diff -urN kernels/2.4/v2.4.15-pre4/arch/i386/kernel/entry.S tr-2.4.15-pre4.diff/arch/i386/kernel/entry.S --- kernels/2.4/v2.4.15-pre4/arch/i386/kernel/entry.S Mon Nov 12 17:49:47 2001 +++ tr-2.4.15-pre4.diff/arch/i386/kernel/entry.S Mon Nov 12 23:42:09 2001 @@ -45,6 +45,7 @@ #include #include #include +#include EBX = 0x00 ECX = 0x04 @@ -128,10 +129,6 @@ .long 3b,6b; \ .previous -#define GET_CURRENT(reg) \ - movl $-8192, reg; \ - andl %esp, reg - ENTRY(lcall7) pushfl # We get a different stack layout with call gates, pushl %eax # which has to be cleaned up later.. @@ -144,7 +141,7 @@ movl %ecx,CS(%esp) # movl %esp,%ebx pushl %ebx - andl $-8192,%ebx # GET_CURRENT + GET_CURRENT(%ebx,%bx) movl exec_domain(%ebx),%edx # Get the execution domain movl 4(%edx),%edx # Get the lcall7 handler for the domain pushl $0x7 @@ -165,7 +162,7 @@ movl %ecx,CS(%esp) # movl %esp,%ebx pushl %ebx - andl $-8192,%ebx # GET_CURRENT + GET_CURRENT(%ebx,%bx) movl exec_domain(%ebx),%edx # Get the execution domain movl 4(%edx),%edx # Get the lcall7 handler for the domain pushl $0x27 @@ -179,7 +176,7 @@ pushl %ebx call SYMBOL_NAME(schedule_tail) addl $4, %esp - GET_CURRENT(%ebx) + GET_CURRENT(%ebx,%bx) testb $0x02,tsk_ptrace(%ebx) # PT_TRACESYS jne tracesys_exit jmp ret_from_sys_call @@ -194,7 +191,7 @@ ENTRY(system_call) pushl %eax # save orig_eax SAVE_ALL - GET_CURRENT(%ebx) + GET_CURRENT(%ebx,%bx) testb $0x02,tsk_ptrace(%ebx) # PT_TRACESYS jne tracesys cmpl $(NR_syscalls),%eax @@ -246,7 +243,7 @@ ALIGN ENTRY(ret_from_intr) - GET_CURRENT(%ebx) + GET_CURRENT(%ebx,%bx) ret_from_exception: movl EFLAGS(%esp),%eax # mix EFLAGS and CS movb CS(%esp),%al @@ -286,9 +283,9 @@ movl $(__KERNEL_DS),%edx movl %edx,%ds movl %edx,%es - GET_CURRENT(%ebx) call *%edi addl $8,%esp + GET_CURRENT(%ebx,%bx) jmp ret_from_exception ENTRY(coprocessor_error) @@ -304,7 +301,7 @@ ENTRY(device_not_available) pushl $-1 # mark this as an int SAVE_ALL - GET_CURRENT(%ebx) + GET_CURRENT(%ebx,%bx) movl %cr0,%eax testl $0x4,%eax # EM (math emulation bit) jne device_not_available_emulate diff -urN kernels/2.4/v2.4.15-pre4/arch/i386/kernel/head.S tr-2.4.15-pre4.diff/arch/i386/kernel/head.S --- kernels/2.4/v2.4.15-pre4/arch/i386/kernel/head.S Tue Jul 3 21:15:01 2001 +++ tr-2.4.15-pre4.diff/arch/i386/kernel/head.S Tue Nov 13 02:02:15 2001 @@ -261,13 +261,13 @@ #ifdef CONFIG_SMP movb ready, %cl cmpb $1,%cl - je 1f # the first CPU calls start_kernel + je 1f # the first CPU calls initialize_primary # all other CPUs call initialize_secondary call SYMBOL_NAME(initialize_secondary) jmp L6 1: #endif - call SYMBOL_NAME(start_kernel) + call SYMBOL_NAME(initialize_primary) L6: jmp L6 # main should never return here, but # just in case, we know what happens. @@ -320,7 +320,7 @@ ret ENTRY(stack_start) - .long SYMBOL_NAME(init_task_union)+8192 + .long SYMBOL_NAME(init_task_stack)+8192 .long __KERNEL_DS /* This is the default interrupt "handler" :-) */ diff -urN kernels/2.4/v2.4.15-pre4/arch/i386/kernel/init_task.c tr-2.4.15-pre4.diff/arch/i386/kernel/init_task.c --- kernels/2.4/v2.4.15-pre4/arch/i386/kernel/init_task.c Mon Sep 24 02:16:02 2001 +++ tr-2.4.15-pre4.diff/arch/i386/kernel/init_task.c Mon Nov 12 23:40:25 2001 @@ -13,14 +13,18 @@ /* * Initial task structure. - * + */ +union task_union init_task_union = + { INIT_TASK(init_task_union.task) }; +/* * We need to make sure that this is 8192-byte aligned due to the * way process stacks are handled. This is done by having a special * "init_task" linker map entry.. */ -union task_union init_task_union + +unsigned long init_task_stack[THREAD_SIZE/sizeof(unsigned long)] __attribute__((__section__(".data.init_task"))) = - { INIT_TASK(init_task_union.task) }; + { (unsigned long)&init_task_union,}; /* * per-CPU TSS segments. Threads are completely 'soft' on Linux, diff -urN kernels/2.4/v2.4.15-pre4/arch/i386/kernel/irq.c tr-2.4.15-pre4.diff/arch/i386/kernel/irq.c --- kernels/2.4/v2.4.15-pre4/arch/i386/kernel/irq.c Mon Nov 12 17:49:47 2001 +++ tr-2.4.15-pre4.diff/arch/i386/kernel/irq.c Mon Nov 12 23:40:25 2001 @@ -223,7 +223,6 @@ continue; } esp &= ~(THREAD_SIZE-1); - esp += sizeof(struct task_struct); show_stack((void*)esp); } printk("\nCPU %d:",cpu); diff -urN kernels/2.4/v2.4.15-pre4/arch/i386/kernel/ldt.c tr-2.4.15-pre4.diff/arch/i386/kernel/ldt.c --- kernels/2.4/v2.4.15-pre4/arch/i386/kernel/ldt.c Thu Nov 1 16:39:57 2001 +++ tr-2.4.15-pre4.diff/arch/i386/kernel/ldt.c Mon Nov 12 23:40:39 2001 @@ -12,11 +12,13 @@ #include #include #include +#include #include #include #include #include +#include /* * read_ldt() is not really atomic - this is not a problem since diff -urN kernels/2.4/v2.4.15-pre4/arch/i386/kernel/nmi.c tr-2.4.15-pre4.diff/arch/i386/kernel/nmi.c --- kernels/2.4/v2.4.15-pre4/arch/i386/kernel/nmi.c Mon Sep 24 02:16:02 2001 +++ tr-2.4.15-pre4.diff/arch/i386/kernel/nmi.c Tue Nov 13 02:07:56 2001 @@ -261,12 +261,10 @@ void nmi_watchdog_tick (struct pt_regs * regs) { - /* - * Since current-> is always on the stack, and we always switch - * the stack NMI-atomically, it's safe to use smp_processor_id(). + * NMI can interrupt page faults, use hard_get_current. */ - int sum, cpu = smp_processor_id(); + int sum, cpu = hard_smp_processor_id(); sum = apic_timer_irqs[cpu]; diff -urN kernels/2.4/v2.4.15-pre4/arch/i386/kernel/process.c tr-2.4.15-pre4.diff/arch/i386/kernel/process.c --- kernels/2.4/v2.4.15-pre4/arch/i386/kernel/process.c Fri Oct 12 03:11:49 2001 +++ tr-2.4.15-pre4.diff/arch/i386/kernel/process.c Tue Nov 13 02:12:21 2001 @@ -569,6 +569,63 @@ new_mm->context.cpuvalid = ~0UL; /* valid on all CPU's - they can't have stale data */ } +struct full_task_struct +{ + struct task_struct tsk; + struct task_struct_info info; +}; + +static kmem_cache_t * tsk_cache; + +struct task_struct * alloc_task_struct(void) +{ + struct full_task_struct *f = kmem_cache_alloc(tsk_cache, GFP_KERNEL); + if (!f) + return NULL; + f->info.kstack = (void*)__get_free_pages(GFP_KERNEL,1); + if (!f->info.kstack) { + kmem_cache_free(tsk_cache, f); + return NULL; + } + *(void**)f->info.kstack = &f->tsk; + atomic_set(&f->info.users, 1); + return &f->tsk; +} + +void get_task_struct(struct task_struct *tsk) +{ + struct full_task_struct *f = (struct full_task_struct*)tsk; + atomic_inc(&f->info.users); +} + +void free_task_struct(struct task_struct *tsk) +{ + struct full_task_struct *f = (struct full_task_struct*)tsk; + if(atomic_dec_and_test(&f->info.users)) { + free_pages((unsigned long) f->info.kstack, 1); + kmem_cache_free(tsk_cache, f); + } +} + +void __init init_tsk_allocator(void) +{ + tsk_cache = kmem_cache_create("task_cache", + sizeof(struct full_task_struct), + 0, + SLAB_HWCACHE_ALIGN, + NULL, NULL); + if (!tsk_cache) + panic("Cannot create task struct cache"); +} + +extern asmlinkage void start_kernel(void); +void __init initialize_primary(void) +{ + struct full_task_struct *f = (struct full_task_struct*)&init_task; + atomic_set(&f->info.users, 1); + f->info.kstack = init_task_stack; + start_kernel(); +} /* * Save a segment. */ @@ -580,8 +637,9 @@ struct task_struct * p, struct pt_regs * regs) { struct pt_regs * childregs; + struct full_task_struct *f = (struct full_task_struct *)p; - childregs = ((struct pt_regs *) (THREAD_SIZE + (unsigned long) p)) - 1; + childregs = ((struct pt_regs *) (THREAD_SIZE + (unsigned long) f->info.kstack)) - 1; struct_cpy(childregs, regs); childregs->eax = 0; childregs->esp = esp; diff -urN kernels/2.4/v2.4.15-pre4/arch/i386/kernel/setup.c tr-2.4.15-pre4.diff/arch/i386/kernel/setup.c --- kernels/2.4/v2.4.15-pre4/arch/i386/kernel/setup.c Mon Nov 12 17:51:05 2001 +++ tr-2.4.15-pre4.diff/arch/i386/kernel/setup.c Tue Nov 13 02:14:06 2001 @@ -109,6 +109,7 @@ #include #include #include +#include #include #include #include @@ -2806,6 +2807,7 @@ }; unsigned long cpu_initialized __initdata = 0; +extern int cpucount; /* * cpu_init() initializes state that is per-CPU. Some data is already @@ -2815,14 +2817,15 @@ */ void __init cpu_init (void) { - int nr = smp_processor_id(); + int nr = cpucount; + struct task_struct *cur = init_tasks[nr]; struct tss_struct * t = &init_tss[nr]; if (test_and_set_bit(nr, &cpu_initialized)) { printk(KERN_WARNING "CPU#%d already initialized!\n", nr); for (;;) __sti(); } - printk(KERN_INFO "Initializing CPU#%d\n", nr); + printk(KERN_INFO "Initializing CPU#%d/%d\n", nr, cpucount); if (cpu_has_vme || cpu_has_tsc || cpu_has_de) clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE); @@ -2847,17 +2850,21 @@ * set up and load the per-CPU TSS and LDT */ atomic_inc(&init_mm.mm_count); - current->active_mm = &init_mm; - if(current->mm) + cur->active_mm = &init_mm; + if(cur->mm) BUG(); - enter_lazy_tlb(&init_mm, current, nr); + enter_lazy_tlb(&init_mm, cur, nr); - t->esp0 = current->thread.esp0; + t->esp0 = cur->thread.esp0; set_tss_desc(nr,t); gdt_table[__TSS(nr)].b &= 0xfffffdff; load_TR(nr); load_LDT(&init_mm); + printk("cur: %p processor: %d smp_processor_id(): %d current: %p", + cur, cur->processor, smp_processor_id(), current); + smp_per_cpu_data()->curr = cur; + /* * Clear all 6 debug registers: */ @@ -2871,8 +2878,8 @@ /* * Force FPU initialization: */ - current->flags &= ~PF_USEDFPU; - current->used_math = 0; + cur->flags &= ~PF_USEDFPU; + cur->used_math = 0; stts(); } diff -urN kernels/2.4/v2.4.15-pre4/arch/i386/kernel/smpboot.c tr-2.4.15-pre4.diff/arch/i386/kernel/smpboot.c --- kernels/2.4/v2.4.15-pre4/arch/i386/kernel/smpboot.c Fri Oct 12 03:11:49 2001 +++ tr-2.4.15-pre4.diff/arch/i386/kernel/smpboot.c Tue Nov 13 01:28:27 2001 @@ -476,6 +476,12 @@ * from the task structure * This function must not return. */ +extern struct { + void * esp; + unsigned short ss; + unsigned long eip; +} stack_start; + void __init initialize_secondary(void) { /* @@ -487,14 +493,9 @@ "movl %0,%%esp\n\t" "jmp *%1" : - :"r" (current->thread.esp),"r" (current->thread.eip)); + :"r" (stack_start.esp),"r" (stack_start.eip)); } -extern struct { - void * esp; - unsigned short ss; -} stack_start; - static int __init fork_by_hand(void) { struct pt_regs regs; @@ -506,14 +507,14 @@ } /* which physical APIC ID maps to which logical CPU number */ -volatile int physical_apicid_2_cpu[MAX_APICID]; +volatile int physical_apicid_to_cpu[MAX_APICID]; /* which logical CPU number maps to which physical APIC ID */ -volatile int cpu_2_physical_apicid[NR_CPUS]; +volatile int cpu_to_physical_apicid[NR_CPUS]; /* which logical APIC ID maps to which logical CPU number */ -volatile int logical_apicid_2_cpu[MAX_APICID]; +volatile int logical_apicid_to_cpu[MAX_APICID]; /* which logical CPU number maps to which logical APIC ID */ -volatile int cpu_2_logical_apicid[NR_CPUS]; +volatile int cpu_to_logical_apicid[NR_CPUS]; static inline void init_cpu_to_apicid(void) /* Initialize all maps between cpu number and apicids */ @@ -521,12 +522,12 @@ int apicid, cpu; for (apicid = 0; apicid < MAX_APICID; apicid++) { - physical_apicid_2_cpu[apicid] = -1; - logical_apicid_2_cpu[apicid] = -1; + physical_apicid_to_cpu[apicid] = -1; + logical_apicid_to_cpu[apicid] = -1; } for (cpu = 0; cpu < NR_CPUS; cpu++) { - cpu_2_physical_apicid[cpu] = -1; - cpu_2_logical_apicid[cpu] = -1; + cpu_to_physical_apicid[cpu] = -1; + cpu_to_logical_apicid[cpu] = -1; } } @@ -537,11 +538,11 @@ */ { if (clustered_apic_mode) { - logical_apicid_2_cpu[apicid] = cpu; - cpu_2_logical_apicid[cpu] = apicid; + logical_apicid_to_cpu[apicid] = cpu; + cpu_to_logical_apicid[cpu] = apicid; } else { - physical_apicid_2_cpu[apicid] = cpu; - cpu_2_physical_apicid[cpu] = apicid; + physical_apicid_to_cpu[apicid] = cpu; + cpu_to_physical_apicid[cpu] = apicid; } } @@ -552,11 +553,11 @@ */ { if (clustered_apic_mode) { - logical_apicid_2_cpu[apicid] = -1; - cpu_2_logical_apicid[cpu] = -1; + logical_apicid_to_cpu[apicid] = -1; + cpu_to_logical_apicid[cpu] = -1; } else { - physical_apicid_2_cpu[apicid] = -1; - cpu_2_physical_apicid[cpu] = -1; + physical_apicid_to_cpu[apicid] = -1; + cpu_to_physical_apicid[cpu] = -1; } } @@ -804,7 +805,7 @@ map_cpu_to_boot_apicid(cpu, apicid); idle->has_cpu = 1; /* we schedule the first task manually */ - idle->thread.eip = (unsigned long) start_secondary; + stack_start.eip = idle->thread.eip = (unsigned long) start_secondary; del_from_runqueue(idle); unhash_process(idle); @@ -815,7 +816,7 @@ /* So we see what's up */ printk("Booting processor %d/%d eip %lx\n", cpu, apicid, start_eip); - stack_start.esp = (void *) (1024 + PAGE_SIZE + (char *)idle); + stack_start.esp = (void *) (THREAD_SIZE + (char *)TSK_TO_KSTACK(idle)); /* * This grunge runs the startup process for diff -urN kernels/2.4/v2.4.15-pre4/arch/i386/kernel/traps.c tr-2.4.15-pre4.diff/arch/i386/kernel/traps.c --- kernels/2.4/v2.4.15-pre4/arch/i386/kernel/traps.c Fri Oct 12 03:11:49 2001 +++ tr-2.4.15-pre4.diff/arch/i386/kernel/traps.c Tue Nov 13 02:13:26 2001 @@ -209,7 +209,7 @@ printk("ds: %04x es: %04x ss: %04x\n", regs->xds & 0xffff, regs->xes & 0xffff, ss); printk("Process %s (pid: %d, stackpage=%08lx)", - current->comm, current->pid, 4096+(unsigned long)current); + current->comm, current->pid, (long)TSK_TO_KSTACK(current)); /* * When in-kernel, we also print out the stack and code at the * time of the fault.. diff -urN kernels/2.4/v2.4.15-pre4/arch/i386/lib/getuser.S tr-2.4.15-pre4.diff/arch/i386/lib/getuser.S --- kernels/2.4/v2.4.15-pre4/arch/i386/lib/getuser.S Mon Jan 12 16:42:52 1998 +++ tr-2.4.15-pre4.diff/arch/i386/lib/getuser.S Mon Nov 12 23:40:39 2001 @@ -8,6 +8,7 @@ * return an error value in addition to the "real" * return value. */ +#include /* * __get_user_X @@ -27,8 +28,6 @@ .align 4 .globl __get_user_1 __get_user_1: - movl %esp,%edx - andl $0xffffe000,%edx cmpl addr_limit(%edx),%eax jae bad_get_user 1: movzbl (%eax),%edx @@ -39,9 +38,7 @@ .globl __get_user_2 __get_user_2: addl $1,%eax - movl %esp,%edx jc bad_get_user - andl $0xffffe000,%edx cmpl addr_limit(%edx),%eax jae bad_get_user 2: movzwl -1(%eax),%edx @@ -52,9 +49,7 @@ .globl __get_user_4 __get_user_4: addl $3,%eax - movl %esp,%edx jc bad_get_user - andl $0xffffe000,%edx cmpl addr_limit(%edx),%eax jae bad_get_user 3: movl -3(%eax),%edx diff -urN kernels/2.4/v2.4.15-pre4/arch/i386/mm/fault.c tr-2.4.15-pre4.diff/arch/i386/mm/fault.c --- kernels/2.4/v2.4.15-pre4/arch/i386/mm/fault.c Fri Oct 12 03:11:49 2001 +++ tr-2.4.15-pre4.diff/arch/i386/mm/fault.c Tue Nov 13 02:00:20 2001 @@ -24,6 +24,7 @@ #include #include #include +#include extern void die(const char *,struct pt_regs *,long); @@ -134,7 +135,6 @@ } asmlinkage void do_invalid_op(struct pt_regs *, unsigned long); -extern unsigned long idt; /* * This routine handles page faults. It determines the address, @@ -295,7 +295,7 @@ if (boot_cpu_data.f00f_bug) { unsigned long nr; - nr = (address - idt) >> 3; + nr = (address - (unsigned long)idt) >> 3; if (nr == 6) { do_invalid_op(regs, 0); diff -urN kernels/2.4/v2.4.15-pre4/include/asm-i386/current.h tr-2.4.15-pre4.diff/include/asm-i386/current.h --- kernels/2.4/v2.4.15-pre4/include/asm-i386/current.h Fri Aug 14 19:35:22 1998 +++ tr-2.4.15-pre4.diff/include/asm-i386/current.h Tue Nov 13 02:09:23 2001 @@ -1,15 +1,16 @@ #ifndef _I386_CURRENT_H #define _I386_CURRENT_H -struct task_struct; +#include +#include -static inline struct task_struct * get_current(void) +static inline struct task_struct *get_current(void) __attribute__((const)); +static inline struct task_struct *get_current(void) { - struct task_struct *current; - __asm__("andl %%esp,%0; ":"=r" (current) : "0" (~8191UL)); - return current; - } - + return smp_per_cpu_data()->curr; +} + +/* Note: the implementation is hardcoded into arch/i386/lib/getuser.S */ #define current get_current() #endif /* !(_I386_CURRENT_H) */ diff -urN kernels/2.4/v2.4.15-pre4/include/asm-i386/current_asm.h tr-2.4.15-pre4.diff/include/asm-i386/current_asm.h --- kernels/2.4/v2.4.15-pre4/include/asm-i386/current_asm.h Wed Dec 31 19:00:00 1969 +++ tr-2.4.15-pre4.diff/include/asm-i386/current_asm.h Mon Nov 12 23:49:25 2001 @@ -0,0 +1,30 @@ +/* asm/current_asm.h + */ +#ifndef __ASM__CURRENT_ASM_H +#define __ASM__CURRENT_ASM_H + +#include +#include +#include + +#if 1 /*def CONFIG_SMP*/ +/* Pass in the long and short versions of the register. + * eg GET_CURRENT(%ebx,%bx) + * All of this braindamage comes to us c/o a bug in gas: the + * opcode we want should actually be generated by strl, but + * unfortunately gas doesn't realize that the operand size + * prefix applies to str. Please take a wet noodle and thread + * it into my eye as that will be less painful than dealing + * with this mess. -ben + */ +#define GET_CURRENT(reg,regw) \ + str regw \ + ; shll $LOG2_PER_CPU_SIZE-5,reg \ + ; aligned_data_adjusted = aligned_data-(__FIRST_TSS_ENTRY << (LOG2_PER_CPU_SIZE - 2)) \ + ; movl aligned_data_adjusted(reg),reg + +#else +#define GET_CURRENT(reg,regw) movl (aligned_data),reg +#endif + +#endif /* __ASM__CURRENT_ASM_H */ diff -urN kernels/2.4/v2.4.15-pre4/include/asm-i386/desc.h tr-2.4.15-pre4.diff/include/asm-i386/desc.h --- kernels/2.4/v2.4.15-pre4/include/asm-i386/desc.h Mon Aug 13 15:12:08 2001 +++ tr-2.4.15-pre4.diff/include/asm-i386/desc.h Mon Nov 12 23:43:37 2001 @@ -34,7 +34,7 @@ * * Entry into gdt where to find first TSS. */ -#define __FIRST_TSS_ENTRY 12 +#define __FIRST_TSS_ENTRY 12 /* Note! Must be divisible by 4! See smp.h. */ #define __FIRST_LDT_ENTRY (__FIRST_TSS_ENTRY+1) #define __TSS(n) (((n)<<2) + __FIRST_TSS_ENTRY) @@ -60,40 +60,6 @@ #define __load_LDT(n) __asm__ __volatile__("lldt %%ax"::"a" (__LDT(n)<<3)) -/* - * This is the ldt that every process will get unless we need - * something other than this. - */ -extern struct desc_struct default_ldt[]; -extern void set_intr_gate(unsigned int irq, void * addr); -extern void set_ldt_desc(unsigned int n, void *addr, unsigned int size); -extern void set_tss_desc(unsigned int n, void *addr); - -static inline void clear_LDT(void) -{ - int cpu = smp_processor_id(); - set_ldt_desc(cpu, &default_ldt[0], 5); - __load_LDT(cpu); -} - -/* - * load one particular LDT into the current CPU - */ -static inline void load_LDT (struct mm_struct *mm) -{ - int cpu = smp_processor_id(); - void *segments = mm->context.segments; - int count = LDT_ENTRIES; - - if (!segments) { - segments = &default_ldt[0]; - count = 5; - } - - set_ldt_desc(cpu, segments, count); - __load_LDT(cpu); -} - #endif /* !__ASSEMBLY__ */ #endif diff -urN kernels/2.4/v2.4.15-pre4/include/asm-i386/descfn.h tr-2.4.15-pre4.diff/include/asm-i386/descfn.h --- kernels/2.4/v2.4.15-pre4/include/asm-i386/descfn.h Wed Dec 31 19:00:00 1969 +++ tr-2.4.15-pre4.diff/include/asm-i386/descfn.h Mon Nov 12 23:45:28 2001 @@ -0,0 +1,42 @@ +#ifndef __ARCH_DESCFN_H +#define __ARCH_DESCFN_H + +#ifndef __ARCH_DESC_H +#include +#endif + +/* + * This is the ldt that every process will get unless we need + * something other than this. + */ +extern struct desc_struct default_ldt[]; +extern void set_intr_gate(unsigned int irq, void * addr); +extern void set_ldt_desc(unsigned int n, void *addr, unsigned int size); +extern void set_tss_desc(unsigned int n, void *addr); + +static inline void clear_LDT(void) +{ + int cpu = smp_processor_id(); + set_ldt_desc(cpu, &default_ldt[0], 5); + __load_LDT(cpu); +} + +/* + * load one particular LDT into the current CPU + */ +static inline void load_LDT (struct mm_struct *mm) +{ + int cpu = smp_processor_id(); + void *segments = mm->context.segments; + int count = LDT_ENTRIES; + + if (!segments) { + segments = &default_ldt[0]; + count = 5; + } + + set_ldt_desc(cpu, segments, count); + __load_LDT(cpu); +} + +#endif /* __ARCH_DESCFN_H */ diff -urN kernels/2.4/v2.4.15-pre4/include/asm-i386/mmu_context.h tr-2.4.15-pre4.diff/include/asm-i386/mmu_context.h --- kernels/2.4/v2.4.15-pre4/include/asm-i386/mmu_context.h Mon Nov 12 20:10:02 2001 +++ tr-2.4.15-pre4.diff/include/asm-i386/mmu_context.h Tue Nov 13 00:26:42 2001 @@ -5,6 +5,7 @@ #include #include #include +#include /* * possibly do the LDT unload here? diff -urN kernels/2.4/v2.4.15-pre4/include/asm-i386/processor.h tr-2.4.15-pre4.diff/include/asm-i386/processor.h --- kernels/2.4/v2.4.15-pre4/include/asm-i386/processor.h Wed Oct 17 15:14:07 2001 +++ tr-2.4.15-pre4.diff/include/asm-i386/processor.h Tue Nov 13 00:19:34 2001 @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -76,7 +77,7 @@ extern struct cpuinfo_x86 cpu_data[]; #define current_cpu_data cpu_data[smp_processor_id()] #else -#define cpu_data &boot_cpu_data +#define cpu_data (&boot_cpu_data) #define current_cpu_data boot_cpu_data #endif @@ -383,6 +384,16 @@ unsigned long io_bitmap[IO_BITMAP_SIZE+1]; }; +struct task_struct_info +{ + void *kstack; + atomic_t users; +}; + +/* the init task stack is allocated externally */ +#define INIT_TASK_SIZE (sizeof(struct task_struct) + sizeof(struct task_struct_info)) +extern unsigned long init_task_stack[]; + #define INIT_THREAD { \ 0, \ 0, 0, 0, 0, \ @@ -395,7 +406,7 @@ #define INIT_TSS { \ 0,0, /* back_link, __blh */ \ - sizeof(init_stack) + (long) &init_stack, /* esp0 */ \ + 0, /* esp0 */ \ __KERNEL_DS, 0, /* ss0 */ \ 0,0,0,0,0,0, /* stack1, stack2 */ \ 0, /* cr3 */ \ @@ -444,16 +455,19 @@ } unsigned long get_wchan(struct task_struct *p); -#define KSTK_EIP(tsk) (((unsigned long *)(4096+(unsigned long)(tsk)))[1019]) -#define KSTK_ESP(tsk) (((unsigned long *)(4096+(unsigned long)(tsk)))[1022]) +#define TSK_TO_KSTACK(tsk) \ + ((unsigned long *) ((struct task_struct_info*)(tsk+1))->kstack) + +#define KSTK_EIP(tsk) (TSK_TO_KSTACK(tsk)[2043]) +#define KSTK_ESP(tsk) (TSK_TO_KSTACK(tsk)[2046]) #define THREAD_SIZE (2*PAGE_SIZE) -#define alloc_task_struct() ((struct task_struct *) __get_free_pages(GFP_KERNEL,1)) -#define free_task_struct(p) free_pages((unsigned long) (p), 1) -#define get_task_struct(tsk) atomic_inc(&virt_to_page(tsk)->count) +void init_tsk_allocator(void); +struct task_struct * alloc_task_struct(void); +void get_task_struct(struct task_struct *tsk); +void free_task_struct(struct task_struct *tsk); #define init_task (init_task_union.task) -#define init_stack (init_task_union.stack) struct microcode { unsigned int hdrver; diff -urN kernels/2.4/v2.4.15-pre4/include/asm-i386/smp.h tr-2.4.15-pre4.diff/include/asm-i386/smp.h --- kernels/2.4/v2.4.15-pre4/include/asm-i386/smp.h Mon Nov 12 20:07:58 2001 +++ tr-2.4.15-pre4.diff/include/asm-i386/smp.h Tue Nov 13 00:26:36 2001 @@ -8,6 +8,7 @@ #include #include #include +#include #endif #ifdef CONFIG_X86_LOCAL_APIC @@ -33,6 +34,7 @@ #else # define INT_DELIVERY_MODE 1 /* logical delivery */ # define TARGET_CPUS 0x01 +# define smp_per_cpu_data() per_data(0) #endif #ifndef clustered_apic_mode @@ -83,10 +85,10 @@ * the real APIC ID <-> CPU # mapping. */ #define MAX_APICID 256 -extern volatile int cpu_to_physical_apicid[NR_CPUS]; -extern volatile int physical_apicid_to_cpu[MAX_APICID]; -extern volatile int cpu_to_logical_apicid[NR_CPUS]; -extern volatile int logical_apicid_to_cpu[MAX_APICID]; +extern volatile int physical_apicid_to_cpu[]; +extern volatile int cpu_to_physical_apicid[]; +extern volatile int cpu_to_logical_apicid[]; +extern volatile int logical_apicid_to_cpu[]; /* * General functions that each host system must provide. @@ -100,8 +102,39 @@ * from the initial startup. We map APIC_BASE very early in page_setup(), * so this is correct in the x86 case. */ +extern int dummy_cpu_id; -#define smp_processor_id() (current->processor) +static inline unsigned get_TR(void) __attribute__ ((pure)); +static inline unsigned get_TR(void) +{ + unsigned tr; + /* The PAIN! The HORROR! + * Technically this is wrong, wrong, wrong, but + * gas doesn't know about strl. *sigh* Please + * flog them with a wet noodle repeatedly. + * The extra parameter is a dummy value to prevent + * gcc from assuming that the value is const across + * function calls. Fun! -ben + */ + __asm__ ("str %w0" : "=r" (tr) : "m" (dummy_cpu_id)); + return tr; +} + +#define smp_processor_id() ( (get_TR() >> 5) - (__FIRST_TSS_ENTRY >> 2) ) + +/* There is no way to tell gcc that the low bits of get_TR + * are always 0, hence the following macro to produce + * optimal code. -ben + */ +#define smp_per_cpu_data() \ + ( (struct per_cpu_data *) \ + ({ long idx; \ + __asm__("str %w0 ; shll %1,%0" \ + : "=r" (idx) \ + : "i" (LOG2_PER_CPU_SIZE - 5) \ + , "m" (dummy_cpu_id)); \ + (long)&aligned_data + idx - \ + (__FIRST_TSS_ENTRY << (LOG2_PER_CPU_SIZE - 2)); }) ) static __inline int hard_smp_processor_id(void) { diff -urN kernels/2.4/v2.4.15-pre4/include/asm-i386/smpboot.h tr-2.4.15-pre4.diff/include/asm-i386/smpboot.h --- kernels/2.4/v2.4.15-pre4/include/asm-i386/smpboot.h Fri Nov 9 23:55:07 2001 +++ tr-2.4.15-pre4.diff/include/asm-i386/smpboot.h Tue Nov 13 00:30:46 2001 @@ -36,21 +36,21 @@ * Mappings between logical cpu number and logical / physical apicid * The first four macros are trivial, but it keeps the abstraction consistent */ -extern volatile int logical_apicid_2_cpu[]; -extern volatile int cpu_2_logical_apicid[]; -extern volatile int physical_apicid_2_cpu[]; -extern volatile int cpu_2_physical_apicid[]; +extern volatile int logical_apicid_to_cpu[]; +extern volatile int cpu_to_logical_apicid[]; +extern volatile int physical_apicid_to_cpu[]; +extern volatile int cpu_to_physical_apicid[]; -#define logical_apicid_to_cpu(apicid) logical_apicid_2_cpu[apicid] -#define cpu_to_logical_apicid(cpu) cpu_2_logical_apicid[cpu] -#define physical_apicid_to_cpu(apicid) physical_apicid_2_cpu[apicid] -#define cpu_to_physical_apicid(cpu) cpu_2_physical_apicid[cpu] +#define logical_apicid_to_cpu(apicid) logical_apicid_to_cpu[apicid] +#define cpu_to_logical_apicid(cpu) cpu_to_logical_apicid[cpu] +#define physical_apicid_to_cpu(apicid) physical_apicid_to_cpu[apicid] +#define cpu_to_physical_apicid(cpu) cpu_to_physical_apicid[cpu] #ifdef CONFIG_MULTIQUAD /* use logical IDs to bootstrap */ -#define boot_apicid_to_cpu(apicid) logical_apicid_2_cpu[apicid] -#define cpu_to_boot_apicid(cpu) cpu_2_logical_apicid[cpu] +#define boot_apicid_to_cpu(apicid) logical_apicid_to_cpu[apicid] +#define cpu_to_boot_apicid(cpu) cpu_to_logical_apicid[cpu] #else /* !CONFIG_MULTIQUAD */ /* use physical IDs to bootstrap */ -#define boot_apicid_to_cpu(apicid) physical_apicid_2_cpu[apicid] -#define cpu_to_boot_apicid(cpu) cpu_2_physical_apicid[cpu] +#define boot_apicid_to_cpu(apicid) physical_apicid_to_cpu[apicid] +#define cpu_to_boot_apicid(cpu) cpu_to_physical_apicid[cpu] #endif /* CONFIG_MULTIQUAD */ diff -urN kernels/2.4/v2.4.15-pre4/include/asm-i386/uaccess.h tr-2.4.15-pre4.diff/include/asm-i386/uaccess.h --- kernels/2.4/v2.4.15-pre4/include/asm-i386/uaccess.h Mon Nov 12 20:14:41 2001 +++ tr-2.4.15-pre4.diff/include/asm-i386/uaccess.h Tue Nov 13 02:09:39 2001 @@ -109,7 +109,7 @@ #define __get_user_x(size,ret,x,ptr) \ __asm__ __volatile__("call __get_user_" #size \ :"=a" (ret),"=d" (x) \ - :"0" (ptr)) + :"0" (ptr), "1" (current)) /* Careful: we have to cast the result to the type of the pointer for sign reasons */ #define get_user(x,ptr) \ diff -urN kernels/2.4/v2.4.15-pre4/include/linux/per_cpu.h tr-2.4.15-pre4.diff/include/linux/per_cpu.h --- kernels/2.4/v2.4.15-pre4/include/linux/per_cpu.h Wed Dec 31 19:00:00 1969 +++ tr-2.4.15-pre4.diff/include/linux/per_cpu.h Mon Nov 12 23:40:39 2001 @@ -0,0 +1,32 @@ +#ifndef __LINUX__PER_CPU__H +#define __LINUX__PER_CPU__H + +#define LOG2_PER_CPU_SIZE 8 +#define PER_CPU_SIZE (1 << LOG2_PER_CPU_SIZE) + +#ifndef __ASSEMBLY__ +struct task_struct; + +struct per_cpu_data { + /* Assembly code relies on curr being the first member of this + * structure. Please change it if this gets rearranged. + */ + struct task_struct *curr; + cycles_t last_schedule; +}; + +union aligned_data { + struct per_cpu_data data; + char __pad [PER_CPU_SIZE]; + + /* Make sure the padding is large enough by forcing an error + * if it isn't. -ben + */ + char __pad2 [PER_CPU_SIZE - sizeof(struct per_cpu_data)]; +}; + +extern union aligned_data aligned_data[]; + +#define per_data(nr) (&aligned_data[nr].data) +#endif +#endif diff -urN kernels/2.4/v2.4.15-pre4/init/main.c tr-2.4.15-pre4.diff/init/main.c --- kernels/2.4/v2.4.15-pre4/init/main.c Mon Nov 12 17:51:08 2001 +++ tr-2.4.15-pre4.diff/init/main.c Mon Nov 12 23:40:39 2001 @@ -548,7 +548,6 @@ * Interrupts are still disabled. Do necessary setups, then * enable them */ - lock_kernel(); printk(linux_banner); setup_arch(&command_line); printk("Kernel command line: %s\n", saved_command_line); @@ -559,6 +558,13 @@ softirq_init(); time_init(); + /* At the very least, this has to come after trap_init as x86 + * needs to perform CPU setup before current is valid. This + * should be okay as we're still running with interrupts disabled + * and no other CPUs are up yet. -ben + */ + lock_kernel(); + /* * HACK ALERT! This is early. We're enabling the console before * we've done PCI setups etc, and console_init() must be aware of @@ -594,6 +600,9 @@ mempages = num_physpages; fork_init(mempages); +#ifdef __i386__ + init_tsk_allocator(); +#endif proc_caches_init(); vfs_caches_init(mempages); buffer_init(mempages); diff -urN kernels/2.4/v2.4.15-pre4/kernel/ksyms.c tr-2.4.15-pre4.diff/kernel/ksyms.c --- kernels/2.4/v2.4.15-pre4/kernel/ksyms.c Mon Nov 12 17:49:51 2001 +++ tr-2.4.15-pre4.diff/kernel/ksyms.c Mon Nov 12 23:40:39 2001 @@ -446,6 +446,7 @@ EXPORT_SYMBOL(kstat); EXPORT_SYMBOL(nr_running); +EXPORT_SYMBOL(aligned_data); /* misc */ EXPORT_SYMBOL(panic); diff -urN kernels/2.4/v2.4.15-pre4/kernel/sched.c tr-2.4.15-pre4.diff/kernel/sched.c --- kernels/2.4/v2.4.15-pre4/kernel/sched.c Mon Nov 12 17:51:08 2001 +++ tr-2.4.15-pre4.diff/kernel/sched.c Tue Nov 13 02:07:32 2001 @@ -28,6 +28,7 @@ #include #include #include +#include #include #include @@ -97,16 +98,10 @@ * We align per-CPU scheduling data on cacheline boundaries, * to prevent cacheline ping-pong. */ -static union { - struct schedule_data { - struct task_struct * curr; - cycles_t last_schedule; - } schedule_data; - char __pad [SMP_CACHE_BYTES]; -} aligned_data [NR_CPUS] __cacheline_aligned = { {{&init_task,0}}}; +union aligned_data aligned_data[NR_CPUS] __cacheline_aligned; -#define cpu_curr(cpu) aligned_data[(cpu)].schedule_data.curr -#define last_schedule(cpu) aligned_data[(cpu)].schedule_data.last_schedule +#define cpu_curr(cpu) per_data(cpu)->curr +#define last_schedule(cpu) per_data(cpu)->last_schedule struct kernel_stat kstat; extern struct task_struct *child_reaper; @@ -532,7 +527,7 @@ */ asmlinkage void schedule(void) { - struct schedule_data * sched_data; + struct per_cpu_data * sched_data; struct task_struct *prev, *next, *p; struct list_head *tmp; int this_cpu, c; @@ -543,7 +538,7 @@ if (!current->active_mm) BUG(); need_resched_back: prev = current; - this_cpu = prev->processor; + this_cpu = smp_processor_id(); /* This better than current->processor on up */ if (in_interrupt()) goto scheduling_in_interrupt; @@ -554,7 +549,7 @@ * 'sched_data' is protected by the fact that we can run * only one process per CPU. */ - sched_data = & aligned_data[this_cpu].schedule_data; + sched_data = per_data(this_cpu); spin_lock_irq(&runqueue_lock); @@ -1057,7 +1052,7 @@ // Subtract non-idle processes running on other CPUs. for (i = 0; i < smp_num_cpus; i++) { int cpu = cpu_logical_map(i); - if (aligned_data[cpu].schedule_data.curr != idle_task(cpu)) + if (per_data(cpu)->curr != idle_task(cpu)) nr_pending--; } #else @@ -1309,17 +1304,18 @@ void __init init_idle(void) { - struct schedule_data * sched_data; - sched_data = &aligned_data[smp_processor_id()].schedule_data; + struct per_cpu_data * sched_data; + int cpu = smp_processor_id(); + sched_data = per_data(cpu); if (current != &init_task && task_on_runqueue(current)) { printk("UGH! (%d:%d) was on the runqueue, removing.\n", - smp_processor_id(), current->pid); + cpu, current->pid); del_from_runqueue(current); } sched_data->curr = current; sched_data->last_schedule = get_cycles(); - clear_bit(current->processor, &wait_init_idle); + clear_bit(cpu, &wait_init_idle); } extern void init_timervecs (void);