diff options
| -rw-r--r-- | arch/ppc64/kernel/head.S | 7 | ||||
| -rw-r--r-- | arch/ppc64/kernel/setup.c | 2 | ||||
| -rw-r--r-- | arch/ppc64/kernel/smp.c | 15 | ||||
| -rw-r--r-- | arch/ppc64/mm/stab.c | 35 | ||||
| -rw-r--r-- | include/asm-ppc64/mmu.h | 2 |
5 files changed, 39 insertions, 22 deletions
diff --git a/arch/ppc64/kernel/head.S b/arch/ppc64/kernel/head.S index 93ebcac0d5a..3f447712e3f 100644 --- a/arch/ppc64/kernel/head.S +++ b/arch/ppc64/kernel/head.S @@ -2131,13 +2131,6 @@ empty_zero_page: swapper_pg_dir: .space 4096 -#ifdef CONFIG_SMP -/* 1 page segment table per cpu (max 48, cpu0 allocated at STAB0_PHYS_ADDR) */ - .globl stab_array -stab_array: - .space 4096 * 48 -#endif - /* * This space gets a copy of optional info passed to us by the bootstrap * Used to pass parameters into the kernel like root=/dev/sda1, etc. diff --git a/arch/ppc64/kernel/setup.c b/arch/ppc64/kernel/setup.c index e80f10c8982..687e8559520 100644 --- a/arch/ppc64/kernel/setup.c +++ b/arch/ppc64/kernel/setup.c @@ -1068,6 +1068,8 @@ void __init setup_arch(char **cmdline_p) irqstack_early_init(); emergency_stack_init(); + stabs_alloc(); + /* set up the bootmem stuff with available memory */ do_init_bootmem(); sparse_init(); diff --git a/arch/ppc64/kernel/smp.c b/arch/ppc64/kernel/smp.c index 2fcddfcb594..793b562da65 100644 --- a/arch/ppc64/kernel/smp.c +++ b/arch/ppc64/kernel/smp.c @@ -65,8 +65,6 @@ struct smp_ops_t *smp_ops; static volatile unsigned int cpu_callin_map[NR_CPUS]; -extern unsigned char stab_array[]; - void smp_call_function_interrupt(void); int smt_enabled_at_boot = 1; @@ -492,19 +490,6 @@ int __devinit __cpu_up(unsigned int cpu) paca[cpu].default_decr = tb_ticks_per_jiffy; - if (!cpu_has_feature(CPU_FTR_SLB)) { - void *tmp; - - /* maximum of 48 CPUs on machines with a segment table */ - if (cpu >= 48) - BUG(); - - tmp = &stab_array[PAGE_SIZE * cpu]; - memset(tmp, 0, PAGE_SIZE); - paca[cpu].stab_addr = (unsigned long)tmp; - paca[cpu].stab_real = virt_to_abs(tmp); - } - /* Make sure callin-map entry is 0 (can be leftover a CPU * hotplug */ diff --git a/arch/ppc64/mm/stab.c b/arch/ppc64/mm/stab.c index df4bbe14153..1b83f002bf2 100644 --- a/arch/ppc64/mm/stab.c +++ b/arch/ppc64/mm/stab.c @@ -18,6 +18,8 @@ #include <asm/mmu_context.h> #include <asm/paca.h> #include <asm/cputable.h> +#include <asm/lmb.h> +#include <asm/abs_addr.h> struct stab_entry { unsigned long esid_data; @@ -224,6 +226,39 @@ void switch_stab(struct task_struct *tsk, struct mm_struct *mm) extern void slb_initialize(void); /* + * Allocate segment tables for secondary CPUs. These must all go in + * the first (bolted) segment, so that do_stab_bolted won't get a + * recursive segment miss on the segment table itself. + */ +void stabs_alloc(void) +{ + int cpu; + + if (cpu_has_feature(CPU_FTR_SLB)) + return; + + for_each_cpu(cpu) { + unsigned long newstab; + + if (cpu == 0) + continue; /* stab for CPU 0 is statically allocated */ + + newstab = lmb_alloc_base(PAGE_SIZE, PAGE_SIZE, 1<<SID_SHIFT); + if (! newstab) + panic("Unable to allocate segment table for CPU %d.\n", + cpu); + + newstab += KERNELBASE; + + memset((void *)newstab, 0, PAGE_SIZE); + + paca[cpu].stab_addr = newstab; + paca[cpu].stab_real = virt_to_abs(newstab); + printk(KERN_DEBUG "Segment table for CPU %d at 0x%lx virtual, 0x%lx absolute\n", cpu, paca[cpu].stab_addr, paca[cpu].stab_real); + } +} + +/* * Build an entry for the base kernel segment and put it into * the segment table or SLB. All other segment table or SLB * entries are faulted in. diff --git a/include/asm-ppc64/mmu.h b/include/asm-ppc64/mmu.h index 3d07ddd11e3..88911803680 100644 --- a/include/asm-ppc64/mmu.h +++ b/include/asm-ppc64/mmu.h @@ -200,6 +200,8 @@ extern long native_hpte_insert(unsigned long hpte_group, unsigned long va, unsigned long prpn, unsigned long vflags, unsigned long rflags); +extern void stabs_alloc(void); + #endif /* __ASSEMBLY__ */ /* |