mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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ab4a465e96
since we now have 32-bit support for e820_register_active_regions(), we can merge the parsing of the mem=/memmap= boot parameters. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
117 lines
3.0 KiB
C
117 lines
3.0 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/pci.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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/*
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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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* 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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static void early_panic(char *msg)
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{
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early_printk(msg);
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panic(msg);
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}
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/* We're not void only for x86 32-bit compat */
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char *__init machine_specific_memory_setup(void)
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{
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char *who = "BIOS-e820";
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int new_nr;
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/*
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* Try to copy the BIOS-supplied E820-map.
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*
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* Otherwise fake a memory map; one section from 0k->640k,
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* the next section from 1mb->appropriate_mem_k
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*/
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new_nr = boot_params.e820_entries;
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sanitize_e820_map(boot_params.e820_map,
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ARRAY_SIZE(boot_params.e820_map),
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&new_nr);
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boot_params.e820_entries = new_nr;
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if (copy_e820_map(boot_params.e820_map, boot_params.e820_entries) < 0)
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early_panic("Cannot find a valid memory map");
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printk(KERN_INFO "BIOS-provided physical RAM map:\n");
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e820_print_map(who);
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/* In case someone cares... */
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return who;
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}
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int __init arch_get_ram_range(int slot, u64 *addr, u64 *size)
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{
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int i;
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if (slot < 0 || slot >= e820.nr_map)
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return -1;
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for (i = slot; i < e820.nr_map; i++) {
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if (e820.map[i].type != E820_RAM)
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continue;
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break;
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}
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if (i == e820.nr_map || e820.map[i].addr > (max_pfn << PAGE_SHIFT))
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return -1;
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*addr = e820.map[i].addr;
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*size = min_t(u64, e820.map[i].size + e820.map[i].addr,
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max_pfn << PAGE_SHIFT) - *addr;
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return i + 1;
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}
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