diff options
| -rw-r--r-- | arch/sh64/kernel/process.c | 270 |
1 files changed, 13 insertions, 257 deletions
diff --git a/arch/sh64/kernel/process.c b/arch/sh64/kernel/process.c index db475b7..525d0ec 100644 --- a/arch/sh64/kernel/process.c +++ b/arch/sh64/kernel/process.c @@ -20,261 +20,16 @@ /* * This file handles the architecture-dependent parts of process handling.. */ - -/* Temporary flags/tests. All to be removed/undefined. BEGIN */ -#define IDLE_TRACE -#define VM_SHOW_TABLES -#define VM_TEST_FAULT -#define VM_TEST_RTLBMISS -#define VM_TEST_WTLBMISS - -#undef VM_SHOW_TABLES -#undef IDLE_TRACE -/* Temporary flags/tests. All to be removed/undefined. END */ - -#define __KERNEL_SYSCALLS__ -#include <stdarg.h> - -#include <linux/kernel.h> -#include <linux/rwsem.h> #include <linux/mm.h> -#include <linux/smp.h> -#include <linux/smp_lock.h> #include <linux/ptrace.h> -#include <linux/slab.h> -#include <linux/vmalloc.h> -#include <linux/user.h> -#include <linux/a.out.h> -#include <linux/interrupt.h> -#include <linux/unistd.h> -#include <linux/delay.h> #include <linux/reboot.h> #include <linux/init.h> - +#include <linux/module.h> #include <asm/uaccess.h> #include <asm/pgtable.h> -#include <asm/system.h> -#include <asm/io.h> -#include <asm/processor.h> /* includes also <asm/registers.h> */ -#include <asm/mmu_context.h> -#include <asm/elf.h> -#include <asm/page.h> - -#include <linux/irq.h> struct task_struct *last_task_used_math = NULL; -#ifdef IDLE_TRACE -#ifdef VM_SHOW_TABLES -/* For testing */ -static void print_PTE(long base) -{ - int i, skip=0; - long long x, y, *p = (long long *) base; - - for (i=0; i< 512; i++, p++){ - if (*p == 0) { - if (!skip) { - skip++; - printk("(0s) "); - } - } else { - skip=0; - x = (*p) >> 32; - y = (*p) & 0xffffffff; - printk("%08Lx%08Lx ", x, y); - if (!((i+1)&0x3)) printk("\n"); - } - } -} - -/* For testing */ -static void print_DIR(long base) -{ - int i, skip=0; - long *p = (long *) base; - - for (i=0; i< 512; i++, p++){ - if (*p == 0) { - if (!skip) { - skip++; - printk("(0s) "); - } - } else { - skip=0; - printk("%08lx ", *p); - if (!((i+1)&0x7)) printk("\n"); - } - } -} - -/* For testing */ -static void print_vmalloc_first_tables(void) -{ - -#define PRESENT 0x800 /* Bit 11 */ - - /* - * Do it really dirty by looking at raw addresses, - * raw offsets, no types. If we used pgtable/pgalloc - * macros/definitions we could hide potential bugs. - * - * Note that pointers are 32-bit for CDC. - */ - long pgdt, pmdt, ptet; - - pgdt = (long) &swapper_pg_dir; - printk("-->PGD (0x%08lx):\n", pgdt); - print_DIR(pgdt); - printk("\n"); - - /* VMALLOC pool is mapped at 0xc0000000, second (pointer) entry in PGD */ - pgdt += 4; - pmdt = (long) (* (long *) pgdt); - if (!(pmdt & PRESENT)) { - printk("No PMD\n"); - return; - } else pmdt &= 0xfffff000; - - printk("-->PMD (0x%08lx):\n", pmdt); - print_DIR(pmdt); - printk("\n"); - - /* Get the pmdt displacement for 0xc0000000 */ - pmdt += 2048; - - /* just look at first two address ranges ... */ - /* ... 0xc0000000 ... */ - ptet = (long) (* (long *) pmdt); - if (!(ptet & PRESENT)) { - printk("No PTE0\n"); - return; - } else ptet &= 0xfffff000; - - printk("-->PTE0 (0x%08lx):\n", ptet); - print_PTE(ptet); - printk("\n"); - - /* ... 0xc0001000 ... */ - ptet += 4; - if (!(ptet & PRESENT)) { - printk("No PTE1\n"); - return; - } else ptet &= 0xfffff000; - printk("-->PTE1 (0x%08lx):\n", ptet); - print_PTE(ptet); - printk("\n"); -} -#else -#define print_vmalloc_first_tables() -#endif /* VM_SHOW_TABLES */ - -static void test_VM(void) -{ - void *a, *b, *c; - -#ifdef VM_SHOW_TABLES - printk("Initial PGD/PMD/PTE\n"); -#endif - print_vmalloc_first_tables(); - - printk("Allocating 2 bytes\n"); - a = vmalloc(2); - print_vmalloc_first_tables(); - - printk("Allocating 4100 bytes\n"); - b = vmalloc(4100); - print_vmalloc_first_tables(); - - printk("Allocating 20234 bytes\n"); - c = vmalloc(20234); - print_vmalloc_first_tables(); - -#ifdef VM_TEST_FAULT - /* Here you may want to fault ! */ - -#ifdef VM_TEST_RTLBMISS - printk("Ready to fault upon read.\n"); - if (* (char *) a) { - printk("RTLBMISSed on area a !\n"); - } - printk("RTLBMISSed on area a !\n"); -#endif - -#ifdef VM_TEST_WTLBMISS - printk("Ready to fault upon write.\n"); - *((char *) b) = 'L'; - printk("WTLBMISSed on area b !\n"); -#endif - -#endif /* VM_TEST_FAULT */ - - printk("Deallocating the 4100 byte chunk\n"); - vfree(b); - print_vmalloc_first_tables(); - - printk("Deallocating the 2 byte chunk\n"); - vfree(a); - print_vmalloc_first_tables(); - - printk("Deallocating the last chunk\n"); - vfree(c); - print_vmalloc_first_tables(); -} - -extern unsigned long volatile jiffies; -int once = 0; -unsigned long old_jiffies; -int pid = -1, pgid = -1; - -void idle_trace(void) -{ - - _syscall0(int, getpid) - _syscall1(int, getpgid, int, pid) - - if (!once) { - /* VM allocation/deallocation simple test */ - test_VM(); - pid = getpid(); - - printk("Got all through to Idle !!\n"); - printk("I'm now going to loop forever ...\n"); - printk("Any ! below is a timer tick.\n"); - printk("Any . below is a getpgid system call from pid = %d.\n", pid); - - - old_jiffies = jiffies; - once++; - } - - if (old_jiffies != jiffies) { - old_jiffies = jiffies - old_jiffies; - switch (old_jiffies) { - case 1: - printk("!"); - break; - case 2: - printk("!!"); - break; - case 3: - printk("!!!"); - break; - case 4: - printk("!!!!"); - break; - default: - printk("(%d!)", (int) old_jiffies); - } - old_jiffies = jiffies; - } - pgid = getpgid(pid); - printk("."); -} -#else -#define idle_trace() do { } while (0) -#endif /* IDLE_TRACE */ - static int hlt_counter = 1; #define HARD_IDLE_TIMEOUT (HZ / 3) @@ -323,7 +78,6 @@ void cpu_idle(void) local_irq_disable(); while (!need_resched()) { local_irq_enable(); - idle_trace(); hlt(); local_irq_disable(); } @@ -622,6 +376,10 @@ void free_task_struct(struct task_struct *p) /* * Create a kernel thread */ +ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *)) +{ + do_exit(fn(arg)); +} /* * This is the mechanism for creating a new kernel thread. @@ -633,19 +391,17 @@ void free_task_struct(struct task_struct *p) */ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) { - /* A bit less processor dependent than older sh ... */ - unsigned int reply; + struct pt_regs regs; -static __inline__ _syscall2(int,clone,unsigned long,flags,unsigned long,newsp) -static __inline__ _syscall1(int,exit,int,ret) + memset(®s, 0, sizeof(regs)); + regs.regs[2] = (unsigned long)arg; + regs.regs[3] = (unsigned long)fn; - reply = clone(flags | CLONE_VM, 0); - if (!reply) { - /* Child */ - reply = exit(fn(arg)); - } + regs.pc = (unsigned long)kernel_thread_helper; + regs.sr = (1 << 30); - return reply; + return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, + ®s, 0, NULL, NULL); } /* |
