2c8c0e6b8d
Instead of hackish manual parsing Requires earlier i386 patchkit, but also fixes i386 early_printk again. I removed some obsolete really early parameters which didn't do anything useful. Also made a few parameters that needed it early (mostly oops printing setup) Also removed one panic check that wasn't visible without early console anyways (the early console is now initialized after that panic) This cleans up a lot of code. Signed-off-by: Andi Kleen <ak@suse.de>
719 lines
19 KiB
C
719 lines
19 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 <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/bootsetup.h>
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#include <asm/sections.h>
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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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EXPORT_SYMBOL(end_pfn);
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/*
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* end_pfn only includes RAM, while end_pfn_map includes all e820 entries.
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* The direct mapping extends to end_pfn_map, 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 end_pfn_map;
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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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extern struct resource code_resource, data_resource;
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/* Check for some hardcoded bad areas that early boot is not allowed to touch */
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static inline int bad_addr(unsigned long *addrp, unsigned long size)
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{
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unsigned long addr = *addrp, last = addr + size;
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/* various gunk below that needed for SMP startup */
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if (addr < 0x8000) {
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*addrp = 0x8000;
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return 1;
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}
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/* direct mapping tables of the kernel */
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if (last >= table_start<<PAGE_SHIFT && addr < table_end<<PAGE_SHIFT) {
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*addrp = table_end << PAGE_SHIFT;
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return 1;
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}
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/* initrd */
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#ifdef CONFIG_BLK_DEV_INITRD
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if (LOADER_TYPE && INITRD_START && last >= INITRD_START &&
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addr < INITRD_START+INITRD_SIZE) {
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*addrp = INITRD_START + INITRD_SIZE;
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return 1;
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}
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#endif
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/* kernel code + 640k memory hole (later should not be needed, but
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be paranoid for now) */
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if (last >= 640*1024 && addr < 1024*1024) {
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*addrp = 1024*1024;
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return 1;
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}
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if (last >= __pa_symbol(&_text) && last < __pa_symbol(&_end)) {
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*addrp = __pa_symbol(&_end);
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return 1;
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}
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if (last >= ebda_addr && addr < ebda_addr + ebda_size) {
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*addrp = ebda_addr + ebda_size;
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return 1;
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}
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/* XXX ramdisk image here? */
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return 0;
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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 __meminit
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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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/*
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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, 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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/* if start is now at or beyond end, we're done, full coverage */
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if (start >= end)
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return 1; /* we're done */
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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 in a specific range.
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*/
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unsigned long __init find_e820_area(unsigned long start, unsigned long end, unsigned size)
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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 = ei->addr, last;
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if (ei->type != E820_RAM)
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continue;
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if (addr < start)
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addr = start;
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if (addr > ei->addr + ei->size)
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continue;
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while (bad_addr(&addr, size) && addr+size <= ei->addr+ei->size)
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;
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last = addr + size;
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if (last > ei->addr + ei->size)
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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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* Free bootmem based on the e820 table for a node.
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*/
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void __init e820_bootmem_free(pg_data_t *pgdat, unsigned long start,unsigned long end)
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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 last, addr;
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if (ei->type != E820_RAM ||
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ei->addr+ei->size <= start ||
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ei->addr >= end)
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continue;
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addr = round_up(ei->addr, PAGE_SIZE);
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if (addr < start)
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addr = start;
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last = round_down(ei->addr + ei->size, PAGE_SIZE);
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if (last >= end)
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last = end;
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if (last > addr && last-addr >= PAGE_SIZE)
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free_bootmem_node(pgdat, addr, last-addr);
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}
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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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int i;
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unsigned long end_pfn = 0;
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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 start, end;
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start = round_up(ei->addr, PAGE_SIZE);
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end = round_down(ei->addr + ei->size, PAGE_SIZE);
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if (start >= end)
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continue;
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if (ei->type == E820_RAM) {
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if (end > end_pfn<<PAGE_SHIFT)
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end_pfn = end>>PAGE_SHIFT;
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} else {
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if (end > end_pfn_map<<PAGE_SHIFT)
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end_pfn_map = end>>PAGE_SHIFT;
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}
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}
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if (end_pfn > end_pfn_map)
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end_pfn_map = end_pfn;
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if (end_pfn_map > MAXMEM>>PAGE_SHIFT)
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end_pfn_map = 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 > end_pfn_map)
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end_pfn = end_pfn_map;
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return end_pfn;
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}
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/*
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* Compute how much memory is missing in a range.
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* Unlike the other functions in this file the arguments are in page numbers.
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*/
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unsigned long __init
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e820_hole_size(unsigned long start_pfn, unsigned long end_pfn)
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{
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unsigned long ram = 0;
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unsigned long start = start_pfn << PAGE_SHIFT;
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unsigned long end = end_pfn << PAGE_SHIFT;
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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 last, addr;
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if (ei->type != E820_RAM ||
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ei->addr+ei->size <= start ||
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ei->addr >= end)
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continue;
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addr = round_up(ei->addr, PAGE_SIZE);
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if (addr < start)
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addr = start;
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last = round_down(ei->addr + ei->size, PAGE_SIZE);
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if (last >= end)
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last = end;
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if (last > addr)
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ram += last - addr;
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}
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return ((end - start) - ram) >> PAGE_SHIFT;
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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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for (i = 0; i < e820.nr_map; i++) {
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struct resource *res;
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res = alloc_bootmem_low(sizeof(struct resource));
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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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request_resource(&iomem_resource, res);
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if (e820.map[i].type == E820_RAM) {
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/*
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* We don't know which RAM region contains kernel data,
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* so we try it repeatedly and let the resource manager
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* test it.
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*/
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request_resource(res, &code_resource);
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request_resource(res, &data_resource);
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#ifdef CONFIG_KEXEC
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request_resource(res, &crashk_res);
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#endif
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}
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}
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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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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(" %s: %016Lx - %016Lx ", who,
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(unsigned long long) e820.map[i].addr,
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(unsigned long long) (e820.map[i].addr + e820.map[i].size));
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switch (e820.map[i].type) {
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case E820_RAM: printk("(usable)\n");
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break;
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case E820_RESERVED:
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printk("(reserved)\n");
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break;
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case E820_ACPI:
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printk("(ACPI data)\n");
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break;
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case E820_NVS:
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printk("(ACPI NVS)\n");
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break;
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default: printk("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;
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static struct change_member *change_point[2*E820MAX] __initdata;
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static struct e820entry *overlap_list[E820MAX] __initdata;
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static struct e820entry new_bios[E820MAX] __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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/*
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Visually we're performing the following (1,2,3,4 = memory types)...
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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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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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/* 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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/* 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 + 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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/* if <current_addr> > <last_addr>, swap */
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/* or, if current=<start_addr> & last=<end_addr>, swap */
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if ((change_point[i]->addr < change_point[i-1]->addr) ||
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((change_point[i]->addr == change_point[i-1]->addr) &&
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(change_point[i]->addr == change_point[i]->pbios->addr) &&
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(change_point[i-1]->addr != change_point[i-1]->pbios->addr))
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)
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{
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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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{
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/* keep track of all overlapping bios entries */
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if (change_point[chgidx]->addr == change_point[chgidx]->pbios->addr)
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{
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/* add map entry to overlap list (> 1 entry implies an overlap) */
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overlap_list[overlap_entries++]=change_point[chgidx]->pbios;
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}
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else
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{
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/* remove entry from list (order independent, so swap with last) */
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for (i=0; i<overlap_entries; i++)
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{
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if (overlap_list[i] == change_point[chgidx]->pbios)
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overlap_list[i] = overlap_list[overlap_entries-1];
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}
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overlap_entries--;
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}
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/* if there are overlapping entries, decide which "type" to use */
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/* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
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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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/* continue building up new bios map based on this information */
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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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/* move forward only if the new size was non-zero */
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if (new_bios[new_bios_entry].size != 0)
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if (++new_bios_entry >= E820MAX)
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break; /* no more space left for new bios entries */
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}
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if (current_type != 0) {
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new_bios[new_bios_entry].addr = 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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new_nr = new_bios_entry; /* retain count for new bios entries */
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|
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/* 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.
|
|
*
|
|
* We check to see that the memory map contains at least 2 elements
|
|
* before we'll use it, because the detection code in setup.S may
|
|
* not be perfect and most every PC known to man has two memory
|
|
* regions: one from 0 to 640k, and one from 1mb up. (The IBM
|
|
* thinkpad 560x, for example, does not cooperate with the memory
|
|
* detection code.)
|
|
*/
|
|
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 {
|
|
unsigned long start = biosmap->addr;
|
|
unsigned long size = biosmap->size;
|
|
unsigned long end = start + size;
|
|
unsigned long type = biosmap->type;
|
|
|
|
/* Overflow in 64 bits? Ignore the memory map. */
|
|
if (start > end)
|
|
return -1;
|
|
|
|
/*
|
|
* Some BIOSes claim RAM in the 640k - 1M region.
|
|
* Not right. Fix it up.
|
|
*
|
|
* This should be removed on Hammer which is supposed to not
|
|
* have non e820 covered ISA mappings there, but I had some strange
|
|
* problems so it stays for now. -AK
|
|
*/
|
|
if (type == E820_RAM) {
|
|
if (start < 0x100000ULL && end > 0xA0000ULL) {
|
|
if (start < 0xA0000ULL)
|
|
add_memory_region(start, 0xA0000ULL-start, type);
|
|
if (end <= 0x100000ULL)
|
|
continue;
|
|
start = 0x100000ULL;
|
|
size = end - start;
|
|
}
|
|
}
|
|
|
|
add_memory_region(start, size, type);
|
|
} while (biosmap++,--nr_map);
|
|
return 0;
|
|
}
|
|
|
|
void __init setup_memory_region(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(E820_MAP, &E820_MAP_NR);
|
|
if (copy_e820_map(E820_MAP, E820_MAP_NR) < 0) {
|
|
unsigned long mem_size;
|
|
|
|
/* compare results from other methods and take the greater */
|
|
if (ALT_MEM_K < EXT_MEM_K) {
|
|
mem_size = EXT_MEM_K;
|
|
who = "BIOS-88";
|
|
} else {
|
|
mem_size = ALT_MEM_K;
|
|
who = "BIOS-e801";
|
|
}
|
|
|
|
e820.nr_map = 0;
|
|
add_memory_region(0, LOWMEMSIZE(), E820_RAM);
|
|
add_memory_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
|
|
}
|
|
printk(KERN_INFO "BIOS-provided physical RAM map:\n");
|
|
e820_print_map(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.
|
|
*/
|
|
saved_max_pfn = e820_end_of_ram();
|
|
#endif
|
|
end_pfn_map = 0;
|
|
e820.nr_map = 0;
|
|
userdef = 1;
|
|
return 0;
|
|
}
|
|
|
|
oldp = p;
|
|
mem_size = memparse(p, &p);
|
|
if (p == oldp)
|
|
return -EINVAL;
|
|
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 finish_e820_parsing(void)
|
|
{
|
|
if (userdef) {
|
|
printk(KERN_INFO "user-defined physical RAM map:\n");
|
|
e820_print_map("user");
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|