diff options
Diffstat (limited to 'arch/s390/kernel/vdso.c')
| -rw-r--r-- | arch/s390/kernel/vdso.c | 124 |
1 files changed, 121 insertions, 3 deletions
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c index 10a6ccef441..690e1781968 100644 --- a/arch/s390/kernel/vdso.c +++ b/arch/s390/kernel/vdso.c @@ -31,9 +31,6 @@ #include <asm/sections.h> #include <asm/vdso.h> -/* Max supported size for symbol names */ -#define MAX_SYMNAME 64 - #if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT) extern char vdso32_start, vdso32_end; static void *vdso32_kbase = &vdso32_start; @@ -71,6 +68,119 @@ static union { struct vdso_data *vdso_data = &vdso_data_store.data; /* + * Setup vdso data page. + */ +static void vdso_init_data(struct vdso_data *vd) +{ + unsigned int facility_list; + + facility_list = stfl(); + vd->ectg_available = switch_amode && (facility_list & 1); +} + +#ifdef CONFIG_64BIT +/* + * Setup per cpu vdso data page. + */ +static void vdso_init_per_cpu_data(int cpu, struct vdso_per_cpu_data *vpcd) +{ +} + +/* + * Allocate/free per cpu vdso data. + */ +#ifdef CONFIG_64BIT +#define SEGMENT_ORDER 2 +#else +#define SEGMENT_ORDER 1 +#endif + +int vdso_alloc_per_cpu(int cpu, struct _lowcore *lowcore) +{ + unsigned long segment_table, page_table, page_frame; + u32 *psal, *aste; + int i; + + lowcore->vdso_per_cpu_data = __LC_PASTE; + + if (!switch_amode || !vdso_enabled) + return 0; + + segment_table = __get_free_pages(GFP_KERNEL, SEGMENT_ORDER); + page_table = get_zeroed_page(GFP_KERNEL | GFP_DMA); + page_frame = get_zeroed_page(GFP_KERNEL); + if (!segment_table || !page_table || !page_frame) + goto out; + + clear_table((unsigned long *) segment_table, _SEGMENT_ENTRY_EMPTY, + PAGE_SIZE << SEGMENT_ORDER); + clear_table((unsigned long *) page_table, _PAGE_TYPE_EMPTY, + 256*sizeof(unsigned long)); + + *(unsigned long *) segment_table = _SEGMENT_ENTRY + page_table; + *(unsigned long *) page_table = _PAGE_RO + page_frame; + + psal = (u32 *) (page_table + 256*sizeof(unsigned long)); + aste = psal + 32; + + for (i = 4; i < 32; i += 4) + psal[i] = 0x80000000; + + lowcore->paste[4] = (u32)(addr_t) psal; + psal[0] = 0x20000000; + psal[2] = (u32)(addr_t) aste; + *(unsigned long *) (aste + 2) = segment_table + + _ASCE_TABLE_LENGTH + _ASCE_USER_BITS + _ASCE_TYPE_SEGMENT; + aste[4] = (u32)(addr_t) psal; + lowcore->vdso_per_cpu_data = page_frame; + + vdso_init_per_cpu_data(cpu, (struct vdso_per_cpu_data *) page_frame); + return 0; + +out: + free_page(page_frame); + free_page(page_table); + free_pages(segment_table, SEGMENT_ORDER); + return -ENOMEM; +} + +#ifdef CONFIG_HOTPLUG_CPU +void vdso_free_per_cpu(int cpu, struct _lowcore *lowcore) +{ + unsigned long segment_table, page_table, page_frame; + u32 *psal, *aste; + + if (!switch_amode || !vdso_enabled) + return; + + psal = (u32 *)(addr_t) lowcore->paste[4]; + aste = (u32 *)(addr_t) psal[2]; + segment_table = *(unsigned long *)(aste + 2) & PAGE_MASK; + page_table = *(unsigned long *) segment_table; + page_frame = *(unsigned long *) page_table; + + free_page(page_frame); + free_page(page_table); + free_pages(segment_table, SEGMENT_ORDER); +} +#endif /* CONFIG_HOTPLUG_CPU */ + +static void __vdso_init_cr5(void *dummy) +{ + unsigned long cr5; + + cr5 = offsetof(struct _lowcore, paste); + __ctl_load(cr5, 5, 5); +} + +static void vdso_init_cr5(void) +{ + if (switch_amode && vdso_enabled) + on_each_cpu(__vdso_init_cr5, NULL, 1); +} +#endif /* CONFIG_64BIT */ + +/* * This is called from binfmt_elf, we create the special vma for the * vDSO and insert it into the mm struct tree */ @@ -172,6 +282,9 @@ static int __init vdso_init(void) { int i; + if (!vdso_enabled) + return 0; + vdso_init_data(vdso_data); #if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT) /* Calculate the size of the 32 bit vDSO */ vdso32_pages = ((&vdso32_end - &vdso32_start @@ -208,6 +321,11 @@ static int __init vdso_init(void) } vdso64_pagelist[vdso64_pages - 1] = virt_to_page(vdso_data); vdso64_pagelist[vdso64_pages] = NULL; +#ifndef CONFIG_SMP + if (vdso_alloc_per_cpu(0, &S390_lowcore)) + BUG(); +#endif + vdso_init_cr5(); #endif /* CONFIG_64BIT */ get_page(virt_to_page(vdso_data)); |