diff options
Diffstat (limited to 'arch/parisc/mm/init.c')
| -rw-r--r-- | arch/parisc/mm/init.c | 1019 |
1 files changed, 1019 insertions, 0 deletions
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c new file mode 100644 index 000000000000..cac37589e35c --- /dev/null +++ b/arch/parisc/mm/init.c @@ -0,0 +1,1019 @@ +/* + * linux/arch/parisc/mm/init.c + * + * Copyright (C) 1995 Linus Torvalds + * Copyright 1999 SuSE GmbH + * changed by Philipp Rumpf + * Copyright 1999 Philipp Rumpf (prumpf@tux.org) + * Copyright 2004 Randolph Chung (tausq@debian.org) + * + */ + +#include <linux/config.h> + +#include <linux/module.h> +#include <linux/mm.h> +#include <linux/bootmem.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/pci.h> /* for hppa_dma_ops and pcxl_dma_ops */ +#include <linux/initrd.h> +#include <linux/swap.h> +#include <linux/unistd.h> +#include <linux/nodemask.h> /* for node_online_map */ +#include <linux/pagemap.h> /* for release_pages and page_cache_release */ + +#include <asm/pgalloc.h> +#include <asm/tlb.h> +#include <asm/pdc_chassis.h> +#include <asm/mmzone.h> + +DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); + +extern char _text; /* start of kernel code, defined by linker */ +extern int data_start; +extern char _end; /* end of BSS, defined by linker */ +extern char __init_begin, __init_end; + +#ifdef CONFIG_DISCONTIGMEM +struct node_map_data node_data[MAX_NUMNODES]; +bootmem_data_t bmem_data[MAX_NUMNODES]; +unsigned char pfnnid_map[PFNNID_MAP_MAX]; +#endif + +static struct resource data_resource = { + .name = "Kernel data", + .flags = IORESOURCE_BUSY | IORESOURCE_MEM, +}; + +static struct resource code_resource = { + .name = "Kernel code", + .flags = IORESOURCE_BUSY | IORESOURCE_MEM, +}; + +static struct resource pdcdata_resource = { + .name = "PDC data (Page Zero)", + .start = 0, + .end = 0x9ff, + .flags = IORESOURCE_BUSY | IORESOURCE_MEM, +}; + +static struct resource sysram_resources[MAX_PHYSMEM_RANGES]; + +/* The following array is initialized from the firmware specific + * information retrieved in kernel/inventory.c. + */ + +physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES]; +int npmem_ranges; + +#ifdef __LP64__ +#define MAX_MEM (~0UL) +#else /* !__LP64__ */ +#define MAX_MEM (3584U*1024U*1024U) +#endif /* !__LP64__ */ + +static unsigned long mem_limit = MAX_MEM; + +static void __init mem_limit_func(void) +{ + char *cp, *end; + unsigned long limit; + extern char saved_command_line[]; + + /* We need this before __setup() functions are called */ + + limit = MAX_MEM; + for (cp = saved_command_line; *cp; ) { + if (memcmp(cp, "mem=", 4) == 0) { + cp += 4; + limit = memparse(cp, &end); + if (end != cp) + break; + cp = end; + } else { + while (*cp != ' ' && *cp) + ++cp; + while (*cp == ' ') + ++cp; + } + } + + if (limit < mem_limit) + mem_limit = limit; +} + +#define MAX_GAP (0x40000000UL >> PAGE_SHIFT) + +static void __init setup_bootmem(void) +{ + unsigned long bootmap_size; + unsigned long mem_max; + unsigned long bootmap_pages; + unsigned long bootmap_start_pfn; + unsigned long bootmap_pfn; +#ifndef CONFIG_DISCONTIGMEM + physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1]; + int npmem_holes; +#endif + int i, sysram_resource_count; + + disable_sr_hashing(); /* Turn off space register hashing */ + + /* + * Sort the ranges. Since the number of ranges is typically + * small, and performance is not an issue here, just do + * a simple insertion sort. + */ + + for (i = 1; i < npmem_ranges; i++) { + int j; + + for (j = i; j > 0; j--) { + unsigned long tmp; + + if (pmem_ranges[j-1].start_pfn < + pmem_ranges[j].start_pfn) { + + break; + } + tmp = pmem_ranges[j-1].start_pfn; + pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn; + pmem_ranges[j].start_pfn = tmp; + tmp = pmem_ranges[j-1].pages; + pmem_ranges[j-1].pages = pmem_ranges[j].pages; + pmem_ranges[j].pages = tmp; + } + } + +#ifndef CONFIG_DISCONTIGMEM + /* + * Throw out ranges that are too far apart (controlled by + * MAX_GAP). + */ + + for (i = 1; i < npmem_ranges; i++) { + if (pmem_ranges[i].start_pfn - + (pmem_ranges[i-1].start_pfn + + pmem_ranges[i-1].pages) > MAX_GAP) { + npmem_ranges = i; + printk("Large gap in memory detected (%ld pages). " + "Consider turning on CONFIG_DISCONTIGMEM\n", + pmem_ranges[i].start_pfn - + (pmem_ranges[i-1].start_pfn + + pmem_ranges[i-1].pages)); + break; + } + } +#endif + + if (npmem_ranges > 1) { + + /* Print the memory ranges */ + + printk(KERN_INFO "Memory Ranges:\n"); + + for (i = 0; i < npmem_ranges; i++) { + unsigned long start; + unsigned long size; + + size = (pmem_ranges[i].pages << PAGE_SHIFT); + start = (pmem_ranges[i].start_pfn << PAGE_SHIFT); + printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n", + i,start, start + (size - 1), size >> 20); + } + } + + sysram_resource_count = npmem_ranges; + for (i = 0; i < sysram_resource_count; i++) { + struct resource *res = &sysram_resources[i]; + res->name = "System RAM"; + res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT; + res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1; + res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; + request_resource(&iomem_resource, res); + } + + /* + * For 32 bit kernels we limit the amount of memory we can + * support, in order to preserve enough kernel address space + * for other purposes. For 64 bit kernels we don't normally + * limit the memory, but this mechanism can be used to + * artificially limit the amount of memory (and it is written + * to work with multiple memory ranges). + */ + + mem_limit_func(); /* check for "mem=" argument */ + + mem_max = 0; + num_physpages = 0; + for (i = 0; i < npmem_ranges; i++) { + unsigned long rsize; + + rsize = pmem_ranges[i].pages << PAGE_SHIFT; + if ((mem_max + rsize) > mem_limit) { + printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20); + if (mem_max == mem_limit) + npmem_ranges = i; + else { + pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT) + - (mem_max >> PAGE_SHIFT); + npmem_ranges = i + 1; + mem_max = mem_limit; + } + num_physpages += pmem_ranges[i].pages; + break; + } + num_physpages += pmem_ranges[i].pages; + mem_max += rsize; + } + + printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20); + +#ifndef CONFIG_DISCONTIGMEM + /* Merge the ranges, keeping track of the holes */ + + { + unsigned long end_pfn; + unsigned long hole_pages; + + npmem_holes = 0; + end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages; + for (i = 1; i < npmem_ranges; i++) { + + hole_pages = pmem_ranges[i].start_pfn - end_pfn; + if (hole_pages) { + pmem_holes[npmem_holes].start_pfn = end_pfn; + pmem_holes[npmem_holes++].pages = hole_pages; + end_pfn += hole_pages; + } + end_pfn += pmem_ranges[i].pages; + } + + pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn; + npmem_ranges = 1; + } +#endif + + bootmap_pages = 0; + for (i = 0; i < npmem_ranges; i++) + bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages); + + bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT; + +#ifdef CONFIG_DISCONTIGMEM + for (i = 0; i < MAX_PHYSMEM_RANGES; i++) { + memset(NODE_DATA(i), 0, sizeof(pg_data_t)); + NODE_DATA(i)->bdata = &bmem_data[i]; + } + memset(pfnnid_map, 0xff, sizeof(pfnnid_map)); + + for (i = 0; i < npmem_ranges; i++) + node_set_online(i); +#endif + + /* + * Initialize and free the full range of memory in each range. + * Note that the only writing these routines do are to the bootmap, + * and we've made sure to locate the bootmap properly so that they + * won't be writing over anything important. + */ + + bootmap_pfn = bootmap_start_pfn; + max_pfn = 0; + for (i = 0; i < npmem_ranges; i++) { + unsigned long start_pfn; + unsigned long npages; + + start_pfn = pmem_ranges[i].start_pfn; + npages = pmem_ranges[i].pages; + + bootmap_size = init_bootmem_node(NODE_DATA(i), + bootmap_pfn, + start_pfn, + (start_pfn + npages) ); + free_bootmem_node(NODE_DATA(i), + (start_pfn << PAGE_SHIFT), + (npages << PAGE_SHIFT) ); + bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT; + if ((start_pfn + npages) > max_pfn) + max_pfn = start_pfn + npages; + } + + if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) { + printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n"); + BUG(); + } + + /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */ + +#define PDC_CONSOLE_IO_IODC_SIZE 32768 + + reserve_bootmem_node(NODE_DATA(0), 0UL, + (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE)); + reserve_bootmem_node(NODE_DATA(0),__pa((unsigned long)&_text), + (unsigned long)(&_end - &_text)); + reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT), + ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT)); + +#ifndef CONFIG_DISCONTIGMEM + + /* reserve the holes */ + + for (i = 0; i < npmem_holes; i++) { + reserve_bootmem_node(NODE_DATA(0), + (pmem_holes[i].start_pfn << PAGE_SHIFT), + (pmem_holes[i].pages << PAGE_SHIFT)); + } +#endif + +#ifdef CONFIG_BLK_DEV_INITRD + if (initrd_start) { + printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end); + if (__pa(initrd_start) < mem_max) { + unsigned long initrd_reserve; + + if (__pa(initrd_end) > mem_max) { + initrd_reserve = mem_max - __pa(initrd_start); + } else { + initrd_reserve = initrd_end - initrd_start; + } + initrd_below_start_ok = 1; + printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max); + + reserve_bootmem_node(NODE_DATA(0),__pa(initrd_start), initrd_reserve); + } + } +#endif + + data_resource.start = virt_to_phys(&data_start); + data_resource.end = virt_to_phys(&_end)-1; + code_resource.start = virt_to_phys(&_text); + code_resource.end = virt_to_phys(&data_start)-1; + + /* We don't know which region the kernel will be in, so try + * all of them. + */ + for (i = 0; i < sysram_resource_count; i++) { + struct resource *res = &sysram_resources[i]; + request_resource(res, &code_resource); + request_resource(res, &data_resource); + } + request_resource(&sysram_resources[0], &pdcdata_resource); +} + +void free_initmem(void) +{ + /* FIXME: */ +#if 0 + printk(KERN_INFO "NOT FREEING INITMEM (%dk)\n", + (&__init_end - &__init_begin) >> 10); + return; +#else + unsigned long addr; + + printk(KERN_INFO "Freeing unused kernel memory: "); + +#if 1 + /* Attempt to catch anyone trying to execute code here + * by filling the page with BRK insns. + * + * If we disable interrupts for all CPUs, then IPI stops working. + * Kinda breaks the global cache flushing. + */ + local_irq_disable(); + + memset(&__init_begin, 0x00, + (unsigned long)&__init_end - (unsigned long)&__init_begin); + + flush_data_cache(); + asm volatile("sync" : : ); + flush_icache_range((unsigned long)&__init_begin, (unsigned long)&__init_end); + asm volatile("sync" : : ); + + local_irq_enable(); +#endif + + addr = (unsigned long)(&__init_begin); + for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { + ClearPageReserved(virt_to_page(addr)); + set_page_count(virt_to_page(addr), 1); + free_page(addr); + num_physpages++; + totalram_pages++; + } + + /* set up a new led state on systems shipped LED State panel */ + pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE); + + printk("%luk freed\n", (unsigned long)(&__init_end - &__init_begin) >> 10); +#endif +} + +/* + * Just an arbitrary offset to serve as a "hole" between mapping areas + * (between top of physical memory and a potential pcxl dma mapping + * area, and below the vmalloc mapping area). + * + * The current 32K value just means that there will be a 32K "hole" + * between mapping areas. That means that any out-of-bounds memory + * accesses will hopefully be caught. The vmalloc() routines leaves + * a hole of 4kB between each vmalloced area for the same reason. + */ + + /* Leave room for gateway page expansion */ +#if KERNEL_MAP_START < GATEWAY_PAGE_SIZE +#error KERNEL_MAP_START is in gateway reserved region +#endif +#define MAP_START (KERNEL_MAP_START) + +#define VM_MAP_OFFSET (32*1024) +#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \ + & ~(VM_MAP_OFFSET-1))) + +void *vmalloc_start; +EXPORT_SYMBOL(vmalloc_start); + +#ifdef CONFIG_PA11 +unsigned long pcxl_dma_start; +#endif + +void __init mem_init(void) +{ + high_memory = __va((max_pfn << PAGE_SHIFT)); + +#ifndef CONFIG_DISCONTIGMEM + max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1; + totalram_pages += free_all_bootmem(); +#else + { + int i; + + for (i = 0; i < npmem_ranges; i++) + totalram_pages += free_all_bootmem_node(NODE_DATA(i)); + } +#endif + + printk(KERN_INFO "Memory: %luk available\n", num_physpages << (PAGE_SHIFT-10)); + +#ifdef CONFIG_PA11 + if (hppa_dma_ops == &pcxl_dma_ops) { + pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START); + vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE); + } else { + pcxl_dma_start = 0; + vmalloc_start = SET_MAP_OFFSET(MAP_START); + } +#else + vmalloc_start = SET_MAP_OFFSET(MAP_START); +#endif + +} + +int do_check_pgt_cache(int low, int high) +{ + return 0; +} + +unsigned long *empty_zero_page; + +void show_mem(void) +{ + int i,free = 0,total = 0,reserved = 0; + int shared = 0, cached = 0; + + printk(KERN_INFO "Mem-info:\n"); + show_free_areas(); + printk(KERN_INFO "Free swap: %6ldkB\n", + nr_swap_pages<<(PAGE_SHIFT-10)); +#ifndef CONFIG_DISCONTIGMEM + i = max_mapnr; + while (i-- > 0) { + total++; + if (PageReserved(mem_map+i)) + reserved++; + else if (PageSwapCache(mem_map+i)) + cached++; + else if (!page_count(&mem_map[i])) + free++; + else + shared += page_count(&mem_map[i]) - 1; + } +#else + for (i = 0; i < npmem_ranges; i++) { + int j; + + for (j = node_start_pfn(i); j < node_end_pfn(i); j++) { + struct page *p; + + p = node_mem_map(i) + j - node_start_pfn(i); + + total++; + if (PageReserved(p)) + reserved++; + else if (PageSwapCache(p)) + cached++; + else if (!page_count(p)) + free++; + else + shared += page_count(p) - 1; + } + } +#endif + printk(KERN_INFO "%d pages of RAM\n", total); + printk(KERN_INFO "%d reserved pages\n", reserved); + printk(KERN_INFO "%d pages shared\n", shared); + printk(KERN_INFO "%d pages swap cached\n", cached); + + +#ifdef CONFIG_DISCONTIGMEM + { + struct zonelist *zl; + int i, j, k; + + for (i = 0; i < npmem_ranges; i++) { + for (j = 0; j < MAX_NR_ZONES; j++) { + zl = NODE_DATA(i)->node_zonelists + j; + + printk("Zone list for zone %d on node %d: ", j, i); + for (k = 0; zl->zones[k] != NULL; k++) + printk("[%d/%s] ", zl->zones[k]->zone_pgdat->node_id, zl->zones[k]->name); + printk("\n"); + } + } + } +#endif +} + + +static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot) +{ + pgd_t *pg_dir; + pmd_t *pmd; + pte_t *pg_table; + unsigned long end_paddr; + unsigned long start_pmd; + unsigned long start_pte; + unsigned long tmp1; + unsigned long tmp2; + unsigned long address; + unsigned long ro_start; + unsigned long ro_end; + unsigned long fv_addr; + unsigned long gw_addr; + extern const unsigned long fault_vector_20; + extern void * const linux_gateway_page; + + ro_start = __pa((unsigned long)&_text); + ro_end = __pa((unsigned long)&data_start); + fv_addr = __pa((unsigned long)&fault_vector_20) & PAGE_MASK; + gw_addr = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK; + + end_paddr = start_paddr + size; + + pg_dir = pgd_offset_k(start_vaddr); + +#if PTRS_PER_PMD == 1 + start_pmd = 0; +#else + start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); +#endif + start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); + + address = start_paddr; + while (address < end_paddr) { +#if PTRS_PER_PMD == 1 + pmd = (pmd_t *)__pa(pg_dir); +#else + pmd = (pmd_t *)pgd_address(*pg_dir); + + /* + * pmd is physical at this point + */ + + if (!pmd) { + pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER); + pmd = (pmd_t *) __pa(pmd); + } + + pgd_populate(NULL, pg_dir, __va(pmd)); +#endif + pg_dir++; + + /* now change pmd to kernel virtual addresses */ + + pmd = (pmd_t *)__va(pmd) + start_pmd; + for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) { + + /* + * pg_table is physical at this point + */ + + pg_table = (pte_t *)pmd_address(*pmd); + if (!pg_table) { + pg_table = (pte_t *) + alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE); + pg_table = (pte_t *) __pa(pg_table); + } + + pmd_populate_kernel(NULL, pmd, __va(pg_table)); + + /* now change pg_table to kernel virtual addresses */ + + pg_table = (pte_t *) __va(pg_table) + start_pte; + for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) { + pte_t pte; + + /* + * Map the fault vector writable so we can + * write the HPMC checksum. + */ + if (address >= ro_start && address < ro_end + && address != fv_addr + && address != gw_addr) + pte = __mk_pte(address, PAGE_KERNEL_RO); + else + pte = __mk_pte(address, pgprot); + + if (address >= end_paddr) + pte_val(pte) = 0; + + set_pte(pg_table, pte); + + address += PAGE_SIZE; + } + start_pte = 0; + + if (address >= end_paddr) + break; + } + start_pmd = 0; + } +} + +/* + * pagetable_init() sets up the page tables + * + * Note that gateway_init() places the Linux gateway page at page 0. + * Since gateway pages cannot be dereferenced this has the desirable + * side effect of trapping those pesky NULL-reference errors in the + * kernel. + */ +static void __init pagetable_init(void) +{ + int range; + + /* Map each physical memory range to its kernel vaddr */ + + for (range = 0; range < npmem_ranges; range++) { + unsigned long start_paddr; + unsigned long end_paddr; + unsigned long size; + + start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT; + end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT); + size = pmem_ranges[range].pages << PAGE_SHIFT; + + map_pages((unsigned long)__va(start_paddr), start_paddr, + size, PAGE_KERNEL); + } + +#ifdef CONFIG_BLK_DEV_INITRD + if (initrd_end && initrd_end > mem_limit) { + printk("initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end); + map_pages(initrd_start, __pa(initrd_start), + initrd_end - initrd_start, PAGE_KERNEL); + } +#endif + + empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); + memset(empty_zero_page, 0, PAGE_SIZE); +} + +static void __init gateway_init(void) +{ + unsigned long linux_gateway_page_addr; + /* FIXME: This is 'const' in order to trick the compiler + into not treating it as DP-relative data. */ + extern void * const linux_gateway_page; + + linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK; + + /* + * Setup Linux Gateway page. + * + * The Linux gateway page will reside in kernel space (on virtual + * page 0), so it doesn't need to be aliased into user space. + */ + + map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page), + PAGE_SIZE, PAGE_GATEWAY); +} + +#ifdef CONFIG_HPUX +void +map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm) +{ + pgd_t *pg_dir; + pmd_t *pmd; + pte_t *pg_table; + unsigned long start_pmd; + unsigned long start_pte; + unsigned long address; + unsigned long hpux_gw_page_addr; + /* FIXME: This is 'const' in order to trick the compiler + into not treating it as DP-relative data. */ + extern void * const hpux_gateway_page; + + hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK; + + /* + * Setup HP-UX Gateway page. + * + * The HP-UX gateway page resides in the user address space, + * so it needs to be aliased into each process. + */ + + pg_dir = pgd_offset(mm,hpux_gw_page_addr); + +#if PTRS_PER_PMD == 1 + start_pmd = 0; +#else + start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); +#endif + start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); + + address = __pa(&hpux_gateway_page); +#if PTRS_PER_PMD == 1 + pmd = (pmd_t *)__pa(pg_dir); +#else + pmd = (pmd_t *) pgd_address(*pg_dir); + + /* + * pmd is physical at this point + */ + + if (!pmd) { + pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL); + pmd = (pmd_t *) __pa(pmd); + } + + __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd); +#endif + /* now change pmd to kernel virtual addresses */ + + pmd = (pmd_t *)__va(pmd) + start_pmd; + + /* + * pg_table is physical at this point + */ + + pg_table = (pte_t *) pmd_address(*pmd); + if (!pg_table) + pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL)); + + __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table); + + /* now change pg_table to kernel virtual addresses */ + + pg_table = (pte_t *) __va(pg_table) + start_pte; + set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY)); +} +EXPORT_SYMBOL(map_hpux_gateway_page); +#endif + +extern void flush_tlb_all_local(void); + +void __init paging_init(void) +{ + int i; + + setup_bootmem(); + pagetable_init(); + gateway_init(); + flush_cache_all_local(); /* start with known state */ + flush_tlb_all_local(); + + for (i = 0; i < npmem_ranges; i++) { + unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0 }; + + /* We have an IOMMU, so all memory can go into a single + ZONE_DMA zone. */ + zones_size[ZONE_DMA] = pmem_ranges[i].pages; + +#ifdef CONFIG_DISCONTIGMEM + /* Need to initialize the pfnnid_map before we can initialize + the zone */ + { + int j; + for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT); + j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT); + j++) { + pfnnid_map[j] = i; + } + } +#endif + + free_area_init_node(i, NODE_DATA(i), zones_size, + pmem_ranges[i].start_pfn, NULL); + } +} + +#ifdef CONFIG_PA20 + +/* + * Currently, all PA20 chips have 18 bit protection id's, which is the + * limiting factor (space ids are 32 bits). + */ + +#define NR_SPACE_IDS 262144 + +#else + +/* + * Currently we have a one-to-one relationship between space id's and + * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only + * support 15 bit protection id's, so that is the limiting factor. + * PCXT' has 18 bit protection id's, but only 16 bit spaceids, so it's + * probably not worth the effort for a special case here. + */ + +#define NR_SPACE_IDS 32768 + +#endif /* !CONFIG_PA20 */ + +#define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2) +#define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long))) + +static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */ +static unsigned long dirty_space_id[SID_ARRAY_SIZE]; +static unsigned long space_id_index; +static unsigned long free_space_ids = NR_SPACE_IDS - 1; +static unsigned long dirty_space_ids = 0; + +static DEFINE_SPINLOCK(sid_lock); + +unsigned long alloc_sid(void) +{ + unsigned long index; + + spin_lock(&sid_lock); + + if (free_space_ids == 0) { + if (dirty_space_ids != 0) { + spin_unlock(&sid_lock); + flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */ + spin_lock(&sid_lock); + } + if (free_space_ids == 0) + BUG(); + } + + free_space_ids--; + + index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index); + space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1))); + space_id_index = index; + + spin_unlock(&sid_lock); + + return index << SPACEID_SHIFT; +} + +void free_sid(unsigned long spaceid) +{ + unsigned long index = spaceid >> SPACEID_SHIFT; + unsigned long *dirty_space_offset; + + dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG); + index &= (BITS_PER_LONG - 1); + + spin_lock(&sid_lock); + + if (*dirty_space_offset & (1L << index)) + BUG(); /* attempt to free space id twice */ + + *dirty_space_offset |= (1L << index); + dirty_space_ids++; + + spin_unlock(&sid_lock); +} + + +#ifdef CONFIG_SMP +static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array) +{ + int i; + + /* NOTE: sid_lock must be held upon entry */ + + *ndirtyptr = dirty_space_ids; + if (dirty_space_ids != 0) { + for (i = 0; i < SID_ARRAY_SIZE; i++) { + dirty_array[i] = dirty_space_id[i]; + dirty_space_id[i] = 0; + } + dirty_space_ids = 0; + } + + return; +} + +static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array) +{ + int i; + + /* NOTE: sid_lock must be held upon entry */ + + if (ndirty != 0) { + for (i = 0; i < SID_ARRAY_SIZE; i++) { + space_id[i] ^= dirty_array[i]; + } + + free_space_ids += ndirty; + space_id_index = 0; + } +} + +#else /* CONFIG_SMP */ + +static void recycle_sids(void) +{ + int i; + + /* NOTE: sid_lock must be held upon entry */ + + if (dirty_space_ids != 0) { + for (i = 0; i < SID_ARRAY_SIZE; i++) { + space_id[i] ^= dirty_space_id[i]; + dirty_space_id[i] = 0; + } + + free_space_ids += dirty_space_ids; + dirty_space_ids = 0; + space_id_index = 0; + } +} +#endif + +/* + * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is + * purged, we can safely reuse the space ids that were released but + * not flushed from the tlb. + */ + +#ifdef CONFIG_SMP + +static unsigned long recycle_ndirty; +static unsigned long recycle_dirty_array[SID_ARRAY_SIZE]; +static unsigned int recycle_inuse = 0; + +void flush_tlb_all(void) +{ + int do_recycle; + + do_recycle = 0; + spin_lock(&sid_lock); + if (dirty_space_ids > RECYCLE_THRESHOLD) { + if (recycle_inuse) { + BUG(); /* FIXME: Use a semaphore/wait queue here */ + } + get_dirty_sids(&recycle_ndirty,recycle_dirty_array); + recycle_inuse++; + do_recycle++; + } + spin_unlock(&sid_lock); + on_each_cpu((void (*)(void *))flush_tlb_all_local, NULL, 1, 1); + if (do_recycle) { + spin_lock(&sid_lock); + recycle_sids(recycle_ndirty,recycle_dirty_array); + recycle_inuse = 0; + spin_unlock(&sid_lock); + } +} +#else +void flush_tlb_all(void) +{ + spin_lock(&sid_lock); + flush_tlb_all_local(); + recycle_sids(); + spin_unlock(&sid_lock); +} +#endif + +#ifdef CONFIG_BLK_DEV_INITRD +void free_initrd_mem(unsigned long start, unsigned long end) +{ +#if 0 + if (start < end) + printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10); + for (; start < end; start += PAGE_SIZE) { + ClearPageReserved(virt_to_page(start)); + set_page_count(virt_to_page(start), 1); + free_page(start); + num_physpages++; + totalram_pages++; + } +#endif +} +#endif |