952 lines
24 KiB
C
952 lines
24 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/suspend.h>
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#include <linux/pfn.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/sections.h>
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#include <asm/kdebug.h>
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#include <asm/trampoline.h>
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struct e820map e820;
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/*
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* PFN of last memory page.
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*/
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unsigned long end_pfn;
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/*
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* end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
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* The direct mapping extends to max_pfn_mapped, so that we can directly access
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* apertures, ACPI and other tables without having to play with fixmaps.
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*/
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unsigned long max_pfn_mapped;
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/*
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* Last pfn which the user wants to use.
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*/
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static unsigned long __initdata end_user_pfn = MAXMEM>>PAGE_SHIFT;
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/*
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* Early reserved memory areas.
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*/
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#define MAX_EARLY_RES 20
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struct early_res {
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unsigned long start, end;
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char name[16];
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};
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static struct early_res early_res[MAX_EARLY_RES] __initdata = {
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{ 0, PAGE_SIZE, "BIOS data page" }, /* BIOS data page */
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#ifdef CONFIG_X86_TRAMPOLINE
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{ TRAMPOLINE_BASE, TRAMPOLINE_BASE + 2 * PAGE_SIZE, "TRAMPOLINE" },
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#endif
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{}
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};
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void __init reserve_early(unsigned long start, unsigned long end, char *name)
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{
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int i;
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struct early_res *r;
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for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
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r = &early_res[i];
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if (end > r->start && start < r->end)
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panic("Overlapping early reservations %lx-%lx %s to %lx-%lx %s\n",
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start, end - 1, name?name:"", r->start, r->end - 1, r->name);
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}
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if (i >= MAX_EARLY_RES)
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panic("Too many early reservations");
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r = &early_res[i];
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r->start = start;
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r->end = end;
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if (name)
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strncpy(r->name, name, sizeof(r->name) - 1);
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}
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void __init free_early(unsigned long start, unsigned long end)
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{
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struct early_res *r;
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int i, j;
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for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
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r = &early_res[i];
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if (start == r->start && end == r->end)
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break;
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}
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if (i >= MAX_EARLY_RES || !early_res[i].end)
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panic("free_early on not reserved area: %lx-%lx!", start, end);
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for (j = i + 1; j < MAX_EARLY_RES && early_res[j].end; j++)
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;
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memmove(&early_res[i], &early_res[i + 1],
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(j - 1 - i) * sizeof(struct early_res));
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early_res[j - 1].end = 0;
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}
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void __init early_res_to_bootmem(unsigned long start, unsigned long end)
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{
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int i;
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unsigned long final_start, final_end;
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for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
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struct early_res *r = &early_res[i];
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final_start = max(start, r->start);
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final_end = min(end, r->end);
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if (final_start >= final_end)
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continue;
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printk(KERN_INFO " early res: %d [%lx-%lx] %s\n", i,
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final_start, final_end - 1, r->name);
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reserve_bootmem_generic(final_start, final_end - final_start);
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}
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}
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/* Check for already reserved areas */
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static inline int __init
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bad_addr(unsigned long *addrp, unsigned long size, unsigned long align)
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{
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int i;
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unsigned long addr = *addrp, last;
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int changed = 0;
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again:
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last = addr + size;
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for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
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struct early_res *r = &early_res[i];
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if (last >= r->start && addr < r->end) {
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*addrp = addr = round_up(r->end, align);
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changed = 1;
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goto again;
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}
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}
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return changed;
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}
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/* Check for already reserved areas */
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static inline int __init
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bad_addr_size(unsigned long *addrp, unsigned long *sizep, unsigned long align)
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{
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int i;
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unsigned long addr = *addrp, last;
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unsigned long size = *sizep;
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int changed = 0;
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again:
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last = addr + size;
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for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
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struct early_res *r = &early_res[i];
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if (last > r->start && addr < r->start) {
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size = r->start - addr;
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changed = 1;
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goto again;
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}
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if (last > r->end && addr < r->end) {
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addr = round_up(r->end, align);
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size = last - addr;
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changed = 1;
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goto again;
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}
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if (last <= r->end && addr >= r->start) {
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(*sizep)++;
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return 0;
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}
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}
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if (changed) {
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*addrp = addr;
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*sizep = size;
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}
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return changed;
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}
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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(unsigned long start, unsigned long 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(unsigned long start, unsigned long end,
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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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* Find a free area with specified alignment in a specific range.
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*/
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unsigned long __init find_e820_area(unsigned long start, unsigned long end,
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unsigned long size, unsigned long align)
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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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unsigned long addr, last;
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unsigned long ei_last;
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if (ei->type != E820_RAM)
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continue;
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addr = round_up(ei->addr, align);
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ei_last = ei->addr + ei->size;
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if (addr < start)
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addr = round_up(start, align);
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if (addr >= ei_last)
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continue;
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while (bad_addr(&addr, size, align) && addr+size <= ei_last)
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;
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last = addr + size;
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if (last > ei_last)
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continue;
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if (last > end)
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continue;
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return addr;
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}
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return -1UL;
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}
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/*
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* Find next free range after *start
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*/
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unsigned long __init find_e820_area_size(unsigned long start,
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unsigned long *sizep,
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unsigned long align)
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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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unsigned long addr, last;
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unsigned long ei_last;
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if (ei->type != E820_RAM)
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continue;
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addr = round_up(ei->addr, align);
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ei_last = ei->addr + ei->size;
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if (addr < start)
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addr = round_up(start, align);
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if (addr >= ei_last)
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continue;
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*sizep = ei_last - addr;
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while (bad_addr_size(&addr, sizep, align) &&
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addr + *sizep <= ei_last)
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;
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last = addr + *sizep;
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if (last > ei_last)
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continue;
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return addr;
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}
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return -1UL;
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}
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/*
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* Find the highest page frame number we have available
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*/
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unsigned long __init e820_end_of_ram(void)
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{
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unsigned long end_pfn;
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end_pfn = find_max_pfn_with_active_regions();
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if (end_pfn > max_pfn_mapped)
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max_pfn_mapped = end_pfn;
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if (max_pfn_mapped > MAXMEM>>PAGE_SHIFT)
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max_pfn_mapped = MAXMEM>>PAGE_SHIFT;
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if (end_pfn > end_user_pfn)
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end_pfn = end_user_pfn;
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if (end_pfn > max_pfn_mapped)
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end_pfn = max_pfn_mapped;
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printk(KERN_INFO "max_pfn_mapped = %lu\n", max_pfn_mapped);
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return end_pfn;
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}
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/*
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* Mark e820 reserved areas as busy for the resource manager.
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*/
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void __init e820_reserve_resources(void)
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{
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int i;
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struct resource *res;
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res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
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for (i = 0; i < e820.nr_map; i++) {
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switch (e820.map[i].type) {
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case E820_RAM: res->name = "System RAM"; break;
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case E820_ACPI: res->name = "ACPI Tables"; break;
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case E820_NVS: res->name = "ACPI Non-volatile Storage"; break;
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default: res->name = "reserved";
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}
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res->start = e820.map[i].addr;
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res->end = res->start + e820.map[i].size - 1;
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res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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insert_resource(&iomem_resource, res);
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res++;
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}
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}
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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 software
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* suspend and suspend to RAM.
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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(void)
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{
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int i;
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unsigned long paddr;
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paddr = round_down(e820.map[0].addr + e820.map[0].size, PAGE_SIZE);
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for (i = 1; i < e820.nr_map; i++) {
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struct e820entry *ei = &e820.map[i];
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if (paddr < ei->addr)
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register_nosave_region(PFN_DOWN(paddr),
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PFN_UP(ei->addr));
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paddr = round_down(ei->addr + ei->size, PAGE_SIZE);
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if (ei->type != E820_RAM)
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register_nosave_region(PFN_UP(ei->addr),
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PFN_DOWN(paddr));
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if (paddr >= (end_pfn << PAGE_SHIFT))
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break;
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}
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}
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/*
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* Finds an active region in the address range from start_pfn to end_pfn and
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* returns its range in ei_startpfn and ei_endpfn for the e820 entry.
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*/
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static int __init e820_find_active_region(const struct e820entry *ei,
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unsigned long start_pfn,
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unsigned long end_pfn,
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unsigned long *ei_startpfn,
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unsigned long *ei_endpfn)
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{
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*ei_startpfn = round_up(ei->addr, PAGE_SIZE) >> PAGE_SHIFT;
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*ei_endpfn = round_down(ei->addr + ei->size, PAGE_SIZE) >> PAGE_SHIFT;
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/* Skip map entries smaller than a page */
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if (*ei_startpfn >= *ei_endpfn)
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return 0;
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/* Check if max_pfn_mapped should be updated */
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if (ei->type != E820_RAM && *ei_endpfn > max_pfn_mapped)
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max_pfn_mapped = *ei_endpfn;
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/* Skip if map is outside the node */
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if (ei->type != E820_RAM || *ei_endpfn <= start_pfn ||
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*ei_startpfn >= end_pfn)
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return 0;
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/* Check for overlaps */
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if (*ei_startpfn < start_pfn)
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*ei_startpfn = start_pfn;
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if (*ei_endpfn > end_pfn)
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*ei_endpfn = end_pfn;
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/* Obey end_user_pfn to save on memmap */
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if (*ei_startpfn >= end_user_pfn)
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return 0;
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if (*ei_endpfn > end_user_pfn)
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*ei_endpfn = end_user_pfn;
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return 1;
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}
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/* Walk the e820 map and register active regions within a node */
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void __init
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e820_register_active_regions(int nid, unsigned long start_pfn,
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unsigned long end_pfn)
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{
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unsigned long ei_startpfn;
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unsigned long ei_endpfn;
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int i;
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for (i = 0; i < e820.nr_map; i++)
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if (e820_find_active_region(&e820.map[i],
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start_pfn, end_pfn,
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&ei_startpfn, &ei_endpfn))
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add_active_range(nid, ei_startpfn, ei_endpfn);
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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(unsigned long start, unsigned long size, int type)
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{
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int x = e820.nr_map;
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if (x == E820MAX) {
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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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/*
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* Find the hole size (in bytes) in the memory range.
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* @start: starting address of the memory range to scan
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* @end: ending address of the memory range to scan
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*/
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unsigned long __init e820_hole_size(unsigned long start, unsigned long end)
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{
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unsigned long start_pfn = start >> PAGE_SHIFT;
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unsigned long end_pfn = end >> PAGE_SHIFT;
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unsigned long ei_startpfn, ei_endpfn, ram = 0;
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int i;
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for (i = 0; i < e820.nr_map; i++) {
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if (e820_find_active_region(&e820.map[i],
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start_pfn, end_pfn,
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&ei_startpfn, &ei_endpfn))
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ram += ei_endpfn - ei_startpfn;
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}
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return end - start - (ram << PAGE_SHIFT);
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}
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static 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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*
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*/
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static int __init sanitize_e820_map(struct e820entry *biosmap, char *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*E820MAX] __initdata;
|
|
static struct change_member *change_point[2*E820MAX] __initdata;
|
|
static struct e820entry *overlap_list[E820MAX] __initdata;
|
|
static struct e820entry new_bios[E820MAX] __initdata;
|
|
struct change_member *change_tmp;
|
|
unsigned long current_type, last_type;
|
|
unsigned long long last_addr;
|
|
int chgidx, still_changing;
|
|
int overlap_entries;
|
|
int new_bios_entry;
|
|
int old_nr, new_nr, chg_nr;
|
|
int i;
|
|
|
|
/*
|
|
Visually we're performing the following
|
|
(1,2,3,4 = memory types)...
|
|
|
|
Sample memory map (w/overlaps):
|
|
____22__________________
|
|
______________________4_
|
|
____1111________________
|
|
_44_____________________
|
|
11111111________________
|
|
____________________33__
|
|
___________44___________
|
|
__________33333_________
|
|
______________22________
|
|
___________________2222_
|
|
_________111111111______
|
|
_____________________11_
|
|
_________________4______
|
|
|
|
Sanitized equivalent (no overlap):
|
|
1_______________________
|
|
_44_____________________
|
|
___1____________________
|
|
____22__________________
|
|
______11________________
|
|
_________1______________
|
|
__________3_____________
|
|
___________44___________
|
|
_____________33_________
|
|
_______________2________
|
|
________________1_______
|
|
_________________4______
|
|
___________________2____
|
|
____________________33__
|
|
______________________4_
|
|
*/
|
|
|
|
/* if there's only one memory region, don't bother */
|
|
if (*pnr_map < 2)
|
|
return -1;
|
|
|
|
old_nr = *pnr_map;
|
|
|
|
/* bail out if we find any unreasonable addresses in bios map */
|
|
for (i = 0; i < old_nr; i++)
|
|
if (biosmap[i].addr + biosmap[i].size < biosmap[i].addr)
|
|
return -1;
|
|
|
|
/* create pointers for initial change-point information (for sorting) */
|
|
for (i = 0; i < 2 * old_nr; i++)
|
|
change_point[i] = &change_point_list[i];
|
|
|
|
/* record all known change-points (starting and ending addresses),
|
|
omitting those that are for empty memory regions */
|
|
chgidx = 0;
|
|
for (i = 0; i < old_nr; i++) {
|
|
if (biosmap[i].size != 0) {
|
|
change_point[chgidx]->addr = biosmap[i].addr;
|
|
change_point[chgidx++]->pbios = &biosmap[i];
|
|
change_point[chgidx]->addr = biosmap[i].addr +
|
|
biosmap[i].size;
|
|
change_point[chgidx++]->pbios = &biosmap[i];
|
|
}
|
|
}
|
|
chg_nr = chgidx;
|
|
|
|
/* sort change-point list by memory addresses (low -> high) */
|
|
still_changing = 1;
|
|
while (still_changing) {
|
|
still_changing = 0;
|
|
for (i = 1; i < chg_nr; i++) {
|
|
unsigned long long curaddr, lastaddr;
|
|
unsigned long long curpbaddr, lastpbaddr;
|
|
|
|
curaddr = change_point[i]->addr;
|
|
lastaddr = change_point[i - 1]->addr;
|
|
curpbaddr = change_point[i]->pbios->addr;
|
|
lastpbaddr = change_point[i - 1]->pbios->addr;
|
|
|
|
/*
|
|
* swap entries, when:
|
|
*
|
|
* curaddr > lastaddr or
|
|
* curaddr == lastaddr and curaddr == curpbaddr and
|
|
* lastaddr != lastpbaddr
|
|
*/
|
|
if (curaddr < lastaddr ||
|
|
(curaddr == lastaddr && curaddr == curpbaddr &&
|
|
lastaddr != lastpbaddr)) {
|
|
change_tmp = change_point[i];
|
|
change_point[i] = change_point[i-1];
|
|
change_point[i-1] = change_tmp;
|
|
still_changing = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* create a new bios memory map, removing overlaps */
|
|
overlap_entries = 0; /* number of entries in the overlap table */
|
|
new_bios_entry = 0; /* index for creating new bios map entries */
|
|
last_type = 0; /* start with undefined memory type */
|
|
last_addr = 0; /* start with 0 as last starting address */
|
|
|
|
/* loop through change-points, determining affect on the new bios map */
|
|
for (chgidx = 0; chgidx < chg_nr; chgidx++) {
|
|
/* keep track of all overlapping bios entries */
|
|
if (change_point[chgidx]->addr ==
|
|
change_point[chgidx]->pbios->addr) {
|
|
/*
|
|
* add map entry to overlap list (> 1 entry
|
|
* implies an overlap)
|
|
*/
|
|
overlap_list[overlap_entries++] =
|
|
change_point[chgidx]->pbios;
|
|
} else {
|
|
/*
|
|
* remove entry from list (order independent,
|
|
* so swap with last)
|
|
*/
|
|
for (i = 0; i < overlap_entries; i++) {
|
|
if (overlap_list[i] ==
|
|
change_point[chgidx]->pbios)
|
|
overlap_list[i] =
|
|
overlap_list[overlap_entries-1];
|
|
}
|
|
overlap_entries--;
|
|
}
|
|
/*
|
|
* if there are overlapping entries, decide which
|
|
* "type" to use (larger value takes precedence --
|
|
* 1=usable, 2,3,4,4+=unusable)
|
|
*/
|
|
current_type = 0;
|
|
for (i = 0; i < overlap_entries; i++)
|
|
if (overlap_list[i]->type > current_type)
|
|
current_type = overlap_list[i]->type;
|
|
/*
|
|
* continue building up new bios map based on this
|
|
* information
|
|
*/
|
|
if (current_type != last_type) {
|
|
if (last_type != 0) {
|
|
new_bios[new_bios_entry].size =
|
|
change_point[chgidx]->addr - last_addr;
|
|
/*
|
|
* move forward only if the new size
|
|
* was non-zero
|
|
*/
|
|
if (new_bios[new_bios_entry].size != 0)
|
|
/*
|
|
* no more space left for new
|
|
* bios entries ?
|
|
*/
|
|
if (++new_bios_entry >= E820MAX)
|
|
break;
|
|
}
|
|
if (current_type != 0) {
|
|
new_bios[new_bios_entry].addr =
|
|
change_point[chgidx]->addr;
|
|
new_bios[new_bios_entry].type = current_type;
|
|
last_addr = change_point[chgidx]->addr;
|
|
}
|
|
last_type = current_type;
|
|
}
|
|
}
|
|
/* retain count for new bios entries */
|
|
new_nr = new_bios_entry;
|
|
|
|
/* copy new bios mapping into original location */
|
|
memcpy(biosmap, new_bios, new_nr * sizeof(struct e820entry));
|
|
*pnr_map = new_nr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Copy the BIOS e820 map into a safe place.
|
|
*
|
|
* Sanity-check it while we're at it..
|
|
*
|
|
* If we're lucky and live on a modern system, the setup code
|
|
* will have given us a memory map that we can use to properly
|
|
* set up memory. If we aren't, we'll fake a memory map.
|
|
*/
|
|
static int __init copy_e820_map(struct e820entry *biosmap, int nr_map)
|
|
{
|
|
/* Only one memory region (or negative)? Ignore it */
|
|
if (nr_map < 2)
|
|
return -1;
|
|
|
|
do {
|
|
u64 start = biosmap->addr;
|
|
u64 size = biosmap->size;
|
|
u64 end = start + size;
|
|
u32 type = biosmap->type;
|
|
|
|
/* Overflow in 64 bits? Ignore the memory map. */
|
|
if (start > end)
|
|
return -1;
|
|
|
|
add_memory_region(start, size, type);
|
|
} while (biosmap++, --nr_map);
|
|
return 0;
|
|
}
|
|
|
|
static void early_panic(char *msg)
|
|
{
|
|
early_printk(msg);
|
|
panic(msg);
|
|
}
|
|
|
|
/* We're not void only for x86 32-bit compat */
|
|
char * __init machine_specific_memory_setup(void)
|
|
{
|
|
char *who = "BIOS-e820";
|
|
/*
|
|
* Try to copy the BIOS-supplied E820-map.
|
|
*
|
|
* Otherwise fake a memory map; one section from 0k->640k,
|
|
* the next section from 1mb->appropriate_mem_k
|
|
*/
|
|
sanitize_e820_map(boot_params.e820_map, &boot_params.e820_entries);
|
|
if (copy_e820_map(boot_params.e820_map, boot_params.e820_entries) < 0)
|
|
early_panic("Cannot find a valid memory map");
|
|
printk(KERN_INFO "BIOS-provided physical RAM map:\n");
|
|
e820_print_map(who);
|
|
|
|
/* In case someone cares... */
|
|
return who;
|
|
}
|
|
|
|
static int __init parse_memopt(char *p)
|
|
{
|
|
if (!p)
|
|
return -EINVAL;
|
|
end_user_pfn = memparse(p, &p);
|
|
end_user_pfn >>= PAGE_SHIFT;
|
|
return 0;
|
|
}
|
|
early_param("mem", parse_memopt);
|
|
|
|
static int userdef __initdata;
|
|
|
|
static int __init parse_memmap_opt(char *p)
|
|
{
|
|
char *oldp;
|
|
unsigned long long start_at, mem_size;
|
|
|
|
if (!strcmp(p, "exactmap")) {
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
/*
|
|
* If we are doing a crash dump, we still need to know
|
|
* the real mem size before original memory map is
|
|
* reset.
|
|
*/
|
|
e820_register_active_regions(0, 0, -1UL);
|
|
saved_max_pfn = e820_end_of_ram();
|
|
remove_all_active_ranges();
|
|
#endif
|
|
max_pfn_mapped = 0;
|
|
e820.nr_map = 0;
|
|
userdef = 1;
|
|
return 0;
|
|
}
|
|
|
|
oldp = p;
|
|
mem_size = memparse(p, &p);
|
|
if (p == oldp)
|
|
return -EINVAL;
|
|
|
|
userdef = 1;
|
|
if (*p == '@') {
|
|
start_at = memparse(p+1, &p);
|
|
add_memory_region(start_at, mem_size, E820_RAM);
|
|
} else if (*p == '#') {
|
|
start_at = memparse(p+1, &p);
|
|
add_memory_region(start_at, mem_size, E820_ACPI);
|
|
} else if (*p == '$') {
|
|
start_at = memparse(p+1, &p);
|
|
add_memory_region(start_at, mem_size, E820_RESERVED);
|
|
} else {
|
|
end_user_pfn = (mem_size >> PAGE_SHIFT);
|
|
}
|
|
return *p == '\0' ? 0 : -EINVAL;
|
|
}
|
|
early_param("memmap", parse_memmap_opt);
|
|
|
|
void __init finish_e820_parsing(void)
|
|
{
|
|
if (userdef) {
|
|
char nr = e820.nr_map;
|
|
|
|
if (sanitize_e820_map(e820.map, &nr) < 0)
|
|
early_panic("Invalid user supplied memory map");
|
|
e820.nr_map = nr;
|
|
|
|
printk(KERN_INFO "user-defined physical RAM map:\n");
|
|
e820_print_map("user");
|
|
}
|
|
}
|
|
|
|
void __init update_memory_range(u64 start, u64 size, unsigned old_type,
|
|
unsigned new_type)
|
|
{
|
|
int i;
|
|
|
|
BUG_ON(old_type == new_type);
|
|
|
|
for (i = 0; i < e820.nr_map; i++) {
|
|
struct e820entry *ei = &e820.map[i];
|
|
u64 final_start, final_end;
|
|
if (ei->type != old_type)
|
|
continue;
|
|
/* totally covered? */
|
|
if (ei->addr >= start && ei->size <= size) {
|
|
ei->type = new_type;
|
|
continue;
|
|
}
|
|
/* partially covered */
|
|
final_start = max(start, ei->addr);
|
|
final_end = min(start + size, ei->addr + ei->size);
|
|
if (final_start >= final_end)
|
|
continue;
|
|
add_memory_region(final_start, final_end - final_start,
|
|
new_type);
|
|
}
|
|
}
|
|
|
|
void __init update_e820(void)
|
|
{
|
|
u8 nr_map;
|
|
|
|
nr_map = e820.nr_map;
|
|
if (sanitize_e820_map(e820.map, &nr_map))
|
|
return;
|
|
e820.nr_map = nr_map;
|
|
printk(KERN_INFO "modified physical RAM map:\n");
|
|
e820_print_map("modified");
|
|
}
|
|
|
|
unsigned long pci_mem_start = 0xaeedbabe;
|
|
EXPORT_SYMBOL(pci_mem_start);
|
|
|
|
/*
|
|
* Search for the biggest gap in the low 32 bits of the e820
|
|
* memory space. We pass this space to PCI to assign MMIO resources
|
|
* for hotplug or unconfigured devices in.
|
|
* Hopefully the BIOS let enough space left.
|
|
*/
|
|
__init void e820_setup_gap(void)
|
|
{
|
|
unsigned long gapstart, gapsize, round;
|
|
unsigned long last;
|
|
int i;
|
|
int found = 0;
|
|
|
|
last = 0x100000000ull;
|
|
gapstart = 0x10000000;
|
|
gapsize = 0x400000;
|
|
i = e820.nr_map;
|
|
while (--i >= 0) {
|
|
unsigned long long start = e820.map[i].addr;
|
|
unsigned long long end = start + e820.map[i].size;
|
|
|
|
/*
|
|
* Since "last" is at most 4GB, we know we'll
|
|
* fit in 32 bits if this condition is true
|
|
*/
|
|
if (last > end) {
|
|
unsigned long gap = last - end;
|
|
|
|
if (gap > gapsize) {
|
|
gapsize = gap;
|
|
gapstart = end;
|
|
found = 1;
|
|
}
|
|
}
|
|
if (start < last)
|
|
last = start;
|
|
}
|
|
|
|
if (!found) {
|
|
gapstart = (end_pfn << PAGE_SHIFT) + 1024*1024;
|
|
printk(KERN_ERR "PCI: Warning: Cannot find a gap in the 32bit "
|
|
"address range\n"
|
|
KERN_ERR "PCI: Unassigned devices with 32bit resource "
|
|
"registers may break!\n");
|
|
}
|
|
|
|
/*
|
|
* See how much we want to round up: start off with
|
|
* rounding to the next 1MB area.
|
|
*/
|
|
round = 0x100000;
|
|
while ((gapsize >> 4) > round)
|
|
round += round;
|
|
/* Fun with two's complement */
|
|
pci_mem_start = (gapstart + round) & -round;
|
|
|
|
printk(KERN_INFO
|
|
"Allocating PCI resources starting at %lx (gap: %lx:%lx)\n",
|
|
pci_mem_start, gapstart, gapsize);
|
|
}
|
|
|
|
int __init arch_get_ram_range(int slot, u64 *addr, u64 *size)
|
|
{
|
|
int i;
|
|
|
|
if (slot < 0 || slot >= e820.nr_map)
|
|
return -1;
|
|
for (i = slot; i < e820.nr_map; i++) {
|
|
if (e820.map[i].type != E820_RAM)
|
|
continue;
|
|
break;
|
|
}
|
|
if (i == e820.nr_map || e820.map[i].addr > (max_pfn << PAGE_SHIFT))
|
|
return -1;
|
|
*addr = e820.map[i].addr;
|
|
*size = min_t(u64, e820.map[i].size + e820.map[i].addr,
|
|
max_pfn << PAGE_SHIFT) - *addr;
|
|
return i + 1;
|
|
}
|