| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <cpu/x86/post_code.h> |
| |
| #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(POST_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 |
| |
| post_code(0x21) |
| |
| #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 |
| |
| /* entry64.inc preserves ebx. */ |
| #include <cpu/x86/64bit/entry64.inc> |
| |
| /* Restore the BIST result and timestamps. */ |
| #if ENV_X86_64 |
| 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 |
| |
| before_c_entry: |
| call bootblock_c_entry_bist |
| /* Never returns */ |
| .Lhlt: |
| post_code(POST_DEAD_CODE) |
| hlt |
| jmp .Lhlt |
| |
| pagetables_name: |
| .string "pagetables" |
