| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #if ENV_X86 |
| #include <cpu/x86/pae.h> |
| #else |
| #define memset_pae(a, b, c, d, e) 0 |
| #define MEMSET_PAE_PGTL_ALIGN 0 |
| #define MEMSET_PAE_PGTL_SIZE 0 |
| #define MEMSET_PAE_PGTL_SIZE 0 |
| #define MEMSET_PAE_VMEM_ALIGN 0 |
| #endif |
| |
| #include <memrange.h> |
| #include <bootmem.h> |
| #include <bootstate.h> |
| #include <symbols.h> |
| #include <console/console.h> |
| #include <arch/memory_clear.h> |
| #include <string.h> |
| #include <security/memory/memory.h> |
| #include <cbmem.h> |
| #include <acpi/acpi.h> |
| |
| /* Helper to find free space for memset_pae. */ |
| static uintptr_t get_free_memory_range(struct memranges *mem, |
| const resource_t align, |
| const resource_t size) |
| { |
| const struct range_entry *r; |
| |
| /* Find a spot for virtual memory address */ |
| memranges_each_entry(r, mem) { |
| if (range_entry_tag(r) != BM_MEM_RAM) |
| continue; |
| |
| if (ALIGN_UP(range_entry_base(r) + size, align) + size > |
| range_entry_end(r)) |
| continue; |
| |
| return ALIGN_UP(range_entry_base(r) + size, align); |
| } |
| printk(BIOS_ERR, "%s: Couldn't find free memory range\n", __func__); |
| |
| return 0; |
| } |
| |
| /* |
| * Clears all memory regions marked as BM_MEM_RAM. |
| * Uses memset_pae if the memory region can't be accessed by memset and |
| * architecture is x86. |
| * |
| * @return 0 on success, 1 on error |
| */ |
| static void clear_memory(void *unused) |
| { |
| const struct range_entry *r; |
| struct memranges mem; |
| uintptr_t pgtbl, vmem_addr; |
| |
| if (acpi_is_wakeup_s3()) |
| return; |
| |
| if (!security_clear_dram_request()) |
| return; |
| |
| /* FSP1.0 is marked as MMIO and won't appear here */ |
| |
| memranges_init(&mem, IORESOURCE_MEM | IORESOURCE_FIXED | |
| IORESOURCE_STORED | IORESOURCE_ASSIGNED | |
| IORESOURCE_CACHEABLE, |
| IORESOURCE_MEM | IORESOURCE_FIXED | |
| IORESOURCE_STORED | IORESOURCE_ASSIGNED | |
| IORESOURCE_CACHEABLE, |
| BM_MEM_RAM); |
| |
| /* Add reserved entries */ |
| void *baseptr = NULL; |
| size_t size = 0; |
| |
| /* Only skip CBMEM, stage program, stack and heap are included there. */ |
| |
| cbmem_get_region(&baseptr, &size); |
| memranges_insert(&mem, (uintptr_t)baseptr, size, BM_MEM_TABLE); |
| |
| if (ENV_X86) { |
| /* Find space for PAE enabled memset */ |
| pgtbl = get_free_memory_range(&mem, MEMSET_PAE_PGTL_ALIGN, |
| MEMSET_PAE_PGTL_SIZE); |
| |
| /* Don't touch page tables while clearing */ |
| memranges_insert(&mem, pgtbl, MEMSET_PAE_PGTL_SIZE, |
| BM_MEM_TABLE); |
| |
| vmem_addr = get_free_memory_range(&mem, MEMSET_PAE_VMEM_ALIGN, |
| MEMSET_PAE_PGTL_SIZE); |
| |
| printk(BIOS_SPEW, "%s: pgtbl at %p, virt memory at %p\n", |
| __func__, (void *)pgtbl, (void *)vmem_addr); |
| } |
| |
| /* Now clear all usable DRAM */ |
| memranges_each_entry(r, &mem) { |
| if (range_entry_tag(r) != BM_MEM_RAM) |
| continue; |
| printk(BIOS_DEBUG, "%s: Clearing DRAM %016llx-%016llx\n", |
| __func__, range_entry_base(r), range_entry_end(r)); |
| |
| /* Does regular memset work? */ |
| if (sizeof(resource_t) == sizeof(void *) || |
| !(range_entry_end(r) >> (sizeof(void *) * 8))) { |
| /* fastpath */ |
| memset((void *)(uintptr_t)range_entry_base(r), 0, |
| range_entry_size(r)); |
| } |
| /* Use PAE if available */ |
| else if (ENV_X86) { |
| if (memset_pae(range_entry_base(r), 0, |
| range_entry_size(r), (void *)pgtbl, |
| (void *)vmem_addr)) |
| printk(BIOS_ERR, "%s: Failed to memset " |
| "memory\n", __func__); |
| } else { |
| printk(BIOS_ERR, "%s: Failed to memset memory\n", |
| __func__); |
| } |
| } |
| |
| if (ENV_X86) { |
| /* Clear previously skipped memory reserved for pagetables */ |
| printk(BIOS_DEBUG, "%s: Clearing DRAM %016lx-%016lx\n", |
| __func__, pgtbl, pgtbl + MEMSET_PAE_PGTL_SIZE); |
| |
| memset((void *)pgtbl, 0, MEMSET_PAE_PGTL_SIZE); |
| } |
| |
| memranges_teardown(&mem); |
| } |
| |
| /* After DEV_INIT as MTRRs needs to be configured on x86 */ |
| BOOT_STATE_INIT_ENTRY(BS_DEV_INIT, BS_ON_EXIT, clear_memory, NULL); |