/* SPDX-License-Identifier: GPL-2.0-only */ #include <cpu/x86/post_code.h> #include <cpu/x86/64bit/entry64.inc> #define CBFS_FILE_MAGIC 0 #define CBFS_FILE_LEN (CBFS_FILE_MAGIC + 8) #define CBFS_FILE_TYPE (CBFS_FILE_LEN + 4) #define CBFS_FILE_CHECKSUM (CBFS_FILE_TYPE + 4) #define CBFS_FILE_OFFSET (CBFS_FILE_CHECKSUM + 4) .section .init, "ax", @progbits .code32 .global bootblock_pre_c_entry bootblock_pre_c_entry: cache_as_ram: post_code(POSTCODE_BOOTBLOCK_CAR) /* * Nothing to do here on qemu, RAM works just fine without any * initialization. */ /* Clear the cache memory region. This will also clear CAR GLOBAL */ movl $_car_region_start, %edi movl $_car_region_end, %ecx sub %edi, %ecx shr $2, %ecx xorl %eax, %eax rep stosl #if defined(__x86_64__) /* * Copy page tables to final location in DRAM. This prevents some strange * bugs when running KVM enabled: * Accessing MMX instructions in long mode causes an abort * Some physical addresses aren't properly translated * Emulation fault on every instruction fetched due to page tables in ROM * Enabling or disabling paging causes a fault * * First, find page tables in CBFS: */ lea pagetables_name, %esi mov $1f, %esp jmp walkcbfs_asm 1: cmpl $0, %eax je .Lhlt /* Test if page tables are memory-mapped and skip relocation */ cmpl $(CONFIG_ARCH_X86_64_PGTBL_LOC), %eax je pages_done movl CBFS_FILE_OFFSET(%eax), %ebx bswap %ebx addl %eax, %ebx movl %ebx, %esi movl CBFS_FILE_LEN(%eax), %ecx bswap %ecx shr $2, %ecx movl $(CONFIG_ARCH_X86_64_PGTBL_LOC), %edi loop: movl (%esi), %eax movl %eax, (%edi) addl $4, %esi addl $4, %edi decl %ecx jnz loop pages_done: #endif movl $_ecar_stack, %esp /* Align the stack and keep aligned for call to bootblock_c_entry() */ and $0xfffffff0, %esp #if ENV_X86_64 /* entry64.inc preserves ebx. */ setup_longmode $(CONFIG_ARCH_X86_64_PGTBL_LOC) /* Restore the BIST result and timestamps. */ movd %mm2, %rdi shlq $32, %rdi movd %mm1, %rsi or %rsi, %rdi movd %mm0, %rsi #else sub $4, %esp movd %mm0, %ebx movd %mm1, %eax movd %mm2, %edx pushl %ebx pushl %edx pushl %eax #endif /* Copy .data section content to Cache-As-Ram */ #include <cpu/x86/copy_data_section.inc> before_c_entry: call bootblock_c_entry_bist /* Never returns */ .Lhlt: post_code(POSTCODE_DEAD_CODE) hlt jmp .Lhlt pagetables_name: .string "pagetables"