtx = next->thread.kernel_context; - to.Switch.pPara = prev; - -#ifdef CONFIG_METAG_FPU - if (prev->thread.user_flags & TBICTX_FPAC_BIT) { - struct pt_regs *regs = task_pt_regs(prev); - TBIRES state; - - state.Sig.SaveMask = prev->thread.user_flags; - state.Sig.pCtx = ®s->ctx; - - if (!prev->thread.fpu_context) - alloc_fpu_context(&prev->thread); - if (prev->thread.fpu_context) - __TBICtxFPUSave(state, prev->thread.fpu_context); - } - /* - * Force a restore of the FPU context next time this process is - * scheduled. - */ - if (prev->thread.fpu_context) - prev->thread.fpu_context->needs_restore = true; -#endif - - - from = __TBISwitch(to, &prev->thread.kernel_context); - - /* Restore TLS pointer for this process. */ - set_gateway_tls(current->thread.tls_ptr); - - return (struct task_struct *) from.Switch.pPara; -} - -void flush_thread(void) -{ - clear_fpu(¤t->thread); - clear_dsp(¤t->thread); -} - -/* - * Free current thread data structures etc. - */ -void exit_thread(struct task_struct *tsk) -{ - clear_fpu(&tsk->thread); - clear_dsp(&tsk->thread); -} - -/* TODO: figure out how to unwind the kernel stack here to figure out - * where we went to sleep. */ -unsigned long get_wchan(struct task_struct *p) -{ - return 0; -} - -int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) -{ - /* Returning 0 indicates that the FPU state was not stored (as it was - * not in use) */ - return 0; -} - -#ifdef CONFIG_METAG_USER_TCM - -#define ELF_MIN_ALIGN PAGE_SIZE - -#define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1)) -#define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) -#define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) - -#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE) - -unsigned long __metag_elf_map(struct file *filep, unsigned long addr, - struct elf_phdr *eppnt, int prot, int type, - unsigned long total_size) -{ - unsigned long map_addr, size; - unsigned long page_off = ELF_PAGEOFFSET(eppnt->p_vaddr); - unsigned long raw_size = eppnt->p_filesz + page_off; - unsigned long off = eppnt->p_offset - page_off; - unsigned int tcm_tag; - addr = ELF_PAGESTART(addr); - size = ELF_PAGEALIGN(raw_size); - - /* mmap() will return -EINVAL if given a zero size, but a - * segment with zero filesize is perfectly valid */ - if (!size) - return addr; - - tcm_tag = tcm_lookup_tag(addr); - - if (tcm_tag != TCM_INVALID_TAG) - type &= ~MAP_FIXED; - - /* - * total_size is the size of the ELF (interpreter) image. - * The _first_ mmap needs to know the full size, otherwise - * randomization might put this image into an overlapping - * position with the ELF binary image. (since size < total_size) - * So we first map the 'big' image - and unmap the remainder at - * the end. (which unmap is needed for ELF images with holes.) - */ - if (total_size) { - total_size = ELF_PAGEALIGN(total_size); - map_addr = vm_mmap(filep, addr, total_size, prot, type, off); - if (!BAD_ADDR(map_addr)) - vm_munmap(map_addr+size, total_size-size); - } else - map_addr = vm_mmap(filep, addr, size, prot, type, off); - - if (!BAD_ADDR(map_addr) && tcm_tag != TCM_INVALID_TAG) { - struct tcm_allocation *tcm; - unsigned long tcm_addr; - - tcm = kmalloc(sizeof(*tcm), GFP_KERNEL); - if (!tcm) - return -ENOMEM; - - tcm_addr = tcm_alloc(tcm_tag, raw_size); - if (tcm_addr != addr) { - kfree(tcm); - return -ENOMEM; - } - - tcm->tag = tcm_tag; - tcm->addr = tcm_addr; - tcm->size = raw_size; - - list_add(&tcm->list, ¤t->mm->context.tcm); - - eppnt->p_vaddr = map_addr; - if (copy_from_user((void *) addr, (void __user *) map_addr, - raw_size)) - return -EFAULT; - } - - return map_addr; -} -#endif |