char * __init xen_memory_setup(void) { unsigned long max_pfn = xen_start_info->nr_pages; max_pfn = min(MAX_DOMAIN_PAGES, max_pfn); e820.nr_map = 0; e820_add_region(0, PFN_PHYS((u64)max_pfn), E820_RAM); /* * Even though this is normal, usable memory under Xen, reserve * ISA memory anyway because too many things think they can poke * about in there. */ e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS, E820_RESERVED); /* * Reserve Xen bits: * - mfn_list * - xen_start_info * See comment above "struct start_info" in <xen/interface/xen.h> */ memblock_x86_reserve_range(__pa(xen_start_info->mfn_list), __pa(xen_start_info->pt_base), "XEN START INFO"); sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); xen_return_unused_memory(xen_start_info->nr_pages, &e820); return "Xen"; }
/** * machine_specific_memory_setup - Hook for machine specific memory setup. **/ char * __init xen_memory_setup(void) { static struct e820entry map[E820MAX] __initdata; static struct e820entry map_raw[E820MAX] __initdata; unsigned long max_pfn = xen_start_info->nr_pages; unsigned long long mem_end; int rc; struct xen_memory_map memmap; unsigned long extra_pages = 0; unsigned long extra_limit; unsigned long identity_pages = 0; int i; int op; max_pfn = min(MAX_DOMAIN_PAGES, max_pfn); mem_end = PFN_PHYS(max_pfn); memmap.nr_entries = E820MAX; set_xen_guest_handle(memmap.buffer, map); op = xen_initial_domain() ? XENMEM_machine_memory_map : XENMEM_memory_map; rc = HYPERVISOR_memory_op(op, &memmap); if (rc == -ENOSYS) { BUG_ON(xen_initial_domain()); memmap.nr_entries = 1; map[0].addr = 0ULL; map[0].size = mem_end; /* 8MB slack (to balance backend allocations). */ map[0].size += 8ULL << 20; map[0].type = E820_RAM; rc = 0; } BUG_ON(rc); memcpy(map_raw, map, sizeof(map)); e820.nr_map = 0; xen_extra_mem_start = mem_end; for (i = 0; i < memmap.nr_entries; i++) { unsigned long long end; /* Guard against non-page aligned E820 entries. */ if (map[i].type == E820_RAM) map[i].size -= (map[i].size + map[i].addr) % PAGE_SIZE; end = map[i].addr + map[i].size; if (map[i].type == E820_RAM && end > mem_end) { /* RAM off the end - may be partially included */ u64 delta = min(map[i].size, end - mem_end); map[i].size -= delta; end -= delta; extra_pages += PFN_DOWN(delta); /* * Set RAM below 4GB that is not for us to be unusable. * This prevents "System RAM" address space from being * used as potential resource for I/O address (happens * when 'allocate_resource' is called). */ if (delta && (xen_initial_domain() && end < 0x100000000ULL)) e820_add_region(end, delta, E820_UNUSABLE); } if (map[i].size > 0 && end > xen_extra_mem_start) xen_extra_mem_start = end; /* Add region if any remains */ if (map[i].size > 0) e820_add_region(map[i].addr, map[i].size, map[i].type); } /* Align the balloon area so that max_low_pfn does not get set * to be at the _end_ of the PCI gap at the far end (fee01000). * Note that xen_extra_mem_start gets set in the loop above to be * past the last E820 region. */ if (xen_initial_domain() && (xen_extra_mem_start < (1ULL<<32))) xen_extra_mem_start = (1ULL<<32); /* * In domU, the ISA region is normal, usable memory, but we * reserve ISA memory anyway because too many things poke * about in there. * * In Dom0, the host E820 information can leave gaps in the * ISA range, which would cause us to release those pages. To * avoid this, we unconditionally reserve them here. */ e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS, E820_RESERVED); /* * Reserve Xen bits: * - mfn_list * - xen_start_info * See comment above "struct start_info" in <xen/interface/xen.h> */ memblock_reserve(__pa(xen_start_info->mfn_list), xen_start_info->pt_base - xen_start_info->mfn_list); sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); extra_limit = xen_get_max_pages(); if (max_pfn + extra_pages > extra_limit) { if (extra_limit > max_pfn) extra_pages = extra_limit - max_pfn; else extra_pages = 0; } extra_pages += xen_return_unused_memory(xen_start_info->nr_pages, &e820); /* * Clamp the amount of extra memory to a EXTRA_MEM_RATIO * factor the base size. On non-highmem systems, the base * size is the full initial memory allocation; on highmem it * is limited to the max size of lowmem, so that it doesn't * get completely filled. * * In principle there could be a problem in lowmem systems if * the initial memory is also very large with respect to * lowmem, but we won't try to deal with that here. */ extra_limit = min(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)), max_pfn + extra_pages); if (extra_limit >= max_pfn) extra_pages = extra_limit - max_pfn; else extra_pages = 0; xen_add_extra_mem(extra_pages); /* * Set P2M for all non-RAM pages and E820 gaps to be identity * type PFNs. We supply it with the non-sanitized version * of the E820. */ identity_pages = xen_set_identity(map_raw, memmap.nr_entries); printk(KERN_INFO "Set %ld page(s) to 1-1 mapping.\n", identity_pages); return "Xen"; }
/** * machine_specific_memory_setup - Hook for machine specific memory setup. **/ char * __init xen_memory_setup(void) { static struct e820entry map[E820MAX] __initdata; unsigned long max_pfn = xen_start_info->nr_pages; unsigned long long mem_end; int rc; struct xen_memory_map memmap; unsigned long extra_pages = 0; unsigned long extra_limit; int i; int op; max_pfn = min(MAX_DOMAIN_PAGES, max_pfn); mem_end = PFN_PHYS(max_pfn); memmap.nr_entries = E820MAX; set_xen_guest_handle(memmap.buffer, map); op = xen_initial_domain() ? XENMEM_machine_memory_map : XENMEM_memory_map; rc = HYPERVISOR_memory_op(op, &memmap); if (rc == -ENOSYS) { BUG_ON(xen_initial_domain()); memmap.nr_entries = 1; map[0].addr = 0ULL; map[0].size = mem_end; /* 8MB slack (to balance backend allocations). */ map[0].size += 8ULL << 20; map[0].type = E820_RAM; rc = 0; } BUG_ON(rc); e820.nr_map = 0; xen_extra_mem_start = mem_end; for (i = 0; i < memmap.nr_entries; i++) { unsigned long long end = map[i].addr + map[i].size; if (map[i].type == E820_RAM) { if (map[i].addr < mem_end && end > mem_end) { /* Truncate region to max_mem. */ u64 delta = end - mem_end; map[i].size -= delta; extra_pages += PFN_DOWN(delta); end = mem_end; } } if (end > xen_extra_mem_start) xen_extra_mem_start = end; /* If region is non-RAM or below mem_end, add what remains */ if ((map[i].type != E820_RAM || map[i].addr < mem_end) && map[i].size > 0) e820_add_region(map[i].addr, map[i].size, map[i].type); } /* * In domU, the ISA region is normal, usable memory, but we * reserve ISA memory anyway because too many things poke * about in there. * * In Dom0, the host E820 information can leave gaps in the * ISA range, which would cause us to release those pages. To * avoid this, we unconditionally reserve them here. */ e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS, E820_RESERVED); /* * Reserve Xen bits: * - mfn_list * - xen_start_info * See comment above "struct start_info" in <xen/interface/xen.h> */ memblock_x86_reserve_range(__pa(xen_start_info->mfn_list), __pa(xen_start_info->pt_base), "XEN START INFO"); sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); extra_pages += xen_return_unused_memory(xen_start_info->nr_pages, &e820); /* * Clamp the amount of extra memory to a EXTRA_MEM_RATIO * factor the base size. On non-highmem systems, the base * size is the full initial memory allocation; on highmem it * is limited to the max size of lowmem, so that it doesn't * get completely filled. * * In principle there could be a problem in lowmem systems if * the initial memory is also very large with respect to * lowmem, but we won't try to deal with that here. */ extra_limit = min(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)), max_pfn + extra_pages); if (extra_limit >= max_pfn) extra_pages = extra_limit - max_pfn; else extra_pages = 0; if (!xen_initial_domain()) xen_add_extra_mem(extra_pages); return "Xen"; }