diff options
Diffstat (limited to 'arch/x86_64/mm/init.c')
| -rw-r--r-- | arch/x86_64/mm/init.c | 129 |
1 files changed, 79 insertions, 50 deletions
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c index e60a1a848de..286f6a624c3 100644 --- a/arch/x86_64/mm/init.c +++ b/arch/x86_64/mm/init.c @@ -22,6 +22,7 @@ #include <linux/pagemap.h> #include <linux/bootmem.h> #include <linux/proc_fs.h> +#include <linux/pci.h> #include <asm/processor.h> #include <asm/system.h> @@ -36,16 +37,13 @@ #include <asm/mmu_context.h> #include <asm/proto.h> #include <asm/smp.h> +#include <asm/sections.h> #ifndef Dprintk #define Dprintk(x...) #endif -#ifdef CONFIG_GART_IOMMU -extern int swiotlb; -#endif - -extern char _stext[]; +static unsigned long dma_reserve __initdata; DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); @@ -86,9 +84,6 @@ void show_mem(void) /* References to section boundaries */ -extern char _text, _etext, _edata, __bss_start, _end[]; -extern char __init_begin, __init_end; - int after_bootmem; static void *spp_getpage(void) @@ -308,42 +303,81 @@ void __init init_memory_mapping(unsigned long start, unsigned long end) table_end<<PAGE_SHIFT); } -extern struct x8664_pda cpu_pda[NR_CPUS]; +void __cpuinit zap_low_mappings(int cpu) +{ + if (cpu == 0) { + pgd_t *pgd = pgd_offset_k(0UL); + pgd_clear(pgd); + } else { + /* + * For AP's, zap the low identity mappings by changing the cr3 + * to init_level4_pgt and doing local flush tlb all + */ + asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt))); + } + __flush_tlb_all(); +} -/* Assumes all CPUs still execute in init_mm */ -void zap_low_mappings(void) +/* Compute zone sizes for the DMA and DMA32 zones in a node. */ +__init void +size_zones(unsigned long *z, unsigned long *h, + unsigned long start_pfn, unsigned long end_pfn) { - pgd_t *pgd = pgd_offset_k(0UL); - pgd_clear(pgd); - flush_tlb_all(); + int i; + unsigned long w; + + for (i = 0; i < MAX_NR_ZONES; i++) + z[i] = 0; + + if (start_pfn < MAX_DMA_PFN) + z[ZONE_DMA] = MAX_DMA_PFN - start_pfn; + if (start_pfn < MAX_DMA32_PFN) { + unsigned long dma32_pfn = MAX_DMA32_PFN; + if (dma32_pfn > end_pfn) + dma32_pfn = end_pfn; + z[ZONE_DMA32] = dma32_pfn - start_pfn; + } + z[ZONE_NORMAL] = end_pfn - start_pfn; + + /* Remove lower zones from higher ones. */ + w = 0; + for (i = 0; i < MAX_NR_ZONES; i++) { + if (z[i]) + z[i] -= w; + w += z[i]; + } + + /* Compute holes */ + w = 0; + for (i = 0; i < MAX_NR_ZONES; i++) { + unsigned long s = w; + w += z[i]; + h[i] = e820_hole_size(s, w); + } + + /* Add the space pace needed for mem_map to the holes too. */ + for (i = 0; i < MAX_NR_ZONES; i++) + h[i] += (z[i] * sizeof(struct page)) / PAGE_SIZE; + + /* The 16MB DMA zone has the kernel and other misc mappings. + Account them too */ + if (h[ZONE_DMA]) { + h[ZONE_DMA] += dma_reserve; + if (h[ZONE_DMA] >= z[ZONE_DMA]) { + printk(KERN_WARNING + "Kernel too large and filling up ZONE_DMA?\n"); + h[ZONE_DMA] = z[ZONE_DMA]; + } + } } #ifndef CONFIG_NUMA void __init paging_init(void) { - { - unsigned long zones_size[MAX_NR_ZONES]; - unsigned long holes[MAX_NR_ZONES]; - unsigned int max_dma; - - memset(zones_size, 0, sizeof(zones_size)); - memset(holes, 0, sizeof(holes)); - - max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; - - if (end_pfn < max_dma) { - zones_size[ZONE_DMA] = end_pfn; - holes[ZONE_DMA] = e820_hole_size(0, end_pfn); - } else { - zones_size[ZONE_DMA] = max_dma; - holes[ZONE_DMA] = e820_hole_size(0, max_dma); - zones_size[ZONE_NORMAL] = end_pfn - max_dma; - holes[ZONE_NORMAL] = e820_hole_size(max_dma, end_pfn); - } - free_area_init_node(0, NODE_DATA(0), zones_size, - __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes); - } - return; + unsigned long zones[MAX_NR_ZONES], holes[MAX_NR_ZONES]; + size_zones(zones, holes, 0, end_pfn); + free_area_init_node(0, NODE_DATA(0), zones, + __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes); } #endif @@ -438,19 +472,16 @@ void __init mem_init(void) datasize >> 10, initsize >> 10); +#ifdef CONFIG_SMP /* - * Subtle. SMP is doing its boot stuff late (because it has to - * fork idle threads) - but it also needs low mappings for the - * protected-mode entry to work. We zap these entries only after - * the WP-bit has been tested. + * Sync boot_level4_pgt mappings with the init_level4_pgt + * except for the low identity mappings which are already zapped + * in init_level4_pgt. This sync-up is essential for AP's bringup */ -#ifndef CONFIG_SMP - zap_low_mappings(); + memcpy(boot_level4_pgt+1, init_level4_pgt+1, (PTRS_PER_PGD-1)*sizeof(pgd_t)); #endif } -extern char __initdata_begin[], __initdata_end[]; - void free_initmem(void) { unsigned long addr; @@ -464,7 +495,7 @@ void free_initmem(void) totalram_pages++; } memset(__initdata_begin, 0xba, __initdata_end - __initdata_begin); - printk ("Freeing unused kernel memory: %luk freed\n", (&__init_end - &__init_begin) >> 10); + printk ("Freeing unused kernel memory: %luk freed\n", (__init_end - __init_begin) >> 10); } #ifdef CONFIG_BLK_DEV_INITRD @@ -491,6 +522,8 @@ void __init reserve_bootmem_generic(unsigned long phys, unsigned len) #else reserve_bootmem(phys, len); #endif + if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) + dma_reserve += len / PAGE_SIZE; } int kern_addr_valid(unsigned long addr) @@ -532,10 +565,6 @@ extern int exception_trace, page_fault_trace; static ctl_table debug_table2[] = { { 99, "exception-trace", &exception_trace, sizeof(int), 0644, NULL, proc_dointvec }, -#ifdef CONFIG_CHECKING - { 100, "page-fault-trace", &page_fault_trace, sizeof(int), 0644, NULL, - proc_dointvec }, -#endif { 0, } }; |