cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mem.c (1631B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
      4 */
      5#include <linux/efi.h>
      6#include <linux/initrd.h>
      7#include <linux/memblock.h>
      8
      9#include <asm/bootinfo.h>
     10#include <asm/loongson.h>
     11#include <asm/sections.h>
     12
     13void __init memblock_init(void)
     14{
     15	u32 mem_type;
     16	u64 mem_start, mem_end, mem_size;
     17	efi_memory_desc_t *md;
     18
     19	/* Parse memory information */
     20	for_each_efi_memory_desc(md) {
     21		mem_type = md->type;
     22		mem_start = md->phys_addr;
     23		mem_size = md->num_pages << EFI_PAGE_SHIFT;
     24		mem_end = mem_start + mem_size;
     25
     26		switch (mem_type) {
     27		case EFI_LOADER_CODE:
     28		case EFI_LOADER_DATA:
     29		case EFI_BOOT_SERVICES_CODE:
     30		case EFI_BOOT_SERVICES_DATA:
     31		case EFI_PERSISTENT_MEMORY:
     32		case EFI_CONVENTIONAL_MEMORY:
     33			memblock_add(mem_start, mem_size);
     34			if (max_low_pfn < (mem_end >> PAGE_SHIFT))
     35				max_low_pfn = mem_end >> PAGE_SHIFT;
     36			break;
     37		case EFI_PAL_CODE:
     38		case EFI_UNUSABLE_MEMORY:
     39		case EFI_ACPI_RECLAIM_MEMORY:
     40			memblock_add(mem_start, mem_size);
     41			fallthrough;
     42		case EFI_RESERVED_TYPE:
     43		case EFI_RUNTIME_SERVICES_CODE:
     44		case EFI_RUNTIME_SERVICES_DATA:
     45		case EFI_MEMORY_MAPPED_IO:
     46		case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
     47			memblock_reserve(mem_start, mem_size);
     48			break;
     49		}
     50	}
     51
     52	memblock_set_current_limit(PFN_PHYS(max_low_pfn));
     53	memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
     54
     55	/* Reserve the first 2MB */
     56	memblock_reserve(PHYS_OFFSET, 0x200000);
     57
     58	/* Reserve the kernel text/data/bss */
     59	memblock_reserve(__pa_symbol(&_text),
     60			 __pa_symbol(&_end) - __pa_symbol(&_text));
     61
     62	/* Reserve the initrd */
     63	reserve_initrd_mem();
     64}