void setup_arch(void) {
setup_memory_map();
finish_e820_parsing();
max_pfn = e820_end_of_ram_pfn();
/* preallocate 4k for mptable mpc */
/*
early_reserve_e820_mpc_new();
*/
/* update e820 for memory not covered by WB MTRRs */
/*
mtrr_bp_init();
if (mtrr_trim_uncached_memory(max_pfn)) {
max_pfn = e820_end_of_ram_pfn();
}
*/
/* max_low_pfn get updated here */
find_low_pfn_range();
printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
max_pfn_mapped<<PAGE_SHIFT);
max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
max_pfn_mapped = max_low_pfn_mapped;
initmem_init(0, max_pfn);
}
static int __init balloon_init(void)
{
unsigned long pfn, extra_pfn_end;
struct page *page;
if (!xen_pv_domain())
return -ENODEV;
pr_info("xen_balloon: Initialising balloon driver.\n");
balloon_stats.current_pages = min(xen_start_info->nr_pages, max_pfn);
balloon_stats.target_pages = balloon_stats.current_pages;
balloon_stats.balloon_low = 0;
balloon_stats.balloon_high = 0;
init_timer(&balloon_timer);
balloon_timer.data = 0;
balloon_timer.function = balloon_alarm;
register_balloon(&balloon_sysdev);
/*
* Initialise the balloon with excess memory space. We need
* to make sure we don't add memory which doesn't exist or
* logically exist. The E820 map can be trimmed to be smaller
* than the amount of physical memory due to the mem= command
* line parameter. And if this is a 32-bit non-HIGHMEM kernel
* on a system with memory which requires highmem to access,
* don't try to use it.
*/
extra_pfn_end = min(min(max_pfn, e820_end_of_ram_pfn()),
(unsigned long)PFN_DOWN(xen_extra_mem_start + xen_extra_mem_size));
for (pfn = PFN_UP(xen_extra_mem_start);
pfn < extra_pfn_end;
pfn++) {
page = pfn_to_page(pfn);
/* totalram_pages and totalhigh_pages do not include the boot-time
balloon extension, so don't subtract from it. */
__balloon_append(page);
}
target_watch.callback = watch_target;
xenstore_notifier.notifier_call = balloon_init_watcher;
register_xenstore_notifier(&xenstore_notifier);
return 0;
}
