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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d0ec2c6f2c
This patch makes early reserved highmem pages become reserved pages. This can be used for highmem pages allocated by bootloader such as EFI memory map, linked list of setup_data, etc. Signed-off-by: Huang Ying <ying.huang@intel.com> Cc: andi@firstfloor.org Cc: mingo@redhat.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
897 lines
22 KiB
C
897 lines
22 KiB
C
/*
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* Handle the memory map.
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* The functions here do the job until bootmem takes over.
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*
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* Getting sanitize_e820_map() in sync with i386 version by applying change:
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* - Provisions for empty E820 memory regions (reported by certain BIOSes).
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* Alex Achenbach <xela@slit.de>, December 2002.
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* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/ioport.h>
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#include <linux/string.h>
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#include <linux/kexec.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/pfn.h>
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#include <linux/suspend.h>
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#include <asm/pgtable.h>
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#include <asm/page.h>
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#include <asm/e820.h>
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#include <asm/proto.h>
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#include <asm/setup.h>
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#include <asm/trampoline.h>
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struct e820map e820;
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/* For PCI or other memory-mapped resources */
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unsigned long pci_mem_start = 0xaeedbabe;
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#ifdef CONFIG_PCI
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EXPORT_SYMBOL(pci_mem_start);
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#endif
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/*
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* This function checks if any part of the range <start,end> is mapped
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* with type.
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*/
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int
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e820_any_mapped(u64 start, u64 end, unsigned type)
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{
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int i;
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for (i = 0; i < e820.nr_map; i++) {
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struct e820entry *ei = &e820.map[i];
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if (type && ei->type != type)
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continue;
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if (ei->addr >= end || ei->addr + ei->size <= start)
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continue;
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return 1;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(e820_any_mapped);
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/*
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* This function checks if the entire range <start,end> is mapped with type.
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*
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* Note: this function only works correct if the e820 table is sorted and
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* not-overlapping, which is the case
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*/
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int __init e820_all_mapped(u64 start, u64 end, unsigned type)
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{
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int i;
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for (i = 0; i < e820.nr_map; i++) {
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struct e820entry *ei = &e820.map[i];
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if (type && ei->type != type)
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continue;
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/* is the region (part) in overlap with the current region ?*/
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if (ei->addr >= end || ei->addr + ei->size <= start)
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continue;
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/* if the region is at the beginning of <start,end> we move
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* start to the end of the region since it's ok until there
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*/
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if (ei->addr <= start)
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start = ei->addr + ei->size;
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/*
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* if start is now at or beyond end, we're done, full
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* coverage
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*/
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if (start >= end)
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return 1;
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}
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return 0;
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}
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/*
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* Add a memory region to the kernel e820 map.
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*/
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void __init add_memory_region(u64 start, u64 size, int type)
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{
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int x = e820.nr_map;
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if (x == ARRAY_SIZE(e820.map)) {
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printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
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return;
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}
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e820.map[x].addr = start;
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e820.map[x].size = size;
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e820.map[x].type = type;
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e820.nr_map++;
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}
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void __init e820_print_map(char *who)
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{
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int i;
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for (i = 0; i < e820.nr_map; i++) {
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printk(KERN_INFO " %s: %016Lx - %016Lx ", who,
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(unsigned long long) e820.map[i].addr,
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(unsigned long long)
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(e820.map[i].addr + e820.map[i].size));
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switch (e820.map[i].type) {
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case E820_RAM:
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printk(KERN_CONT "(usable)\n");
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break;
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case E820_RESERVED:
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printk(KERN_CONT "(reserved)\n");
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break;
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case E820_ACPI:
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printk(KERN_CONT "(ACPI data)\n");
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break;
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case E820_NVS:
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printk(KERN_CONT "(ACPI NVS)\n");
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break;
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default:
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printk(KERN_CONT "type %u\n", e820.map[i].type);
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break;
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}
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}
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}
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/*
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* Sanitize the BIOS e820 map.
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*
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* Some e820 responses include overlapping entries. The following
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* replaces the original e820 map with a new one, removing overlaps,
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* and resolving conflicting memory types in favor of highest
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* numbered type.
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*
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* The input parameter biosmap points to an array of 'struct
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* e820entry' which on entry has elements in the range [0, *pnr_map)
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* valid, and which has space for up to max_nr_map entries.
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* On return, the resulting sanitized e820 map entries will be in
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* overwritten in the same location, starting at biosmap.
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*
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* The integer pointed to by pnr_map must be valid on entry (the
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* current number of valid entries located at biosmap) and will
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* be updated on return, with the new number of valid entries
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* (something no more than max_nr_map.)
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*
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* The return value from sanitize_e820_map() is zero if it
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* successfully 'sanitized' the map entries passed in, and is -1
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* if it did nothing, which can happen if either of (1) it was
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* only passed one map entry, or (2) any of the input map entries
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* were invalid (start + size < start, meaning that the size was
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* so big the described memory range wrapped around through zero.)
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*
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* Visually we're performing the following
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* (1,2,3,4 = memory types)...
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*
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* Sample memory map (w/overlaps):
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* ____22__________________
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* ______________________4_
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* ____1111________________
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* _44_____________________
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* 11111111________________
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* ____________________33__
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* ___________44___________
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* __________33333_________
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* ______________22________
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* ___________________2222_
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* _________111111111______
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* _____________________11_
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* _________________4______
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*
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* Sanitized equivalent (no overlap):
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* 1_______________________
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* _44_____________________
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* ___1____________________
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* ____22__________________
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* ______11________________
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* _________1______________
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* __________3_____________
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* ___________44___________
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* _____________33_________
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* _______________2________
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* ________________1_______
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* _________________4______
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* ___________________2____
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* ____________________33__
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* ______________________4_
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*/
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int __init sanitize_e820_map(struct e820entry *biosmap, int max_nr_map,
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int *pnr_map)
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{
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struct change_member {
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struct e820entry *pbios; /* pointer to original bios entry */
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unsigned long long addr; /* address for this change point */
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};
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static struct change_member change_point_list[2*E820_X_MAX] __initdata;
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static struct change_member *change_point[2*E820_X_MAX] __initdata;
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static struct e820entry *overlap_list[E820_X_MAX] __initdata;
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static struct e820entry new_bios[E820_X_MAX] __initdata;
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struct change_member *change_tmp;
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unsigned long current_type, last_type;
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unsigned long long last_addr;
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int chgidx, still_changing;
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int overlap_entries;
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int new_bios_entry;
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int old_nr, new_nr, chg_nr;
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int i;
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/* if there's only one memory region, don't bother */
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if (*pnr_map < 2)
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return -1;
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old_nr = *pnr_map;
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BUG_ON(old_nr > max_nr_map);
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/* bail out if we find any unreasonable addresses in bios map */
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for (i = 0; i < old_nr; i++)
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if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr)
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return -1;
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/* create pointers for initial change-point information (for sorting) */
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for (i = 0; i < 2 * old_nr; i++)
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change_point[i] = &change_point_list[i];
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/* record all known change-points (starting and ending addresses),
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omitting those that are for empty memory regions */
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chgidx = 0;
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for (i = 0; i < old_nr; i++) {
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if (biosmap[i].size != 0) {
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change_point[chgidx]->addr = biosmap[i].addr;
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change_point[chgidx++]->pbios = &biosmap[i];
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change_point[chgidx]->addr = biosmap[i].addr +
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biosmap[i].size;
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change_point[chgidx++]->pbios = &biosmap[i];
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}
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}
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chg_nr = chgidx;
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/* sort change-point list by memory addresses (low -> high) */
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still_changing = 1;
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while (still_changing) {
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still_changing = 0;
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for (i = 1; i < chg_nr; i++) {
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unsigned long long curaddr, lastaddr;
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unsigned long long curpbaddr, lastpbaddr;
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curaddr = change_point[i]->addr;
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lastaddr = change_point[i - 1]->addr;
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curpbaddr = change_point[i]->pbios->addr;
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lastpbaddr = change_point[i - 1]->pbios->addr;
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/*
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* swap entries, when:
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*
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* curaddr > lastaddr or
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* curaddr == lastaddr and curaddr == curpbaddr and
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* lastaddr != lastpbaddr
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*/
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if (curaddr < lastaddr ||
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(curaddr == lastaddr && curaddr == curpbaddr &&
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lastaddr != lastpbaddr)) {
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change_tmp = change_point[i];
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change_point[i] = change_point[i-1];
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change_point[i-1] = change_tmp;
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still_changing = 1;
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}
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}
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}
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/* create a new bios memory map, removing overlaps */
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overlap_entries = 0; /* number of entries in the overlap table */
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new_bios_entry = 0; /* index for creating new bios map entries */
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last_type = 0; /* start with undefined memory type */
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last_addr = 0; /* start with 0 as last starting address */
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/* loop through change-points, determining affect on the new bios map */
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for (chgidx = 0; chgidx < chg_nr; chgidx++) {
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/* keep track of all overlapping bios entries */
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if (change_point[chgidx]->addr ==
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change_point[chgidx]->pbios->addr) {
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/*
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* add map entry to overlap list (> 1 entry
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* implies an overlap)
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*/
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overlap_list[overlap_entries++] =
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change_point[chgidx]->pbios;
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} else {
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/*
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* remove entry from list (order independent,
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* so swap with last)
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*/
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for (i = 0; i < overlap_entries; i++) {
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if (overlap_list[i] ==
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change_point[chgidx]->pbios)
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overlap_list[i] =
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overlap_list[overlap_entries-1];
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}
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overlap_entries--;
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}
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/*
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* if there are overlapping entries, decide which
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* "type" to use (larger value takes precedence --
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* 1=usable, 2,3,4,4+=unusable)
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*/
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current_type = 0;
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for (i = 0; i < overlap_entries; i++)
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if (overlap_list[i]->type > current_type)
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current_type = overlap_list[i]->type;
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/*
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* continue building up new bios map based on this
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* information
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*/
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if (current_type != last_type) {
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if (last_type != 0) {
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new_bios[new_bios_entry].size =
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change_point[chgidx]->addr - last_addr;
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/*
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* move forward only if the new size
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* was non-zero
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*/
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if (new_bios[new_bios_entry].size != 0)
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/*
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* no more space left for new
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* bios entries ?
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*/
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if (++new_bios_entry >= max_nr_map)
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break;
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}
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if (current_type != 0) {
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new_bios[new_bios_entry].addr =
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change_point[chgidx]->addr;
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new_bios[new_bios_entry].type = current_type;
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last_addr = change_point[chgidx]->addr;
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}
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last_type = current_type;
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}
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}
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/* retain count for new bios entries */
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new_nr = new_bios_entry;
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/* copy new bios mapping into original location */
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memcpy(biosmap, new_bios, new_nr * sizeof(struct e820entry));
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*pnr_map = new_nr;
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return 0;
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}
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/*
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* Copy the BIOS e820 map into a safe place.
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*
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* Sanity-check it while we're at it..
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*
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* If we're lucky and live on a modern system, the setup code
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* will have given us a memory map that we can use to properly
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* set up memory. If we aren't, we'll fake a memory map.
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*/
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int __init copy_e820_map(struct e820entry *biosmap, int nr_map)
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{
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/* Only one memory region (or negative)? Ignore it */
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if (nr_map < 2)
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return -1;
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do {
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u64 start = biosmap->addr;
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u64 size = biosmap->size;
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u64 end = start + size;
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u32 type = biosmap->type;
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/* Overflow in 64 bits? Ignore the memory map. */
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if (start > end)
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return -1;
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add_memory_region(start, size, type);
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} while (biosmap++, --nr_map);
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return 0;
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}
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u64 __init update_memory_range(u64 start, u64 size, unsigned old_type,
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unsigned new_type)
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{
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int i;
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u64 real_updated_size = 0;
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BUG_ON(old_type == new_type);
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for (i = 0; i < e820.nr_map; i++) {
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struct e820entry *ei = &e820.map[i];
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u64 final_start, final_end;
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if (ei->type != old_type)
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continue;
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/* totally covered? */
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if (ei->addr >= start &&
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(ei->addr + ei->size) <= (start + size)) {
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ei->type = new_type;
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real_updated_size += ei->size;
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continue;
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}
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/* partially covered */
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final_start = max(start, ei->addr);
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final_end = min(start + size, ei->addr + ei->size);
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if (final_start >= final_end)
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continue;
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add_memory_region(final_start, final_end - final_start,
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new_type);
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real_updated_size += final_end - final_start;
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}
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return real_updated_size;
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}
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void __init update_e820(void)
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{
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int nr_map;
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nr_map = e820.nr_map;
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if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr_map))
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return;
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e820.nr_map = nr_map;
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printk(KERN_INFO "modified physical RAM map:\n");
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e820_print_map("modified");
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}
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/*
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* Search for the biggest gap in the low 32 bits of the e820
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* memory space. We pass this space to PCI to assign MMIO resources
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* for hotplug or unconfigured devices in.
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* Hopefully the BIOS let enough space left.
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*/
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__init void e820_setup_gap(void)
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{
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unsigned long gapstart, gapsize, round;
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unsigned long long last;
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int i;
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int found = 0;
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last = 0x100000000ull;
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gapstart = 0x10000000;
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gapsize = 0x400000;
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i = e820.nr_map;
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while (--i >= 0) {
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unsigned long long start = e820.map[i].addr;
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unsigned long long end = start + e820.map[i].size;
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/*
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* Since "last" is at most 4GB, we know we'll
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* fit in 32 bits if this condition is true
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*/
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if (last > end) {
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unsigned long gap = last - end;
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if (gap > gapsize) {
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gapsize = gap;
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gapstart = end;
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found = 1;
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}
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}
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if (start < last)
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last = start;
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}
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#ifdef CONFIG_X86_64
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if (!found) {
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gapstart = (end_pfn << PAGE_SHIFT) + 1024*1024;
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printk(KERN_ERR "PCI: Warning: Cannot find a gap in the 32bit "
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"address range\n"
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KERN_ERR "PCI: Unassigned devices with 32bit resource "
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"registers may break!\n");
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}
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#endif
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/*
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* See how much we want to round up: start off with
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* rounding to the next 1MB area.
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*/
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round = 0x100000;
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while ((gapsize >> 4) > round)
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round += round;
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/* Fun with two's complement */
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pci_mem_start = (gapstart + round) & -round;
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printk(KERN_INFO
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"Allocating PCI resources starting at %lx (gap: %lx:%lx)\n",
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pci_mem_start, gapstart, gapsize);
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}
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#if defined(CONFIG_X86_64) || \
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(defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
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/**
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* Find the ranges of physical addresses that do not correspond to
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* e820 RAM areas and mark the corresponding pages as nosave for
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* hibernation (32 bit) or software suspend and suspend to RAM (64 bit).
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*
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* This function requires the e820 map to be sorted and without any
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* overlapping entries and assumes the first e820 area to be RAM.
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*/
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void __init e820_mark_nosave_regions(unsigned long limit_pfn)
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{
|
|
int i;
|
|
unsigned long pfn;
|
|
|
|
pfn = PFN_DOWN(e820.map[0].addr + e820.map[0].size);
|
|
for (i = 1; i < e820.nr_map; i++) {
|
|
struct e820entry *ei = &e820.map[i];
|
|
|
|
if (pfn < PFN_UP(ei->addr))
|
|
register_nosave_region(pfn, PFN_UP(ei->addr));
|
|
|
|
pfn = PFN_DOWN(ei->addr + ei->size);
|
|
if (ei->type != E820_RAM)
|
|
register_nosave_region(PFN_UP(ei->addr), pfn);
|
|
|
|
if (pfn >= limit_pfn)
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Early reserved memory areas.
|
|
*/
|
|
#define MAX_EARLY_RES 20
|
|
|
|
struct early_res {
|
|
u64 start, end;
|
|
char name[16];
|
|
};
|
|
static struct early_res early_res[MAX_EARLY_RES] __initdata = {
|
|
{ 0, PAGE_SIZE, "BIOS data page" }, /* BIOS data page */
|
|
#if defined(CONFIG_X86_64) && defined(CONFIG_X86_TRAMPOLINE)
|
|
{ TRAMPOLINE_BASE, TRAMPOLINE_BASE + 2 * PAGE_SIZE, "TRAMPOLINE" },
|
|
#endif
|
|
#if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
|
|
/*
|
|
* But first pinch a few for the stack/trampoline stuff
|
|
* FIXME: Don't need the extra page at 4K, but need to fix
|
|
* trampoline before removing it. (see the GDT stuff)
|
|
*/
|
|
{ PAGE_SIZE, PAGE_SIZE + PAGE_SIZE, "EX TRAMPOLINE" },
|
|
/*
|
|
* Has to be in very low memory so we can execute
|
|
* real-mode AP code.
|
|
*/
|
|
{ TRAMPOLINE_BASE, TRAMPOLINE_BASE + PAGE_SIZE, "TRAMPOLINE" },
|
|
#endif
|
|
{}
|
|
};
|
|
|
|
static int __init find_overlapped_early(u64 start, u64 end)
|
|
{
|
|
int i;
|
|
struct early_res *r;
|
|
|
|
for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
|
|
r = &early_res[i];
|
|
if (end > r->start && start < r->end)
|
|
break;
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
void __init reserve_early(u64 start, u64 end, char *name)
|
|
{
|
|
int i;
|
|
struct early_res *r;
|
|
|
|
i = find_overlapped_early(start, end);
|
|
if (i >= MAX_EARLY_RES)
|
|
panic("Too many early reservations");
|
|
r = &early_res[i];
|
|
if (r->end)
|
|
panic("Overlapping early reservations "
|
|
"%llx-%llx %s to %llx-%llx %s\n",
|
|
start, end - 1, name?name:"", r->start,
|
|
r->end - 1, r->name);
|
|
r->start = start;
|
|
r->end = end;
|
|
if (name)
|
|
strncpy(r->name, name, sizeof(r->name) - 1);
|
|
}
|
|
|
|
void __init free_early(u64 start, u64 end)
|
|
{
|
|
struct early_res *r;
|
|
int i, j;
|
|
|
|
i = find_overlapped_early(start, end);
|
|
r = &early_res[i];
|
|
if (i >= MAX_EARLY_RES || r->end != end || r->start != start)
|
|
panic("free_early on not reserved area: %llx-%llx!",
|
|
start, end - 1);
|
|
|
|
for (j = i + 1; j < MAX_EARLY_RES && early_res[j].end; j++)
|
|
;
|
|
|
|
memmove(&early_res[i], &early_res[i + 1],
|
|
(j - 1 - i) * sizeof(struct early_res));
|
|
|
|
early_res[j - 1].end = 0;
|
|
}
|
|
|
|
int __init page_is_reserved_early(unsigned long pagenr)
|
|
{
|
|
u64 start = (u64)pagenr << PAGE_SHIFT;
|
|
int i;
|
|
struct early_res *r;
|
|
|
|
i = find_overlapped_early(start, start + PAGE_SIZE);
|
|
r = &early_res[i];
|
|
return (i < MAX_EARLY_RES && r->end);
|
|
}
|
|
|
|
void __init early_res_to_bootmem(u64 start, u64 end)
|
|
{
|
|
int i;
|
|
u64 final_start, final_end;
|
|
for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
|
|
struct early_res *r = &early_res[i];
|
|
final_start = max(start, r->start);
|
|
final_end = min(end, r->end);
|
|
if (final_start >= final_end)
|
|
continue;
|
|
printk(KERN_INFO " early res: %d [%llx-%llx] %s\n", i,
|
|
final_start, final_end - 1, r->name);
|
|
#ifdef CONFIG_X86_64
|
|
reserve_bootmem_generic(final_start, final_end - final_start);
|
|
#else
|
|
reserve_bootmem(final_start, final_end - final_start,
|
|
BOOTMEM_DEFAULT);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/* Check for already reserved areas */
|
|
static inline int __init bad_addr(u64 *addrp, u64 size, u64 align)
|
|
{
|
|
int i;
|
|
u64 addr = *addrp;
|
|
int changed = 0;
|
|
struct early_res *r;
|
|
again:
|
|
i = find_overlapped_early(addr, addr + size);
|
|
r = &early_res[i];
|
|
if (i < MAX_EARLY_RES && r->end) {
|
|
*addrp = addr = round_up(r->end, align);
|
|
changed = 1;
|
|
goto again;
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
/* Check for already reserved areas */
|
|
static inline int __init bad_addr_size(u64 *addrp, u64 *sizep, u64 align)
|
|
{
|
|
int i;
|
|
u64 addr = *addrp, last;
|
|
u64 size = *sizep;
|
|
int changed = 0;
|
|
again:
|
|
last = addr + size;
|
|
for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
|
|
struct early_res *r = &early_res[i];
|
|
if (last > r->start && addr < r->start) {
|
|
size = r->start - addr;
|
|
changed = 1;
|
|
goto again;
|
|
}
|
|
if (last > r->end && addr < r->end) {
|
|
addr = round_up(r->end, align);
|
|
size = last - addr;
|
|
changed = 1;
|
|
goto again;
|
|
}
|
|
if (last <= r->end && addr >= r->start) {
|
|
(*sizep)++;
|
|
return 0;
|
|
}
|
|
}
|
|
if (changed) {
|
|
*addrp = addr;
|
|
*sizep = size;
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
/*
|
|
* Find a free area with specified alignment in a specific range.
|
|
*/
|
|
u64 __init find_e820_area(u64 start, u64 end, u64 size, u64 align)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < e820.nr_map; i++) {
|
|
struct e820entry *ei = &e820.map[i];
|
|
u64 addr, last;
|
|
u64 ei_last;
|
|
|
|
if (ei->type != E820_RAM)
|
|
continue;
|
|
addr = round_up(ei->addr, align);
|
|
ei_last = ei->addr + ei->size;
|
|
if (addr < start)
|
|
addr = round_up(start, align);
|
|
if (addr >= ei_last)
|
|
continue;
|
|
while (bad_addr(&addr, size, align) && addr+size <= ei_last)
|
|
;
|
|
last = addr + size;
|
|
if (last > ei_last)
|
|
continue;
|
|
if (last > end)
|
|
continue;
|
|
return addr;
|
|
}
|
|
return -1ULL;
|
|
}
|
|
|
|
/*
|
|
* Find next free range after *start
|
|
*/
|
|
u64 __init find_e820_area_size(u64 start, u64 *sizep, u64 align)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < e820.nr_map; i++) {
|
|
struct e820entry *ei = &e820.map[i];
|
|
u64 addr, last;
|
|
u64 ei_last;
|
|
|
|
if (ei->type != E820_RAM)
|
|
continue;
|
|
addr = round_up(ei->addr, align);
|
|
ei_last = ei->addr + ei->size;
|
|
if (addr < start)
|
|
addr = round_up(start, align);
|
|
if (addr >= ei_last)
|
|
continue;
|
|
*sizep = ei_last - addr;
|
|
while (bad_addr_size(&addr, sizep, align) &&
|
|
addr + *sizep <= ei_last)
|
|
;
|
|
last = addr + *sizep;
|
|
if (last > ei_last)
|
|
continue;
|
|
return addr;
|
|
}
|
|
return -1UL;
|
|
|
|
}
|
|
|
|
/*
|
|
* pre allocated 4k and reserved it in e820
|
|
*/
|
|
u64 __init early_reserve_e820(u64 startt, u64 sizet, u64 align)
|
|
{
|
|
u64 size = 0;
|
|
u64 addr;
|
|
u64 start;
|
|
|
|
start = startt;
|
|
while (size < sizet)
|
|
start = find_e820_area_size(start, &size, align);
|
|
|
|
if (size < sizet)
|
|
return 0;
|
|
|
|
addr = round_down(start + size - sizet, align);
|
|
update_memory_range(addr, sizet, E820_RAM, E820_RESERVED);
|
|
printk(KERN_INFO "update e820 for early_reserve_e820\n");
|
|
update_e820();
|
|
|
|
return addr;
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
# ifdef CONFIG_X86_PAE
|
|
# define MAX_ARCH_PFN (1ULL<<(36-PAGE_SHIFT))
|
|
# else
|
|
# define MAX_ARCH_PFN (1ULL<<(32-PAGE_SHIFT))
|
|
# endif
|
|
#else /* CONFIG_X86_32 */
|
|
# define MAX_ARCH_PFN MAXMEM>>PAGE_SHIFT
|
|
#endif
|
|
|
|
/*
|
|
* Last pfn which the user wants to use.
|
|
*/
|
|
unsigned long __initdata end_user_pfn = MAX_ARCH_PFN;
|
|
|
|
/*
|
|
* Find the highest page frame number we have available
|
|
*/
|
|
unsigned long __init e820_end_of_ram(void)
|
|
{
|
|
unsigned long last_pfn;
|
|
unsigned long max_arch_pfn = MAX_ARCH_PFN;
|
|
|
|
last_pfn = find_max_pfn_with_active_regions();
|
|
|
|
if (last_pfn > max_arch_pfn)
|
|
last_pfn = max_arch_pfn;
|
|
if (last_pfn > end_user_pfn)
|
|
last_pfn = end_user_pfn;
|
|
|
|
printk(KERN_INFO "last_pfn = %lu max_arch_pfn = %lu\n",
|
|
last_pfn, max_arch_pfn);
|
|
return last_pfn;
|
|
}
|
|
|
|
/*
|
|
* Finds an active region in the address range from start_pfn to last_pfn and
|
|
* returns its range in ei_startpfn and ei_endpfn for the e820 entry.
|
|
*/
|
|
int __init e820_find_active_region(const struct e820entry *ei,
|
|
unsigned long start_pfn,
|
|
unsigned long last_pfn,
|
|
unsigned long *ei_startpfn,
|
|
unsigned long *ei_endpfn)
|
|
{
|
|
u64 align = PAGE_SIZE;
|
|
|
|
*ei_startpfn = round_up(ei->addr, align) >> PAGE_SHIFT;
|
|
*ei_endpfn = round_down(ei->addr + ei->size, align) >> PAGE_SHIFT;
|
|
|
|
/* Skip map entries smaller than a page */
|
|
if (*ei_startpfn >= *ei_endpfn)
|
|
return 0;
|
|
|
|
/* Skip if map is outside the node */
|
|
if (ei->type != E820_RAM || *ei_endpfn <= start_pfn ||
|
|
*ei_startpfn >= last_pfn)
|
|
return 0;
|
|
|
|
/* Check for overlaps */
|
|
if (*ei_startpfn < start_pfn)
|
|
*ei_startpfn = start_pfn;
|
|
if (*ei_endpfn > last_pfn)
|
|
*ei_endpfn = last_pfn;
|
|
|
|
/* Obey end_user_pfn to save on memmap */
|
|
if (*ei_startpfn >= end_user_pfn)
|
|
return 0;
|
|
if (*ei_endpfn > end_user_pfn)
|
|
*ei_endpfn = end_user_pfn;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Walk the e820 map and register active regions within a node */
|
|
void __init e820_register_active_regions(int nid, unsigned long start_pfn,
|
|
unsigned long last_pfn)
|
|
{
|
|
unsigned long ei_startpfn;
|
|
unsigned long ei_endpfn;
|
|
int i;
|
|
|
|
for (i = 0; i < e820.nr_map; i++)
|
|
if (e820_find_active_region(&e820.map[i],
|
|
start_pfn, last_pfn,
|
|
&ei_startpfn, &ei_endpfn))
|
|
add_active_range(nid, ei_startpfn, ei_endpfn);
|
|
}
|
|
|
|
/*
|
|
* Find the hole size (in bytes) in the memory range.
|
|
* @start: starting address of the memory range to scan
|
|
* @end: ending address of the memory range to scan
|
|
*/
|
|
u64 __init e820_hole_size(u64 start, u64 end)
|
|
{
|
|
unsigned long start_pfn = start >> PAGE_SHIFT;
|
|
unsigned long last_pfn = end >> PAGE_SHIFT;
|
|
unsigned long ei_startpfn, ei_endpfn, ram = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < e820.nr_map; i++) {
|
|
if (e820_find_active_region(&e820.map[i],
|
|
start_pfn, last_pfn,
|
|
&ei_startpfn, &ei_endpfn))
|
|
ram += ei_endpfn - ei_startpfn;
|
|
}
|
|
return end - start - ((u64)ram << PAGE_SHIFT);
|
|
}
|